2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
6 * Copyright (c) 2008-2009 VMware, Inc.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
31 * \author Gareth Hughes
37 #include "texcompress.h"
38 #include "texcompress_fxt1.h"
39 #include "texcompress_s3tc.h"
40 #include "texformat.h"
44 * Choose an appropriate texture format given the format, type and
45 * internalFormat parameters passed to glTexImage().
47 * \param ctx the GL context.
48 * \param internalFormat user's prefered internal texture format.
49 * \param format incoming image pixel format.
50 * \param type incoming image data type.
52 * \return a pointer to a gl_texture_format object which describes the
53 * choosen texture format, or NULL on failure.
55 * This is called via dd_function_table::ChooseTextureFormat. Hardware drivers
56 * will typically override this function with a specialized version.
59 _mesa_choose_tex_format( GLcontext
*ctx
, GLint internalFormat
,
60 GLenum format
, GLenum type
)
65 switch (internalFormat
) {
73 return MESA_FORMAT_RGBA8888
;
75 return MESA_FORMAT_ARGB1555
;
77 return MESA_FORMAT_ARGB4444_REV
; /* just to test another format*/
79 return MESA_FORMAT_ARGB4444
;
88 return MESA_FORMAT_RGB888
;
90 return MESA_FORMAT_RGB332
;
92 return MESA_FORMAT_RGB565_REV
; /* just to test another format */
94 return MESA_FORMAT_RGB565
;
102 return MESA_FORMAT_A8
;
104 /* Luminance formats */
111 return MESA_FORMAT_L8
;
113 /* Luminance/Alpha formats */
115 case GL_LUMINANCE_ALPHA
:
116 case GL_LUMINANCE4_ALPHA4
:
117 case GL_LUMINANCE6_ALPHA2
:
118 case GL_LUMINANCE8_ALPHA8
:
119 return MESA_FORMAT_AL88
;
121 case GL_LUMINANCE12_ALPHA4
:
122 case GL_LUMINANCE12_ALPHA12
:
123 case GL_LUMINANCE16_ALPHA16
:
124 return MESA_FORMAT_AL1616
;
131 return MESA_FORMAT_I8
;
134 case GL_COLOR_INDEX1_EXT
:
135 case GL_COLOR_INDEX2_EXT
:
136 case GL_COLOR_INDEX4_EXT
:
137 case GL_COLOR_INDEX12_EXT
:
138 case GL_COLOR_INDEX16_EXT
:
139 case GL_COLOR_INDEX8_EXT
:
140 return MESA_FORMAT_CI8
;
146 if (ctx
->Extensions
.ARB_depth_texture
) {
147 switch (internalFormat
) {
148 case GL_DEPTH_COMPONENT
:
149 case GL_DEPTH_COMPONENT24
:
150 case GL_DEPTH_COMPONENT32
:
151 return MESA_FORMAT_Z32
;
152 case GL_DEPTH_COMPONENT16
:
153 return MESA_FORMAT_Z16
;
159 switch (internalFormat
) {
160 case GL_COMPRESSED_ALPHA_ARB
:
161 return MESA_FORMAT_A8
;
162 case GL_COMPRESSED_LUMINANCE_ARB
:
163 return MESA_FORMAT_L8
;
164 case GL_COMPRESSED_LUMINANCE_ALPHA_ARB
:
165 return MESA_FORMAT_AL88
;
166 case GL_COMPRESSED_INTENSITY_ARB
:
167 return MESA_FORMAT_I8
;
168 case GL_COMPRESSED_RGB_ARB
:
169 if (ctx
->Extensions
.EXT_texture_compression_s3tc
||
170 ctx
->Extensions
.S3_s3tc
)
171 return MESA_FORMAT_RGB_DXT1
;
172 if (ctx
->Extensions
.TDFX_texture_compression_FXT1
)
173 return MESA_FORMAT_RGB_FXT1
;
174 return MESA_FORMAT_RGB888
;
175 case GL_COMPRESSED_RGBA_ARB
:
176 if (ctx
->Extensions
.EXT_texture_compression_s3tc
||
177 ctx
->Extensions
.S3_s3tc
)
178 return MESA_FORMAT_RGBA_DXT3
; /* Not rgba_dxt1, see spec */
179 if (ctx
->Extensions
.TDFX_texture_compression_FXT1
)
180 return MESA_FORMAT_RGBA_FXT1
;
181 return MESA_FORMAT_RGBA8888
;
186 if (ctx
->Extensions
.MESA_ycbcr_texture
) {
187 if (internalFormat
== GL_YCBCR_MESA
) {
188 if (type
== GL_UNSIGNED_SHORT_8_8_MESA
)
189 return MESA_FORMAT_YCBCR
;
191 return MESA_FORMAT_YCBCR_REV
;
195 #if FEATURE_texture_fxt1
196 if (ctx
->Extensions
.TDFX_texture_compression_FXT1
) {
197 switch (internalFormat
) {
198 case GL_COMPRESSED_RGB_FXT1_3DFX
:
199 return MESA_FORMAT_RGB_FXT1
;
200 case GL_COMPRESSED_RGBA_FXT1_3DFX
:
201 return MESA_FORMAT_RGBA_FXT1
;
208 #if FEATURE_texture_s3tc
209 if (ctx
->Extensions
.EXT_texture_compression_s3tc
) {
210 switch (internalFormat
) {
211 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT
:
212 return MESA_FORMAT_RGB_DXT1
;
213 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
:
214 return MESA_FORMAT_RGBA_DXT1
;
215 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
:
216 return MESA_FORMAT_RGBA_DXT3
;
217 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
:
218 return MESA_FORMAT_RGBA_DXT5
;
224 if (ctx
->Extensions
.S3_s3tc
) {
225 switch (internalFormat
) {
228 return MESA_FORMAT_RGB_DXT1
;
231 return MESA_FORMAT_RGBA_DXT3
;
238 if (ctx
->Extensions
.ARB_texture_float
) {
239 switch (internalFormat
) {
240 case GL_ALPHA16F_ARB
:
241 return MESA_FORMAT_ALPHA_FLOAT16
;
242 case GL_ALPHA32F_ARB
:
243 return MESA_FORMAT_ALPHA_FLOAT32
;
244 case GL_LUMINANCE16F_ARB
:
245 return MESA_FORMAT_LUMINANCE_FLOAT16
;
246 case GL_LUMINANCE32F_ARB
:
247 return MESA_FORMAT_LUMINANCE_FLOAT32
;
248 case GL_LUMINANCE_ALPHA16F_ARB
:
249 return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16
;
250 case GL_LUMINANCE_ALPHA32F_ARB
:
251 return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32
;
252 case GL_INTENSITY16F_ARB
:
253 return MESA_FORMAT_INTENSITY_FLOAT16
;
254 case GL_INTENSITY32F_ARB
:
255 return MESA_FORMAT_INTENSITY_FLOAT32
;
257 return MESA_FORMAT_RGB_FLOAT16
;
259 return MESA_FORMAT_RGB_FLOAT32
;
261 return MESA_FORMAT_RGBA_FLOAT16
;
263 return MESA_FORMAT_RGBA_FLOAT32
;
269 if (ctx
->Extensions
.EXT_packed_depth_stencil
) {
270 switch (internalFormat
) {
271 case GL_DEPTH_STENCIL_EXT
:
272 case GL_DEPTH24_STENCIL8_EXT
:
273 return MESA_FORMAT_Z24_S8
;
279 if (ctx
->Extensions
.ATI_envmap_bumpmap
) {
280 switch (internalFormat
) {
283 return MESA_FORMAT_DUDV8
;
289 if (ctx
->Extensions
.MESA_texture_signed_rgba
) {
290 switch (internalFormat
) {
293 return MESA_FORMAT_SIGNED_RGBA8888
;
300 #if FEATURE_EXT_texture_sRGB
301 if (ctx
->Extensions
.EXT_texture_sRGB
) {
302 switch (internalFormat
) {
305 return MESA_FORMAT_SRGB8
;
306 case GL_SRGB_ALPHA_EXT
:
307 case GL_SRGB8_ALPHA8_EXT
:
308 return MESA_FORMAT_SRGBA8
;
309 case GL_SLUMINANCE_EXT
:
310 case GL_SLUMINANCE8_EXT
:
311 return MESA_FORMAT_SL8
;
312 case GL_SLUMINANCE_ALPHA_EXT
:
313 case GL_SLUMINANCE8_ALPHA8_EXT
:
314 return MESA_FORMAT_SLA8
;
315 case GL_COMPRESSED_SLUMINANCE_EXT
:
316 return MESA_FORMAT_SL8
;
317 case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT
:
318 return MESA_FORMAT_SLA8
;
319 case GL_COMPRESSED_SRGB_EXT
:
320 #if FEATURE_texture_s3tc
321 if (ctx
->Extensions
.EXT_texture_compression_s3tc
)
322 return MESA_FORMAT_SRGB_DXT1
;
324 return MESA_FORMAT_SRGB8
;
325 case GL_COMPRESSED_SRGB_ALPHA_EXT
:
326 #if FEATURE_texture_s3tc
327 if (ctx
->Extensions
.EXT_texture_compression_s3tc
)
328 return MESA_FORMAT_SRGBA_DXT3
; /* Not srgba_dxt1, see spec */
330 return MESA_FORMAT_SRGBA8
;
331 #if FEATURE_texture_s3tc
332 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT
:
333 if (ctx
->Extensions
.EXT_texture_compression_s3tc
)
334 return MESA_FORMAT_SRGB_DXT1
;
336 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT
:
337 if (ctx
->Extensions
.EXT_texture_compression_s3tc
)
338 return MESA_FORMAT_SRGBA_DXT1
;
340 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT
:
341 if (ctx
->Extensions
.EXT_texture_compression_s3tc
)
342 return MESA_FORMAT_SRGBA_DXT3
;
344 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT
:
345 if (ctx
->Extensions
.EXT_texture_compression_s3tc
)
346 return MESA_FORMAT_SRGBA_DXT5
;
353 #endif /* FEATURE_EXT_texture_sRGB */
355 _mesa_problem(ctx
, "unexpected format in _mesa_choose_tex_format()");
356 return MESA_FORMAT_NONE
;