| /* |
| * Mesa 3-D graphics library |
| * Version: 6.5.1 |
| * |
| * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. |
| * Copyright (c) 2008 VMware, Inc. |
| * |
| * Permission is hereby granted, free of charge, to any person obtaining a |
| * copy of this software and associated documentation files (the "Software"), |
| * to deal in the Software without restriction, including without limitation |
| * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
| * and/or sell copies of the Software, and to permit persons to whom the |
| * Software is furnished to do so, subject to the following conditions: |
| * |
| * The above copyright notice and this permission notice shall be included |
| * in all copies or substantial portions of the Software. |
| * |
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
| * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
| * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
| * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
| * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
| */ |
| |
| |
| /** |
| * \file texcompress.c |
| * Helper functions for texture compression. |
| */ |
| |
| |
| #include "glheader.h" |
| #include "imports.h" |
| #include "colormac.h" |
| #include "context.h" |
| #include "formats.h" |
| #include "image.h" |
| #include "mipmap.h" |
| #include "texcompress.h" |
| #include "texstore.h" |
| |
| |
| /** |
| * 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, GLboolean all) |
| { |
| GLuint n = 0; |
| if (ctx->Extensions.TDFX_texture_compression_FXT1) { |
| if (formats) { |
| 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; |
| } |
| |
| |
| /** |
| * Convert a compressed MESA_FORMAT_x to a GLenum. |
| */ |
| gl_format |
| _mesa_glenum_to_compressed_format(GLenum format) |
| { |
| switch (format) { |
| case GL_COMPRESSED_RGB_FXT1_3DFX: |
| return MESA_FORMAT_RGB_FXT1; |
| case GL_COMPRESSED_RGBA_FXT1_3DFX: |
| return MESA_FORMAT_RGBA_FXT1; |
| |
| case GL_COMPRESSED_RGB_S3TC_DXT1_EXT: |
| case GL_RGB_S3TC: |
| return MESA_FORMAT_RGB_DXT1; |
| case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT: |
| case GL_RGB4_S3TC: |
| return MESA_FORMAT_RGBA_DXT1; |
| case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT: |
| case GL_RGBA_S3TC: |
| return MESA_FORMAT_RGBA_DXT3; |
| case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT: |
| case GL_RGBA4_S3TC: |
| return MESA_FORMAT_RGBA_DXT5; |
| |
| case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT: |
| return MESA_FORMAT_SRGB_DXT1; |
| case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT: |
| return MESA_FORMAT_SRGBA_DXT1; |
| case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT: |
| return MESA_FORMAT_SRGBA_DXT3; |
| case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT: |
| return MESA_FORMAT_SRGBA_DXT5; |
| |
| default: |
| return MESA_FORMAT_NONE; |
| } |
| } |
| |
| |
| /** |
| * Given a compressed MESA_FORMAT_x value, return the corresponding |
| * GLenum for that format. |
| * This is needed for glGetTexLevelParameter(GL_TEXTURE_INTERNAL_FORMAT) |
| * which must return the specific texture format used when the user might |
| * have originally specified a generic compressed format in their |
| * glTexImage2D() call. |
| * For non-compressed textures, we always return the user-specified |
| * internal format unchanged. |
| */ |
| GLenum |
| _mesa_compressed_format_to_glenum(GLcontext *ctx, GLuint mesaFormat) |
| { |
| switch (mesaFormat) { |
| #if FEATURE_texture_fxt1 |
| case MESA_FORMAT_RGB_FXT1: |
| return GL_COMPRESSED_RGB_FXT1_3DFX; |
| case MESA_FORMAT_RGBA_FXT1: |
| return GL_COMPRESSED_RGBA_FXT1_3DFX; |
| #endif |
| #if FEATURE_texture_s3tc |
| case MESA_FORMAT_RGB_DXT1: |
| return GL_COMPRESSED_RGB_S3TC_DXT1_EXT; |
| case MESA_FORMAT_RGBA_DXT1: |
| return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT; |
| case MESA_FORMAT_RGBA_DXT3: |
| return GL_COMPRESSED_RGBA_S3TC_DXT3_EXT; |
| case MESA_FORMAT_RGBA_DXT5: |
| return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT; |
| #if FEATURE_EXT_texture_sRGB |
| case MESA_FORMAT_SRGB_DXT1: |
| return GL_COMPRESSED_SRGB_S3TC_DXT1_EXT; |
| case MESA_FORMAT_SRGBA_DXT1: |
| return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT; |
| case MESA_FORMAT_SRGBA_DXT3: |
| return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT; |
| case MESA_FORMAT_SRGBA_DXT5: |
| return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT; |
| #endif |
| #endif |
| default: |
| _mesa_problem(ctx, "Unexpected mesa texture format in" |
| " _mesa_compressed_format_to_glenum()"); |
| return 0; |
| } |
| } |
| |
| |
| /* |
| * Return the address of the pixel at (col, row, img) in a |
| * compressed texture image. |
| * \param col, row, img - image position (3D), should be a multiple of the |
| * format's block size. |
| * \param format - compressed image format |
| * \param width - image width (stride) in pixels |
| * \param image - the image address |
| * \return address of pixel at (row, col, img) |
| */ |
| GLubyte * |
| _mesa_compressed_image_address(GLint col, GLint row, GLint img, |
| gl_format mesaFormat, |
| GLsizei width, const GLubyte *image) |
| { |
| /* XXX only 2D images implemented, not 3D */ |
| const GLuint blockSize = _mesa_get_format_bytes(mesaFormat); |
| GLuint bw, bh; |
| GLint offset; |
| |
| _mesa_get_format_block_size(mesaFormat, &bw, &bh); |
| |
| ASSERT(col % bw == 0); |
| ASSERT(row % bh == 0); |
| |
| offset = ((width + bw - 1) / bw) * (row / bh) + col / bw; |
| offset *= blockSize; |
| |
| return (GLubyte *) image + offset; |
| } |