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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 | } |