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/**************************************************************************
*
* Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
**************************************************************************/
/**
* Code to convert compressed/paletted texture images to ordinary 4-byte RGBA.
* See the GL_OES_compressed_paletted_texture spec at
* http://khronos.org/registry/gles/extensions/OES/OES_compressed_paletted_texture.txt
*/
#include <stdlib.h>
#include <assert.h>
#include "GLES/gl.h"
#include "GLES/glext.h"
void GL_APIENTRY _es_CompressedTexImage2DARB(GLenum target, GLint level, GLenum internalFormat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, const GLvoid *data);
void GL_APIENTRY _mesa_TexImage2D(GLenum target, GLint level, GLint internalFormat, GLsizei width, GLsizei height, GLint border, GLenum format, GLenum type, const GLvoid *pixels);
void GL_APIENTRY _mesa_CompressedTexImage2DARB(GLenum target, GLint level, GLenum internalFormat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, const GLvoid *data);
static const struct {
GLenum format;
GLuint palette_size;
GLuint size;
} formats[] = {
{ GL_PALETTE4_RGB8_OES, 16, 3 },
{ GL_PALETTE4_RGBA8_OES, 16, 4 },
{ GL_PALETTE4_R5_G6_B5_OES, 16, 2 },
{ GL_PALETTE4_RGBA4_OES, 16, 2 },
{ GL_PALETTE4_RGB5_A1_OES, 16, 2 },
{ GL_PALETTE8_RGB8_OES, 256, 3 },
{ GL_PALETTE8_RGBA8_OES, 256, 4 },
{ GL_PALETTE8_R5_G6_B5_OES, 256, 2 },
{ GL_PALETTE8_RGBA4_OES, 256, 2 },
{ GL_PALETTE8_RGB5_A1_OES, 256, 2 }
};
/**
* Get a color/entry from the palette. Convert to GLubyte/RGBA format.
*/
static void
get_palette_entry(GLenum format, const void *palette, GLuint index,
GLubyte rgba[4])
{
switch (format) {
case GL_PALETTE4_RGB8_OES:
case GL_PALETTE8_RGB8_OES:
{
const GLubyte *pal = (const GLubyte *) palette;
rgba[0] = pal[index * 3 + 0];
rgba[1] = pal[index * 3 + 1];
rgba[2] = pal[index * 3 + 2];
rgba[3] = 255;
}
break;
case GL_PALETTE4_RGBA8_OES:
case GL_PALETTE8_RGBA8_OES:
{
const GLubyte *pal = (const GLubyte *) palette;
rgba[0] = pal[index * 4 + 0];
rgba[1] = pal[index * 4 + 1];
rgba[2] = pal[index * 4 + 2];
rgba[3] = pal[index * 4 + 3];
}
break;
case GL_PALETTE4_R5_G6_B5_OES:
case GL_PALETTE8_R5_G6_B5_OES:
{
const GLushort *pal = (const GLushort *) palette;
const GLushort color = pal[index];
rgba[0] = ((color >> 8) & 0xf8) | ((color >> 11) & 0x3);
rgba[1] = ((color >> 3) & 0xfc) | ((color >> 1 ) & 0x3);
rgba[2] = ((color << 3) & 0xf8) | ((color ) & 0x7);
rgba[3] = 255;
}
break;
case GL_PALETTE4_RGBA4_OES:
case GL_PALETTE8_RGBA4_OES:
{
const GLushort *pal = (const GLushort *) palette;
const GLushort color = pal[index];
rgba[0] = ((color & 0xf000) >> 8) | ((color & 0xf000) >> 12);
rgba[1] = ((color & 0x0f00) >> 4) | ((color & 0x0f00) >> 8);
rgba[2] = ((color & 0x00f0) ) | ((color & 0x00f0) >> 4);
rgba[3] = ((color & 0x000f) << 4) | ((color & 0x000f) );
}
break;
case GL_PALETTE4_RGB5_A1_OES:
case GL_PALETTE8_RGB5_A1_OES:
{
const GLushort *pal = (const GLushort *) palette;
const GLushort color = pal[index];
rgba[0] = ((color >> 8) & 0xf8) | ((color >> 11) & 0x7);
rgba[1] = ((color >> 3) & 0xf8) | ((color >> 6) & 0x7);
rgba[2] = ((color << 2) & 0xf8) | ((color >> 1) & 0x7);
rgba[3] = (color & 0x1) * 255;
}
break;
default:
assert(0);
}
}
/**
* Convert paletted texture to simple GLubyte/RGBA format.
*/
static void
paletted_to_rgba(GLenum src_format,
const void *palette,
const void *indexes,
GLsizei width, GLsizei height,
GLubyte *rgba)
{
GLuint pal_ents, i;
assert(src_format >= GL_PALETTE4_RGB8_OES);
assert(src_format <= GL_PALETTE8_RGB5_A1_OES);
assert(formats[src_format - GL_PALETTE4_RGB8_OES].format == src_format);
pal_ents = formats[src_format - GL_PALETTE4_RGB8_OES].palette_size;
if (pal_ents == 16) {
/* 4 bits per index */
const GLubyte *ind = (const GLubyte *) indexes;
if (width * height == 1) {
/* special case the only odd-sized image */
GLuint index0 = ind[0] >> 4;
get_palette_entry(src_format, palette, index0, rgba);
return;
}
/* two pixels per iteration */
for (i = 0; i < width * height / 2; i++) {
GLuint index0 = ind[i] >> 4;
GLuint index1 = ind[i] & 0xf;
get_palette_entry(src_format, palette, index0, rgba + i * 8);
get_palette_entry(src_format, palette, index1, rgba + i * 8 + 4);
}
}
else {
/* 8 bits per index */
const GLubyte *ind = (const GLubyte *) indexes;
for (i = 0; i < width * height; i++) {
GLuint index = ind[i];
get_palette_entry(src_format, palette, index, rgba + i * 4);
}
}
}
/**
* Convert a call to glCompressedTexImage2D() where internalFormat is a
* compressed palette format into a regular GLubyte/RGBA glTexImage2D() call.
*/
static void
cpal_compressed_teximage2d(GLenum target, GLint level,
GLenum internalFormat,
GLsizei width, GLsizei height,
const void *pixels)
{
GLuint pal_ents, pal_ent_size, pal_bytes;
const GLint num_levels = level + 1;
GLint lvl;
const GLubyte *indexes;
assert(internalFormat >= GL_PALETTE4_RGB8_OES);
assert(internalFormat <= GL_PALETTE8_RGB5_A1_OES);
assert(formats[internalFormat - GL_PALETTE4_RGB8_OES].format == internalFormat);
pal_ents = formats[internalFormat - GL_PALETTE4_RGB8_OES].palette_size;
pal_ent_size = formats[internalFormat - GL_PALETTE4_RGB8_OES].size;
pal_bytes = pal_ents * pal_ent_size;
/* first image follows the palette */
indexes = (const GLubyte *) pixels + pal_bytes;
/* No worries about glPixelStore state since the only supported parameter is
* GL_UNPACK_ALIGNMENT and it doesn't matter when unpacking GLubyte/RGBA.
*/
for (lvl = 0; lvl < num_levels; lvl++) {
/* Allocate GLubyte/RGBA dest image buffer */
GLubyte *rgba = (GLubyte *) malloc(width * height * 4);
if (pixels)
paletted_to_rgba(internalFormat, pixels, indexes, width, height, rgba);
_mesa_TexImage2D(target, lvl, GL_RGBA, width, height, 0,
GL_RGBA, GL_UNSIGNED_BYTE, rgba);
free(rgba);
/* advance index pointer to point to next src mipmap */
if (pal_ents == 4)
indexes += width * height / 2;
else
indexes += width * height;
/* next mipmap level size */
if (width > 1)
width /= 2;
if (height > 1)
height /= 2;
}
}
void GL_APIENTRY
_es_CompressedTexImage2DARB(GLenum target, GLint level, GLenum internalFormat,
GLsizei width, GLsizei height, GLint border,
GLsizei imageSize, const GLvoid *data)
{
switch (internalFormat) {
case GL_PALETTE4_RGB8_OES:
case GL_PALETTE4_RGBA8_OES:
case GL_PALETTE4_R5_G6_B5_OES:
case GL_PALETTE4_RGBA4_OES:
case GL_PALETTE4_RGB5_A1_OES:
case GL_PALETTE8_RGB8_OES:
case GL_PALETTE8_RGBA8_OES:
case GL_PALETTE8_R5_G6_B5_OES:
case GL_PALETTE8_RGBA4_OES:
case GL_PALETTE8_RGB5_A1_OES:
cpal_compressed_teximage2d(target, level, internalFormat,
width, height, data);
break;
default:
_mesa_CompressedTexImage2DARB(target, level, internalFormat,
width, height, border, imageSize, data);
}
}
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