1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
20 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
21 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24 /**
25 * Code to convert compressed/paletted texture images to ordinary images.
26 * See the GL_OES_compressed_paletted_texture spec at
27 * http://khronos.org/registry/gles/extensions/OES/OES_compressed_paletted_texture.txt
28 *
29 * XXX this makes it impossible to add hardware support...
30 */
31
32
33 #include "glheader.h"
34 #include "compiler.h" /* for ASSERT */
35 #include "context.h"
36 #include "mfeatures.h"
37 #include "mtypes.h"
38 #include "imports.h"
39 #include "pixelstore.h"
40 #include "texcompress_cpal.h"
41 #include "teximage.h"
42
43 #if FEATURE_ES
44
45
46 static const struct cpal_format_info {
47 GLenum cpal_format;
48 GLenum format;
49 GLenum type;
50 GLuint palette_size;
51 GLuint size;
52 } formats[] = {
53 { GL_PALETTE4_RGB8_OES, GL_RGB, GL_UNSIGNED_BYTE, 16, 3 },
54 { GL_PALETTE4_RGBA8_OES, GL_RGBA, GL_UNSIGNED_BYTE, 16, 4 },
55 { GL_PALETTE4_R5_G6_B5_OES, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 16, 2 },
56 { GL_PALETTE4_RGBA4_OES, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, 16, 2 },
57 { GL_PALETTE4_RGB5_A1_OES, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, 16, 2 },
58 { GL_PALETTE8_RGB8_OES, GL_RGB, GL_UNSIGNED_BYTE, 256, 3 },
59 { GL_PALETTE8_RGBA8_OES, GL_RGBA, GL_UNSIGNED_BYTE, 256, 4 },
60 { GL_PALETTE8_R5_G6_B5_OES, GL_RGB, GL_UNSIGNED_SHORT_5_6_5, 256, 2 },
61 { GL_PALETTE8_RGBA4_OES, GL_RGBA, GL_UNSIGNED_SHORT_4_4_4_4, 256, 2 },
62 { GL_PALETTE8_RGB5_A1_OES, GL_RGBA, GL_UNSIGNED_SHORT_5_5_5_1, 256, 2 }
63 };
64
65
66 /**
67 * Get a color/entry from the palette.
68 */
69 static GLuint
get_palette_entry(const struct cpal_format_info * info,const GLubyte * palette,GLuint index,GLubyte * pixel)70 get_palette_entry(const struct cpal_format_info *info, const GLubyte *palette,
71 GLuint index, GLubyte *pixel)
72 {
73 memcpy(pixel, palette + info->size * index, info->size);
74 return info->size;
75 }
76
77
78 /**
79 * Convert paletted texture to color texture.
80 */
81 static void
paletted_to_color(const struct cpal_format_info * info,const GLubyte * palette,const void * indices,GLuint num_pixels,GLubyte * image)82 paletted_to_color(const struct cpal_format_info *info, const GLubyte *palette,
83 const void *indices, GLuint num_pixels, GLubyte *image)
84 {
85 GLubyte *pix = image;
86 GLuint remain, i;
87
88 if (info->palette_size == 16) {
89 /* 4 bits per index */
90 const GLubyte *ind = (const GLubyte *) indices;
91
92 /* two pixels per iteration */
93 remain = num_pixels % 2;
94 for (i = 0; i < num_pixels / 2; i++) {
95 pix += get_palette_entry(info, palette, (ind[i] >> 4) & 0xf, pix);
96 pix += get_palette_entry(info, palette, ind[i] & 0xf, pix);
97 }
98 if (remain) {
99 get_palette_entry(info, palette, (ind[i] >> 4) & 0xf, pix);
100 }
101 }
102 else {
103 /* 8 bits per index */
104 const GLubyte *ind = (const GLubyte *) indices;
105 for (i = 0; i < num_pixels; i++)
106 pix += get_palette_entry(info, palette, ind[i], pix);
107 }
108 }
109
110 unsigned
_mesa_cpal_compressed_size(int level,GLenum internalFormat,unsigned width,unsigned height)111 _mesa_cpal_compressed_size(int level, GLenum internalFormat,
112 unsigned width, unsigned height)
113 {
114 const struct cpal_format_info *info;
115 const int num_levels = -level + 1;
116 int lvl;
117 unsigned w, h, expect_size;
118
119 if (internalFormat < GL_PALETTE4_RGB8_OES
120 || internalFormat > GL_PALETTE8_RGB5_A1_OES) {
121 return 0;
122 }
123
124 info = &formats[internalFormat - GL_PALETTE4_RGB8_OES];
125 ASSERT(info->cpal_format == internalFormat);
126
127 expect_size = info->palette_size * info->size;
128 for (lvl = 0; lvl < num_levels; lvl++) {
129 w = width >> lvl;
130 if (!w)
131 w = 1;
132 h = height >> lvl;
133 if (!h)
134 h = 1;
135
136 if (info->palette_size == 16)
137 expect_size += (w * h + 1) / 2;
138 else
139 expect_size += w * h;
140 }
141
142 return expect_size;
143 }
144
145 void
_mesa_cpal_compressed_format_type(GLenum internalFormat,GLenum * format,GLenum * type)146 _mesa_cpal_compressed_format_type(GLenum internalFormat, GLenum *format,
147 GLenum *type)
148 {
149 const struct cpal_format_info *info;
150
151 if (internalFormat < GL_PALETTE4_RGB8_OES
152 || internalFormat > GL_PALETTE8_RGB5_A1_OES) {
153 return;
154 }
155
156 info = &formats[internalFormat - GL_PALETTE4_RGB8_OES];
157 *format = info->format;
158 *type = info->type;
159 }
160
161 /**
162 * Convert a call to glCompressedTexImage2D() where internalFormat is a
163 * compressed palette format into a regular GLubyte/RGBA glTexImage2D() call.
164 */
165 void
_mesa_cpal_compressed_teximage2d(GLenum target,GLint level,GLenum internalFormat,GLsizei width,GLsizei height,GLsizei imageSize,const void * palette)166 _mesa_cpal_compressed_teximage2d(GLenum target, GLint level,
167 GLenum internalFormat,
168 GLsizei width, GLsizei height,
169 GLsizei imageSize, const void *palette)
170 {
171 const struct cpal_format_info *info;
172 GLint lvl, num_levels;
173 const GLubyte *indices;
174 GLint saved_align, align;
175 GET_CURRENT_CONTEXT(ctx);
176
177 /* By this point, the internalFormat should have been validated.
178 */
179 assert(internalFormat >= GL_PALETTE4_RGB8_OES
180 && internalFormat <= GL_PALETTE8_RGB5_A1_OES);
181
182 info = &formats[internalFormat - GL_PALETTE4_RGB8_OES];
183
184 num_levels = -level + 1;
185
186 /* first image follows the palette */
187 indices = (const GLubyte *) palette + info->palette_size * info->size;
188
189 saved_align = ctx->Unpack.Alignment;
190 align = saved_align;
191
192 for (lvl = 0; lvl < num_levels; lvl++) {
193 GLsizei w, h;
194 GLuint num_texels;
195 GLubyte *image = NULL;
196
197 w = width >> lvl;
198 if (!w)
199 w = 1;
200 h = height >> lvl;
201 if (!h)
202 h = 1;
203 num_texels = w * h;
204 if (w * info->size % align) {
205 _mesa_PixelStorei(GL_UNPACK_ALIGNMENT, 1);
206 align = 1;
207 }
208
209 /* allocate and fill dest image buffer */
210 if (palette) {
211 image = (GLubyte *) malloc(num_texels * info->size);
212 paletted_to_color(info, palette, indices, num_texels, image);
213 }
214
215 _mesa_TexImage2D(target, lvl, info->format, w, h, 0,
216 info->format, info->type, image);
217 if (image)
218 free(image);
219
220 /* advance index pointer to point to next src mipmap */
221 if (info->palette_size == 16)
222 indices += (num_texels + 1) / 2;
223 else
224 indices += num_texels;
225 }
226
227 if (saved_align != align)
228 _mesa_PixelStorei(GL_UNPACK_ALIGNMENT, saved_align);
229 }
230
231 #endif
232