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5564 | serge | 1 | /* |
2 | * Mesa 3-D graphics library |
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3 | * |
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4 | * Copyright 2008 VMware, Inc. |
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5 | * |
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6 | * Permission is hereby granted, free of charge, to any person obtaining a |
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7 | * copy of this software and associated documentation files (the "Software"), |
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8 | * to deal in the Software without restriction, including without limitation |
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9 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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10 | * and/or sell copies of the Software, and to permit persons to whom the |
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11 | * Software is furnished to do so, subject to the following conditions: |
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12 | * |
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13 | * The above copyright notice and this permission notice shall be included |
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14 | * in all copies or substantial portions of the Software. |
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15 | * |
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16 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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17 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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18 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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19 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
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20 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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21 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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22 | * OTHER DEALINGS IN THE SOFTWARE. |
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23 | */ |
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24 | |||
25 | /** |
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26 | * Code to convert compressed/paletted texture images to ordinary images. |
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27 | * See the GL_OES_compressed_paletted_texture spec at |
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28 | * http://khronos.org/registry/gles/extensions/OES/OES_compressed_paletted_texture.txt |
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29 | * |
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30 | * XXX this makes it impossible to add hardware support... |
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31 | */ |
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32 | |||
33 | |||
34 | #include "glheader.h" |
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35 | #include "context.h" |
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36 | #include "mtypes.h" |
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37 | #include "imports.h" |
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38 | #include "pixelstore.h" |
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39 | #include "texcompress_cpal.h" |
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40 | #include "teximage.h" |
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41 | |||
42 | |||
43 | static const struct cpal_format_info { |
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44 | GLenum cpal_format; |
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45 | GLenum format; |
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46 | GLenum type; |
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47 | GLuint palette_size; |
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48 | GLuint size; |
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49 | } formats[] = { |
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50 | { GL_PALETTE4_RGB8_OES, GL_RGB, GL_UNSIGNED_BYTE, 16, 3 }, |
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51 | { GL_PALETTE4_RGBA8_OES, GL_RGBA, GL_UNSIGNED_BYTE, 16, 4 }, |
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52 | { GL_PALETTE4_R5_G6_B5_OES, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 16, 2 }, |
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53 | { GL_PALETTE4_RGBA4_OES, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, 16, 2 }, |
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54 | { GL_PALETTE4_RGB5_A1_OES, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, 16, 2 }, |
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55 | { GL_PALETTE8_RGB8_OES, GL_RGB, GL_UNSIGNED_BYTE, 256, 3 }, |
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56 | { GL_PALETTE8_RGBA8_OES, GL_RGBA, GL_UNSIGNED_BYTE, 256, 4 }, |
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57 | { GL_PALETTE8_R5_G6_B5_OES, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 256, 2 }, |
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58 | { GL_PALETTE8_RGBA4_OES, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, 256, 2 }, |
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59 | { GL_PALETTE8_RGB5_A1_OES, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, 256, 2 } |
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60 | }; |
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61 | |||
62 | |||
63 | /** |
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64 | * Get a color/entry from the palette. |
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65 | */ |
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66 | static GLuint |
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67 | get_palette_entry(const struct cpal_format_info *info, const GLubyte *palette, |
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68 | GLuint index, GLubyte *pixel) |
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69 | { |
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70 | memcpy(pixel, palette + info->size * index, info->size); |
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71 | return info->size; |
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72 | } |
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73 | |||
74 | |||
75 | /** |
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76 | * Convert paletted texture to color texture. |
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77 | */ |
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78 | static void |
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79 | paletted_to_color(const struct cpal_format_info *info, const GLubyte *palette, |
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80 | const void *indices, GLuint num_pixels, GLubyte *image) |
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81 | { |
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82 | GLubyte *pix = image; |
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83 | GLuint remain, i; |
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84 | |||
85 | if (info->palette_size == 16) { |
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86 | /* 4 bits per index */ |
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87 | const GLubyte *ind = (const GLubyte *) indices; |
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88 | |||
89 | /* two pixels per iteration */ |
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90 | remain = num_pixels % 2; |
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91 | for (i = 0; i < num_pixels / 2; i++) { |
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92 | pix += get_palette_entry(info, palette, (ind[i] >> 4) & 0xf, pix); |
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93 | pix += get_palette_entry(info, palette, ind[i] & 0xf, pix); |
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94 | } |
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95 | if (remain) { |
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96 | get_palette_entry(info, palette, (ind[i] >> 4) & 0xf, pix); |
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97 | } |
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98 | } |
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99 | else { |
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100 | /* 8 bits per index */ |
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101 | const GLubyte *ind = (const GLubyte *) indices; |
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102 | for (i = 0; i < num_pixels; i++) |
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103 | pix += get_palette_entry(info, palette, ind[i], pix); |
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104 | } |
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105 | } |
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106 | |||
107 | unsigned |
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108 | _mesa_cpal_compressed_size(int level, GLenum internalFormat, |
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109 | unsigned width, unsigned height) |
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110 | { |
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111 | const struct cpal_format_info *info; |
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112 | const int num_levels = -level + 1; |
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113 | int lvl; |
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114 | unsigned w, h, expect_size; |
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115 | |||
116 | if (internalFormat < GL_PALETTE4_RGB8_OES |
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117 | || internalFormat > GL_PALETTE8_RGB5_A1_OES) { |
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118 | return 0; |
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119 | } |
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120 | |||
121 | info = &formats[internalFormat - GL_PALETTE4_RGB8_OES]; |
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122 | assert(info->cpal_format == internalFormat); |
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123 | |||
124 | expect_size = info->palette_size * info->size; |
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125 | for (lvl = 0; lvl < num_levels; lvl++) { |
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126 | w = width >> lvl; |
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127 | if (!w) |
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128 | w = 1; |
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129 | h = height >> lvl; |
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130 | if (!h) |
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131 | h = 1; |
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132 | |||
133 | if (info->palette_size == 16) |
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134 | expect_size += (w * h + 1) / 2; |
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135 | else |
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136 | expect_size += w * h; |
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137 | } |
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138 | |||
139 | return expect_size; |
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140 | } |
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141 | |||
142 | |||
143 | /** |
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144 | * Convert a call to glCompressedTexImage2D() where internalFormat is a |
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145 | * compressed palette format into a regular GLubyte/RGBA glTexImage2D() call. |
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146 | */ |
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147 | void |
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148 | _mesa_cpal_compressed_teximage2d(GLenum target, GLint level, |
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149 | GLenum internalFormat, |
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150 | GLsizei width, GLsizei height, |
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151 | GLsizei imageSize, const void *palette) |
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152 | { |
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153 | const struct cpal_format_info *info; |
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154 | GLint lvl, num_levels; |
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155 | const GLubyte *indices; |
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156 | GLint saved_align, align; |
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157 | GET_CURRENT_CONTEXT(ctx); |
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158 | |||
159 | /* By this point, the internalFormat should have been validated. |
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160 | */ |
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161 | assert(internalFormat >= GL_PALETTE4_RGB8_OES |
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162 | && internalFormat <= GL_PALETTE8_RGB5_A1_OES); |
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163 | |||
164 | info = &formats[internalFormat - GL_PALETTE4_RGB8_OES]; |
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165 | |||
166 | num_levels = -level + 1; |
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167 | |||
168 | /* first image follows the palette */ |
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169 | indices = (const GLubyte *) palette + info->palette_size * info->size; |
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170 | |||
171 | saved_align = ctx->Unpack.Alignment; |
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172 | align = saved_align; |
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173 | |||
174 | for (lvl = 0; lvl < num_levels; lvl++) { |
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175 | GLsizei w, h; |
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176 | GLuint num_texels; |
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177 | GLubyte *image = NULL; |
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178 | |||
179 | w = width >> lvl; |
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180 | if (!w) |
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181 | w = 1; |
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182 | h = height >> lvl; |
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183 | if (!h) |
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184 | h = 1; |
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185 | num_texels = w * h; |
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186 | if (w * info->size % align) { |
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187 | _mesa_PixelStorei(GL_UNPACK_ALIGNMENT, 1); |
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188 | align = 1; |
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189 | } |
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190 | |||
191 | /* allocate and fill dest image buffer */ |
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192 | if (palette) { |
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193 | image = malloc(num_texels * info->size); |
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194 | paletted_to_color(info, palette, indices, num_texels, image); |
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195 | } |
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196 | |||
197 | _mesa_TexImage2D(target, lvl, info->format, w, h, 0, |
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198 | info->format, info->type, image); |
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199 | free(image); |
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200 | |||
201 | /* advance index pointer to point to next src mipmap */ |
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202 | if (info->palette_size == 16) |
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203 | indices += (num_texels + 1) / 2; |
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204 | else |
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205 | indices += num_texels; |
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206 | } |
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207 | |||
208 | if (saved_align != align) |
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209 | _mesa_PixelStorei(GL_UNPACK_ALIGNMENT, saved_align); |
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210 | }>=>>>>> |