2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
6 * Copyright (c) 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.
28 * Code for glGetTexImage() and glGetCompressedTexImage().
35 #include "texcompress.h"
36 #include "texformat.h"
37 #include "texgetimage.h"
41 #if FEATURE_EXT_texture_sRGB
44 * Test if given texture image is an sRGB format.
47 is_srgb_teximage(const struct gl_texture_image
*texImage
)
49 switch (texImage
->TexFormat
->MesaFormat
) {
50 case MESA_FORMAT_SRGB8
:
51 case MESA_FORMAT_SRGBA8
:
52 case MESA_FORMAT_SARGB8
:
54 case MESA_FORMAT_SLA8
:
55 case MESA_FORMAT_SRGB_DXT1
:
56 case MESA_FORMAT_SRGBA_DXT1
:
57 case MESA_FORMAT_SRGBA_DXT3
:
58 case MESA_FORMAT_SRGBA_DXT5
:
67 * Convert a float value from linear space to a
68 * non-linear sRGB value in [0, 255].
69 * Not terribly efficient.
72 linear_to_nonlinear(GLfloat cl
)
74 /* can't have values outside [0, 1] */
80 cs
= 1.055 * _mesa_pow(cl
, 0.41666) - 0.055;
85 #endif /* FEATURE_EXT_texture_sRGB */
89 * Can the given type represent negative values?
91 static INLINE GLboolean
92 type_with_negative_values(GLenum type
)
99 case GL_HALF_FLOAT_ARB
:
108 * This is the software fallback for Driver.GetTexImage().
109 * All error checking will have been done before this routine is called.
112 _mesa_get_teximage(GLcontext
*ctx
, GLenum target
, GLint level
,
113 GLenum format
, GLenum type
, GLvoid
*pixels
,
114 struct gl_texture_object
*texObj
,
115 struct gl_texture_image
*texImage
)
117 const GLuint dimensions
= (target
== GL_TEXTURE_3D
) ? 3 : 2;
119 if (ctx
->Pack
.BufferObj
->Name
) {
120 /* Packing texture image into a PBO.
121 * Map the (potentially) VRAM-based buffer into our process space so
122 * we can write into it with the code below.
123 * A hardware driver might use a sophisticated blit to move the
124 * texture data to the PBO if the PBO is in VRAM along with the texture.
126 GLubyte
*buf
= (GLubyte
*)
127 ctx
->Driver
.MapBuffer(ctx
, GL_PIXEL_PACK_BUFFER_EXT
,
128 GL_WRITE_ONLY_ARB
, ctx
->Pack
.BufferObj
);
130 /* buffer is already mapped - that's an error */
131 _mesa_error(ctx
, GL_INVALID_OPERATION
,"glGetTexImage(PBO is mapped)");
134 /* <pixels> was an offset into the PBO.
135 * Now make it a real, client-side pointer inside the mapped region.
137 pixels
= ADD_POINTERS(buf
, pixels
);
145 const GLint width
= texImage
->Width
;
146 const GLint height
= texImage
->Height
;
147 const GLint depth
= texImage
->Depth
;
149 for (img
= 0; img
< depth
; img
++) {
150 for (row
= 0; row
< height
; row
++) {
151 /* compute destination address in client memory */
152 GLvoid
*dest
= _mesa_image_address( dimensions
, &ctx
->Pack
, pixels
,
153 width
, height
, format
, type
,
157 if (format
== GL_COLOR_INDEX
) {
158 GLuint indexRow
[MAX_WIDTH
];
160 /* Can't use FetchTexel here because that returns RGBA */
161 if (texImage
->TexFormat
->IndexBits
== 8) {
162 const GLubyte
*src
= (const GLubyte
*) texImage
->Data
;
163 src
+= width
* (img
* texImage
->Height
+ row
);
164 for (col
= 0; col
< width
; col
++) {
165 indexRow
[col
] = src
[col
];
168 else if (texImage
->TexFormat
->IndexBits
== 16) {
169 const GLushort
*src
= (const GLushort
*) texImage
->Data
;
170 src
+= width
* (img
* texImage
->Height
+ row
);
171 for (col
= 0; col
< width
; col
++) {
172 indexRow
[col
] = src
[col
];
177 "Color index problem in _mesa_GetTexImage");
179 _mesa_pack_index_span(ctx
, width
, type
, dest
,
180 indexRow
, &ctx
->Pack
,
181 0 /* no image transfer */);
183 else if (format
== GL_DEPTH_COMPONENT
) {
184 GLfloat depthRow
[MAX_WIDTH
];
186 for (col
= 0; col
< width
; col
++) {
187 (*texImage
->FetchTexelf
)(texImage
, col
, row
, img
,
190 _mesa_pack_depth_span(ctx
, width
, dest
, type
,
191 depthRow
, &ctx
->Pack
);
193 else if (format
== GL_DEPTH_STENCIL_EXT
) {
194 /* XXX Note: we're bypassing texImage->FetchTexel()! */
195 const GLuint
*src
= (const GLuint
*) texImage
->Data
;
196 src
+= width
* row
+ width
* height
* img
;
197 _mesa_memcpy(dest
, src
, width
* sizeof(GLuint
));
198 if (ctx
->Pack
.SwapBytes
) {
199 _mesa_swap4((GLuint
*) dest
, width
);
202 else if (format
== GL_YCBCR_MESA
) {
203 /* No pixel transfer */
204 const GLint rowstride
= texImage
->RowStride
;
206 (const GLushort
*) texImage
->Data
+ row
* rowstride
,
207 width
* sizeof(GLushort
));
208 /* check for byte swapping */
209 if ((texImage
->TexFormat
->MesaFormat
== MESA_FORMAT_YCBCR
210 && type
== GL_UNSIGNED_SHORT_8_8_REV_MESA
) ||
211 (texImage
->TexFormat
->MesaFormat
== MESA_FORMAT_YCBCR_REV
212 && type
== GL_UNSIGNED_SHORT_8_8_MESA
)) {
213 if (!ctx
->Pack
.SwapBytes
)
214 _mesa_swap2((GLushort
*) dest
, width
);
216 else if (ctx
->Pack
.SwapBytes
) {
217 _mesa_swap2((GLushort
*) dest
, width
);
220 #if FEATURE_EXT_texture_sRGB
221 else if (is_srgb_teximage(texImage
)) {
222 /* special case this since need to backconvert values */
223 /* convert row to RGBA format */
224 GLfloat rgba
[MAX_WIDTH
][4];
226 GLbitfield transferOps
= 0x0;
228 for (col
= 0; col
< width
; col
++) {
229 (*texImage
->FetchTexelf
)(texImage
, col
, row
, img
, rgba
[col
]);
230 if (texImage
->_BaseFormat
== GL_LUMINANCE
) {
231 rgba
[col
][RCOMP
] = linear_to_nonlinear(rgba
[col
][RCOMP
]);
232 rgba
[col
][GCOMP
] = 0.0;
233 rgba
[col
][BCOMP
] = 0.0;
235 else if (texImage
->_BaseFormat
== GL_LUMINANCE_ALPHA
) {
236 rgba
[col
][RCOMP
] = linear_to_nonlinear(rgba
[col
][RCOMP
]);
237 rgba
[col
][GCOMP
] = 0.0;
238 rgba
[col
][BCOMP
] = 0.0;
240 else if (texImage
->_BaseFormat
== GL_RGB
||
241 texImage
->_BaseFormat
== GL_RGBA
) {
242 rgba
[col
][RCOMP
] = linear_to_nonlinear(rgba
[col
][RCOMP
]);
243 rgba
[col
][GCOMP
] = linear_to_nonlinear(rgba
[col
][GCOMP
]);
244 rgba
[col
][BCOMP
] = linear_to_nonlinear(rgba
[col
][BCOMP
]);
247 _mesa_pack_rgba_span_float(ctx
, width
, (GLfloat (*)[4]) rgba
,
249 &ctx
->Pack
, transferOps
);
251 #endif /* FEATURE_EXT_texture_sRGB */
253 /* general case: convert row to RGBA format */
254 GLfloat rgba
[MAX_WIDTH
][4];
256 GLbitfield transferOps
= 0x0;
258 /* clamp does not apply to GetTexImage (final conversion)?
259 * Looks like we need clamp though when going from format
260 * containing negative values to unsigned format.
262 if (format
== GL_LUMINANCE
|| format
== GL_LUMINANCE_ALPHA
)
263 transferOps
|= IMAGE_CLAMP_BIT
;
264 else if (!type_with_negative_values(type
) &&
265 (texImage
->TexFormat
->DataType
== GL_FLOAT
||
266 texImage
->TexFormat
->DataType
== GL_SIGNED_NORMALIZED
))
267 transferOps
|= IMAGE_CLAMP_BIT
;
269 for (col
= 0; col
< width
; col
++) {
270 (*texImage
->FetchTexelf
)(texImage
, col
, row
, img
, rgba
[col
]);
271 if (texImage
->_BaseFormat
== GL_ALPHA
) {
272 rgba
[col
][RCOMP
] = 0.0;
273 rgba
[col
][GCOMP
] = 0.0;
274 rgba
[col
][BCOMP
] = 0.0;
276 else if (texImage
->_BaseFormat
== GL_LUMINANCE
) {
277 rgba
[col
][GCOMP
] = 0.0;
278 rgba
[col
][BCOMP
] = 0.0;
279 rgba
[col
][ACOMP
] = 1.0;
281 else if (texImage
->_BaseFormat
== GL_LUMINANCE_ALPHA
) {
282 rgba
[col
][GCOMP
] = 0.0;
283 rgba
[col
][BCOMP
] = 0.0;
285 else if (texImage
->_BaseFormat
== GL_INTENSITY
) {
286 rgba
[col
][GCOMP
] = 0.0;
287 rgba
[col
][BCOMP
] = 0.0;
288 rgba
[col
][ACOMP
] = 1.0;
291 _mesa_pack_rgba_span_float(ctx
, width
, (GLfloat (*)[4]) rgba
,
293 &ctx
->Pack
, transferOps
);
299 if (ctx
->Pack
.BufferObj
->Name
) {
300 ctx
->Driver
.UnmapBuffer(ctx
, GL_PIXEL_PACK_BUFFER_EXT
,
301 ctx
->Pack
.BufferObj
);
308 * This is the software fallback for Driver.GetCompressedTexImage().
309 * All error checking will have been done before this routine is called.
312 _mesa_get_compressed_teximage(GLcontext
*ctx
, GLenum target
, GLint level
,
314 struct gl_texture_object
*texObj
,
315 struct gl_texture_image
*texImage
)
319 if (ctx
->Pack
.BufferObj
->Name
) {
320 /* pack texture image into a PBO */
322 if ((const GLubyte
*) img
+ texImage
->CompressedSize
>
323 (const GLubyte
*) ctx
->Pack
.BufferObj
->Size
) {
324 _mesa_error(ctx
, GL_INVALID_OPERATION
,
325 "glGetCompressedTexImage(invalid PBO access)");
328 buf
= (GLubyte
*) ctx
->Driver
.MapBuffer(ctx
, GL_PIXEL_PACK_BUFFER_EXT
,
330 ctx
->Pack
.BufferObj
);
332 /* buffer is already mapped - that's an error */
333 _mesa_error(ctx
, GL_INVALID_OPERATION
,
334 "glGetCompressedTexImage(PBO is mapped)");
337 img
= ADD_POINTERS(buf
, img
);
344 /* don't use texImage->CompressedSize since that may be padded out */
345 size
= _mesa_compressed_texture_size(ctx
, texImage
->Width
, texImage
->Height
,
347 texImage
->TexFormat
->MesaFormat
);
349 /* just memcpy, no pixelstore or pixel transfer */
350 _mesa_memcpy(img
, texImage
->Data
, size
);
352 if (ctx
->Pack
.BufferObj
->Name
) {
353 ctx
->Driver
.UnmapBuffer(ctx
, GL_PIXEL_PACK_BUFFER_EXT
,
354 ctx
->Pack
.BufferObj
);