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Merge branch 'master' into 'feature/kos-texture-stride'

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# Conflicts:
#   tests/test_glteximage2d.h
This commit is contained in:
Luke Benstead 2026-06-23 05:25:48 +00:00
commit cbc83deee0
23 changed files with 2028 additions and 85 deletions
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10
GL/private.h
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@ -16,6 +16,12 @@
#include "../containers/aligned_vector.h" #include "../containers/aligned_vector.h"
#include "../containers/named_array.h" #include "../containers/named_array.h"
#ifdef __cplusplus
/* Ensure the helper functions declared below keep C linkage when this header
* is pulled into the C++ test harness, so they link against the C library. */
extern "C" {
#endif
#define MAX_GLDC_4BPP_PALETTE_SLOTS 16 #define MAX_GLDC_4BPP_PALETTE_SLOTS 16
#define MAX_GLDC_PALETTE_SLOTS 4 #define MAX_GLDC_PALETTE_SLOTS 4
#define MAX_GLDC_SHARED_PALETTES (MAX_GLDC_PALETTE_SLOTS*MAX_GLDC_4BPP_PALETTE_SLOTS) #define MAX_GLDC_SHARED_PALETTES (MAX_GLDC_PALETTE_SLOTS*MAX_GLDC_4BPP_PALETTE_SLOTS)
@ -480,4 +486,8 @@ float _glUnpackHalfFloat(half_float_t h);
#define MAX(a,b) (((a)>(b))?(a):(b)) #define MAX(a,b) (((a)>(b))?(a):(b))
#define CLAMP( X, _MIN, _MAX ) ( (X)<(_MIN) ? (_MIN) : ((X)>(_MAX) ? (_MAX) : (X)) ) #define CLAMP( X, _MIN, _MAX ) ( (X)<(_MIN) ? (_MIN) : ((X)>(_MAX) ? (_MAX) : (X)) )
#ifdef __cplusplus
}
#endif
#endif // PRIVATE_H #endif // PRIVATE_H

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tests/CMakeLists.txt
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@ -2,6 +2,15 @@
FILE(GLOB GL_TESTS ${CMAKE_CURRENT_SOURCE_DIR}/test_*.h) FILE(GLOB GL_TESTS ${CMAKE_CURRENT_SOURCE_DIR}/test_*.h)
# The allocator tests are host-side unit tests for the standalone block
# allocator: they assert exact heap addresses and allocate multi-megabyte
# scratch pools, neither of which is meaningful (or safe) under KOS. Exclude
# them from the Dreamcast build; the allocator is still exercised on hardware
# indirectly through the texture tests.
if(PLATFORM_DREAMCAST)
list(REMOVE_ITEM GL_TESTS ${CMAKE_CURRENT_SOURCE_DIR}/test_allocator.h)
endif()
INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR}) INCLUDE_DIRECTORIES(${CMAKE_SOURCE_DIR})
SET(TEST_GENERATOR_BIN ${CMAKE_SOURCE_DIR}/tools/test_generator.py) SET(TEST_GENERATOR_BIN ${CMAKE_SOURCE_DIR}/tools/test_generator.py)
@ -16,6 +25,32 @@ ADD_CUSTOM_COMMAND(
add_executable(gldc_tests ${TEST_FILES} ${TEST_SOURCES} ${TEST_MAIN_FILENAME}) add_executable(gldc_tests ${TEST_FILES} ${TEST_SOURCES} ${TEST_MAIN_FILENAME})
target_link_libraries(gldc_tests GL) target_link_libraries(gldc_tests GL)
# Directory holding the committed golden reference images.
#
# On the desktop the tests read/write them straight from the source tree. On
# the Dreamcast the goldens are read through the dcload host-filesystem mount
# (KOS mounts it at /pc), so we point at /pc/goldens and copy the references
# next to the .elf so that running the emulator with `-C .` from the build
# directory exposes them as /pc/goldens.
if(PLATFORM_DREAMCAST)
set(GLDC_GOLDEN_DIR "/pc/goldens")
add_custom_command(
TARGET gldc_tests POST_BUILD
COMMAND ${CMAKE_COMMAND} -E copy_directory
${CMAKE_CURRENT_SOURCE_DIR}/goldens
${CMAKE_CURRENT_BINARY_DIR}/goldens
COMMENT "Copying golden reference images next to gldc_tests.elf"
)
else()
set(GLDC_GOLDEN_DIR "${CMAKE_CURRENT_SOURCE_DIR}/goldens")
endif()
target_compile_definitions(
gldc_tests PRIVATE
GLDC_GOLDEN_DIR="${GLDC_GOLDEN_DIR}"
)
if(NOT PLATFORM_DREAMCAST) if(NOT PLATFORM_DREAMCAST)
set_target_properties( set_target_properties(
gldc_tests gldc_tests

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@ -0,0 +1,127 @@
# GLdc test suite
The tests are plain C++ headers under `tests/`. Every class deriving from
`test::TestCase` (or `GLTestCase`) is auto-discovered (see
`tools/test_generator.py`) and each `void test_*()` method becomes a test case.
They build into the `gldc_tests` binary.
The same tests run on two backends:
* **desktop / software** backend — fast iteration in CI;
* **Dreamcast / kospvr** backend — the real target, run under an emulator.
Suites that drive the GL API derive from **`GLTestCase`** (`tools/gl_test.h`),
which initialises the GPU exactly once and resets GL state before each test
(see "Running once on the Dreamcast" below). Pure non-GL suites (e.g. the
standalone allocator tests) derive from `test::TestCase` directly.
## Desktop
```sh
# configure + build (32-bit desktop build)
mkdir build && cd build
cmake -DCMAKE_BUILD_TYPE=Debug ..
make gldc_tests
# run everything (headless)
SDL_VIDEODRIVER=dummy ./tests/gldc_tests
# run a single suite (prefix match on "Suite::test")
SDL_VIDEODRIVER=dummy ./tests/gldc_tests TextureFormatTests
```
## Dreamcast
Build with the KallistiOS toolchain inside the `kazade/dreamcast-sdk`
container, then run the resulting `.elf` under the
[nitrocast](https://gitlab.com/simulant/nitrocast) emulator:
```sh
# build (from the repo root; KOS_BASE is set inside the container)
podman run --rm -v "$PWD":"$PWD":Z -w "$PWD" localhost/kazade/dreamcast-sdk \
/bin/sh -c "source /etc/bash.bashrc; \
mkdir -p dcbuild && cd dcbuild && \
cmake -DCMAKE_TOOLCHAIN_FILE=../toolchains/Dreamcast.cmake \
-DCMAKE_BUILD_TYPE=Release -DBUILD_SAMPLES=OFF .. && \
make gldc_tests"
# run on the emulator. -u enables dcload host-file syscalls and -C mounts the
# given directory as the dcload filesystem (KOS sees it as /pc), which is where
# the golden references are read from. The build copies goldens/ next to the
# .elf, so run from there:
cd dcbuild/tests
nitrocast -b -e gldc_tests.elf -u -C . -r 32
```
The allocator unit tests are desktop-only (they assert exact host heap
addresses); they are automatically excluded from the Dreamcast build.
### Running once on the Dreamcast
`InitGPU()`/`ShutdownGPU()` map to `pvr_init()`/`pvr_shutdown()`, which must not
be torn down and brought back up between tests. `GLTestCase` therefore opens the
PVR (and the display) lazily on the first test, registers an `atexit()` handler
to shut it down once at program exit, and only *resets* GL state between tests.
New GL-driving suites should derive from `GLTestCase`; if they need extra setup
they should override `set_up()` and call `GLTestCase::set_up()` first.
## What's covered
| File | Focus |
|------|-------|
| `test_glcolor.h` | `glColor*` / `glColorPointer` state |
| `test_glteximage2d.h` | basic internal-format selection |
| `test_pvr_vertex_submission.h`| TA poly-list structure & headers |
| `test_vertex_formats.h` | `glVertexPointer` types/sizes/strides, immediate mode, `glDrawElements` |
| `test_texcoord_formats.h` | `glTexCoordPointer` type scaling, immediate `glTexCoord` |
| `test_texture_formats.h` | byte-exact texture conversion (RGB565 / ARGB4444 / ARGB1555 / RGBA8 / RED / ALPHA / paletted), `glTexSubImage2D`, errors |
| `test_golden_rendering.h` | end-to-end rendered-output comparison |
The format/submission tests work by inspecting the internal state the driver
produces — the converted texture bytes (`TextureObject::data`) and the submitted
vertices in `OP_LIST` / `PT_LIST` / `TR_LIST` — so they are exact and
deterministic, and they pin down the per-type readers and pixel conversions
without needing a framebuffer.
## Golden-image tests
`tools/golden.h` contains a small, self-contained, deterministic CPU rasteriser.
It consumes the **same** TA poly-lists the real backend submits and reproduces
the backend's triangle-strip walk and perspective divide, then fills triangles
with Gouraud vertex colour (optionally modulated by a decoded texture). Output is
compared against committed PPM references in `tests/goldens/`.
Because the rasteriser lives in the test harness (not the library) it doesn't
move when the library changes, so a diff in the rendered output reliably points
at a regression in GLdc's transform / colour / clipping / submission pipeline.
The poly-lists are produced by the real (SH4-compiled) library, so the same
references are validated against actual Dreamcast output too — on the Dreamcast
the textured cases even sample the decoded texture straight out of PVR VRAM.
Comparison is tolerant (per-channel + mismatch-fraction thresholds) so sub-LSB
rounding never causes flakiness.
The references live in `tests/goldens/`. On the desktop they are read straight
from the source tree; on the Dreamcast they are read through the dcload mount at
`/pc/goldens` (the build copies them next to the `.elf`, so `-C .` from the
build directory exposes them).
### Adding or updating a golden
1. Write a test that draws something and calls
`golden::rasterize_all_lists(img)` then
`assert_true(golden::check(img, "my_scene"))`.
2. Generate (or refresh) the reference image (desktop):
```sh
GLDC_UPDATE_GOLDENS=1 SDL_VIDEODRIVER=dummy ./tests/gldc_tests GoldenRenderingTests
```
3. **Eyeball the new `tests/goldens/my_scene.ppm`** before committing it
(any image viewer / `convert ... png` works) and commit it alongside the test.
On a mismatch the harness writes `my_scene.actual.ppm` and `my_scene.diff.ppm`
(differing pixels highlighted red) next to the golden for inspection.
> Note: the video mode is 640×480 and the viewport y-flip is relative to that
> height, so golden scenes place the viewport at `(0, 480 - H)` to capture a
> W×H image at the top-left of the framebuffer.

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tests/test_glcolor.h
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@ -1,6 +1,7 @@
#pragma once #pragma once
#include "tools/test.h" #include "tools/test.h"
#include "tools/gl_test.h"
#include <stdint.h> #include <stdint.h>
#include <GL/gl.h> #include <GL/gl.h>
@ -21,21 +22,11 @@
* index 2 = green (G8IDX) * index 2 = green (G8IDX)
* index 3 = blue (B8IDX) * index 3 = blue (B8IDX)
* =========================================================================*/ * =========================================================================*/
class GlColorTests : public test::TestCase { class GlColorTests : public GLTestCase {
public: public:
void set_up() { /* GLTestCase::set_up() initialises the GPU once and resets the current
GLdcConfig config; * colour to white, which is the known-good starting state these tests
glKosInitConfig(&config); * expect. */
config.texture_twiddle = false;
glKosInitEx(&config);
/* _glInitContext does not reset current_color, so do it explicitly
* here so every test starts from a known white default. */
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
}
void tear_down() {
glKosShutdown();
}
/* After set_up the current colour must be white (1,1,1,1). */ /* After set_up the current colour must be white (1,1,1,1). */
void test_default_color_is_white() { void test_default_color_is_white() {
@ -211,20 +202,9 @@ public:
* pointer, that stride=0 triggers the automatic stride calculation, and * pointer, that stride=0 triggers the automatic stride calculation, and
* that invalid size arguments raise GL_INVALID_VALUE. * that invalid size arguments raise GL_INVALID_VALUE.
* =========================================================================*/ * =========================================================================*/
class GlColorPointerTests : public test::TestCase { class GlColorPointerTests : public GLTestCase {
public: public:
void set_up() { /* GLTestCase::set_up() already clears ATTRIB_LIST.enabled. */
GLdcConfig config;
glKosInitConfig(&config);
config.texture_twiddle = false;
glKosInitEx(&config);
/* Reset enabled flags – _glInitAttributePointers does not do this. */
ATTRIB_LIST.enabled = 0;
}
void tear_down() {
glKosShutdown();
}
/* size=4, GL_FLOAT: stride auto-calculated to 4*4=16. */ /* size=4, GL_FLOAT: stride auto-calculated to 4*4=16. */
void test_colorpointer_size4_float_stores_metadata() { void test_colorpointer_size4_float_stores_metadata() {
@ -352,19 +332,8 @@ public:
* Mirrors GlColorPointerTests for the secondary (offset) colour pointer * Mirrors GlColorPointerTests for the secondary (offset) colour pointer
* stored in ATTRIB_LIST.s_color. * stored in ATTRIB_LIST.s_color.
* =========================================================================*/ * =========================================================================*/
class GlSecondaryColorPointerTests : public test::TestCase { class GlSecondaryColorPointerTests : public GLTestCase {
public: public:
void set_up() {
GLdcConfig config;
glKosInitConfig(&config);
config.texture_twiddle = false;
glKosInitEx(&config);
ATTRIB_LIST.enabled = 0;
}
void tear_down() {
glKosShutdown();
}
/* size=4, GL_FLOAT: basic happy path. */ /* size=4, GL_FLOAT: basic happy path. */
void test_secondary_colorpointer_size4_float_stores_metadata() { void test_secondary_colorpointer_size4_float_stores_metadata() {
@ -460,20 +429,8 @@ public:
* appropriate flag bits in ATTRIB_LIST.enabled are set or cleared, that the * appropriate flag bits in ATTRIB_LIST.enabled are set or cleared, that the
* dirty flag is updated, and that invalid enumerants raise GL_INVALID_ENUM. * dirty flag is updated, and that invalid enumerants raise GL_INVALID_ENUM.
* =========================================================================*/ * =========================================================================*/
class GlClientStateTests : public test::TestCase { class GlClientStateTests : public GLTestCase {
public: public:
void set_up() {
GLdcConfig config;
glKosInitConfig(&config);
config.texture_twiddle = false;
glKosInitEx(&config);
/* Clear all enabled flags for a clean baseline. */
ATTRIB_LIST.enabled = 0;
}
void tear_down() {
glKosShutdown();
}
/* Enabling GL_COLOR_ARRAY must set COLOR_ENABLED_FLAG. */ /* Enabling GL_COLOR_ARRAY must set COLOR_ENABLED_FLAG. */
void test_enable_color_array_sets_flag() { void test_enable_color_array_sets_flag() {

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tests/test_glteximage2d.h
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@ -1,4 +1,7 @@
#pragma once
#include "tools/test.h" #include "tools/test.h"
#include "tools/gl_test.h"
#include <cstring> #include <cstring>
#include <stdint.h> #include <stdint.h>
@ -7,17 +10,14 @@
#include <GL/glkos.h> #include <GL/glkos.h>
class TexImage2DTests : public test::TestCase { class TexImage2DTests : public GLTestCase {
public: public:
uint8_t image_data[8 * 8 * 4] = {0}; uint8_t image_data[8 * 8 * 4] = {0};
uint8_t stride_image_data[96 * 48 * 4] = {0}; uint8_t stride_image_data[96 * 48 * 4] = {0};
uint8_t unpack_row_image_data[128 * 48 * 4] = {0}; uint8_t unpack_row_image_data[128 * 48 * 4] = {0};
void set_up() { void set_up() {
GLdcConfig config; GLTestCase::set_up();
glKosInitConfig(&config);
config.texture_twiddle = false;
glKosInitEx(&config);
/* Init image data so each texel RGBA value matches the /* Init image data so each texel RGBA value matches the
* position in the array */ * position in the array */
@ -29,17 +29,6 @@ public:
} }
} }
void tear_down() {
glKosShutdown();
}
void set_clamp_wrap() {
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
assert_equal(glGetError(), GL_NO_ERROR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
assert_equal(glGetError(), GL_NO_ERROR);
}
void test_rgb_to_rgb565() { void test_rgb_to_rgb565() {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 8, 8, 0, GL_RGB, GL_UNSIGNED_BYTE, image_data); glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 8, 8, 0, GL_RGB, GL_UNSIGNED_BYTE, image_data);
assert_equal(glGetError(), GL_NO_ERROR); assert_equal(glGetError(), GL_NO_ERROR);

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#pragma once
#include "tools/test.h"
#include "tools/gl_test.h"
#include "tools/golden.h"
#include <stdint.h>
#include <GL/gl.h>
#include <GL/glkos.h>
#include "GL/private.h"
/* =========================================================================
* GoldenRenderingTests
*
* End-to-end "golden image" tests. Each test issues real GL draw calls, then
* rasterises the resulting TA poly-lists with the deterministic CPU rasteriser
* in tools/golden.h and compares the output to a committed PPM reference under
* tests/goldens/.
*
* These guard the whole submission pipeline — vertex transform, viewport
* mapping, colour/UV handling, primitive assembly, list routing (opaque vs
* transparent) and texture sampling — against regressions.
*
* To (re)generate the references run the test binary with GLDC_UPDATE_GOLDENS=1.
* =========================================================================*/
class GoldenRenderingTests : public GLTestCase {
public:
/* The video mode is 640x480 and the viewport y-flip is relative to that
* height, so to capture a WxH image at the top-left of the framebuffer we
* place the viewport at (0, 480 - H). */
static const int VIDEO_H = 480;
static const int W = 96;
static const int H = 96;
void set_up() {
GLTestCase::set_up();
glViewport(0, VIDEO_H - H, W, H);
}
/* A single white triangle on a black background. */
void test_solid_white_triangle() {
golden::Image img(W, H);
img.clear(0, 0, 0);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glBegin(GL_TRIANGLES);
glVertex3f(-0.8f, -0.8f, 0.0f);
glVertex3f( 0.8f, -0.8f, 0.0f);
glVertex3f( 0.0f, 0.8f, 0.0f);
glEnd();
golden::rasterize_all_lists(img);
assert_true(golden::check(img, "solid_white_triangle"));
}
/* Gouraud-shaded triangle: red/green/blue corners interpolated. */
void test_gouraud_triangle() {
golden::Image img(W, H);
img.clear(0, 0, 0);
glBegin(GL_TRIANGLES);
glColor4f(1.0f, 0.0f, 0.0f, 1.0f); glVertex3f(-0.8f, -0.8f, 0.0f);
glColor4f(0.0f, 1.0f, 0.0f, 1.0f); glVertex3f( 0.8f, -0.8f, 0.0f);
glColor4f(0.0f, 0.0f, 1.0f, 1.0f); glVertex3f( 0.0f, 0.8f, 0.0f);
glEnd();
golden::rasterize_all_lists(img);
assert_true(golden::check(img, "gouraud_triangle"));
}
/* A full-screen-ish coloured quad built from a triangle strip. */
void test_colored_quad_strip() {
golden::Image img(W, H);
img.clear(16, 16, 16);
glBegin(GL_TRIANGLE_STRIP);
glColor4f(1.0f, 0.0f, 0.0f, 1.0f); glVertex3f(-0.7f, 0.7f, 0.0f);
glColor4f(1.0f, 1.0f, 0.0f, 1.0f); glVertex3f(-0.7f, -0.7f, 0.0f);
glColor4f(0.0f, 1.0f, 0.0f, 1.0f); glVertex3f( 0.7f, 0.7f, 0.0f);
glColor4f(0.0f, 0.0f, 1.0f, 1.0f); glVertex3f( 0.7f, -0.7f, 0.0f);
glEnd();
golden::rasterize_all_lists(img);
assert_true(golden::check(img, "colored_quad_strip"));
}
/* Two overlapping opaque triangles: painter's order must put the second
* (green) on top of the first (red). */
void test_overlapping_opaque_painter_order() {
golden::Image img(W, H);
img.clear(0, 0, 0);
glColor4f(1.0f, 0.0f, 0.0f, 1.0f);
glBegin(GL_TRIANGLES);
glVertex3f(-0.8f, -0.6f, 0.0f);
glVertex3f( 0.4f, -0.6f, 0.0f);
glVertex3f(-0.2f, 0.8f, 0.0f);
glEnd();
glColor4f(0.0f, 1.0f, 0.0f, 1.0f);
glBegin(GL_TRIANGLES);
glVertex3f(-0.4f, -0.8f, 0.0f);
glVertex3f( 0.8f, -0.8f, 0.0f);
glVertex3f( 0.2f, 0.6f, 0.0f);
glEnd();
golden::rasterize_all_lists(img);
assert_true(golden::check(img, "overlapping_opaque"));
}
/* A half-transparent quad over an opaque red triangle: routed to the
* transparent list and alpha-blended by the rasteriser. */
void test_transparent_over_opaque() {
golden::Image img(W, H);
img.clear(0, 0, 0);
/* Opaque red triangle (OP_LIST). */
glDisable(GL_BLEND);
glColor4f(1.0f, 0.0f, 0.0f, 1.0f);
glBegin(GL_TRIANGLES);
glVertex3f(-0.8f, -0.8f, 0.0f);
glVertex3f( 0.8f, -0.8f, 0.0f);
glVertex3f( 0.0f, 0.8f, 0.0f);
glEnd();
/* 50% blue quad on top (TR_LIST). */
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor4f(0.0f, 0.0f, 1.0f, 0.5f);
glBegin(GL_TRIANGLE_STRIP);
glVertex3f(-0.5f, 0.5f, 0.0f);
glVertex3f(-0.5f, -0.5f, 0.0f);
glVertex3f( 0.5f, 0.5f, 0.0f);
glVertex3f( 0.5f, -0.5f, 0.0f);
glEnd();
golden::rasterize_all_lists(img);
assert_true(golden::check(img, "transparent_over_opaque"));
}
/* A Gouraud quad coloured via a GL_BGRA GL_UNSIGNED_BYTE array (OpenGL 1.4),
* blended over a coloured background. This exercises the whole BGRA path end
* to end: the red/blue channel swap must land the right colour at each
* corner, and the per-vertex alpha must drive the blend against the
* background. If BGRA decoded as RGBA, or alpha were ignored, the rendered
* output would differ from the golden. */
void test_bgra_vertex_colors_with_alpha() {
golden::Image img(W, H);
img.clear(40, 40, 40); /* dark grey so blending is visible */
GLfloat verts[] = {
-0.8f, 0.8f, 0.0f,
-0.8f, -0.8f, 0.0f,
0.8f, 0.8f, 0.0f,
0.8f, -0.8f, 0.0f,
};
/* GL_BGRA memory order is B, G, R, A -> colour R, G, B, A.
* Distinct corners with decreasing alpha down/right. */
GLubyte colors[] = {
/* B G R A -> colour */
0, 0, 255, 255, /* opaque red */
0, 255, 0, 192, /* green, ~75% alpha */
255, 0, 0, 128, /* blue, 50% alpha */
0, 255, 255, 64, /* yellow, 25% alpha */
};
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, verts);
glColorPointer(GL_BGRA, GL_UNSIGNED_BYTE, 0, colors);
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
golden::rasterize_all_lists(img);
assert_true(golden::check(img, "bgra_vertex_colors_alpha"));
}
/* A textured quad. A 2x2 RGB texture (red/green/blue/white) is mapped over
* a quad; nearest filtering gives four solid colour cells. */
void test_textured_quad() {
golden::Image img(W, H);
img.clear(0, 0, 0);
/* 8x8 (the PVR minimum) split into four 4x4 colour quadrants:
* red / green / blue / white. */
GLubyte texels[8 * 8 * 3];
for(int y = 0; y < 8; ++y) {
for(int x = 0; x < 8; ++x) {
GLubyte r = 0, g = 0, b = 0;
if(y < 4 && x < 4) { r = 255; } /* top-left red */
else if(y < 4) { g = 255; } /* top-right green */
else if(x < 4) { b = 255; } /* bottom-left blue */
else { r = g = b = 255; } /* bottom-right white */
int i = (y * 8 + x) * 3;
texels[i + 0] = r; texels[i + 1] = g; texels[i + 2] = b;
}
}
GLuint tex = 0;
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 8, 8, 0, GL_RGB, GL_UNSIGNED_BYTE, texels);
assert_equal(glGetError(), GL_NO_ERROR);
glEnable(GL_TEXTURE_2D);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glBegin(GL_TRIANGLE_STRIP);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.8f, 0.8f, 0.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f(-0.8f, -0.8f, 0.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 0.8f, 0.8f, 0.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 0.8f, -0.8f, 0.0f);
glEnd();
golden::rasterize_all_lists(img, _glGetBoundTexture());
assert_true(golden::check(img, "textured_quad"));
glDeleteTextures(1, &tex);
}
/* The same triangle drawn with a coloured background must leave the
* background untouched outside the triangle (clear-colour preservation). */
void test_triangle_preserves_background() {
golden::Image img(W, H);
img.clear(40, 80, 120);
glColor4f(1.0f, 1.0f, 0.0f, 1.0f);
glBegin(GL_TRIANGLES);
glVertex3f(-0.5f, -0.5f, 0.0f);
glVertex3f( 0.5f, -0.5f, 0.0f);
glVertex3f( 0.0f, 0.5f, 0.0f);
glEnd();
golden::rasterize_all_lists(img);
assert_true(golden::check(img, "triangle_on_background"));
}
};

19
tests/test_pvr_vertex_submission.h
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@ -1,6 +1,7 @@
#pragma once #pragma once
#include "tools/test.h" #include "tools/test.h"
#include "tools/gl_test.h"
#include <stdint.h> #include <stdint.h>
#include <GL/gl.h> #include <GL/gl.h>
@ -32,22 +33,10 @@
/* ========================================================================= /* =========================================================================
* PVRVertexSubmissionTests * PVRVertexSubmissionTests
* =========================================================================*/ * =========================================================================*/
class PVRVertexSubmissionTests : public test::TestCase { class PVRVertexSubmissionTests : public GLTestCase {
public: public:
void set_up() { /* GLTestCase::set_up() gives a clean slate: GPU initialised once, colour
GLdcConfig config; * reset to white and all client-state arrays disabled. */
glKosInitConfig(&config);
config.texture_twiddle = false;
glKosInitEx(&config);
/* Explicit clean slate for colour and client-state. */
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
ATTRIB_LIST.enabled = 0;
}
void tear_down() {
glKosShutdown();
}
/* Convenience: cast element i of a list to Vertex*. */ /* Convenience: cast element i of a list to Vertex*. */
static Vertex* vertex_at(PolyList* list, uint32_t i) { static Vertex* vertex_at(PolyList* list, uint32_t i) {

247
tests/test_texcoord_formats.h Normal file
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@ -0,0 +1,247 @@
#pragma once
#include "tools/test.h"
#include "tools/gl_test.h"
#include <stdint.h>
#include <climits>
#include <vector>
#include <GL/gl.h>
#include <GL/glkos.h>
#include "GL/private.h"
#include "GL/state.h"
#include "containers/aligned_vector.h"
/* =========================================================================
* TexCoordFormatTests
*
* Coverage for the texture-coordinate attribute readers (GL/attributes.c).
* The supported glTexCoordPointer types each normalise differently:
* GL_FLOAT / GL_DOUBLE - passed through
* GL_UNSIGNED_BYTE - divided by 255
* GL_SHORT - divided by SHRT_MAX (32767)
* GL_INT - passed through (raw)
* Each is compared against an equivalent GL_FLOAT draw so the per-type scaling
* is pinned down. Immediate-mode glTexCoord2f and the disabled-array (zeroed)
* case are covered too.
* =========================================================================*/
class TexCoordFormatTests : public GLTestCase {
public:
void set_up() {
GLTestCase::set_up();
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
}
static void reset_list() {
aligned_vector_clear(&OP_LIST.vector);
_glGPUStateMarkDirty();
}
static std::vector<Vertex> captured() {
std::vector<Vertex> out;
uint32_t n = aligned_vector_size(&OP_LIST.vector);
for(uint32_t i = 0; i < n; ++i) {
Vertex* v = (Vertex*) aligned_vector_at(&OP_LIST.vector, i);
if(v->flags == GPU_CMD_VERTEX || v->flags == GPU_CMD_VERTEX_EOL) {
out.push_back(*v);
}
}
return out;
}
void assert_uvs_match(const std::vector<Vertex>& a, const std::vector<Vertex>& b) {
assert_equal(a.size(), b.size());
for(size_t i = 0; i < a.size(); ++i) {
assert_close(a[i].uv[0], b[i].uv[0], 0.0005f);
assert_close(a[i].uv[1], b[i].uv[1], 0.0005f);
}
}
/* A fixed triangle for the position data. */
static const GLfloat* positions() {
static const GLfloat verts[] = {
-0.5f, -0.5f, 0.0f,
0.5f, -0.5f, 0.0f,
0.0f, 0.5f, 0.0f,
};
return verts;
}
std::vector<Vertex> draw_with_float_uv(const GLfloat* uv) {
reset_list();
glVertexPointer(3, GL_FLOAT, 0, positions());
glTexCoordPointer(2, GL_FLOAT, 0, uv);
glDrawArrays(GL_TRIANGLES, 0, 3);
return captured();
}
/* --------------------------------------------------------- float basic */
void test_float_uv_passthrough() {
GLfloat uv[] = { 0.0f, 0.0f, 1.0f, 0.0f, 0.5f, 1.0f };
std::vector<Vertex> v = draw_with_float_uv(uv);
assert_equal(v.size(), (size_t) 3);
assert_close(v[0].uv[0], 0.0f, 0.0005f);
assert_close(v[1].uv[0], 1.0f, 0.0005f);
assert_close(v[2].uv[1], 1.0f, 0.0005f);
}
/* --------------------------------------------------------- short / 32767 */
void test_short_uv_is_scaled_by_shrt_max() {
GLshort suv[] = {
0, 0,
SHRT_MAX, 0,
SHRT_MAX / 2, SHRT_MAX,
};
GLfloat fuv[] = {
0.0f, 0.0f,
(float) SHRT_MAX / SHRT_MAX, 0.0f,
(float)(SHRT_MAX / 2) / SHRT_MAX, (float) SHRT_MAX / SHRT_MAX,
};
std::vector<Vertex> fref = draw_with_float_uv(fuv);
reset_list();
glVertexPointer(3, GL_FLOAT, 0, positions());
glTexCoordPointer(2, GL_SHORT, 0, suv);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> sres = captured();
assert_uvs_match(fref, sres);
}
/* --------------------------------------------------------- ubyte / 255 */
void test_ubyte_uv_is_scaled_by_255() {
GLubyte buv[] = { 0, 0, 255, 0, 128, 255 };
GLfloat fuv[] = {
0.0f, 0.0f,
255.0f/255.0f, 0.0f,
128.0f/255.0f, 255.0f/255.0f,
};
std::vector<Vertex> fref = draw_with_float_uv(fuv);
reset_list();
glVertexPointer(3, GL_FLOAT, 0, positions());
glTexCoordPointer(2, GL_UNSIGNED_BYTE, 0, buv);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> bres = captured();
assert_uvs_match(fref, bres);
}
/* --------------------------------------------------------- int raw */
void test_int_uv_is_raw() {
GLint iuv[] = { 0, 0, 1, 0, 0, 1 };
GLfloat fuv[] = { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 1.0f };
std::vector<Vertex> fref = draw_with_float_uv(fuv);
reset_list();
glVertexPointer(3, GL_FLOAT, 0, positions());
glTexCoordPointer(2, GL_INT, 0, iuv);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> ires = captured();
assert_uvs_match(fref, ires);
}
/* --------------------------------------------------------- double */
void test_double_uv_passthrough() {
GLdouble duv[] = { 0.0, 0.0, 1.0, 0.0, 0.5, 1.0 };
GLfloat fuv[] = { 0.0f, 0.0f, 1.0f, 0.0f, 0.5f, 1.0f };
std::vector<Vertex> fref = draw_with_float_uv(fuv);
reset_list();
glVertexPointer(3, GL_FLOAT, 0, positions());
glTexCoordPointer(2, GL_DOUBLE, 0, duv);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> dres = captured();
assert_uvs_match(fref, dres);
}
/* --------------------------------------------------------- stride */
void test_uv_stride_is_respected() {
GLfloat tight[] = { 0.0f, 0.0f, 1.0f, 0.0f, 0.5f, 1.0f };
GLfloat padded[] = {
0.0f, 0.0f, 77.0f,
1.0f, 0.0f, 77.0f,
0.5f, 1.0f, 77.0f,
};
std::vector<Vertex> rt = draw_with_float_uv(tight);
reset_list();
glVertexPointer(3, GL_FLOAT, 0, positions());
glTexCoordPointer(2, GL_FLOAT, 3 * sizeof(GLfloat), padded);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> rp = captured();
assert_uvs_match(rt, rp);
}
/* --------------------------------------------------------- disabled */
/* With the texture-coordinate array disabled, every vertex takes the
* current texture coordinate (set via glTexCoord), matching fixed-function
* GL semantics. */
void test_disabled_coord_array_uses_current_texcoord() {
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoord2f(0.25f, 0.75f);
reset_list();
glVertexPointer(3, GL_FLOAT, 0, positions());
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> v = captured();
assert_equal(v.size(), (size_t) 3);
for(size_t i = 0; i < v.size(); ++i) {
assert_close(v[i].uv[0], 0.25f, 0.0005f);
assert_close(v[i].uv[1], 0.75f, 0.0005f);
}
}
/* --------------------------------------------------------- immediate */
void test_immediate_texcoord2f_reaches_vertex() {
reset_list();
glBegin(GL_TRIANGLES);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f, 0.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 0.5f, -0.5f, 0.0f);
glTexCoord2f(0.5f, 1.0f); glVertex3f( 0.0f, 0.5f, 0.0f);
glEnd();
std::vector<Vertex> v = captured();
assert_equal(v.size(), (size_t) 3);
assert_close(v[0].uv[0], 0.0f, 0.0005f);
assert_close(v[0].uv[1], 0.0f, 0.0005f);
assert_close(v[1].uv[0], 1.0f, 0.0005f);
assert_close(v[2].uv[0], 0.5f, 0.0005f);
assert_close(v[2].uv[1], 1.0f, 0.0005f);
}
/* Immediate texcoords must match the equivalent vertex-array draw. */
void test_immediate_texcoord_matches_array() {
GLfloat uv[] = { 0.0f, 0.0f, 1.0f, 0.0f, 0.5f, 1.0f };
std::vector<Vertex> arr = draw_with_float_uv(uv);
reset_list();
glBegin(GL_TRIANGLES);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-0.5f, -0.5f, 0.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f( 0.5f, -0.5f, 0.0f);
glTexCoord2f(0.5f, 1.0f); glVertex3f( 0.0f, 0.5f, 0.0f);
glEnd();
std::vector<Vertex> imm = captured();
assert_uvs_match(arr, imm);
}
};

321
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#pragma once
#include "tools/test.h"
#include "tools/gl_test.h"
#include <stdint.h>
#include <vector>
#include <GL/gl.h>
#include <GL/glext.h>
#include <GL/glkos.h>
#include "GL/private.h"
/* =========================================================================
* TextureFormatTests
*
* Regression coverage for texture *loading*: that glTexImage2D / glTexSubImage2D
* pick the right internal format and, crucially, that the host->PVR pixel
* conversion produces the exact expected bytes. These checks are byte-exact and
* fully deterministic, so they pin down the conversion routines (RGB565,
* ARGB4444, ARGB1555, RGBA8, RED/ALPHA/LUMINANCE sources, paletted) against
* accidental changes.
*
* Twiddling is left OFF for the byte-exact tests so the stored data is a plain
* row-major array of 16/32-bit texels we can index directly. Twiddled layouts
* are validated at the internal-format level only.
* =========================================================================*/
class TextureFormatTests : public GLTestCase {
public:
GLuint tex = 0;
void set_up() {
GLTestCase::set_up();
glGenTextures(1, &tex);
glBindTexture(GL_TEXTURE_2D, tex);
}
void tear_down() {
glDeleteTextures(1, &tex);
GLTestCase::tear_down();
}
/* The converted 16bpp texel array for the currently bound texture. */
static const uint16_t* data16() {
return (const uint16_t*) _glGetBoundTexture()->data;
}
static const uint8_t* data8() {
return (const uint8_t*) _glGetBoundTexture()->data;
}
static GLint internal_format() {
GLint f;
glGetIntegerv(GL_TEXTURE_INTERNAL_FORMAT_KOS, &f);
return f;
}
/* ------------------------------------------------------ Internal format */
void test_rgb_ubyte_selects_rgb565() {
std::vector<uint8_t> img(8 * 8 * 3, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 8, 8, 0, GL_RGB, GL_UNSIGNED_BYTE, img.data());
assert_equal(glGetError(), GL_NO_ERROR);
assert_equal(internal_format(), GL_RGB565_KOS);
}
void test_rgba_ubyte_selects_argb4444() {
std::vector<uint8_t> img(8 * 8 * 4, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE, img.data());
assert_equal(glGetError(), GL_NO_ERROR);
assert_equal(internal_format(), GL_ARGB4444_KOS);
}
void test_twiddle_enabled_selects_twiddled_format() {
std::vector<uint8_t> img(8 * 8 * 3, 0);
glEnable(GL_TEXTURE_TWIDDLE_KOS);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 8, 8, 0, GL_RGB, GL_UNSIGNED_BYTE, img.data());
glDisable(GL_TEXTURE_TWIDDLE_KOS);
assert_equal(glGetError(), GL_NO_ERROR);
assert_equal(internal_format(), GL_RGB565_TWID_KOS);
}
/* ----------------------------------------------------- Dimensions/state */
void test_dimensions_are_stored() {
std::vector<uint8_t> img(16 * 32 * 3, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 16, 32, 0, GL_RGB, GL_UNSIGNED_BYTE, img.data());
assert_equal(glGetError(), GL_NO_ERROR);
TextureObject* t = _glGetBoundTexture();
assert_equal((int) t->width, 16);
assert_equal((int) t->height, 32);
}
/* ------------------------------------------------- Byte-exact: RGB565 */
void test_rgb888_to_rgb565_packing() {
/* Four distinct texels with known RGB values. */
uint8_t img[8 * 8 * 3] = {0};
uint8_t colors[4][3] = {
{255, 0, 0}, /* red */
{ 0, 255, 0}, /* green */
{ 0, 0, 255}, /* blue */
{130, 70, 30}, /* arbitrary */
};
for(int i = 0; i < 4; ++i) {
img[i * 3 + 0] = colors[i][0];
img[i * 3 + 1] = colors[i][1];
img[i * 3 + 2] = colors[i][2];
}
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 8, 8, 0, GL_RGB, GL_UNSIGNED_BYTE, img);
assert_equal(glGetError(), GL_NO_ERROR);
const uint16_t* d = data16();
for(int i = 0; i < 4; ++i) {
uint16_t r = (colors[i][0] >> 3) & 0x1f;
uint16_t g = (colors[i][1] >> 2) & 0x3f;
uint16_t b = (colors[i][2] >> 3) & 0x1f;
uint16_t expected = (r << 11) | (g << 5) | b;
assert_equal(d[i], expected);
}
}
void test_red_ubyte_to_rgb565_only_sets_red() {
uint8_t img[8 * 8] = {0};
img[0] = 0xFF; /* full red */
img[1] = 0x80;
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB565_KOS, 8, 8, 0, GL_RED, GL_UNSIGNED_BYTE, img);
assert_equal(glGetError(), GL_NO_ERROR);
const uint16_t* d = data16();
/* _r8_to_rgb565: (r & 0xF8) << 8 -> only top 5 red bits, green/blue zero */
assert_equal(d[0], (uint16_t)((0xFF & 0xF8) << 8));
assert_equal(d[1], (uint16_t)((0x80 & 0xF8) << 8));
/* green/blue bits must be clear */
assert_equal((int)(d[0] & 0x07FF), 0);
}
/* ------------------------------------------------- Byte-exact: ARGB4444 */
void test_rgba8888_to_argb4444_packing() {
uint8_t img[8 * 8 * 4] = {0};
uint8_t colors[4][4] = {
{0xFF, 0x00, 0x00, 0xFF}, /* opaque red */
{0x00, 0xFF, 0x00, 0x80}, /* half green */
{0x00, 0x00, 0xFF, 0x00}, /* transp blue */
{0x12, 0x34, 0x56, 0x78}, /* arbitrary */
};
for(int i = 0; i < 4; ++i)
for(int c = 0; c < 4; ++c)
img[i * 4 + c] = colors[i][c];
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE, img);
assert_equal(glGetError(), GL_NO_ERROR);
const uint16_t* d = data16();
for(int i = 0; i < 4; ++i) {
uint8_t r = colors[i][0], g = colors[i][1], b = colors[i][2], a = colors[i][3];
uint16_t expected = ((a & 0xF0) << 8) | ((r & 0xF0) << 4) | (g & 0xF0) | ((b & 0xF0) >> 4);
assert_equal(d[i], expected);
}
}
void test_alpha_ubyte_to_argb4444_replicates_alpha() {
uint8_t img[8 * 8] = {0};
img[0] = 0xFF;
img[1] = 0x00;
img[2] = 0x5A;
glTexImage2D(GL_TEXTURE_2D, 0, GL_ARGB4444_KOS, 8, 8, 0, GL_ALPHA, GL_UNSIGNED_BYTE, img);
assert_equal(glGetError(), GL_NO_ERROR);
const uint16_t* d = data16();
/* _a8_to_argb4444 replicates the top nibble across all 4 channels. */
for(int i = 0; i < 3; ++i) {
uint8_t a4 = (img[i] >> 4) & 0xF;
uint16_t expected = (a4 << 12) | (a4 << 8) | (a4 << 4) | a4;
assert_equal(d[i], expected);
}
}
/* GL_RGBA8 is not a native PVR texture format in GLdc; it is downgraded to
* ARGB4444. Pin that behaviour so a change is noticed. */
void test_rgba8_is_downgraded_to_argb4444() {
std::vector<uint8_t> img(8 * 8 * 4, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 8, 8, 0, GL_RGBA, GL_UNSIGNED_BYTE, img.data());
assert_equal(glGetError(), GL_NO_ERROR);
assert_equal(internal_format(), GL_ARGB4444_KOS);
}
/* ------------------------------------------------- glTexSubImage2D */
void test_subimage_updates_only_target_region() {
/* The 2-wide RGB sub-image below is tightly packed (6 bytes/row), so it
* does not satisfy the default GL_UNPACK_ALIGNMENT of 4 (which would pad
* each row to 8 bytes). Tell GL the rows are tightly packed. */
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
/* Start with an all-black 16x16 RGB565 texture. */
std::vector<uint8_t> img(16 * 16 * 3, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 16, 16, 0, GL_RGB, GL_UNSIGNED_BYTE, img.data());
assert_equal(glGetError(), GL_NO_ERROR);
/* Replace a 2x2 block at (4,4) with red. */
uint8_t sub[2 * 2 * 3];
for(int i = 0; i < 4; ++i) { sub[i*3+0] = 255; sub[i*3+1] = 0; sub[i*3+2] = 0; }
glTexSubImage2D(GL_TEXTURE_2D, 0, 4, 4, 2, 2, GL_RGB, GL_UNSIGNED_BYTE, sub);
assert_equal(glGetError(), GL_NO_ERROR);
const uint16_t* d = data16();
uint16_t red565 = (uint16_t)((0xFF >> 3) << 11);
/* Updated texels are red, a neighbour outside the region is still black. */
assert_equal(d[4 * 16 + 4], red565);
assert_equal(d[4 * 16 + 5], red565);
assert_equal(d[5 * 16 + 4], red565);
assert_equal(d[5 * 16 + 5], red565);
assert_equal(d[4 * 16 + 6], (uint16_t) 0); /* just right of region */
assert_equal(d[0], (uint16_t) 0); /* corner untouched */
}
/* ------------------------------------------------- Paletted textures */
void test_color_index8_is_paletted() {
std::vector<uint8_t> img(8 * 8, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_COLOR_INDEX8_EXT, 8, 8, 0,
GL_COLOR_INDEX, GL_UNSIGNED_BYTE, img.data());
assert_equal(glGetError(), GL_NO_ERROR);
TextureObject* t = _glGetBoundTexture();
assert_true(t->isPaletted);
/* Paletted formats are always twiddled internally. */
assert_equal(t->internalFormat, GL_COLOR_INDEX8_TWID_KOS);
}
void test_color_table_then_indexed_texture_no_error() {
/* A 4 entry RGBA palette. */
uint8_t palette[4 * 4] = {
255, 0, 0, 255,
0, 255, 0, 255,
0, 0, 255, 255,
255, 255, 255, 255,
};
glColorTableEXT(GL_TEXTURE_2D, GL_RGBA8, 4, GL_RGBA, GL_UNSIGNED_BYTE, palette);
assert_equal(glGetError(), GL_NO_ERROR);
uint8_t indices[8 * 8];
for(int i = 0; i < 8 * 8; ++i) indices[i] = i & 3;
glTexImage2D(GL_TEXTURE_2D, 0, GL_COLOR_INDEX8_EXT, 8, 8, 0,
GL_COLOR_INDEX, GL_UNSIGNED_BYTE, indices);
assert_equal(glGetError(), GL_NO_ERROR);
TextureObject* t = _glGetBoundTexture();
assert_is_not_null(t->palette);
}
/* ------------------------------------------------- Error handling */
void test_non_power_of_two_width_raises_invalid_value() {
std::vector<uint8_t> img(24 * 8 * 3, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 24, 8, 0, GL_RGB, GL_UNSIGNED_BYTE, img.data());
assert_equal(glGetError(), GL_INVALID_VALUE);
}
void test_oversized_texture_raises_invalid_value() {
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 2048, 8, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
assert_equal(glGetError(), GL_INVALID_VALUE);
}
void test_invalid_target_raises_invalid_enum() {
std::vector<uint8_t> img(8 * 8 * 3, 0);
/* Any target other than GL_TEXTURE_2D is unsupported. */
glTexImage2D((GLenum) 0x0DE0 /* GL_TEXTURE_1D */, 0, GL_RGB, 8, 8, 0,
GL_RGB, GL_UNSIGNED_BYTE, img.data());
assert_equal(glGetError(), GL_INVALID_ENUM);
}
/* ------------------------------------------------- Multiple textures */
void test_two_textures_keep_independent_data() {
GLuint a = 0, b = 0;
glGenTextures(1, &a);
glGenTextures(1, &b);
uint8_t reds[8 * 8 * 3];
uint8_t blues[8 * 8 * 3];
for(int i = 0; i < 8 * 8; ++i) {
reds[i*3+0] = 255; reds[i*3+1] = 0; reds[i*3+2] = 0;
blues[i*3+0] = 0; blues[i*3+1] = 0; blues[i*3+2] = 255;
}
glBindTexture(GL_TEXTURE_2D, a);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 8, 8, 0, GL_RGB, GL_UNSIGNED_BYTE, reds);
glBindTexture(GL_TEXTURE_2D, b);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 8, 8, 0, GL_RGB, GL_UNSIGNED_BYTE, blues);
assert_equal(glGetError(), GL_NO_ERROR);
uint16_t red565 = (uint16_t)((0xFF >> 3) << 11);
uint16_t blue565 = (uint16_t)((0xFF >> 3));
glBindTexture(GL_TEXTURE_2D, a);
assert_equal(data16()[0], red565);
glBindTexture(GL_TEXTURE_2D, b);
assert_equal(data16()[0], blue565);
glDeleteTextures(1, &a);
glDeleteTextures(1, &b);
}
/* Re-uploading a different size to the same texture must reallocate and
* store the new dimensions. */
void test_reupload_different_size_updates_dimensions() {
std::vector<uint8_t> img(8 * 8 * 3, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 8, 8, 0, GL_RGB, GL_UNSIGNED_BYTE, img.data());
std::vector<uint8_t> img2(32 * 32 * 3, 0);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 32, 32, 0, GL_RGB, GL_UNSIGNED_BYTE, img2.data());
assert_equal(glGetError(), GL_NO_ERROR);
TextureObject* t = _glGetBoundTexture();
assert_equal((int) t->width, 32);
assert_equal((int) t->height, 32);
}
};

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#pragma once
#include "tools/test.h"
#include "tools/gl_test.h"
#include <stdint.h>
#include <vector>
#include <GL/gl.h>
#include <GL/glkos.h>
#include "GL/private.h"
#include "GL/state.h"
#include "containers/aligned_vector.h"
/* =========================================================================
* VertexColorTests
*
* Byte vertex-colour coverage for glColorPointer, with particular attention to
* GL_BGRA as specified by OpenGL 1.4.
*
* Per the spec, a colour array may use size = GL_BGRA (only valid with
* GL_UNSIGNED_BYTE). The four bytes are then stored in memory in B, G, R, A
* order but are interpreted as the R, G, B, A colour components — i.e. the
* red and blue channels are swapped relative to a normal GL_RGBA array. Alpha
* stays in the last byte.
*
* GLdc stores the resulting colour per vertex as normalised floats in ARGB
* slot order (A8IDX / R8IDX / G8IDX / B8IDX). These tests draw a triangle and
* read the submitted vertices back out of OP_LIST to verify the byte->float
* conversion and the BGRA channel ordering.
* =========================================================================*/
class VertexColorTests : public GLTestCase {
public:
static const GLfloat* positions() {
static const GLfloat verts[] = {
-1.0f, -1.0f, 0.5f,
1.0f, -1.0f, 0.5f,
0.0f, 1.0f, 0.5f,
};
return verts;
}
/* Submitted (non-header) vertices currently in OP_LIST. */
static std::vector<Vertex> captured() {
std::vector<Vertex> out;
uint32_t n = aligned_vector_size(&OP_LIST.vector);
for(uint32_t i = 0; i < n; ++i) {
Vertex* v = (Vertex*) aligned_vector_at(&OP_LIST.vector, i);
if(v->flags == GPU_CMD_VERTEX || v->flags == GPU_CMD_VERTEX_EOL) {
out.push_back(*v);
}
}
return out;
}
/* Draw a single triangle whose vertices use the supplied colour array. */
std::vector<Vertex> draw_with_colors(GLint size, GLenum type, const void* colors) {
glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_COLOR_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, positions());
glColorPointer(size, type, 0, colors);
glDrawArrays(GL_TRIANGLES, 0, 3);
return captured();
}
void assert_argb_close(const Vertex& v, float r, float g, float b, float a) {
assert_close(v.argb[R8IDX], r, 0.005f);
assert_close(v.argb[G8IDX], g, 0.005f);
assert_close(v.argb[B8IDX], b, 0.005f);
assert_close(v.argb[A8IDX], a, 0.005f);
}
/* --------------------------------------------------- byte RGBA values */
/* size=4 GL_UNSIGNED_BYTE: each byte is normalised by 1/255 and kept in
* RGBA order. Use non-trivial values so a wrong scale or order shows up. */
void test_byte_rgba4_normalizes_and_keeps_order() {
GLubyte colors[] = {
10, 20, 30, 40,
200, 150, 100, 50,
255, 128, 1, 254,
};
std::vector<Vertex> v = draw_with_colors(4, GL_UNSIGNED_BYTE, colors);
assert_equal(v.size(), (size_t) 3);
assert_argb_close(v[0], 10/255.0f, 20/255.0f, 30/255.0f, 40/255.0f);
assert_argb_close(v[1], 200/255.0f, 150/255.0f, 100/255.0f, 50/255.0f);
assert_argb_close(v[2], 255/255.0f, 128/255.0f, 1/255.0f, 254/255.0f);
}
/* size=3 GL_UNSIGNED_BYTE: RGB normalised, alpha forced to 1.0. */
void test_byte_rgb3_forces_alpha_one() {
GLubyte colors[] = {
10, 20, 30,
200, 150, 100,
0, 0, 0,
};
std::vector<Vertex> v = draw_with_colors(3, GL_UNSIGNED_BYTE, colors);
assert_equal(v.size(), (size_t) 3);
assert_argb_close(v[0], 10/255.0f, 20/255.0f, 30/255.0f, 1.0f);
assert_argb_close(v[1], 200/255.0f, 150/255.0f, 100/255.0f, 1.0f);
assert_argb_close(v[2], 0.0f, 0.0f, 0.0f, 1.0f);
}
/* --------------------------------------------------- GL_BGRA (GL 1.4) */
/* GL_BGRA: memory order is B, G, R, A but maps to R, G, B, A. With distinct
* channel values this proves the red/blue swap (and that alpha is the last
* byte). */
void test_bgra_byte_channel_order() {
/* memory: B=10, G=20, R=30, A=200 -> colour R=30, G=20, B=10, A=200 */
GLubyte colors[] = {
10, 20, 30, 200,
10, 20, 30, 200,
10, 20, 30, 200,
};
std::vector<Vertex> v = draw_with_colors(GL_BGRA, GL_UNSIGNED_BYTE, colors);
assert_equal(v.size(), (size_t) 3);
for(size_t i = 0; i < v.size(); ++i) {
assert_argb_close(v[i], 30/255.0f, 20/255.0f, 10/255.0f, 200/255.0f);
}
}
/* A GL_BGRA array laid out as {B,G,R,A} must produce exactly the same
* submitted colour as the equivalent GL_RGBA array {R,G,B,A}. */
void test_bgra_matches_equivalent_rgba() {
/* Logical colour: R=30, G=20, B=10, A=200 */
GLubyte rgba[] = {
30, 20, 10, 200,
30, 20, 10, 200,
30, 20, 10, 200,
};
GLubyte bgra[] = {
10, 20, 30, 200,
10, 20, 30, 200,
10, 20, 30, 200,
};
std::vector<Vertex> rgba_v = draw_with_colors(4, GL_UNSIGNED_BYTE, rgba);
/* Fresh list for the BGRA draw. */
aligned_vector_clear(&OP_LIST.vector);
_glGPUStateMarkDirty();
std::vector<Vertex> bgra_v = draw_with_colors(GL_BGRA, GL_UNSIGNED_BYTE, bgra);
assert_equal(rgba_v.size(), bgra_v.size());
for(size_t i = 0; i < rgba_v.size(); ++i) {
assert_close(rgba_v[i].argb[R8IDX], bgra_v[i].argb[R8IDX], 0.005f);
assert_close(rgba_v[i].argb[G8IDX], bgra_v[i].argb[G8IDX], 0.005f);
assert_close(rgba_v[i].argb[B8IDX], bgra_v[i].argb[B8IDX], 0.005f);
assert_close(rgba_v[i].argb[A8IDX], bgra_v[i].argb[A8IDX], 0.005f);
}
}
/* Distinct per-vertex GL_BGRA colours must each map correctly. */
void test_bgra_per_vertex_distinct() {
GLubyte colors[] = {
/* B G R A -> R / G / B / A */
0, 0, 255, 255, /* red, opaque */
0, 255, 0, 128, /* green, half a */
255, 0, 0, 64, /* blue, quarter */
};
std::vector<Vertex> v = draw_with_colors(GL_BGRA, GL_UNSIGNED_BYTE, colors);
assert_equal(v.size(), (size_t) 3);
assert_argb_close(v[0], 1.0f, 0.0f, 0.0f, 255/255.0f); /* red */
assert_argb_close(v[1], 0.0f, 1.0f, 0.0f, 128/255.0f); /* green */
assert_argb_close(v[2], 0.0f, 0.0f, 1.0f, 64/255.0f); /* blue */
}
/* Alpha for GL_BGRA comes from the last byte, independent of the RGB
* channels. */
void test_bgra_alpha_is_independent() {
GLubyte colors[] = {
255, 255, 255, 0, /* white, fully transparent */
255, 255, 255, 0,
255, 255, 255, 0,
};
std::vector<Vertex> v = draw_with_colors(GL_BGRA, GL_UNSIGNED_BYTE, colors);
assert_equal(v.size(), (size_t) 3);
for(size_t i = 0; i < v.size(); ++i) {
assert_argb_close(v[i], 1.0f, 1.0f, 1.0f, 0.0f);
}
}
/* GL_BGRA is accepted by glColorPointer without raising an error. */
void test_bgra_size_is_accepted() {
GLubyte colors[] = { 1, 2, 3, 4 };
glColorPointer(GL_BGRA, GL_UNSIGNED_BYTE, 0, colors);
assert_equal(glGetError(), GL_NO_ERROR);
assert_equal(ATTRIB_LIST.colour.size, (GLint) GL_BGRA);
}
};

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#pragma once
#include "tools/test.h"
#include "tools/gl_test.h"
#include <stdint.h>
#include <vector>
#include <GL/gl.h>
#include <GL/glkos.h>
#include "GL/private.h"
#include "GL/state.h"
#include "containers/aligned_vector.h"
/* =========================================================================
* VertexFormatTests
*
* Coverage for the vertex-position attribute readers used by glDrawArrays /
* glDrawElements (GL/attributes.c). Each supported pointer type (float, short,
* int, byte, double) and size (2 / 3) is exercised, and the *submitted* vertex
* positions are compared against an equivalent GL_FLOAT draw.
*
* This pins down the per-type interpretation, e.g. that GL_SHORT/GL_INT are
* read as raw values while GL_UNSIGNED_BYTE is normalised by 1/255, so a
* regression in any reader is caught without depending on the exact viewport
* matrix maths.
* =========================================================================*/
class VertexFormatTests : public GLTestCase {
public:
void set_up() {
GLTestCase::set_up();
glEnableClientState(GL_VERTEX_ARRAY);
}
/* Empty OP_LIST and force a fresh poly header on the next draw. */
static void reset_list() {
aligned_vector_clear(&OP_LIST.vector);
_glGPUStateMarkDirty();
}
/* All vertex-flagged entries currently in OP_LIST (headers skipped). */
static std::vector<Vertex> captured() {
std::vector<Vertex> out;
uint32_t n = aligned_vector_size(&OP_LIST.vector);
for(uint32_t i = 0; i < n; ++i) {
Vertex* v = (Vertex*) aligned_vector_at(&OP_LIST.vector, i);
if(v->flags == GPU_CMD_VERTEX || v->flags == GPU_CMD_VERTEX_EOL) {
out.push_back(*v);
}
}
return out;
}
void assert_positions_match(const std::vector<Vertex>& a, const std::vector<Vertex>& b) {
assert_equal(a.size(), b.size());
for(size_t i = 0; i < a.size(); ++i) {
assert_close(a[i].xyz[0], b[i].xyz[0], 0.01f);
assert_close(a[i].xyz[1], b[i].xyz[1], 0.01f);
assert_close(a[i].xyz[2], b[i].xyz[2], 0.01f);
assert_close(a[i].w, b[i].w, 0.01f);
}
}
/* --------------------------------------------------------- float (ref) */
void test_float_size3_basic_submission() {
GLfloat verts[] = {
-0.5f, -0.5f, 0.0f,
0.5f, -0.5f, 0.0f,
0.0f, 0.5f, 0.0f,
};
reset_list();
glVertexPointer(3, GL_FLOAT, 0, verts);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> v = captured();
assert_equal(v.size(), (size_t) 3);
/* w must be 1 for an identity transform of a z=0 triangle. */
assert_close(v[0].w, 1.0f, 0.001f);
}
/* --------------------------------------------------------- short == float */
void test_short_matches_equivalent_float() {
GLshort sverts[] = { 2, 3, 5, 7, 11, 1 }; /* size 2 */
GLfloat fverts[] = { 2, 3, 5, 7, 11, 1 };
reset_list();
glVertexPointer(2, GL_FLOAT, 0, fverts);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> fref = captured();
reset_list();
glVertexPointer(2, GL_SHORT, 0, sverts);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> sres = captured();
assert_positions_match(fref, sres);
}
/* --------------------------------------------------------- int == float */
void test_int_matches_equivalent_float() {
GLint iverts[] = { 1, 4, 6, 2, 3, 9 };
GLfloat fverts[] = { 1, 4, 6, 2, 3, 9 };
reset_list();
glVertexPointer(2, GL_FLOAT, 0, fverts);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> fref = captured();
reset_list();
glVertexPointer(2, GL_INT, 0, iverts);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> ires = captured();
assert_positions_match(fref, ires);
}
/* --------------------------------------------------------- double == float */
void test_double_matches_equivalent_float() {
GLdouble dverts[] = { -0.5, -0.5, 0.5, -0.5, 0.0, 0.5 };
GLfloat fverts[] = { -0.5f, -0.5f, 0.5f, -0.5f, 0.0f, 0.5f };
reset_list();
glVertexPointer(2, GL_FLOAT, 0, fverts);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> fref = captured();
reset_list();
glVertexPointer(2, GL_DOUBLE, 0, dverts);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> dres = captured();
assert_positions_match(fref, dres);
}
/* GL_UNSIGNED_BYTE positions are normalised by 1/255. */
void test_ubyte_matches_normalized_float() {
GLubyte bverts[] = { 10, 20, 30, 40, 50, 60 };
GLfloat fverts[] = {
10.0f/255.0f, 20.0f/255.0f,
30.0f/255.0f, 40.0f/255.0f,
50.0f/255.0f, 60.0f/255.0f,
};
reset_list();
glVertexPointer(2, GL_FLOAT, 0, fverts);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> fref = captured();
reset_list();
glVertexPointer(2, GL_UNSIGNED_BYTE, 0, bverts);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> bres = captured();
assert_positions_match(fref, bres);
}
/* --------------------------------------------------------- size 2 vs 3 */
/* A size-2 pointer must produce z == 0 (and therefore match a size-3 draw
* whose z components are all zero). */
void test_size2_implies_zero_z() {
GLfloat v2[] = { -0.5f, -0.5f, 0.5f, -0.5f, 0.0f, 0.5f };
GLfloat v3[] = {
-0.5f, -0.5f, 0.0f,
0.5f, -0.5f, 0.0f,
0.0f, 0.5f, 0.0f,
};
reset_list();
glVertexPointer(3, GL_FLOAT, 0, v3);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> r3 = captured();
reset_list();
glVertexPointer(2, GL_FLOAT, 0, v2);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> r2 = captured();
assert_positions_match(r3, r2);
}
/* --------------------------------------------------------- stride */
/* An interleaved array with padding between vertices must read the same
* positions as a tightly-packed one. */
void test_custom_stride_is_respected() {
GLfloat tight[] = {
-0.5f, -0.5f, 0.0f,
0.5f, -0.5f, 0.0f,
0.0f, 0.5f, 0.0f,
};
/* Same positions, but each followed by 2 padding floats (stride 20). */
GLfloat padded[] = {
-0.5f, -0.5f, 0.0f, 99.0f, 99.0f,
0.5f, -0.5f, 0.0f, 99.0f, 99.0f,
0.0f, 0.5f, 0.0f, 99.0f, 99.0f,
};
reset_list();
glVertexPointer(3, GL_FLOAT, 0, tight);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> rt = captured();
reset_list();
glVertexPointer(3, GL_FLOAT, 5 * sizeof(GLfloat), padded);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> rp = captured();
assert_positions_match(rt, rp);
}
/* --------------------------------------------------------- glDrawElements */
void test_draw_elements_matches_draw_arrays() {
GLfloat verts[] = {
-0.5f, -0.5f, 0.0f,
0.5f, -0.5f, 0.0f,
0.0f, 0.5f, 0.0f,
};
GLubyte indices[] = { 0, 1, 2 };
reset_list();
glVertexPointer(3, GL_FLOAT, 0, verts);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> da = captured();
reset_list();
glVertexPointer(3, GL_FLOAT, 0, verts);
glDrawElements(GL_TRIANGLES, 3, GL_UNSIGNED_BYTE, indices);
std::vector<Vertex> de = captured();
assert_positions_match(da, de);
}
/* glDrawElements honours the index order. */
void test_draw_elements_reorders_vertices() {
GLfloat verts[] = {
-0.5f, -0.5f, 0.0f,
0.5f, -0.5f, 0.0f,
0.0f, 0.5f, 0.0f,
};
GLubyte forward[] = { 0, 1, 2 };
GLubyte reversed[] = { 2, 1, 0 };
reset_list();
glVertexPointer(3, GL_FLOAT, 0, verts);
glDrawElements(GL_TRIANGLES, 3, GL_UNSIGNED_BYTE, forward);
std::vector<Vertex> f = captured();
reset_list();
glVertexPointer(3, GL_FLOAT, 0, verts);
glDrawElements(GL_TRIANGLES, 3, GL_UNSIGNED_BYTE, reversed);
std::vector<Vertex> r = captured();
assert_equal(f.size(), (size_t) 3);
/* First of forward == last of reversed. */
assert_close(f[0].xyz[0], r[2].xyz[0], 0.01f);
assert_close(f[0].xyz[1], r[2].xyz[1], 0.01f);
assert_close(f[2].xyz[0], r[0].xyz[0], 0.01f);
}
/* --------------------------------------------------------- immediate mode */
/* glVertex2f(x,y) must equal glVertex3f(x,y,0). */
void test_immediate_vertex2f_equals_vertex3f_zero_z() {
reset_list();
glBegin(GL_TRIANGLES);
glVertex3f(-0.5f, -0.5f, 0.0f);
glVertex3f( 0.5f, -0.5f, 0.0f);
glVertex3f( 0.0f, 0.5f, 0.0f);
glEnd();
std::vector<Vertex> v3 = captured();
reset_list();
glBegin(GL_TRIANGLES);
glVertex2f(-0.5f, -0.5f);
glVertex2f( 0.5f, -0.5f);
glVertex2f( 0.0f, 0.5f);
glEnd();
std::vector<Vertex> v2 = captured();
assert_positions_match(v3, v2);
}
/* Immediate mode must produce the same submission as an equivalent
* vertex-array draw. */
void test_immediate_matches_vertex_array() {
GLfloat verts[] = {
-0.5f, -0.5f, 0.0f,
0.5f, -0.5f, 0.0f,
0.0f, 0.5f, 0.0f,
};
reset_list();
glVertexPointer(3, GL_FLOAT, 0, verts);
glDrawArrays(GL_TRIANGLES, 0, 3);
std::vector<Vertex> arr = captured();
reset_list();
glBegin(GL_TRIANGLES);
glVertex3f(-0.5f, -0.5f, 0.0f);
glVertex3f( 0.5f, -0.5f, 0.0f);
glVertex3f( 0.0f, 0.5f, 0.0f);
glEnd();
std::vector<Vertex> imm = captured();
assert_positions_match(arr, imm);
}
};

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/*
* Shared test fixture for GLdc tests that drive the GL API.
*
* On the Dreamcast the GPU/PVR (and the display) must be initialised exactly
* once: InitGPU() calls pvr_init() and ShutdownGPU() calls pvr_shutdown(), and
* tearing those down and back up between every test is both slow and fragile on
* real hardware / emulators. So this fixture:
*
* - initialises the GPU lazily on the first test and registers an atexit()
* handler to shut it down once, at program exit (window opens at start,
* closes at the end);
* - resets the mutable GL state to a known baseline before each test, without
* re-initialising the GPU.
*
* GL-driving test suites should derive from GLTestCase (instead of
* test::TestCase). If a suite needs extra per-test setup it should override
* set_up()/tear_down() and call GLTestCase::set_up()/tear_down() first.
*/
#pragma once
#include <cstdlib>
#include "tools/test.h"
#include <GL/gl.h>
#include <GL/glkos.h>
#include "GL/private.h"
#include "GL/state.h"
#include "containers/aligned_vector.h"
class GLTestCase : public test::TestCase {
public:
/* One-shot init flag (function-local static to keep this header-only). */
static bool& gpu_initialized() {
static bool v = false;
return v;
}
static void shutdown_gpu_at_exit() {
glKosShutdown();
}
static void ensure_gpu_initialized() {
if(gpu_initialized()) {
return;
}
GLdcConfig config;
glKosInitConfig(&config);
config.texture_twiddle = GL_FALSE;
glKosInitEx(&config);
gpu_initialized() = true;
/* Close the window / shut the PVR down once, when the process exits. */
atexit(GLTestCase::shutdown_gpu_at_exit);
}
/* Return all GL state to a predictable baseline. This deliberately avoids
* the allocating _glInit* helpers (immediate-mode buffer, texture/named
* arrays, framebuffers) so it is safe to call repeatedly. */
void reset_gl_state() {
aligned_vector_clear(&OP_LIST.vector);
aligned_vector_clear(&PT_LIST.vector);
aligned_vector_clear(&TR_LIST.vector);
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);
glDisable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
glDisable(GL_LIGHTING);
glDisable(GL_FOG);
glDisable(GL_SCISSOR_TEST);
glDisable(GL_TEXTURE_TWIDDLE_KOS);
glBlendFunc(GL_ONE, GL_ZERO);
glDepthFunc(GL_LESS);
glShadeModel(GL_SMOOTH);
/* Restore the spec default so a test that changes pixel-store state
* doesn't leak into the next (we no longer re-init per test). */
glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
glBindTexture(GL_TEXTURE_2D, 0);
glMatrixMode(GL_PROJECTION); glLoadIdentity();
glMatrixMode(GL_MODELVIEW); glLoadIdentity();
glViewport(0, 0, 640, 480);
glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
glTexCoord2f(0.0f, 0.0f);
glNormal3f(0.0f, 0.0f, 1.0f);
ATTRIB_LIST.enabled = 0;
ATTRIB_LIST.dirty = ~0u;
_glGPUStateMarkDirty();
/* Drain any error raised while resetting. */
while(glGetError() != GL_NO_ERROR) {}
}
void set_up() {
ensure_gpu_initialized();
reset_gl_state();
}
void tear_down() {}
};

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/*
* Golden-image test harness for GLdc.
*
* GLdc has a "software" backend that, on the desktop, normally renders the
* submitted Tile-Accelerator (TA) poly-lists through SDL's GPU renderer. That
* path needs a display and is not deterministic across machines/SDL versions,
* so it is unsuitable for committed "golden" reference images.
*
* Instead this harness contains a tiny, fully self-contained, deterministic CPU
* rasteriser that consumes exactly the same poly-lists the real backend does
* (OP_LIST / PT_LIST / TR_LIST, filled by glEnd / glDrawArrays / ...). It
* reproduces the backend's triangle-strip walking (see SceneListFinish in
* GL/platforms/software.c) and the perspective divide it performs, then fills
* triangles with Gouraud-interpolated vertex colour, optionally modulated by a
* decoded texture. The result is compared against a committed PPM reference.
*
* Because the rasteriser lives here (not in the library) it never changes when
* the library changes, so a diff in the rendered output reliably indicates a
* regression in GLdc's transform / colour / clipping / submission pipeline.
*
* Determinism notes:
* - Pure float maths, pixel-centre sampling, top-left-ish fill rule.
* - Painter's-order compositing (matching the software backend, which does
* no depth buffering): later triangles overwrite earlier ones for opaque
* lists; the transparent list alpha-blends.
* - Comparison is tolerant (per-channel + mismatch-fraction thresholds) so
* sub-LSB rounding differences between compilers do not cause flakiness,
* while real geometry/colour regressions are still caught.
*
* Usage from a test:
* golden::Image img(64, 64);
* img.clear(0, 0, 0);
* ... GL draw calls ...
* golden::rasterize_all_lists(img); // or rasterize_list(...)
* assert_true(golden::check(img, "name")); // compares tests/goldens/name.ppm
*
* Set the environment variable GLDC_UPDATE_GOLDENS=1 to (re)generate references.
* On a mismatch the actual and diff images are written next to the golden with
* .actual.ppm / .diff.ppm suffixes for inspection.
*/
#pragma once
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <string>
#include <vector>
#include "GL/private.h"
#include "GL/platform.h"
#include "containers/aligned_vector.h"
#ifndef GLDC_GOLDEN_DIR
/* Fallback; the real value is injected by CMake as a compile definition. */
#define GLDC_GOLDEN_DIR "goldens"
#endif
namespace golden {
/* ------------------------------------------------------------------ Image */
struct Image {
int w;
int h;
std::vector<uint8_t> rgb; /* w*h*3, row-major, top row first */
Image(int width, int height) : w(width), h(height), rgb(size_t(width) * height * 3, 0) {}
void clear(uint8_t r, uint8_t g, uint8_t b) {
for(size_t i = 0; i < rgb.size(); i += 3) {
rgb[i + 0] = r;
rgb[i + 1] = g;
rgb[i + 2] = b;
}
}
inline void put(int x, int y, uint8_t r, uint8_t g, uint8_t b) {
if(x < 0 || y < 0 || x >= w || y >= h) return;
size_t i = (size_t(y) * w + x) * 3;
rgb[i + 0] = r;
rgb[i + 1] = g;
rgb[i + 2] = b;
}
inline void get(int x, int y, uint8_t& r, uint8_t& g, uint8_t& b) const {
size_t i = (size_t(y) * w + x) * 3;
r = rgb[i + 0];
g = rgb[i + 1];
b = rgb[i + 2];
}
};
/* -------------------------------------------------------------------- PPM */
inline bool write_ppm(const std::string& path, const Image& img) {
FILE* f = fopen(path.c_str(), "wb");
if(!f) return false;
fprintf(f, "P6\n%d %d\n255\n", img.w, img.h);
fwrite(img.rgb.data(), 1, img.rgb.size(), f);
fclose(f);
return true;
}
inline bool read_ppm(const std::string& path, Image& out) {
FILE* f = fopen(path.c_str(), "rb");
if(!f) return false;
char magic[3] = {0};
int w = 0, h = 0, maxv = 0;
if(fscanf(f, "%2s", magic) != 1 || strcmp(magic, "P6") != 0) { fclose(f); return false; }
if(fscanf(f, "%d %d %d", &w, &h, &maxv) != 3) { fclose(f); return false; }
fgetc(f); /* single whitespace after the header */
out = Image(w, h);
size_t got = fread(out.rgb.data(), 1, out.rgb.size(), f);
fclose(f);
return got == out.rgb.size();
}
/* ------------------------------------------------------- Texture decoding */
/* Decodes one texel of a non-twiddled 16bpp DC texture to RGBA 0-255.
* Only the formats useful for golden tests are supported; everything else
* falls back to opaque white so the modulate path still produces vertex
* colour. Twiddled/compressed/paletted formats should be exercised by the
* byte-exact texture-loading unit tests instead. */
struct Texel { uint8_t r, g, b, a; };
inline Texel decode_texel(const TextureObject* tex, int x, int y) {
Texel out = {255, 255, 255, 255};
if(!tex || !tex->data) return out;
const int w = tex->width;
const uint16_t* px = (const uint16_t*) tex->data;
uint16_t v = px[size_t(y) * w + x];
switch(tex->internalFormat) {
case GL_RGB565_KOS: {
uint8_t r5 = (v >> 11) & 0x1f, g6 = (v >> 5) & 0x3f, b5 = v & 0x1f;
out.r = (r5 << 3) | (r5 >> 2);
out.g = (g6 << 2) | (g6 >> 4);
out.b = (b5 << 3) | (b5 >> 2);
out.a = 255;
} break;
case GL_ARGB4444_KOS: {
uint8_t a4 = (v >> 12) & 0xf, r4 = (v >> 8) & 0xf, g4 = (v >> 4) & 0xf, b4 = v & 0xf;
out.a = (a4 << 4) | a4;
out.r = (r4 << 4) | r4;
out.g = (g4 << 4) | g4;
out.b = (b4 << 4) | b4;
} break;
case GL_ARGB1555_KOS: {
uint8_t a1 = (v >> 15) & 0x1, r5 = (v >> 10) & 0x1f, g5 = (v >> 5) & 0x1f, b5 = v & 0x1f;
out.a = a1 ? 255 : 0;
out.r = (r5 << 3) | (r5 >> 2);
out.g = (g5 << 3) | (g5 >> 2);
out.b = (b5 << 3) | (b5 >> 2);
} break;
default:
break; /* unsupported -> white */
}
return out;
}
/* ------------------------------------------------------------- Rasteriser */
struct RVertex {
float x, y; /* screen space (post perspective divide) */
float a, r, g, b; /* 0-1 */
float u, v; /* texture coords */
};
inline float edge(const RVertex& a, const RVertex& b, float px, float py) {
return (px - a.x) * (b.y - a.y) - (py - a.y) * (b.x - a.x);
}
inline int wrap_coord(int c, int n) {
c %= n;
if(c < 0) c += n;
return c;
}
inline void fill_triangle(Image& img, const RVertex& v0, const RVertex& v1,
const RVertex& v2, const TextureObject* tex, bool blend) {
float area = edge(v0, v1, v2.x, v2.y);
if(fabsf(area) < 1e-6f) return; /* degenerate */
float inv_area = 1.0f / area;
int minx = (int) floorf(fminf(v0.x, fminf(v1.x, v2.x)));
int maxx = (int) ceilf (fmaxf(v0.x, fmaxf(v1.x, v2.x)));
int miny = (int) floorf(fminf(v0.y, fminf(v1.y, v2.y)));
int maxy = (int) ceilf (fmaxf(v0.y, fmaxf(v1.y, v2.y)));
if(minx < 0) minx = 0;
if(miny < 0) miny = 0;
if(maxx > img.w) maxx = img.w;
if(maxy > img.h) maxy = img.h;
for(int y = miny; y < maxy; ++y) {
float py = y + 0.5f;
for(int x = minx; x < maxx; ++x) {
float px = x + 0.5f;
float w0 = edge(v1, v2, px, py) * inv_area;
float w1 = edge(v2, v0, px, py) * inv_area;
float w2 = edge(v0, v1, px, py) * inv_area;
/* Inside test that accepts either winding (no culling, like the
* software backend). */
bool inside = (w0 >= 0 && w1 >= 0 && w2 >= 0) ||
(w0 <= 0 && w1 <= 0 && w2 <= 0);
if(!inside) continue;
float a = w0 * v0.a + w1 * v1.a + w2 * v2.a;
float r = w0 * v0.r + w1 * v1.r + w2 * v2.r;
float g = w0 * v0.g + w1 * v1.g + w2 * v2.g;
float b = w0 * v0.b + w1 * v1.b + w2 * v2.b;
if(tex) {
float u = w0 * v0.u + w1 * v1.u + w2 * v2.u;
float v = w0 * v0.v + w1 * v1.v + w2 * v2.v;
int tx = wrap_coord((int) floorf(u * tex->width), tex->width);
int ty = wrap_coord((int) floorf(v * tex->height), tex->height);
Texel t = decode_texel(tex, tx, ty);
r *= t.r / 255.0f;
g *= t.g / 255.0f;
b *= t.b / 255.0f;
a *= t.a / 255.0f;
}
a = a < 0 ? 0 : (a > 1 ? 1 : a);
r = r < 0 ? 0 : (r > 1 ? 1 : r);
g = g < 0 ? 0 : (g > 1 ? 1 : g);
b = b < 0 ? 0 : (b > 1 ? 1 : b);
uint8_t sr = (uint8_t) lrintf(r * 255.0f);
uint8_t sg = (uint8_t) lrintf(g * 255.0f);
uint8_t sb = (uint8_t) lrintf(b * 255.0f);
if(blend) {
uint8_t dr, dg, db;
img.get(x, y, dr, dg, db);
sr = (uint8_t) lrintf(sr * a + dr * (1.0f - a));
sg = (uint8_t) lrintf(sg * a + dg * (1.0f - a));
sb = (uint8_t) lrintf(sb * a + db * (1.0f - a));
}
img.put(x, y, sr, sg, sb);
}
}
}
inline RVertex to_screen(const Vertex* v) {
/* Reproduce the software backend perspective divide (see
* _glPerspectiveDivideVertex). Vertices in the lists are already viewport
* transformed, so dividing x/y by w gives window coordinates. */
float inv_w = (v->w != 0.0f) ? 1.0f / v->w : 1.0f;
RVertex out;
out.x = v->xyz[0] * inv_w;
out.y = v->xyz[1] * inv_w;
out.a = v->argb[0];
out.r = v->argb[1];
out.g = v->argb[2];
out.b = v->argb[3];
out.u = v->uv[0];
out.v = v->uv[1];
return out;
}
/* Rasterise a single poly list. Triangle-strip extraction mirrors
* SceneListFinish() exactly so the same triangles are produced. */
inline void rasterize_list(Image& img, PolyList* list, const TextureObject* tex, bool blend) {
uint32_t n = aligned_vector_size(&list->vector);
if(n < 4) return;
uint32_t vidx = 0;
for(uint32_t i = 0; i < n; ++i) {
Vertex* v = (Vertex*) aligned_vector_at(&list->vector, i);
if((v->flags & GPU_CMD_POLYHDR) == GPU_CMD_POLYHDR) {
vidx = 0;
continue;
}
if(v->flags == GPU_CMD_VERTEX || v->flags == GPU_CMD_VERTEX_EOL) {
++vidx;
}
if(vidx > 2) {
Vertex* a = (Vertex*) aligned_vector_at(&list->vector, i - 2);
Vertex* b = (Vertex*) aligned_vector_at(&list->vector, i - 1);
RVertex r0 = to_screen(a);
RVertex r1 = to_screen(b);
RVertex r2 = to_screen(v);
fill_triangle(img, r0, r1, r2, tex, blend);
}
if(v->flags == GPU_CMD_VERTEX_EOL) {
vidx = 0;
}
}
}
/* Convenience: rasterise the opaque, punch-through and transparent lists in
* the order the backend submits them. */
inline void rasterize_all_lists(Image& img, const TextureObject* tex = NULL) {
rasterize_list(img, &OP_LIST, tex, false);
rasterize_list(img, &PT_LIST, tex, false);
rasterize_list(img, &TR_LIST, tex, true);
}
/* ------------------------------------------------------------- Comparison */
inline std::string golden_path(const std::string& name, const char* suffix = "") {
return std::string(GLDC_GOLDEN_DIR) + "/" + name + suffix + ".ppm";
}
/* Compare img against the committed golden. Returns true on match (or when a
* golden was just (re)generated). max_channel_diff is the largest per-channel
* absolute difference tolerated per pixel; max_bad_fraction is the fraction of
* pixels allowed to exceed that. */
inline bool check(const Image& img, const std::string& name,
int max_channel_diff = 2, double max_bad_fraction = 0.005) {
std::string path = golden_path(name);
const char* update = getenv("GLDC_UPDATE_GOLDENS");
Image golden(0, 0);
bool have_golden = read_ppm(path, golden);
if((update && update[0] == '1') || !have_golden) {
if(!write_ppm(path, img)) {
fprintf(stderr, "golden: failed to write %s\n", path.c_str());
return false;
}
fprintf(stderr, "golden: generated reference %s\n", path.c_str());
return true;
}
if(golden.w != img.w || golden.h != img.h) {
fprintf(stderr, "golden: size mismatch for %s (%dx%d vs %dx%d)\n",
name.c_str(), golden.w, golden.h, img.w, img.h);
write_ppm(golden_path(name, ".actual"), img);
return false;
}
size_t bad = 0;
int worst = 0;
Image diff(img.w, img.h);
for(size_t i = 0; i < img.rgb.size(); i += 3) {
int dr = abs(int(img.rgb[i + 0]) - int(golden.rgb[i + 0]));
int dg = abs(int(img.rgb[i + 1]) - int(golden.rgb[i + 1]));
int db = abs(int(img.rgb[i + 2]) - int(golden.rgb[i + 2]));
int d = dr > dg ? (dr > db ? dr : db) : (dg > db ? dg : db);
if(d > worst) worst = d;
if(d > max_channel_diff) {
++bad;
diff.rgb[i + 0] = 255; /* highlight differing pixels in red */
}
}
size_t total = img.rgb.size() / 3;
double frac = double(bad) / double(total);
if(frac > max_bad_fraction) {
fprintf(stderr,
"golden: MISMATCH %s — %zu/%zu px differ (%.3f%%), worst channel diff %d\n",
name.c_str(), bad, total, frac * 100.0, worst);
write_ppm(golden_path(name, ".actual"), img);
write_ppm(golden_path(name, ".diff"), diff);
return false;
}
return true;
}
} // namespace golden

5
tools/test.h
View File

@ -351,7 +351,10 @@ public:
output += " "; output += " ";
} }
std::cout << output; /* Flush the name before running so that, if a test hard-crashes
* (e.g. on real Dreamcast hardware), the last line printed
* identifies the offending test. */
std::cout << output << std::flush;
test(); test();
std::cout << "\033[32m" << " OK " << "\033[0m" << std::endl; std::cout << "\033[32m" << " OK " << "\033[0m" << std::endl;
junit_lines.push_back(" </testcase>\n"); junit_lines.push_back(" </testcase>\n");

2
tools/test_generator.py
View File

@ -165,7 +165,7 @@ def find_tests(files):
# If this subclasses TestCase, or it subclasses any of the already found testcase subclasses # If this subclasses TestCase, or it subclasses any of the already found testcase subclasses
# then add it to the list # then add it to the list
if "TestCase" in subclass_names or "SimulantTestCase" in subclass_names or any(x[1] in subclasses[i][2] for x in test_case_subclasses): if "TestCase" in subclass_names or "SimulantTestCase" in subclass_names or "GLTestCase" in subclass_names or any(x[1] in subclasses[i][2] for x in test_case_subclasses):
if subclasses[i] not in test_case_subclasses: if subclasses[i] not in test_case_subclasses:
test_case_subclasses.append(subclasses[i]) test_case_subclasses.append(subclasses[i])