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Merge branch 'ext-paletted-texture' into 'master'

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Initial implementation of GL_EXT_paletted_texture

See merge request simulant/GLdc!26
This commit is contained in:
Luke Benstead 2019-02-21 21:29:42 +00:00
commit 3d5b257e1b
12 changed files with 577 additions and 34 deletions
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11
GL/private.h
View File

@ -41,6 +41,14 @@ typedef struct {
AlignedVector vector;
} PolyList;
typedef struct {
/* Palette data is always stored in RAM as RGBA8888 and packed as ARGB8888
* when uploaded to the PVR */
GLubyte* data;
GLushort width;
GLenum format;
} TexturePalette;
typedef struct {
GLushort width;
GLushort height;
@ -57,6 +65,9 @@ typedef struct {
GLenum magFilter;
GLboolean isCompressed;
GLboolean isPaletted;
TexturePalette* palette;
} TextureObject;
typedef struct {

2
GL/state.c
View File

@ -601,7 +601,7 @@ const GLbyte *glGetString(GLenum name) {
return "GLdc 1.x";
case GL_EXTENSIONS:
return "GL_ARB_framebuffer_object, GL_ARB_multitexture, GL_ARB_texture_rg";
return "GL_ARB_framebuffer_object, GL_ARB_multitexture, GL_ARB_texture_rg, GL_EXT_paletted_texture";
}
return "GL_KOS_ERROR: ENUM Unsupported\n";

272
GL/texture.c
View File

@ -2,6 +2,8 @@
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include "../include/glext.h"
#include "../include/glkos.h"
@ -17,6 +19,28 @@ static GLubyte ACTIVE_TEXTURE = 0;
static GLuint _determinePVRFormat(GLint internalFormat, GLenum type);
#define PACK_ARGB8888(a,r,g,b) ( ((a & 0xFF) << 24) | ((r & 0xFF) << 16) | ((g & 0xFF) << 8) | (b & 0xFF) )
static void _glApplyColorTable() {
TextureObject* active = getBoundTexture();
if(!active) {
return; //? Unload the palette? Make White?
}
if(!active->palette || !active->palette->data) {
return;
}
pvr_set_pal_format(PVR_PAL_ARGB8888);
GLushort i = 0;
for(; i < active->palette->width; ++i) {
GLubyte* entry = &active->palette->data[i * 4];
pvr_set_pal_entry(i, PACK_ARGB8888(entry[3], entry[1], entry[2], entry[0]));
}
}
GLubyte _glGetActiveTexture() {
return ACTIVE_TEXTURE;
}
@ -141,6 +165,9 @@ void APIENTRY glGenTextures(GLsizei n, GLuint *textures) {
txr->mipmapCount = 0;
txr->minFilter = GL_NEAREST;
txr->magFilter = GL_NEAREST;
txr->palette = NULL;
txr->isCompressed = GL_FALSE;
txr->isPaletted = GL_FALSE;
*textures = id;
@ -166,6 +193,16 @@ void APIENTRY glDeleteTextures(GLsizei n, GLuint *textures) {
txr->data = NULL;
}
if(txr->palette && txr->palette->data) {
free(txr->palette->data);
txr->palette->data = NULL;
}
if(txr->palette) {
free(txr->palette);
txr->palette = NULL;
}
named_array_release(&TEXTURE_OBJECTS, *textures++);
}
}
@ -181,6 +218,9 @@ void APIENTRY glBindTexture(GLenum target, GLuint texture) {
if(texture) {
TEXTURE_UNITS[ACTIVE_TEXTURE] = (TextureObject*) named_array_get(&TEXTURE_OBJECTS, texture);
// If this is a paletted texture, we need to reapply the color table
_glApplyColorTable();
} else {
TEXTURE_UNITS[ACTIVE_TEXTURE] = NULL;
}
@ -245,13 +285,13 @@ void APIENTRY glCompressedTexImage2DARB(GLenum target,
GLint w = width;
if(w < 8 || (w & -w) != w) {
/* Width is not a power of two. Must be!*/
_glKosThrowError(GL_INVALID_VALUE, "glTexImage2D");
_glKosThrowError(GL_INVALID_VALUE, __func__);
}
GLint h = height;
if(h < 8 || (h & -h) != h) {
/* Height is not a power of two. Must be!*/
_glKosThrowError(GL_INVALID_VALUE, "glTexImage2D");
_glKosThrowError(GL_INVALID_VALUE, __func__);
}
if(level || border) {
@ -332,6 +372,8 @@ void APIENTRY glCompressedTexImage2DARB(GLenum target,
static GLint _cleanInternalFormat(GLint internalFormat) {
switch (internalFormat) {
case GL_COLOR_INDEX8_EXT:
return GL_COLOR_INDEX8_EXT;
case GL_ALPHA:
/* case GL_ALPHA4:
case GL_ALPHA8:
@ -363,24 +405,24 @@ static GLint _cleanInternalFormat(GLint internalFormat) {
case 3:
return GL_RGB;
case GL_RGB:
/* case GL_R3_G3_B2:
/* case GL_R3_G3_B2: */
case GL_RGB4:
case GL_RGB5:
case GL_RGB8:
case GL_RGB10:
case GL_RGB12:
case GL_RGB16: */
case GL_RGB16:
return GL_RGB;
case 4:
return GL_RGBA;
case GL_RGBA:
/* case GL_RGBA2:
case GL_RGBA2:
case GL_RGBA4:
case GL_RGB5_A1:
case GL_RGBA8:
case GL_RGB10_A2:
case GL_RGBA12:
case GL_RGBA16: */
case GL_RGBA16:
return GL_RGBA;
/* Support ARB_texture_rg */
@ -450,33 +492,69 @@ static GLuint _determinePVRFormat(GLint internalFormat, GLenum type) {
case GL_COMPRESSED_ARGB_1555_VQ_TWID_KOS:
case GL_COMPRESSED_ARGB_1555_VQ_MIPMAP_TWID_KOS:
return PVR_TXRFMT_ARGB1555 | PVR_TXRFMT_TWIDDLED | PVR_TXRFMT_VQ_ENABLE;
case GL_COLOR_INDEX8_EXT:
return PVR_TXRFMT_PAL8BPP;
default:
return 0;
}
}
typedef void (*TextureConversionFunc)(const GLubyte*, GLushort*);
typedef void (*TextureConversionFunc)(const GLubyte*, GLubyte*);
static void _rgba8888_to_argb4444(const GLubyte* source, GLushort* dest) {
*dest = (source[3] & 0xF0) << 8 | (source[0] & 0xF0) << 4 | (source[1] & 0xF0) | (source[2] & 0xF0) >> 4;
static inline void _rgba8888_to_argb4444(const GLubyte* source, GLubyte* dest) {
*((GLushort*) dest) = (source[3] & 0xF0) << 8 | (source[0] & 0xF0) << 4 | (source[1] & 0xF0) | (source[2] & 0xF0) >> 4;
}
static void _rgb888_to_rgb565(const GLubyte* source, GLushort* dest) {
*dest = ((source[0] & 0b11111000) << 8) | ((source[1] & 0b11111100) << 3) | (source[2] >> 3);
static inline void _rgba8888_to_rgba8888(const GLubyte* source, GLubyte* dest) {
/* Noop */
GLubyte* dst = (GLubyte*) dest;
dst[0] = source[0];
dst[1] = source[1];
dst[2] = source[2];
dst[3] = source[3];
}
static void _rgba8888_to_a000(const GLubyte* source, GLushort* dest) {
*dest = ((source[3] & 0b11111000) << 8);
static inline void _rgb888_to_rgba8888(const GLubyte* source, GLubyte* dest) {
/* Noop */
GLubyte* dst = (GLubyte*) dest;
dst[0] = source[0];
dst[1] = source[1];
dst[2] = source[2];
dst[3] = 255;
}
static void _r8_to_rgb565(const GLubyte* source, GLushort* dest) {
*dest = (source[0] & 0b11111000) << 8;
static inline void _rgb888_to_rgb565(const GLubyte* source, GLubyte* dest) {
*((GLushort*) dest) = ((source[0] & 0b11111000) << 8) | ((source[1] & 0b11111100) << 3) | (source[2] >> 3);
}
static void _rgba4444_to_argb4444(const GLubyte* source, GLushort* dest) {
static inline void _rgba8888_to_a000(const GLubyte* source, GLubyte* dest) {
*((GLushort*) dest) = ((source[3] & 0b11111000) << 8);
}
static inline void _r8_to_rgb565(const GLubyte* source, GLubyte* dest) {
*((GLushort*) dest) = (source[0] & 0b11111000) << 8;
}
static inline void _rgba4444_to_argb4444(const GLubyte* source, GLubyte* dest) {
GLushort* src = (GLushort*) source;
*dest = ((*src & 0x000F) << 12) | *src >> 4;
*((GLushort*) dest) = ((*src & 0x000F) << 12) | *src >> 4;
}
static inline void _rgba4444_to_rgba8888(const GLubyte* source, GLubyte* dest) {
GLushort src = *((GLushort*) source);
GLubyte* dst = (GLubyte*) dest;
dst[0] = ((src & 0xF000) >> 12) * 2;
dst[1] = ((src & 0x0F00) >> 8) * 2;
dst[2] = ((src & 0x00F0) >> 4) * 2;
dst[3] = ((src & 0x000F)) * 2;
}
static inline void _i8_to_i8(const GLubyte* source, GLubyte* dest) {
/* For indexes */
GLubyte* dst = (GLubyte*) dest;
*dst = *source;
}
static TextureConversionFunc _determineConversion(GLint internalFormat, GLenum format, GLenum type) {
@ -512,6 +590,30 @@ static TextureConversionFunc _determineConversion(GLint internalFormat, GLenum f
return _rgba4444_to_argb4444;
}
} break;
case GL_RGBA8: {
if(type == GL_UNSIGNED_BYTE && format == GL_RGBA) {
return _rgba8888_to_rgba8888;
} else if (type == GL_BYTE && format == GL_RGBA) {
return _rgba8888_to_rgba8888;
} else if(type == GL_UNSIGNED_BYTE && format == GL_RGB) {
return _rgb888_to_rgba8888;
} else if (type == GL_BYTE && format == GL_RGB) {
return _rgb888_to_rgba8888;
} else if(type == GL_UNSIGNED_SHORT_4_4_4_4 && format == GL_RGBA) {
return _rgba4444_to_rgba8888;
}
} break;
case GL_COLOR_INDEX8_EXT:
if(format == GL_COLOR_INDEX) {
switch(type) {
case GL_BYTE:
case GL_UNSIGNED_BYTE:
return _i8_to_i8;
default:
break;
}
}
break;
default:
fprintf(stderr, "Unsupported conversion: %x -> %x, %x\n", internalFormat, format, type);
break;
@ -525,6 +627,7 @@ static GLboolean _isSupportedFormat(GLenum format) {
case GL_RGB:
case GL_RGBA:
case GL_BGRA:
case GL_COLOR_INDEX:
return GL_TRUE;
default:
return GL_FALSE;
@ -556,6 +659,7 @@ void APIENTRY glTexImage2D(GLenum target, GLint level, GLint internalFormat,
_glKosThrowError(GL_INVALID_ENUM, "glTexImage2D");
}
if(format != GL_COLOR_INDEX) {
if(!_isSupportedFormat(format)) {
_glKosThrowError(GL_INVALID_ENUM, "glTexImage2D");
}
@ -569,6 +673,11 @@ void APIENTRY glTexImage2D(GLenum target, GLint level, GLint internalFormat,
if(internalFormat == -1) {
_glKosThrowError(GL_INVALID_VALUE, "glTexImage2D");
}
} else {
if(internalFormat != GL_COLOR_INDEX8_EXT) {
_glKosThrowError(GL_INVALID_ENUM, __func__);
}
}
GLint w = width;
if(w < 8 || (w & -w) != w) {
@ -594,6 +703,13 @@ void APIENTRY glTexImage2D(GLenum target, GLint level, GLint internalFormat,
_glKosThrowError(GL_INVALID_OPERATION, "glTexImage2D");
}
GLboolean isPaletted = (internalFormat == GL_COLOR_INDEX8_EXT) ? GL_TRUE : GL_FALSE;
if(isPaletted && level > 0) {
/* Paletted textures can't have mipmaps */
_glKosThrowError(GL_INVALID_OPERATION, __func__);
}
if(_glKosHasError()) {
_glKosPrintError();
return;
@ -618,20 +734,34 @@ void APIENTRY glTexImage2D(GLenum target, GLint level, GLint internalFormat,
}
}
GLuint bytes = (width * height * sizeof(GLushort));
/* All colour formats are represented as shorts internally. Paletted textures
* are represented by byte indexes (which look up into a color table)
*/
GLint destStride = isPaletted ? 1 : 2;
GLuint bytes = (width * height * destStride);
if(!active->data) {
assert(active);
assert(width);
assert(height);
assert(destStride);
/* need texture memory */
active->width = width;
active->height = height;
active->color = pvr_format;
/* Set the required mipmap count */
active->mipmapCount = _glGetMipmapLevelCount(active);
active->dataStride = sizeof(GLshort);
active->dataStride = destStride;
GLuint size = _glGetMipmapDataSize(active);
assert(size);
active->data = pvr_mem_malloc(size);
assert(active->data);
active->isCompressed = GL_FALSE;
active->isPaletted = isPaletted;
}
/* Mark this level as set in the mipmap bitmask */
@ -644,7 +774,10 @@ void APIENTRY glTexImage2D(GLenum target, GLint level, GLint internalFormat,
* These are the only formats where the source format passed in matches the pvr format.
* Note the REV formats + GL_BGRA will reverse to ARGB which is what the PVR supports
*/
if(format == GL_BGRA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && internalFormat == GL_RGBA) {
if(format == GL_COLOR_INDEX) {
/* Don't convert color indexes */
needsConversion = GL_FALSE;
} else if(format == GL_BGRA && type == GL_UNSIGNED_SHORT_4_4_4_4_REV && internalFormat == GL_RGBA) {
needsConversion = GL_FALSE;
} else if(format == GL_BGRA && type == GL_UNSIGNED_SHORT_1_5_5_5_REV && internalFormat == GL_RGBA) {
needsConversion = GL_FALSE;
@ -659,6 +792,7 @@ void APIENTRY glTexImage2D(GLenum target, GLint level, GLint internalFormat,
}
GLubyte* targetData = _glGetMipmapLocation(active, level);
assert(targetData);
if(!data) {
/* No data? Do nothing! */
@ -679,7 +813,7 @@ void APIENTRY glTexImage2D(GLenum target, GLint level, GLint internalFormat,
return;
}
GLushort* dest = (GLushort*) targetData;
GLubyte* dest = (GLubyte*) targetData;
const GLubyte* source = data;
GLint stride = _determineStride(format, type);
@ -691,10 +825,10 @@ void APIENTRY glTexImage2D(GLenum target, GLint level, GLint internalFormat,
/* Perform the conversion */
GLuint i;
for(i = 0; i < bytes; i += 2) {
for(i = 0; i < bytes; i += destStride) {
convert(source, dest);
dest++;
dest += destStride;
source += stride;
}
}
@ -769,3 +903,95 @@ void APIENTRY glTexParameteri(GLenum target, GLenum pname, GLint param) {
}
}
}
GLAPI void APIENTRY glColorTableEXT(GLenum target, GLenum internalFormat, GLsizei width, GLenum format, GLenum type, const GLvoid *data) {
GLenum validTargets[] = {GL_TEXTURE_2D, 0};
GLenum validInternalFormats[] = {GL_RGB8, GL_RGBA8, 0};
GLenum validFormats[] = {GL_RGB, GL_RGBA, 0};
GLenum validTypes[] = {GL_UNSIGNED_BYTE, GL_BYTE, GL_UNSIGNED_SHORT, GL_SHORT, 0};
if(_glCheckValidEnum(target, validTargets, __func__) != 0) {
return;
}
if(_glCheckValidEnum(internalFormat, validInternalFormats, __func__) != 0) {
return;
}
if(_glCheckValidEnum(format, validFormats, __func__) != 0) {
return;
}
if(_glCheckValidEnum(type, validTypes, __func__) != 0) {
return;
}
/* Only allow up to 256 colours in a palette */
if(width > 256 || width == 0) {
_glKosThrowError(GL_INVALID_VALUE, __func__);
_glKosPrintError();
return;
}
GLuint sourceStride = _determineStride(format, type);
TextureConversionFunc convert = _determineConversion(
GL_RGBA8, /* We always store palettes in this format */
format,
type
);
if(!convert) {
_glKosThrowError(GL_INVALID_OPERATION, __func__);
_glKosPrintError();
return;
}
TextureObject* active = getBoundTexture();
if(active->palette) {
free(active->palette->data);
active->palette->data = NULL;
} else {
active->palette = (TexturePalette*) malloc(sizeof(TexturePalette));
}
active->palette->data = (GLubyte*) malloc(width * 4);
active->palette->format = format;
active->palette->width = width;
GLubyte* src = (GLubyte*) data;
GLubyte* dst = (GLubyte*) active->palette->data;
/* Transform and copy the source palette to the texture */
GLushort i = 0;
for(; i < width; ++i) {
convert(src, dst);
src += sourceStride;
dst += 4;
}
/* Apply the palette immediately, we'll also do this when binding the texture */
_glApplyColorTable();
}
GLAPI void APIENTRY glColorSubTableEXT(GLenum target, GLsizei start, GLsizei count, GLenum format, GLenum type, const GLvoid *data) {
_glKosThrowError(GL_INVALID_OPERATION, __func__);
_glKosPrintError();
}
GLAPI void APIENTRY glGetColorTableEXT(GLenum target, GLenum format, GLenum type, GLvoid *data) {
_glKosThrowError(GL_INVALID_OPERATION, __func__);
_glKosPrintError();
}
GLAPI void APIENTRY glGetColorTableParameterivEXT(GLenum target, GLenum pname, GLint *params) {
_glKosThrowError(GL_INVALID_OPERATION, __func__);
_glKosPrintError();
}
GLAPI void APIENTRY glGetColorTableParameterfvEXT(GLenum target, GLenum pname, GLfloat *params) {
_glKosThrowError(GL_INVALID_OPERATION, __func__);
_glKosPrintError();
}

15
include/gl.h
View File

@ -339,6 +339,7 @@ __BEGIN_DECLS
#define GL_UNSIGNED_SHORT_4_4_4_4_REV 0x8365
#define GL_UNSIGNED_SHORT_1_5_5_5_REV 0x8366
#define GL_COLOR_INDEX 0x1900
#define GL_RED 0x1903
#define GL_GREEN 0x1904
#define GL_BLUE 0x1905
@ -349,6 +350,20 @@ __BEGIN_DECLS
#define GL_LUMINANCE_ALPHA 0x190A
#define GL_BGRA 0x80E1
#define GL_RGB4 0x804F
#define GL_RGB5 0x8050
#define GL_RGB8 0x8051
#define GL_RGB10 0x8052
#define GL_RGB12 0x8053
#define GL_RGB16 0x8054
#define GL_RGBA2 0x8055
#define GL_RGBA4 0x8056
#define GL_RGB5_A1 0x8057
#define GL_RGBA8 0x8058
#define GL_RGB10_A2 0x8059
#define GL_RGBA12 0x805A
#define GL_RGBA16 0x805B
#define GLbyte char
#define GLshort short
#define GLint int

25
include/glext.h
View File

@ -134,6 +134,31 @@ GLAPI void APIENTRY glGenerateMipmapEXT(GLenum target);
GLAPI GLenum APIENTRY glCheckFramebufferStatusEXT(GLenum target);
GLAPI GLboolean APIENTRY glIsFramebufferEXT(GLuint framebuffer);
/* ext_paletted_texture */
#define GL_COLOR_INDEX1_EXT 0x80E2
#define GL_COLOR_INDEX2_EXT 0x80E3
#define GL_COLOR_INDEX4_EXT 0x80E4
#define GL_COLOR_INDEX8_EXT 0x80E5
#define GL_COLOR_INDEX12_EXT 0x80E6
#define GL_COLOR_INDEX16_EXT 0x80E7
#define GL_COLOR_TABLE_FORMAT_EXT 0x80D8
#define GL_COLOR_TABLE_WIDTH_EXT 0x80D9
#define GL_COLOR_TABLE_RED_SIZE_EXT 0x80DA
#define GL_COLOR_TABLE_GREEN_SIZE_EXT 0x80DB
#define GL_COLOR_TABLE_BLUE_SIZE_EXT 0x80DC
#define GL_COLOR_TABLE_ALPHA_SIZE_EXT 0x80DD
#define GL_COLOR_TABLE_LUMINANCE_SIZE_EXT 0x80DE
#define GL_COLOR_TABLE_INTENSITY_SIZE_EXT 0x80DF
#define GL_TEXTURE_INDEX_SIZE_EXT 0x80ED
GLAPI void APIENTRY glColorTableEXT(GLenum target, GLenum internalFormat, GLsizei width, GLenum format, GLenum type, const GLvoid *data);
GLAPI void APIENTRY glColorSubTableEXT(GLenum target, GLsizei start, GLsizei count, GLenum format, GLenum type, const GLvoid *data);
GLAPI void APIENTRY glGetColorTableEXT(GLenum target, GLenum format, GLenum type, GLvoid *data);
GLAPI void APIENTRY glGetColorTableParameterivEXT(GLenum target, GLenum pname, GLint *params);
GLAPI void APIENTRY glGetColorTableParameterfvEXT(GLenum target, GLenum pname, GLfloat *params);
/* Loads VQ compressed texture from SH4 RAM into PVR VRAM */
/* internalformat must be one of the following constants:
GL_UNSIGNED_SHORT_5_6_5_VQ

1
samples/Makefile
View File

@ -22,3 +22,4 @@ all:
$(KOS_MAKE) -C quadmark all
$(KOS_MAKE) -C trimark all
$(KOS_MAKE) -C multitexture_arrays all
$(KOS_MAKE) -C paletted all

29
samples/paletted/Makefile Normal file
View File

@ -0,0 +1,29 @@
TARGET = paletted.elf
OBJS = main.o
all: rm-elf $(TARGET)
include $(KOS_BASE)/Makefile.rules
clean:
-rm -f $(TARGET) $(OBJS) romdisk.*
rm-elf:
-rm -f $(TARGET) romdisk.*
$(TARGET): $(OBJS) romdisk.o
$(KOS_CC) $(KOS_CFLAGS) $(KOS_LDFLAGS) -o $(TARGET) $(KOS_START) \
$(OBJS) romdisk.o $(OBJEXTRA) -lm -lkosutils $(KOS_LIBS)
romdisk.img:
$(KOS_GENROMFS) -f romdisk.img -d romdisk -v
romdisk.o: romdisk.img
$(KOS_BASE)/utils/bin2o/bin2o romdisk.img romdisk romdisk.o
run: $(TARGET)
$(KOS_LOADER) $(TARGET)
dist:
rm -f $(OBJS) romdisk.o romdisk.img
$(KOS_STRIP) $(TARGET)

236
samples/paletted/main.c Normal file
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@ -0,0 +1,236 @@
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "gl.h"
#include "glext.h"
#include "glu.h"
#include "glkos.h"
extern uint8 romdisk[];
KOS_INIT_ROMDISK(romdisk);
/* floats for x rotation, y rotation, z rotation */
float xrot, yrot, zrot;
/* storage for one texture */
int texture[1];
typedef struct {
unsigned int height;
unsigned int width;
unsigned int palette_width;
char* palette;
char* data;
} Image;
int LoadPalettedTex(const char* filename, Image* image) {
struct {
char id[4]; // 'DTEX'
short width;
short height;
int type;
int size;
} header;
FILE* filein = NULL;
filein = fopen(filename, "rb");
if(!filein) {
printf("Unable to open file\n");
return 0;
}
fread(&header, sizeof(header), 1, filein);
if((header.type & (7 << 27)) >> 27 != 6) {
printf("Not PAL8BPP format\n");
return 0;
}
image->width = header.width;
image->height = header.height;
image->data = (char*) malloc(sizeof(char) * header.size);
fread(image->data, header.size, sizeof(char), filein);
fclose(filein);
char palette_filename[100];
strcpy(palette_filename, filename);
strcat(palette_filename, ".pal");
filein = fopen(palette_filename, "rb");
if(!filename) {
printf("Unable to open the palette file\n");
return 0;
}
struct {
char id[4];
int numcolors;
} palette_header;
fread(&palette_header, sizeof(palette_header), 1, filein);
image->palette = (unsigned int*) malloc(sizeof(unsigned int) * palette_header.numcolors);
image->palette_width = palette_header.numcolors;
fread(image->palette, sizeof(unsigned int), palette_header.numcolors, filein);
unsigned int i = 0;
for(; i < palette_header.numcolors; ++i) {
unsigned int* p = (unsigned int*) image->palette;
// Swap the colours around from ARGB to RGBA
char r = (p[i] & 0x00FF0000) >> 16;
char g = (p[i] & 0x0000FF00) >> 8;
char b = (p[i] & 0x000000FF);
char a = (p[i] & 0xFF000000) >> 24;
image->palette[i * 4] = r;
image->palette[i * 4 + 1] = g;
image->palette[i * 4 + 2] = b;
image->palette[i * 4 + 3] = a;
}
return 1;
}
// Load Bitmaps And Convert To Textures
void LoadGLTextures() {
// Load Texture
Image *image1;
// allocate space for texture
image1 = (Image *) malloc(sizeof(Image));
if (image1 == NULL) {
printf("Error allocating space for image");
exit(0);
}
if (!LoadPalettedTex("/rd/NeHe.tex", image1)) {
exit(1);
}
// Create Texture
glGenTextures(1, &texture[0]);
glBindTexture(GL_TEXTURE_2D, texture[0]); // 2d texture (x and y size)
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER, GL_LINEAR); // scale linearly when image bigger than texture
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER, GL_LINEAR); // scale linearly when image smalled than texture
glColorTableEXT(GL_TEXTURE_2D, GL_RGBA8, image1->palette_width, GL_RGBA, GL_UNSIGNED_BYTE, image1->palette);
// 2d texture, level of detail 0 (normal), 3 components (red, green, blue), x size from image, y size from image,
// border 0 (normal), rgb color data, unsigned byte data, and finally the data itself.
glTexImage2D(GL_TEXTURE_2D, 0, GL_COLOR_INDEX8_EXT, image1->width, image1->height, 0, GL_COLOR_INDEX, GL_UNSIGNED_BYTE, image1->data);
};
/* A general OpenGL initialization function. Sets all of the initial parameters. */
void InitGL(int Width, int Height) // We call this right after our OpenGL window is created.
{
LoadGLTextures();
glEnable(GL_TEXTURE_2D);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // This Will Clear The Background Color To Black
glClearDepth(1.0); // Enables Clearing Of The Depth Buffer
glDepthFunc(GL_LESS); // The Type Of Depth Test To Do
glEnable(GL_DEPTH_TEST); // Enables Depth Testing
glShadeModel(GL_SMOOTH); // Enables Smooth Color Shading
glMatrixMode(GL_PROJECTION);
glLoadIdentity(); // Reset The Projection Matrix
gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f); // Calculate The Aspect Ratio Of The Window
glMatrixMode(GL_MODELVIEW);
}
/* The function called when our window is resized (which shouldn't happen, because we're fullscreen) */
void ReSizeGLScene(int Width, int Height)
{
if (Height == 0) // Prevent A Divide By Zero If The Window Is Too Small
Height = 1;
glViewport(0, 0, Width, Height); // Reset The Current Viewport And Perspective Transformation
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0f,(GLfloat)Width/(GLfloat)Height,0.1f,100.0f);
glMatrixMode(GL_MODELVIEW);
}
/* The main drawing function. */
void DrawGLScene()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
glLoadIdentity(); // Reset The View
glTranslatef(0.0f,0.0f,-5.0f); // move 5 units into the screen.
glRotatef(xrot,1.0f,0.0f,0.0f); // Rotate On The X Axis
glRotatef(yrot,0.0f,1.0f,0.0f); // Rotate On The Y Axis
glRotatef(zrot,0.0f,0.0f,1.0f); // Rotate On The Z Axis
glBindTexture(GL_TEXTURE_2D, texture[0]); // choose the texture to use.
glBegin(GL_QUADS); // begin drawing a cube
// Front Face (note that the texture's corners have to match the quad's corners)
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f); // Bottom Left Of The Texture and Quad
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f); // Bottom Right Of The Texture and Quad
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right Of The Texture and Quad
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left Of The Texture and Quad
// Back Face
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f); // Bottom Right Of The Texture and Quad
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f); // Top Right Of The Texture and Quad
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f); // Top Left Of The Texture and Quad
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f); // Bottom Left Of The Texture and Quad
// Top Face
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f); // Top Left Of The Texture and Quad
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom Left Of The Texture and Quad
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, 1.0f, 1.0f); // Bottom Right Of The Texture and Quad
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f); // Top Right Of The Texture and Quad
// Bottom Face
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, -1.0f, -1.0f); // Top Right Of The Texture and Quad
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, -1.0f, -1.0f); // Top Left Of The Texture and Quad
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f); // Bottom Left Of The Texture and Quad
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f); // Bottom Right Of The Texture and Quad
// Right face
glTexCoord2f(1.0f, 0.0f); glVertex3f( 1.0f, -1.0f, -1.0f); // Bottom Right Of The Texture and Quad
glTexCoord2f(1.0f, 1.0f); glVertex3f( 1.0f, 1.0f, -1.0f); // Top Right Of The Texture and Quad
glTexCoord2f(0.0f, 1.0f); glVertex3f( 1.0f, 1.0f, 1.0f); // Top Left Of The Texture and Quad
glTexCoord2f(0.0f, 0.0f); glVertex3f( 1.0f, -1.0f, 1.0f); // Bottom Left Of The Texture and Quad
// Left Face
glTexCoord2f(0.0f, 0.0f); glVertex3f(-1.0f, -1.0f, -1.0f); // Bottom Left Of The Texture and Quad
glTexCoord2f(1.0f, 0.0f); glVertex3f(-1.0f, -1.0f, 1.0f); // Bottom Right Of The Texture and Quad
glTexCoord2f(1.0f, 1.0f); glVertex3f(-1.0f, 1.0f, 1.0f); // Top Right Of The Texture and Quad
glTexCoord2f(0.0f, 1.0f); glVertex3f(-1.0f, 1.0f, -1.0f); // Top Left Of The Texture and Quad
glEnd(); // done with the polygon.
xrot+=1.5f; // X Axis Rotation
yrot+=1.5f; // Y Axis Rotation
zrot+=1.5f; // Z Axis Rotation
//
// swap buffers to display, since we're double buffered.
glKosSwapBuffers();
}
int main(int argc, char **argv)
{
glKosInit();
InitGL(640, 480);
ReSizeGLScene(640, 480);
while(1) {
DrawGLScene();
}
return 0;
}

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