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/**************************************************************************
*
* Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
**************************************************************************/
/**
* Code to convert compressed/paletted texture images to ordinary images.
* See the GL_OES_compressed_paletted_texture spec at
* http://khronos.org/registry/gles/extensions/OES/OES_compressed_paletted_texture.txt
*
* XXX this makes it impossible to add hardware support...
*/
#include "glheader.h"
#include "compiler.h" /* for ASSERT */
#include "context.h"
#include "mtypes.h"
#include "imports.h"
#include "pixelstore.h"
#include "teximage.h"
#include "texpal.h"
#if FEATURE_ES
static const struct cpal_format_info {
GLenum cpal_format;
GLenum format;
GLenum type;
GLuint palette_size;
GLuint size;
} formats[] = {
{ GL_PALETTE4_RGB8_OES, GL_RGB, GL_UNSIGNED_BYTE, 16, 3 },
{ GL_PALETTE4_RGBA8_OES, GL_RGBA, GL_UNSIGNED_BYTE, 16, 4 },
{ GL_PALETTE4_R5_G6_B5_OES, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 16, 2 },
{ GL_PALETTE4_RGBA4_OES, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, 16, 2 },
{ GL_PALETTE4_RGB5_A1_OES, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, 16, 2 },
{ GL_PALETTE8_RGB8_OES, GL_RGB, GL_UNSIGNED_BYTE, 256, 3 },
{ GL_PALETTE8_RGBA8_OES, GL_RGBA, GL_UNSIGNED_BYTE, 256, 4 },
{ GL_PALETTE8_R5_G6_B5_OES, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 256, 2 },
{ GL_PALETTE8_RGBA4_OES, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, 256, 2 },
{ GL_PALETTE8_RGB5_A1_OES, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, 256, 2 }
};
/**
* Get a color/entry from the palette.
*/
static GLuint
get_palette_entry(const struct cpal_format_info *info, const GLubyte *palette,
GLuint index, GLubyte *pixel)
{
memcpy(pixel, palette + info->size * index, info->size);
return info->size;
}
/**
* Convert paletted texture to color texture.
*/
static void
paletted_to_color(const struct cpal_format_info *info, const GLubyte *palette,
const void *indices, GLuint num_pixels, GLubyte *image)
{
GLubyte *pix = image;
GLuint remain, i;
if (info->palette_size == 16) {
/* 4 bits per index */
const GLubyte *ind = (const GLubyte *) indices;
/* two pixels per iteration */
remain = num_pixels % 2;
for (i = 0; i < num_pixels / 2; i++) {
pix += get_palette_entry(info, palette, (ind[i] >> 4) & 0xf, pix);
pix += get_palette_entry(info, palette, ind[i] & 0xf, pix);
}
if (remain) {
get_palette_entry(info, palette, (ind[i] >> 4) & 0xf, pix);
}
}
else {
/* 8 bits per index */
const GLubyte *ind = (const GLubyte *) indices;
for (i = 0; i < num_pixels; i++)
pix += get_palette_entry(info, palette, ind[i], pix);
}
}
static const struct cpal_format_info *
cpal_get_info(GLint level, GLenum internalFormat,
GLsizei width, GLsizei height, GLsizei imageSize)
{
const struct cpal_format_info *info;
GLint lvl, num_levels;
GLsizei w, h, expect_size;
info = &formats[internalFormat - GL_PALETTE4_RGB8_OES];
ASSERT(info->cpal_format == internalFormat);
if (level > 0) {
_mesa_error(_mesa_get_current_context(), GL_INVALID_VALUE,
"glCompressedTexImage2D(level=%d)", level);
return NULL;
}
num_levels = -level + 1;
expect_size = info->palette_size * info->size;
for (lvl = 0; lvl < num_levels; lvl++) {
w = width >> lvl;
if (!w)
w = 1;
h = height >> lvl;
if (!h)
h = 1;
if (info->palette_size == 16)
expect_size += (w * h + 1) / 2;
else
expect_size += w * h;
}
if (expect_size > imageSize) {
_mesa_error(_mesa_get_current_context(), GL_INVALID_VALUE,
"glCompressedTexImage2D(imageSize=%d)", imageSize);
return NULL;
}
return info;
}
/**
* Convert a call to glCompressedTexImage2D() where internalFormat is a
* compressed palette format into a regular GLubyte/RGBA glTexImage2D() call.
*/
void
_mesa_cpal_compressed_teximage2d(GLenum target, GLint level,
GLenum internalFormat,
GLsizei width, GLsizei height,
GLsizei imageSize, const void *palette)
{
const struct cpal_format_info *info;
GLint lvl, num_levels;
const GLubyte *indices;
GLint saved_align, align;
GET_CURRENT_CONTEXT(ctx);
info = cpal_get_info(level, internalFormat, width, height, imageSize);
if (!info)
return;
info = &formats[internalFormat - GL_PALETTE4_RGB8_OES];
ASSERT(info->cpal_format == internalFormat);
num_levels = -level + 1;
/* first image follows the palette */
indices = (const GLubyte *) palette + info->palette_size * info->size;
saved_align = ctx->Unpack.Alignment;
align = saved_align;
for (lvl = 0; lvl < num_levels; lvl++) {
GLsizei w, h;
GLuint num_texels;
GLubyte *image = NULL;
w = width >> lvl;
if (!w)
w = 1;
h = height >> lvl;
if (!h)
h = 1;
num_texels = w * h;
if (w * info->size % align) {
_mesa_PixelStorei(GL_UNPACK_ALIGNMENT, 1);
align = 1;
}
/* allocate and fill dest image buffer */
if (palette) {
image = (GLubyte *) malloc(num_texels * info->size);
paletted_to_color(info, palette, indices, num_texels, image);
}
_mesa_TexImage2D(target, lvl, info->format, w, h, 0,
info->format, info->type, image);
if (image)
free(image);
/* advance index pointer to point to next src mipmap */
if (info->palette_size == 16)
indices += (num_texels + 1) / 2;
else
indices += num_texels;
}
if (saved_align != align)
_mesa_PixelStorei(GL_UNPACK_ALIGNMENT, saved_align);
}
#endif
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