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| Rev | Author | Line No. | Line |
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| 55 | pj | 1 | /* $Id: texcompress.c,v 1.1 2003-02-28 11:42:04 pj Exp $ */ |
| 2 | |||
| 3 | /* |
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| 4 | * Mesa 3-D graphics library |
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| 5 | * Version: 4.1 |
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| 6 | * |
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| 7 | * Copyright (C) 1999-2002 Brian Paul All Rights Reserved. |
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| 8 | * |
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| 9 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 10 | * copy of this software and associated documentation files (the "Software"), |
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| 11 | * to deal in the Software without restriction, including without limitation |
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| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 13 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 14 | * Software is furnished to do so, subject to the following conditions: |
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| 15 | * |
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| 16 | * The above copyright notice and this permission notice shall be included |
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| 17 | * in all copies or substantial portions of the Software. |
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| 18 | * |
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | */ |
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| 26 | |||
| 27 | |||
| 28 | #include "glheader.h" |
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| 29 | #include "imports.h" |
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| 30 | #include "context.h" |
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| 31 | #include "image.h" |
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| 32 | #include "texcompress.h" |
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| 33 | #include "texformat.h" |
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| 34 | |||
| 35 | |||
| 36 | /** |
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| 37 | * Get the list of supported internal compression formats. |
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| 38 | * \param formats - the results list (may be NULL) |
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| 39 | * \return number of formats. |
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| 40 | */ |
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| 41 | GLuint |
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| 42 | _mesa_get_compressed_formats( GLcontext *ctx, GLint *formats ) |
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| 43 | { |
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| 44 | GLuint n = 0; |
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| 45 | if (ctx->Extensions.ARB_texture_compression) { |
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| 46 | if (ctx->Extensions.TDFX_texture_compression_FXT1) { |
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| 47 | if (formats) { |
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| 48 | formats[n++] = GL_COMPRESSED_RGB_FXT1_3DFX; |
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| 49 | formats[n++] = GL_COMPRESSED_RGBA_FXT1_3DFX; |
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| 50 | } |
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| 51 | else { |
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| 52 | n += 4; |
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| 53 | } |
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| 54 | } |
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| 55 | } |
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| 56 | return n; |
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| 57 | } |
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| 58 | |||
| 59 | |||
| 60 | |||
| 61 | /** |
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| 62 | * Return bytes of storage needed for the given texture size and compressed |
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| 63 | * format. |
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| 64 | * \param width, height, depth - texture size in texels |
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| 65 | * \param texFormat - one of the compressed format enums |
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| 66 | * \return size in bytes, or zero if bad texFormat |
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| 67 | */ |
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| 68 | GLuint |
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| 69 | _mesa_compressed_texture_size( GLcontext *ctx, |
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| 70 | GLsizei width, GLsizei height, GLsizei depth, |
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| 71 | GLenum format ) |
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| 72 | { |
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| 73 | GLuint size; |
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| 74 | |||
| 75 | switch (format) { |
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| 76 | case GL_COMPRESSED_RGB_FXT1_3DFX: |
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| 77 | case GL_COMPRESSED_RGBA_FXT1_3DFX: |
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| 78 | /* round up to multiple of 4 */ |
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| 79 | size = ((width + 7) / 8) * ((height + 3) / 4) * 16; |
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| 80 | return size; |
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| 81 | default: |
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| 82 | _mesa_problem(ctx, "bad texformat in compressed_texture_size"); |
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| 83 | return 0; |
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| 84 | } |
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| 85 | } |
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| 86 | |||
| 87 | |||
| 88 | /* |
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| 89 | * Compute the bytes per row in a compressed texture image. |
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| 90 | */ |
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| 91 | GLint |
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| 92 | _mesa_compressed_row_stride(GLenum format, GLsizei width) |
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| 93 | { |
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| 94 | GLint bytesPerTile, stride; |
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| 95 | |||
| 96 | switch (format) { |
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| 97 | default: |
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| 98 | return 0; |
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| 99 | } |
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| 100 | |||
| 101 | stride = ((width + 3) / 4) * bytesPerTile; |
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| 102 | return stride; |
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| 103 | } |
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| 104 | |||
| 105 | |||
| 106 | /* |
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| 107 | * Return the address of the pixel at (col, row, img) in a |
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| 108 | * compressed texture image. |
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| 109 | * \param col, row, img - image position (3D) |
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| 110 | * \param format - compressed image format |
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| 111 | * \param width - image width |
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| 112 | * \param image - the image address |
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| 113 | * \return address of pixel at (row, col) |
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| 114 | */ |
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| 115 | GLubyte * |
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| 116 | _mesa_compressed_image_address(GLint col, GLint row, GLint img, |
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| 117 | GLenum format, |
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| 118 | GLsizei width, const GLubyte *image) |
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| 119 | { |
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| 120 | GLint bytesPerTile, stride; |
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| 121 | GLubyte *addr; |
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| 122 | |||
| 123 | ASSERT((row & 3) == 0); |
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| 124 | ASSERT((col & 3) == 0); |
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| 125 | (void) img; |
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| 126 | |||
| 127 | switch (format) { |
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| 128 | default: |
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| 129 | return 0; |
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| 130 | } |
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| 131 | |||
| 132 | stride = ((width + 3) / 4) * bytesPerTile; |
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| 133 | |||
| 134 | addr = (GLubyte *) image + (row / 4) * stride + (col / 4) * bytesPerTile; |
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| 135 | return addr; |
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| 136 | } |
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| 137 | |||
| 138 | |||
| 139 | |||
| 140 | /* |
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| 141 | * \param srcRowStride - source stride, in pixels |
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| 142 | */ |
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| 143 | void |
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| 144 | _mesa_compress_teximage( GLcontext *ctx, GLsizei width, GLsizei height, |
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| 145 | GLenum srcFormat, const GLchan *source, |
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| 146 | GLint srcRowStride, |
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| 147 | const struct gl_texture_format *dstFormat, |
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| 148 | GLubyte *dest, GLint dstRowStride ) |
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| 149 | { |
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| 150 | switch (dstFormat->MesaFormat) { |
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| 151 | default: |
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| 152 | _mesa_problem(ctx, "Bad dstFormat in _mesa_compress_teximage()"); |
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| 153 | return; |
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| 154 | } |
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| 155 | } |