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174483941e
GLdc/GL/flush.c
Luke Benstead 174483941e First pass at all cases, clip100 working
2020-11-01 21:12:45 +00:00

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#include <kos.h>
#include <stdlib.h>
#include "../include/glkos.h"
#include "../containers/aligned_vector.h"
#include "private.h"
#include "profiler.h"
#include "version.h"
#include "flush.h"
#define CLIP_DEBUG 0
#define TA_SQ_ADDR (unsigned int *)(void *) \
(0xe0000000 | (((unsigned long)0x10000000) & 0x03ffffe0))
static PolyList OP_LIST;
static PolyList PT_LIST;
static PolyList TR_LIST;
static const int STRIDE = sizeof(Vertex) / sizeof(GLuint);
#define CLIP_TO_PLANE(vert1, vert2) \
do { \
float t = _glClipLineToNearZ((vert1), (vert2), out); \
interpolateVec2((vert1)->uv, (vert2)->uv, t, out->uv); \
interpolateVec3((vert1)->nxyz, (vert2)->nxyz, t, out->nxyz); \
interpolateVec2((vert1)->st, (vert2)->st, t, out->st); \
interpolateColour((vert1)->bgra, (vert2)->bgra, t, out->bgra); \
} while(0); \
GL_FORCE_INLINE float _glClipLineToNearZ(const Vertex* v1, const Vertex* v2, Vertex* vout) {
TRACE();
const float d0 = v1->w;
const float d1 = v2->w;
assert(isVisible(v1) ^ isVisible(v2));
/* We need to shift 't' a little, to avoid the possibility that a
* rounding error leaves the new vertex behind the near plane. We shift
* according to the direction we're clipping across the plane */
const float epsilon = (d0 < d1) ? 0.0000001 : -0.0000001;
float t = MATH_Fast_Divide(d0, (d0 - d1))+ epsilon;
vout->xyz[0] = MATH_fmac(v2->xyz[0] - v1->xyz[0], t, v1->xyz[0]);
vout->xyz[1] = MATH_fmac(v2->xyz[1] - v1->xyz[1], t, v1->xyz[1]);
vout->xyz[2] = MATH_fmac(v2->xyz[2] - v1->xyz[2], t, v1->xyz[2]);
vout->w = MATH_fmac(v2->w - v1->w, t, v1->w);
#if CLIP_DEBUG
printf(
"(%f, %f, %f, %f) -> %f -> (%f, %f, %f, %f) = (%f, %f, %f, %f)\n",
v1->xyz[0], v1->xyz[1], v1->xyz[2], v1->w, t,
v2->xyz[0], v2->xyz[1], v2->xyz[2], v2->w,
vout->xyz[0], vout->xyz[1], vout->xyz[2], vout->w
);
#endif
return t;
}
GL_FORCE_INLINE void interpolateFloat(const float v1, const float v2, const float t, float* out) {
*out = MATH_fmac(v2 - v1,t, v1);
}
GL_FORCE_INLINE void interpolateVec2(const float* v1, const float* v2, const float t, float* out) {
interpolateFloat(v1[0], v2[0], t, &out[0]);
interpolateFloat(v1[1], v2[1], t, &out[1]);
}
GL_FORCE_INLINE void interpolateVec3(const float* v1, const float* v2, const float t, float* out) {
interpolateFloat(v1[0], v2[0], t, &out[0]);
interpolateFloat(v1[1], v2[1], t, &out[1]);
interpolateFloat(v1[2], v2[2], t, &out[2]);
}
GL_FORCE_INLINE void interpolateVec4(const float* v1, const float* v2, const float t, float* out) {
interpolateFloat(v1[0], v2[0], t, &out[0]);
interpolateFloat(v1[1], v2[1], t, &out[1]);
interpolateFloat(v1[2], v2[2], t, &out[2]);
interpolateFloat(v1[3], v2[3], t, &out[3]);
}
GL_FORCE_INLINE void interpolateColour(const uint8_t* v1, const uint8_t* v2, const float t, uint8_t* out) {
out[0] = v1[0] + (uint32_t) (((float) (v2[0] - v1[0])) * t);
out[1] = v1[1] + (uint32_t) (((float) (v2[1] - v1[1])) * t);
out[2] = v1[2] + (uint32_t) (((float) (v2[2] - v1[2])) * t);
out[3] = v1[3] + (uint32_t) (((float) (v2[3] - v1[3])) * t);
}
static Vertex* interpolate_vertex(const Vertex* v0, const Vertex* v1, Vertex* out) {
/* If v0 is in front of the near plane, and v1 is behind the near plane, this
* generates a vertex *on* the near plane */
CLIP_TO_PLANE(v0, v1);
return out;
}
GL_FORCE_INLINE ListIterator* header_reset(ListIterator* it, Vertex* header) {
it->active = header;
it->visibility = 0;
it->triangle_count = 0;
it->stack_idx = -1;
return it;
}
GL_FORCE_INLINE Vertex* current_postinc(ListIterator* it) {
if(it->remaining == 0) {
return NULL;
}
it->remaining--;
Vertex* current = it->src;
it->src++;
return current;
}
GL_FORCE_INLINE Vertex* push_stack(ListIterator* it) {
#if CLIP_DEBUG
printf("Using stack: %d\n", it->stack_idx + 1);
#endif
assert(it->stack_idx + 1 < MAX_STACK);
return &it->stack[++it->stack_idx];
}
GL_FORCE_INLINE GLboolean shift(ListIterator* it, Vertex* new_vertex) {
TRACE();
/*
* Shifts in a new vertex, dropping the oldest. If
* new_vertex is NULL it will return GL_FALSE (but still
* shift) */
if(new_vertex) {
it->triangle_count++;
} else {
// We shifted a NULL, so we're reducing
// the available count rather than increasing
it->triangle_count--;
}
if(it->triangle_count > 3) {
it->triangle_count = 3;
}
it->triangle[0] = it->triangle[1];
it->triangle[1] = it->triangle[2];
it->triangle[2] = new_vertex;
it->visibility <<= 1;
it->visibility &= 7;
it->visibility += (new_vertex) ? isVisible(new_vertex) : 0;
return new_vertex != NULL;
}
static ListIterator* finish_clip(ListIterator* it) {
/* When we've clipped a triangle, we either need to reduce
* the triangle_count so that next iteration we move to the next
* triangle OR we need to shift away the vertices in the triangle
* buffer entirely so next iteration starts a new strip.
* FIXME: Do we need to swap the verts in the triangle buffer for winding? */
if(it->src && isVertex(it->src)) {
/* Continue */
it->triangle_count--;
} else {
/* Restart strip */
while(it->triangle_count) {
shift(it, NULL);
}
}
return it;
}
static ListIterator* clip100(ListIterator* it) {
#if CLIP_DEBUG
printf("clip100\n");
#endif
TRACE();
/* First visible only */
Vertex* gen3 = push_stack(it);
Vertex* gen2 = push_stack(it);
Vertex* gen1 = push_stack(it);
assert(gen1);
assert(gen2);
assert(gen3);
*gen1 = *it->triangle[0];
interpolate_vertex(it->triangle[0], it->triangle[1], gen2);
interpolate_vertex(it->triangle[0], it->triangle[2], gen3);
gen1->flags = PVR_CMD_VERTEX;
gen2->flags = PVR_CMD_VERTEX;
gen3->flags = PVR_CMD_VERTEX_EOL;
assert(gen1);
assert(gen2);
assert(gen3);
assert(isVisible(gen1));
assert(isVisible(gen2));
assert(isVisible(gen3));
assert(isVertex(gen1));
assert(isVertex(gen2));
assert(isVertex(gen3));
it->active = gen1;
return finish_clip(it);
}
static ListIterator* clip110(ListIterator* it) {
#if CLIP_DEBUG
printf("clip110\n");
#endif
TRACE();
/* First two visible. so we need to create 2 new vertices from
* A -> C, and B -> C. */
Vertex* gen2 = push_stack(it);
Vertex* gen1 = push_stack(it);
Vertex* cpy = push_stack(it);
gen1->flags = PVR_CMD_VERTEX;
gen2->flags = PVR_CMD_VERTEX_EOL;
interpolate_vertex(it->triangle[0], it->triangle[2], gen1);
interpolate_vertex(it->triangle[1], it->triangle[2], gen2);
assert(isVisible(gen1));
assert(isVisible(gen2));
assert(isVertex(gen1));
assert(isVertex(gen2));
/* We copy vertex B, so that things are returned in order */
*cpy = *it->triangle[1];
/* Return A */
it->active = it->triangle[0];
return finish_clip(it);
}
static ListIterator* clip101(ListIterator* it) {
#if CLIP_DEBUG
printf("clip101\n");
#endif
TRACE();
/* First visible and last visible. Need to create two
* vertices in between first and last! */
Vertex* gen4 = push_stack(it);
Vertex* gen3 = push_stack(it);
Vertex* gen2 = push_stack(it);
Vertex* gen1 = push_stack(it);
/* First and last need to be the same*/
*gen1 = *it->triangle[0];
*gen4 = *it->triangle[2];
gen1->flags = PVR_CMD_VERTEX;
gen2->flags = PVR_CMD_VERTEX;
gen3->flags = PVR_CMD_VERTEX;
gen4->flags = PVR_CMD_VERTEX_EOL; /* 4 is now last in the list */
interpolate_vertex(it->triangle[0], it->triangle[1], gen2);
interpolate_vertex(it->triangle[1], it->triangle[2], gen3);
it->active = it->triangle[0];
return finish_clip(it);
}
static ListIterator* clip011(ListIterator* it) {
#if CLIP_DEBUG
printf("clip011\n");
#endif
TRACE();
/* Last two visible, we need to create two new vertices */
Vertex* gen4 = push_stack(it);
Vertex* gen3 = push_stack(it);
Vertex* gen2 = push_stack(it);
Vertex* gen1 = push_stack(it);
*gen3 = *it->triangle[1];
*gen4 = *it->triangle[2];
gen1->flags = PVR_CMD_VERTEX;
gen2->flags = PVR_CMD_VERTEX;
gen3->flags = PVR_CMD_VERTEX;
gen4->flags = PVR_CMD_VERTEX_EOL; /* 4 is now last in the list */
interpolate_vertex(it->triangle[0], it->triangle[1], gen1);
interpolate_vertex(it->triangle[2], it->triangle[0], gen2);
it->active = it->triangle[0];
return finish_clip(it);
}
static ListIterator* clip001(ListIterator* it) {
#if CLIP_DEBUG
printf("clip001\n");
#endif
TRACE();
/* Last visible? Just replace the first two vertices */
Vertex* gen3 = push_stack(it);
Vertex* gen2 = push_stack(it);
Vertex* gen1 = push_stack(it);
*gen3 = *it->triangle[2];
gen1->flags = PVR_CMD_VERTEX;
gen2->flags = PVR_CMD_VERTEX;
gen3->flags = PVR_CMD_VERTEX_EOL;
interpolate_vertex(it->triangle[0], it->triangle[2], gen1);
interpolate_vertex(it->triangle[2], it->triangle[1], gen2);
it->active = it->triangle[0];
return finish_clip(it);
}
static ListIterator* clip010(ListIterator* it) {
#if CLIP_DEBUG
printf("clip010\n");
#endif
TRACE();
/* First and last need replacing */
Vertex* gen3 = push_stack(it);
Vertex* gen2 = push_stack(it);
Vertex* gen1 = push_stack(it);
*gen2 = *it->triangle[1];
gen1->flags = PVR_CMD_VERTEX;
gen2->flags = PVR_CMD_VERTEX;
gen3->flags = PVR_CMD_VERTEX_EOL;
interpolate_vertex(it->triangle[0], it->triangle[1], gen1);
interpolate_vertex(it->triangle[1], it->triangle[2], gen3);
it->active = it->triangle[0];
return finish_clip(it);
}
ListIterator* _glIteratorNext(ListIterator* it) {
TRACE();
/* Return any vertices we generated */
if(it->stack_idx > -1) {
#if CLIP_DEBUG
printf("Yielding stack: %d\n", it->stack_idx);
#endif
it->active = &it->stack[it->stack_idx--];
return it;
}
/* None remaining in the list, and the stack is empty */
if(!it->remaining && !it->triangle_count) {
return NULL;
}
_Bool retry = 1;
while(retry) {
retry = 0;
_Bool is_header = !isVertex(it->src);
/* If we hit a header, and we have vertices still
* not returned, shift them out and return them */
if(is_header && it->triangle_count) {
shift(it, NULL);
it->active = it->triangle[0];
return it;
} else if(is_header) {
return header_reset(it, current_postinc(it));
} else {
/* Make sure we have a full triangle of vertices */
while(it->triangle_count < 3) {
if(!shift(it, current_postinc(it))) {
return NULL;
}
}
/* OK, by this point we should have info for a complete triangle
* including visibility */
switch(it->visibility) {
case B111:
#if CLIP_DEBUG
printf("111\n");
#endif
/* Totally visible, return the first vertex */
it->active = it->triangle[0];
it->triangle_count--;
return it;
break;
case B100: {
return clip100(it);
} break;
case B101: {
return clip101(it);
} break;
case B110: {
return clip110(it);
} break;
case B011: {
return clip011(it);
} break;
case B001: {
return clip001(it);
} break;
case B010: {
return clip010(it);
} break;
case B000: {
#if CLIP_DEBUG
printf("000\n");
#endif
/* If a triangle is invisible, there are 3 situations:
*
* 1. It's the last triangle, so we end here
* 2. It was the last triangle before a header, in which
* case we return the header
* 3. It was not the last triangle in the strip, so we just
* go around again to shift the next vertex (we don't return
* anything because it's invisible...) */
if(!it->remaining) {
return NULL;
} else if(!isVertex(it->src)) {
return header_reset(it, current_postinc(it));
} else {
it->triangle_count--;
retry = 1;
}
} break;
default:
break; // Impossible
}
}
}
return NULL;
}
GL_FORCE_INLINE void perspective_divide(Vertex* vertex) {
float f = MATH_Fast_Invert(vertex->w);
vertex->xyz[0] *= f;
vertex->xyz[1] *= f;
vertex->xyz[2] *= f;
vertex->xyz[2] = MAX(1.0f - (vertex->xyz[2] * 0.5f + 0.5f), 0.0001f);
}
static void pvr_list_submit(void *src, int n) {
GLuint *d = TA_SQ_ADDR;
/* First entry is assumed to always be a header and therefore
* always submitted (e.g. not clipped) */
ListIterator* it = _glIteratorBegin(src, n);
/* fill/write queues as many times necessary */
while(it) {
__asm__("pref @%0" : : "r"(it->active + 1)); /* prefetch 64 bytes for next loop */
if(isVertex(it->active)) {
perspective_divide(it->active);
}
GLuint* s = (GLuint*) it->active;
d[0] = *(s++);
d[1] = *(s++);
d[2] = *(s++);
d[3] = *(s++);
d[4] = *(s++);
d[5] = *(s++);
d[6] = *(s++);
d[7] = *(s++);
/* This prefetch actually commits 32 bytes to the SQ */
__asm__("pref @%0" : : "r"(d));
d += 8; /* Move to the next SQ address */
it = _glIteratorNext(it);
}
/* Wait for both store queues to complete */
d = (GLuint *)0xe0000000;
d[0] = d[8] = 0;
free(it);
}
static void _glInitPVR(GLboolean autosort, GLboolean fsaa) {
pvr_init_params_t params = {
/* Enable opaque and translucent polygons with size 32 and 32 */
{PVR_BINSIZE_32, PVR_BINSIZE_0, PVR_BINSIZE_32, PVR_BINSIZE_0, PVR_BINSIZE_32},
PVR_VERTEX_BUF_SIZE, /* Vertex buffer size */
0, /* No DMA */
fsaa,
(autosort) ? 0 : 1
};
pvr_init(&params);
}
PolyList* _glActivePolyList() {
if(_glIsBlendingEnabled()) {
return &TR_LIST;
} else if(_glIsAlphaTestEnabled()) {
return &PT_LIST;
} else {
return &OP_LIST;
}
}
PolyList *_glTransparentPolyList() {
return &TR_LIST;
}
void APIENTRY glFlush() {
}
void APIENTRY glFinish() {
}
void APIENTRY glKosInitConfig(GLdcConfig* config) {
config->autosort_enabled = GL_FALSE;
config->fsaa_enabled = GL_FALSE;
config->initial_op_capacity = 1024;
config->initial_pt_capacity = 512;
config->initial_tr_capacity = 1024;
config->initial_immediate_capacity = 1024;
config->internal_palette_format = GL_RGBA4;
}
void APIENTRY glKosInitEx(GLdcConfig* config) {
TRACE();
printf("\nWelcome to GLdc! Git revision: %s\n\n", GLDC_VERSION);
_glInitPVR(config->autosort_enabled, config->fsaa_enabled);
_glInitMatrices();
_glInitAttributePointers();
_glInitContext();
_glInitLights();
_glInitImmediateMode(config->initial_immediate_capacity);
_glInitFramebuffers();
_glSetInternalPaletteFormat(config->internal_palette_format);
_glInitTextures();
OP_LIST.list_type = PVR_LIST_OP_POLY;
PT_LIST.list_type = PVR_LIST_PT_POLY;
TR_LIST.list_type = PVR_LIST_TR_POLY;
aligned_vector_init(&OP_LIST.vector, sizeof(Vertex));
aligned_vector_init(&PT_LIST.vector, sizeof(Vertex));
aligned_vector_init(&TR_LIST.vector, sizeof(Vertex));
aligned_vector_reserve(&OP_LIST.vector, config->initial_op_capacity);
aligned_vector_reserve(&PT_LIST.vector, config->initial_pt_capacity);
aligned_vector_reserve(&TR_LIST.vector, config->initial_tr_capacity);
}
void APIENTRY glKosInit() {
GLdcConfig config;
glKosInitConfig(&config);
glKosInitEx(&config);
}
#define QACRTA ((((unsigned int)0x10000000)>>26)<<2)&0x1c
void APIENTRY glKosSwapBuffers() {
static int frame_count = 0;
TRACE();
profiler_push(__func__);
pvr_wait_ready();
pvr_scene_begin();
QACR0 = QACRTA;
QACR1 = QACRTA;
pvr_list_begin(PVR_LIST_OP_POLY);
pvr_list_submit(OP_LIST.vector.data, OP_LIST.vector.size);
pvr_list_finish();
pvr_list_begin(PVR_LIST_PT_POLY);
pvr_list_submit(PT_LIST.vector.data, PT_LIST.vector.size);
pvr_list_finish();
pvr_list_begin(PVR_LIST_TR_POLY);
pvr_list_submit(TR_LIST.vector.data, TR_LIST.vector.size);
pvr_list_finish();
pvr_scene_finish();
aligned_vector_clear(&OP_LIST.vector);
aligned_vector_clear(&PT_LIST.vector);
aligned_vector_clear(&TR_LIST.vector);
profiler_checkpoint("scene");
profiler_pop();
if(frame_count++ > 100) {
profiler_print_stats();
frame_count = 0;
}
}
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