-/* $Id: texcompress.c,v 1.3 2002/10/24 23:57:21 brianp Exp $ */
-
/*
* Mesa 3-D graphics library
- * Version: 4.1
+ * Version: 6.5.1
*
- * Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
+ * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
*/
+/**
+ * \file texcompress.c
+ * Helper functions for texture compression.
+ */
+
+
#include "glheader.h"
#include "imports.h"
+#include "colormac.h"
#include "context.h"
#include "image.h"
+#include "mipmap.h"
#include "texcompress.h"
#include "texformat.h"
+#include "texstore.h"
/**
- * Get the list of supported internal compression formats.
- * \param formats - the results list (may be NULL)
+ * Return list of (and count of) all specific texture compression
+ * formats that are supported.
+ *
+ * \param ctx the GL context
+ * \param formats the resulting format list (may be NULL).
+ * \param all if true return all formats, even those with some kind
+ * of restrictions/limitations (See GL_ARB_texture_compression
+ * spec for more info).
+ *
* \return number of formats.
*/
GLuint
-_mesa_get_compressed_formats( GLcontext *ctx, GLint *formats )
+_mesa_get_compressed_formats(GLcontext *ctx, GLint *formats, GLboolean all)
{
GLuint n = 0;
if (ctx->Extensions.ARB_texture_compression) {
formats[n++] = GL_COMPRESSED_RGB_FXT1_3DFX;
formats[n++] = GL_COMPRESSED_RGBA_FXT1_3DFX;
}
+ else {
+ n += 2;
+ }
+ }
+ if (ctx->Extensions.EXT_texture_compression_s3tc) {
+ if (formats) {
+ formats[n++] = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
+ /* This format has some restrictions/limitations and so should
+ * not be returned via the GL_COMPRESSED_TEXTURE_FORMATS query.
+ * Specifically, all transparent pixels become black. NVIDIA
+ * omits this format too.
+ */
+ if (all)
+ formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
+ formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
+ formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
+ }
+ else {
+ n += 3;
+ if (all)
+ n += 1;
+ }
+ }
+ if (ctx->Extensions.S3_s3tc) {
+ if (formats) {
+ formats[n++] = GL_RGB_S3TC;
+ formats[n++] = GL_RGB4_S3TC;
+ formats[n++] = GL_RGBA_S3TC;
+ formats[n++] = GL_RGBA4_S3TC;
+ }
+ else {
+ n += 4;
+ }
+ }
+#if FEATURE_EXT_texture_sRGB
+ if (ctx->Extensions.EXT_texture_sRGB) {
+ if (formats) {
+ formats[n++] = GL_COMPRESSED_SRGB_S3TC_DXT1_EXT;
+ formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
+ formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
+ formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
+ }
else {
n += 4;
}
}
+#endif /* FEATURE_EXT_texture_sRGB */
}
return n;
}
/**
- * Return bytes of storage needed for the given texture size and compressed
- * format.
- * \param width, height, depth - texture size in texels
- * \param texFormat - one of the compressed format enums
- * \return size in bytes, or zero if bad texFormat
+ * Return number of bytes needed to store a texture of the given size
+ * using the specified compressed format.
+ * This is called via the ctx->Driver.CompressedTextureSize function,
+ * unless a device driver overrides it.
+ *
+ * \param width texture width in texels.
+ * \param height texture height in texels.
+ * \param depth texture depth in texels.
+ * \param mesaFormat one of the MESA_FORMAT_* compressed formats
+ *
+ * \return size in bytes, or zero if bad format
*/
GLuint
_mesa_compressed_texture_size( GLcontext *ctx,
GLsizei width, GLsizei height, GLsizei depth,
- GLenum format )
+ GLuint mesaFormat )
{
GLuint size;
- switch (format) {
+ ASSERT(depth == 1);
+ (void) depth;
+
+ switch (mesaFormat) {
+ case MESA_FORMAT_RGB_FXT1:
+ case MESA_FORMAT_RGBA_FXT1:
+ /* round up width to next multiple of 8, height to next multiple of 4 */
+ width = (width + 7) & ~7;
+ height = (height + 3) & ~3;
+ /* 16 bytes per 8x4 tile of RGB[A] texels */
+ size = width * height / 2;
+ /* Textures smaller than 8x4 will effectively be made into 8x4 and
+ * take 16 bytes.
+ */
+ return size;
+ case MESA_FORMAT_RGB_DXT1:
+ case MESA_FORMAT_RGBA_DXT1:
+ /* round up width, height to next multiple of 4 */
+ width = (width + 3) & ~3;
+ height = (height + 3) & ~3;
+ /* 8 bytes per 4x4 tile of RGB[A] texels */
+ size = width * height / 2;
+ /* Textures smaller than 4x4 will effectively be made into 4x4 and
+ * take 8 bytes.
+ */
+ return size;
+ case MESA_FORMAT_RGBA_DXT3:
+ case MESA_FORMAT_RGBA_DXT5:
+ /* round up width, height to next multiple of 4 */
+ width = (width + 3) & ~3;
+ height = (height + 3) & ~3;
+ /* 16 bytes per 4x4 tile of RGBA texels */
+ size = width * height; /* simple! */
+ /* Textures smaller than 4x4 will effectively be made into 4x4 and
+ * take 16 bytes.
+ */
+ return size;
+ default:
+ _mesa_problem(ctx, "bad mesaFormat in _mesa_compressed_texture_size");
+ return 0;
+ }
+}
+
+
+/**
+ * As above, but format is specified by a GLenum (GL_COMPRESSED_*) token.
+ *
+ * Note: This function CAN NOT return a padded hardware texture size.
+ * That's why we don't call the ctx->Driver.CompressedTextureSize() function.
+ *
+ * We use this function to validate the <imageSize> parameter
+ * of glCompressedTex[Sub]Image1/2/3D(), which must be an exact match.
+ */
+GLuint
+_mesa_compressed_texture_size_glenum(GLcontext *ctx,
+ GLsizei width, GLsizei height,
+ GLsizei depth, GLenum glformat)
+{
+ GLuint mesaFormat;
+
+ switch (glformat) {
case GL_COMPRESSED_RGB_FXT1_3DFX:
+ mesaFormat = MESA_FORMAT_RGB_FXT1;
+ break;
case GL_COMPRESSED_RGBA_FXT1_3DFX:
- /* round up to multiple of 4 */
- size = ((width + 7) / 8) * ((height + 3) / 4) * 16;
- return size;
+ mesaFormat = MESA_FORMAT_RGBA_FXT1;
+ break;
+ case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+ case GL_RGB_S3TC:
+ mesaFormat = MESA_FORMAT_RGB_DXT1;
+ break;
+ case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+ case GL_RGB4_S3TC:
+ mesaFormat = MESA_FORMAT_RGBA_DXT1;
+ break;
+ case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+ case GL_RGBA_S3TC:
+ mesaFormat = MESA_FORMAT_RGBA_DXT3;
+ break;
+ case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+ case GL_RGBA4_S3TC:
+ mesaFormat = MESA_FORMAT_RGBA_DXT5;
+ break;
default:
- _mesa_problem(ctx, "bad texformat in compressed_texture_size");
return 0;
}
+
+ return _mesa_compressed_texture_size(ctx, width, height, depth, mesaFormat);
}
/*
* Compute the bytes per row in a compressed texture image.
+ * We use this for computing the destination address for sub-texture updates.
+ * \param mesaFormat one of the MESA_FORMAT_* compressed formats
+ * \param width image width in pixels
+ * \return stride, in bytes, between rows for compressed image
*/
GLint
-_mesa_compressed_row_stride(GLenum format, GLsizei width)
+_mesa_compressed_row_stride(GLuint mesaFormat, GLsizei width)
{
- GLint bytesPerTile, stride;
+ GLint stride;
- switch (format) {
+ switch (mesaFormat) {
+ case MESA_FORMAT_RGB_FXT1:
+ case MESA_FORMAT_RGBA_FXT1:
+ stride = ((width + 7) / 8) * 16; /* 16 bytes per 8x4 tile */
+ break;
+ case MESA_FORMAT_RGB_DXT1:
+ case MESA_FORMAT_RGBA_DXT1:
+ stride = ((width + 3) / 4) * 8; /* 8 bytes per 4x4 tile */
+ break;
+ case MESA_FORMAT_RGBA_DXT3:
+ case MESA_FORMAT_RGBA_DXT5:
+ stride = ((width + 3) / 4) * 16; /* 16 bytes per 4x4 tile */
+ break;
default:
+ _mesa_problem(NULL, "bad mesaFormat in _mesa_compressed_row_stride");
return 0;
}
- stride = ((width + 3) / 4) * bytesPerTile;
return stride;
}
*/
GLubyte *
_mesa_compressed_image_address(GLint col, GLint row, GLint img,
- GLenum format,
+ GLuint mesaFormat,
GLsizei width, const GLubyte *image)
{
- GLint bytesPerTile, stride;
GLubyte *addr;
- ASSERT((row & 3) == 0);
- ASSERT((col & 3) == 0);
(void) img;
- switch (format) {
+ /* We try to spot a "complete" subtexture "above" ROW, COL;
+ * this texture is given by appropriate rounding of WIDTH x ROW.
+ * Then we just add the amount left (usually on the left).
+ *
+ * Example for X*Y microtiles (Z bytes each)
+ * offset = Z * (((width + X - 1) / X) * (row / Y) + col / X);
+ */
+
+ switch (mesaFormat) {
+ case MESA_FORMAT_RGB_FXT1:
+ case MESA_FORMAT_RGBA_FXT1:
+ addr = (GLubyte *) image + 16 * (((width + 7) / 8) * (row / 4) + col / 8);
+ break;
+ case MESA_FORMAT_RGB_DXT1:
+ case MESA_FORMAT_RGBA_DXT1:
+ addr = (GLubyte *) image + 8 * (((width + 3) / 4) * (row / 4) + col / 4);
+ break;
+ case MESA_FORMAT_RGBA_DXT3:
+ case MESA_FORMAT_RGBA_DXT5:
+ addr = (GLubyte *) image + 16 * (((width + 3) / 4) * (row / 4) + col / 4);
+ break;
default:
- return 0;
+ _mesa_problem(NULL, "bad mesaFormat in _mesa_compressed_image_address");
+ addr = NULL;
}
- stride = ((width + 3) / 4) * bytesPerTile;
-
- addr = (GLubyte *) image + (row / 4) * stride + (col / 4) * bytesPerTile;
return addr;
}
-
-
-
-/*
- * \param srcRowStride - source stride, in pixels
- */
-void
-_mesa_compress_teximage( GLcontext *ctx, GLsizei width, GLsizei height,
- GLenum srcFormat, const GLchan *source,
- GLint srcRowStride,
- const struct gl_texture_format *dstFormat,
- GLubyte *dest, GLint dstRowStride )
-{
- switch (dstFormat->MesaFormat) {
- default:
- _mesa_problem(ctx, "Bad dstFormat in _mesa_compress_teximage()");
- return;
- }
-}
projects / mesa.git / blobdiff