2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 #include "bufferobj.h"
31 #include "framebuffer.h"
33 #include "format_unpack.h"
42 * Tries to implement glReadPixels() of GL_DEPTH_COMPONENT using memcpy of the
46 fast_read_depth_pixels( struct gl_context
*ctx
,
48 GLsizei width
, GLsizei height
,
49 GLenum type
, GLvoid
*pixels
,
50 const struct gl_pixelstore_attrib
*packing
)
52 struct gl_framebuffer
*fb
= ctx
->ReadBuffer
;
53 struct gl_renderbuffer
*rb
= fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
55 int stride
, dstStride
, j
;
57 if (ctx
->Pixel
.DepthScale
!= 1.0 || ctx
->Pixel
.DepthBias
!= 0.0)
60 if (packing
->SwapBytes
)
63 if (_mesa_get_format_datatype(rb
->Format
) != GL_UNSIGNED_NORMALIZED
)
66 if (!((type
== GL_UNSIGNED_SHORT
&& rb
->Format
== MESA_FORMAT_Z16
) ||
67 type
== GL_UNSIGNED_INT
))
70 ctx
->Driver
.MapRenderbuffer(ctx
, rb
, x
, y
, width
, height
, GL_MAP_READ_BIT
,
74 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
75 return GL_TRUE
; /* don't bother trying the slow path */
78 dstStride
= _mesa_image_row_stride(packing
, width
, GL_DEPTH_COMPONENT
, type
);
79 dst
= (GLubyte
*) _mesa_image_address2d(packing
, pixels
, width
, height
,
80 GL_DEPTH_COMPONENT
, type
, 0, 0);
82 for (j
= 0; j
< height
; j
++) {
83 if (type
== GL_UNSIGNED_INT
) {
84 _mesa_unpack_uint_z_row(rb
->Format
, width
, map
, (GLuint
*)dst
);
86 ASSERT(type
== GL_UNSIGNED_SHORT
&& rb
->Format
== MESA_FORMAT_Z16
);
87 memcpy(dst
, map
, width
* 2);
93 ctx
->Driver
.UnmapRenderbuffer(ctx
, rb
);
99 * Read pixels for format=GL_DEPTH_COMPONENT.
102 read_depth_pixels( struct gl_context
*ctx
,
104 GLsizei width
, GLsizei height
,
105 GLenum type
, GLvoid
*pixels
,
106 const struct gl_pixelstore_attrib
*packing
)
108 struct gl_framebuffer
*fb
= ctx
->ReadBuffer
;
109 struct gl_renderbuffer
*rb
= fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
112 int dstStride
, stride
;
117 /* clipping should have been done already */
120 ASSERT(x
+ width
<= (GLint
) rb
->Width
);
121 ASSERT(y
+ height
<= (GLint
) rb
->Height
);
122 /* width should never be > MAX_WIDTH since we did clipping earlier */
123 ASSERT(width
<= MAX_WIDTH
);
125 if (fast_read_depth_pixels(ctx
, x
, y
, width
, height
, type
, pixels
, packing
))
128 dstStride
= _mesa_image_row_stride(packing
, width
, GL_DEPTH_COMPONENT
, type
);
129 dst
= (GLubyte
*) _mesa_image_address2d(packing
, pixels
, width
, height
,
130 GL_DEPTH_COMPONENT
, type
, 0, 0);
132 ctx
->Driver
.MapRenderbuffer(ctx
, rb
, x
, y
, width
, height
, GL_MAP_READ_BIT
,
135 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
139 /* General case (slower) */
140 for (j
= 0; j
< height
; j
++, y
++) {
141 GLfloat depthValues
[MAX_WIDTH
];
142 _mesa_unpack_float_z_row(rb
->Format
, width
, map
, depthValues
);
143 _mesa_pack_depth_span(ctx
, width
, dst
, type
, depthValues
, packing
);
149 ctx
->Driver
.UnmapRenderbuffer(ctx
, rb
);
154 * Read pixels for format=GL_STENCIL_INDEX.
157 read_stencil_pixels( struct gl_context
*ctx
,
159 GLsizei width
, GLsizei height
,
160 GLenum type
, GLvoid
*pixels
,
161 const struct gl_pixelstore_attrib
*packing
)
163 struct gl_framebuffer
*fb
= ctx
->ReadBuffer
;
164 struct gl_renderbuffer
*rb
= fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
172 /* width should never be > MAX_WIDTH since we did clipping earlier */
173 ASSERT(width
<= MAX_WIDTH
);
175 ctx
->Driver
.MapRenderbuffer(ctx
, rb
, x
, y
, width
, height
, GL_MAP_READ_BIT
,
178 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
182 /* process image row by row */
183 for (j
= 0; j
< height
; j
++) {
185 GLubyte stencil
[MAX_WIDTH
];
187 _mesa_unpack_ubyte_stencil_row(rb
->Format
, width
, map
, stencil
);
188 dest
= _mesa_image_address2d(packing
, pixels
, width
, height
,
189 GL_STENCIL_INDEX
, type
, j
, 0);
191 _mesa_pack_stencil_span(ctx
, width
, type
, dest
, stencil
, packing
);
196 ctx
->Driver
.UnmapRenderbuffer(ctx
, rb
);
200 fast_read_rgba_pixels_memcpy( struct gl_context
*ctx
,
202 GLsizei width
, GLsizei height
,
203 GLenum format
, GLenum type
,
205 const struct gl_pixelstore_attrib
*packing
,
206 GLbitfield transferOps
)
208 struct gl_renderbuffer
*rb
= ctx
->ReadBuffer
->_ColorReadBuffer
;
210 int dstStride
, stride
, j
, texelBytes
;
212 if (!_mesa_format_matches_format_and_type(rb
->Format
, format
, type
,
213 ctx
->Pack
.SwapBytes
))
216 dstStride
= _mesa_image_row_stride(packing
, width
, format
, type
);
217 dst
= (GLubyte
*) _mesa_image_address2d(packing
, pixels
, width
, height
,
220 ctx
->Driver
.MapRenderbuffer(ctx
, rb
, x
, y
, width
, height
, GL_MAP_READ_BIT
,
223 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
224 return GL_TRUE
; /* don't bother trying the slow path */
227 texelBytes
= _mesa_get_format_bytes(rb
->Format
);
228 for (j
= 0; j
< height
; j
++) {
229 memcpy(dst
, map
, width
* texelBytes
);
234 ctx
->Driver
.UnmapRenderbuffer(ctx
, rb
);
240 slow_read_rgba_pixels( struct gl_context
*ctx
,
242 GLsizei width
, GLsizei height
,
243 GLenum format
, GLenum type
,
245 const struct gl_pixelstore_attrib
*packing
,
246 GLbitfield transferOps
)
248 struct gl_renderbuffer
*rb
= ctx
->ReadBuffer
->_ColorReadBuffer
;
249 const gl_format rbFormat
= _mesa_get_srgb_format_linear(rb
->Format
);
252 int dstStride
, stride
, j
;
254 dstStride
= _mesa_image_row_stride(packing
, width
, format
, type
);
255 dst
= (GLubyte
*) _mesa_image_address2d(packing
, pixels
, width
, height
,
258 ctx
->Driver
.MapRenderbuffer(ctx
, rb
, x
, y
, width
, height
, GL_MAP_READ_BIT
,
261 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
265 rgba
= malloc(width
* MAX_PIXEL_BYTES
);
269 for (j
= 0; j
< height
; j
++) {
270 if (_mesa_is_integer_format(format
)) {
271 _mesa_unpack_uint_rgba_row(rbFormat
, width
, map
, (GLuint (*)[4]) rgba
);
272 _mesa_pack_rgba_span_int(ctx
, width
, (GLuint (*)[4]) rgba
, format
,
275 _mesa_unpack_rgba_row(rbFormat
, width
, map
, (GLfloat (*)[4]) rgba
);
276 _mesa_pack_rgba_span_float(ctx
, width
, (GLfloat (*)[4]) rgba
, format
,
277 type
, dst
, packing
, transferOps
);
286 ctx
->Driver
.UnmapRenderbuffer(ctx
, rb
);
290 * Read R, G, B, A, RGB, L, or LA pixels.
293 read_rgba_pixels( struct gl_context
*ctx
,
295 GLsizei width
, GLsizei height
,
296 GLenum format
, GLenum type
, GLvoid
*pixels
,
297 const struct gl_pixelstore_attrib
*packing
)
299 GLbitfield transferOps
= ctx
->_ImageTransferState
;
300 struct gl_framebuffer
*fb
= ctx
->ReadBuffer
;
301 struct gl_renderbuffer
*rb
= fb
->_ColorReadBuffer
;
306 if ((ctx
->Color
._ClampReadColor
== GL_TRUE
|| type
!= GL_FLOAT
) &&
307 !_mesa_is_integer_format(format
)) {
308 transferOps
|= IMAGE_CLAMP_BIT
;
312 /* Try the optimized paths first. */
313 if (fast_read_rgba_pixels_memcpy(ctx
, x
, y
, width
, height
,
314 format
, type
, pixels
, packing
,
320 slow_read_rgba_pixels(ctx
, x
, y
, width
, height
,
321 format
, type
, pixels
, packing
, transferOps
);
325 * For a packed depth/stencil buffer being read as depth/stencil, just memcpy the
326 * data (possibly swapping 8/24 vs 24/8 as we go).
329 fast_read_depth_stencil_pixels(struct gl_context
*ctx
,
331 GLsizei width
, GLsizei height
,
332 GLubyte
*dst
, int dstStride
)
334 struct gl_framebuffer
*fb
= ctx
->ReadBuffer
;
335 struct gl_renderbuffer
*rb
= fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
336 struct gl_renderbuffer
*stencilRb
= fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
343 if (rb
->Format
!= MESA_FORMAT_Z24_S8
&&
344 rb
->Format
!= MESA_FORMAT_S8_Z24
)
347 ctx
->Driver
.MapRenderbuffer(ctx
, rb
, x
, y
, width
, height
, GL_MAP_READ_BIT
,
350 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
351 return GL_TRUE
; /* don't bother trying the slow path */
354 for (i
= 0; i
< height
; i
++) {
355 _mesa_unpack_uint_24_8_depth_stencil_row(rb
->Format
, width
,
361 ctx
->Driver
.UnmapRenderbuffer(ctx
, rb
);
368 * For non-float-depth and stencil buffers being read as 24/8 depth/stencil,
369 * copy the integer data directly instead of converting depth to float and
373 fast_read_depth_stencil_pixels_separate(struct gl_context
*ctx
,
375 GLsizei width
, GLsizei height
,
376 uint32_t *dst
, int dstStride
)
378 struct gl_framebuffer
*fb
= ctx
->ReadBuffer
;
379 struct gl_renderbuffer
*depthRb
= fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
380 struct gl_renderbuffer
*stencilRb
= fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
381 GLubyte
*depthMap
, *stencilMap
;
382 int depthStride
, stencilStride
, i
, j
;
384 if (_mesa_get_format_datatype(depthRb
->Format
) != GL_UNSIGNED_NORMALIZED
)
387 ctx
->Driver
.MapRenderbuffer(ctx
, depthRb
, x
, y
, width
, height
,
388 GL_MAP_READ_BIT
, &depthMap
, &depthStride
);
390 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
391 return GL_TRUE
; /* don't bother trying the slow path */
394 ctx
->Driver
.MapRenderbuffer(ctx
, stencilRb
, x
, y
, width
, height
,
395 GL_MAP_READ_BIT
, &stencilMap
, &stencilStride
);
397 ctx
->Driver
.UnmapRenderbuffer(ctx
, depthRb
);
398 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
399 return GL_TRUE
; /* don't bother trying the slow path */
402 for (j
= 0; j
< height
; j
++) {
403 GLubyte stencilVals
[MAX_WIDTH
];
405 _mesa_unpack_uint_z_row(depthRb
->Format
, width
, depthMap
, dst
);
406 _mesa_unpack_ubyte_stencil_row(stencilRb
->Format
, width
,
407 stencilMap
, stencilVals
);
409 for (i
= 0; i
< width
; i
++) {
410 dst
[i
] = (dst
[i
] & 0xffffff00) | stencilVals
[i
];
413 depthMap
+= depthStride
;
414 stencilMap
+= stencilStride
;
415 dst
+= dstStride
/ 4;
418 ctx
->Driver
.UnmapRenderbuffer(ctx
, depthRb
);
419 ctx
->Driver
.UnmapRenderbuffer(ctx
, stencilRb
);
425 slow_read_depth_stencil_pixels_separate(struct gl_context
*ctx
,
427 GLsizei width
, GLsizei height
,
429 const struct gl_pixelstore_attrib
*packing
,
430 GLubyte
*dst
, int dstStride
)
432 struct gl_framebuffer
*fb
= ctx
->ReadBuffer
;
433 struct gl_renderbuffer
*depthRb
= fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
434 struct gl_renderbuffer
*stencilRb
= fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
435 GLubyte
*depthMap
, *stencilMap
;
436 int depthStride
, stencilStride
, j
;
438 /* The depth and stencil buffers might be separate, or a single buffer.
439 * If one buffer, only map it once.
441 ctx
->Driver
.MapRenderbuffer(ctx
, depthRb
, x
, y
, width
, height
,
442 GL_MAP_READ_BIT
, &depthMap
, &depthStride
);
444 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
448 if (stencilRb
!= depthRb
) {
449 ctx
->Driver
.MapRenderbuffer(ctx
, stencilRb
, x
, y
, width
, height
,
450 GL_MAP_READ_BIT
, &stencilMap
,
453 ctx
->Driver
.UnmapRenderbuffer(ctx
, depthRb
);
454 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
459 stencilMap
= depthMap
;
460 stencilStride
= depthStride
;
463 for (j
= 0; j
< height
; j
++) {
464 GLubyte stencilVals
[MAX_WIDTH
];
465 GLfloat depthVals
[MAX_WIDTH
];
467 _mesa_unpack_float_z_row(depthRb
->Format
, width
, depthMap
, depthVals
);
468 _mesa_unpack_ubyte_stencil_row(stencilRb
->Format
, width
,
469 stencilMap
, stencilVals
);
471 _mesa_pack_depth_stencil_span(ctx
, width
, type
, (GLuint
*)dst
,
472 depthVals
, stencilVals
, packing
);
474 depthMap
+= depthStride
;
475 stencilMap
+= stencilStride
;
479 ctx
->Driver
.UnmapRenderbuffer(ctx
, depthRb
);
480 if (stencilRb
!= depthRb
) {
481 ctx
->Driver
.UnmapRenderbuffer(ctx
, stencilRb
);
487 * Read combined depth/stencil values.
488 * We'll have already done error checking to be sure the expected
489 * depth and stencil buffers really exist.
492 read_depth_stencil_pixels(struct gl_context
*ctx
,
494 GLsizei width
, GLsizei height
,
495 GLenum type
, GLvoid
*pixels
,
496 const struct gl_pixelstore_attrib
*packing
)
498 const GLboolean scaleOrBias
499 = ctx
->Pixel
.DepthScale
!= 1.0 || ctx
->Pixel
.DepthBias
!= 0.0;
500 const GLboolean stencilTransfer
= ctx
->Pixel
.IndexShift
501 || ctx
->Pixel
.IndexOffset
|| ctx
->Pixel
.MapStencilFlag
;
505 dst
= (GLubyte
*) _mesa_image_address2d(packing
, pixels
,
507 GL_DEPTH_STENCIL_EXT
,
509 dstStride
= _mesa_image_row_stride(packing
, width
,
510 GL_DEPTH_STENCIL_EXT
, type
);
512 /* Fast 24/8 reads. */
513 if (type
== GL_UNSIGNED_INT_24_8
&&
514 !scaleOrBias
&& !stencilTransfer
&& !packing
->SwapBytes
) {
515 if (fast_read_depth_stencil_pixels(ctx
, x
, y
, width
, height
,
519 if (fast_read_depth_stencil_pixels_separate(ctx
, x
, y
, width
, height
,
520 (uint32_t *)dst
, dstStride
))
524 slow_read_depth_stencil_pixels_separate(ctx
, x
, y
, width
, height
,
532 * Software fallback routine for ctx->Driver.ReadPixels().
533 * By time we get here, all error checking will have been done.
536 _mesa_readpixels(struct gl_context
*ctx
,
537 GLint x
, GLint y
, GLsizei width
, GLsizei height
,
538 GLenum format
, GLenum type
,
539 const struct gl_pixelstore_attrib
*packing
,
542 struct gl_pixelstore_attrib clippedPacking
= *packing
;
545 _mesa_update_state(ctx
);
547 /* Do all needed clipping here, so that we can forget about it later */
548 if (_mesa_clip_readpixels(ctx
, &x
, &y
, &width
, &height
, &clippedPacking
)) {
550 pixels
= _mesa_map_pbo_dest(ctx
, &clippedPacking
, pixels
);
554 case GL_STENCIL_INDEX
:
555 read_stencil_pixels(ctx
, x
, y
, width
, height
, type
, pixels
,
558 case GL_DEPTH_COMPONENT
:
559 read_depth_pixels(ctx
, x
, y
, width
, height
, type
, pixels
,
562 case GL_DEPTH_STENCIL_EXT
:
563 read_depth_stencil_pixels(ctx
, x
, y
, width
, height
, type
, pixels
,
567 /* all other formats should be color formats */
568 read_rgba_pixels(ctx
, x
, y
, width
, height
, format
, type
, pixels
,
572 _mesa_unmap_pbo_dest(ctx
, &clippedPacking
);
579 * Do error checking of the format/type parameters to glReadPixels and
581 * \param drawing if GL_TRUE do checking for DrawPixels, else do checking
583 * \return GL_TRUE if error detected, GL_FALSE if no errors
586 _mesa_error_check_format_type(struct gl_context
*ctx
, GLenum format
,
587 GLenum type
, GLboolean drawing
)
589 const char *readDraw
= drawing
? "Draw" : "Read";
590 const GLboolean reading
= !drawing
;
592 /* state validation should have already been done */
593 ASSERT(ctx
->NewState
== 0x0);
595 if (ctx
->Extensions
.EXT_packed_depth_stencil
596 && type
== GL_UNSIGNED_INT_24_8_EXT
597 && format
!= GL_DEPTH_STENCIL_EXT
) {
598 _mesa_error(ctx
, GL_INVALID_OPERATION
,
599 "gl%sPixels(format is not GL_DEPTH_STENCIL_EXT)", readDraw
);
603 if (ctx
->Extensions
.ARB_depth_buffer_float
604 && type
== GL_FLOAT_32_UNSIGNED_INT_24_8_REV
605 && format
!= GL_DEPTH_STENCIL_EXT
) {
606 _mesa_error(ctx
, GL_INVALID_OPERATION
,
607 "gl%sPixels(format is not GL_DEPTH_STENCIL_EXT)", readDraw
);
611 /* basic combinations test */
612 if (!_mesa_is_legal_format_and_type(ctx
, format
, type
)) {
613 _mesa_error(ctx
, GL_INVALID_ENUM
,
614 "gl%sPixels(format or type)", readDraw
);
618 /* additional checks */
626 case GL_LUMINANCE_ALPHA
:
632 case GL_RED_INTEGER_EXT
:
633 case GL_GREEN_INTEGER_EXT
:
634 case GL_BLUE_INTEGER_EXT
:
635 case GL_ALPHA_INTEGER_EXT
:
636 case GL_RGB_INTEGER_EXT
:
637 case GL_RGBA_INTEGER_EXT
:
638 case GL_BGR_INTEGER_EXT
:
639 case GL_BGRA_INTEGER_EXT
:
640 case GL_LUMINANCE_INTEGER_EXT
:
641 case GL_LUMINANCE_ALPHA_INTEGER_EXT
:
644 if (!_mesa_source_buffer_exists(ctx
, GL_COLOR
)) {
645 _mesa_error(ctx
, GL_INVALID_OPERATION
,
646 "glReadPixels(no color buffer)");
653 if (ctx
->PixelMaps
.ItoR
.Size
== 0 ||
654 ctx
->PixelMaps
.ItoG
.Size
== 0 ||
655 ctx
->PixelMaps
.ItoB
.Size
== 0) {
656 _mesa_error(ctx
, GL_INVALID_OPERATION
,
657 "glDrawPixels(drawing color index pixels into RGB buffer)");
663 if (!_mesa_source_buffer_exists(ctx
, GL_COLOR
)) {
664 _mesa_error(ctx
, GL_INVALID_OPERATION
,
665 "glReadPixels(no color buffer)");
668 /* We no longer support CI-mode color buffers so trying to read
669 * GL_COLOR_INDEX pixels is always an error.
671 _mesa_error(ctx
, GL_INVALID_OPERATION
,
672 "glReadPixels(color buffer is RGB)");
676 case GL_STENCIL_INDEX
:
677 if ((drawing
&& !_mesa_dest_buffer_exists(ctx
, format
)) ||
678 (reading
&& !_mesa_source_buffer_exists(ctx
, format
))) {
679 _mesa_error(ctx
, GL_INVALID_OPERATION
,
680 "gl%sPixels(no stencil buffer)", readDraw
);
684 case GL_DEPTH_COMPONENT
:
685 if ((drawing
&& !_mesa_dest_buffer_exists(ctx
, format
))) {
686 _mesa_error(ctx
, GL_INVALID_OPERATION
,
687 "gl%sPixels(no depth buffer)", readDraw
);
691 case GL_DEPTH_STENCIL_EXT
:
692 /* Check validity of the type first. */
694 case GL_UNSIGNED_INT_24_8_EXT
:
695 if (!ctx
->Extensions
.EXT_packed_depth_stencil
) {
696 _mesa_error(ctx
, GL_INVALID_ENUM
, "gl%sPixels(type)", readDraw
);
700 case GL_FLOAT_32_UNSIGNED_INT_24_8_REV
:
701 if (!ctx
->Extensions
.ARB_depth_buffer_float
) {
702 _mesa_error(ctx
, GL_INVALID_ENUM
, "gl%sPixels(type)", readDraw
);
707 _mesa_error(ctx
, GL_INVALID_ENUM
, "gl%sPixels(type)", readDraw
);
710 if ((drawing
&& !_mesa_dest_buffer_exists(ctx
, format
)) ||
711 (reading
&& !_mesa_source_buffer_exists(ctx
, format
))) {
712 _mesa_error(ctx
, GL_INVALID_OPERATION
,
713 "gl%sPixels(no depth or stencil buffer)", readDraw
);
718 /* this should have been caught in _mesa_is_legal_format_type() */
719 _mesa_problem(ctx
, "unexpected format in _mesa_%sPixels", readDraw
);
730 _mesa_ReadnPixelsARB( GLint x
, GLint y
, GLsizei width
, GLsizei height
,
731 GLenum format
, GLenum type
, GLsizei bufSize
,
734 GET_CURRENT_CONTEXT(ctx
);
735 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
737 FLUSH_CURRENT(ctx
, 0);
739 if (MESA_VERBOSE
& VERBOSE_API
)
740 _mesa_debug(ctx
, "glReadPixels(%d, %d, %s, %s, %p)\n",
742 _mesa_lookup_enum_by_nr(format
),
743 _mesa_lookup_enum_by_nr(type
),
746 if (width
< 0 || height
< 0) {
747 _mesa_error( ctx
, GL_INVALID_VALUE
,
748 "glReadPixels(width=%d height=%d)", width
, height
);
753 _mesa_update_state(ctx
);
755 if (_mesa_error_check_format_type(ctx
, format
, type
, GL_FALSE
)) {
760 /* Check that the destination format and source buffer are both
761 * integer-valued or both non-integer-valued.
763 if (ctx
->Extensions
.EXT_texture_integer
&& _mesa_is_color_format(format
)) {
764 const struct gl_renderbuffer
*rb
= ctx
->ReadBuffer
->_ColorReadBuffer
;
765 const GLboolean srcInteger
= _mesa_is_format_integer_color(rb
->Format
);
766 const GLboolean dstInteger
= _mesa_is_integer_format(format
);
767 if (dstInteger
!= srcInteger
) {
768 _mesa_error(ctx
, GL_INVALID_OPERATION
,
769 "glReadPixels(integer / non-integer format mismatch");
774 if (ctx
->ReadBuffer
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
775 _mesa_error(ctx
, GL_INVALID_FRAMEBUFFER_OPERATION_EXT
,
776 "glReadPixels(incomplete framebuffer)" );
780 if (ctx
->ReadBuffer
->Name
!= 0 && ctx
->ReadBuffer
->Visual
.samples
> 0) {
781 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glReadPixels(multisample FBO)");
785 if (!_mesa_source_buffer_exists(ctx
, format
)) {
786 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glReadPixels(no readbuffer)");
790 if (width
== 0 || height
== 0)
791 return; /* nothing to do */
793 if (!_mesa_validate_pbo_access(2, &ctx
->Pack
, width
, height
, 1,
794 format
, type
, bufSize
, pixels
)) {
795 if (_mesa_is_bufferobj(ctx
->Pack
.BufferObj
)) {
796 _mesa_error(ctx
, GL_INVALID_OPERATION
,
797 "glReadPixels(out of bounds PBO access)");
799 _mesa_error(ctx
, GL_INVALID_OPERATION
,
800 "glReadnPixelsARB(out of bounds access:"
801 " bufSize (%d) is too small)", bufSize
);
806 if (_mesa_is_bufferobj(ctx
->Pack
.BufferObj
) &&
807 _mesa_bufferobj_mapped(ctx
->Pack
.BufferObj
)) {
808 /* buffer is mapped - that's an error */
809 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glReadPixels(PBO is mapped)");
813 ctx
->Driver
.ReadPixels(ctx
, x
, y
, width
, height
,
814 format
, type
, &ctx
->Pack
, pixels
);
818 _mesa_ReadPixels( GLint x
, GLint y
, GLsizei width
, GLsizei height
,
819 GLenum format
, GLenum type
, GLvoid
*pixels
)
821 _mesa_ReadnPixelsARB(x
, y
, width
, height
, format
, type
, INT_MAX
, pixels
);