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
))
215 /* check for things we can't handle here */
216 if (packing
->SwapBytes
) {
220 dstStride
= _mesa_image_row_stride(packing
, width
, format
, type
);
221 dst
= (GLubyte
*) _mesa_image_address2d(packing
, pixels
, width
, height
,
224 ctx
->Driver
.MapRenderbuffer(ctx
, rb
, x
, y
, width
, height
, GL_MAP_READ_BIT
,
227 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
228 return GL_TRUE
; /* don't bother trying the slow path */
231 texelBytes
= _mesa_get_format_bytes(rb
->Format
);
232 for (j
= 0; j
< height
; j
++) {
233 memcpy(dst
, map
, width
* texelBytes
);
238 ctx
->Driver
.UnmapRenderbuffer(ctx
, rb
);
244 slow_read_rgba_pixels( struct gl_context
*ctx
,
246 GLsizei width
, GLsizei height
,
247 GLenum format
, GLenum type
,
249 const struct gl_pixelstore_attrib
*packing
,
250 GLbitfield transferOps
)
252 struct gl_renderbuffer
*rb
= ctx
->ReadBuffer
->_ColorReadBuffer
;
253 const gl_format rbFormat
= _mesa_get_srgb_format_linear(rb
->Format
);
256 int dstStride
, stride
, j
;
258 dstStride
= _mesa_image_row_stride(packing
, width
, format
, type
);
259 dst
= (GLubyte
*) _mesa_image_address2d(packing
, pixels
, width
, height
,
262 ctx
->Driver
.MapRenderbuffer(ctx
, rb
, x
, y
, width
, height
, GL_MAP_READ_BIT
,
265 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
269 rgba
= malloc(width
* MAX_PIXEL_BYTES
);
273 for (j
= 0; j
< height
; j
++) {
274 if (_mesa_is_integer_format(format
)) {
275 _mesa_unpack_uint_rgba_row(rbFormat
, width
, map
, (GLuint (*)[4]) rgba
);
276 _mesa_pack_rgba_span_int(ctx
, width
, (GLuint (*)[4]) rgba
, format
,
279 _mesa_unpack_rgba_row(rbFormat
, width
, map
, (GLfloat (*)[4]) rgba
);
280 _mesa_pack_rgba_span_float(ctx
, width
, (GLfloat (*)[4]) rgba
, format
,
281 type
, dst
, packing
, transferOps
);
290 ctx
->Driver
.UnmapRenderbuffer(ctx
, rb
);
294 * Read R, G, B, A, RGB, L, or LA pixels.
297 read_rgba_pixels( struct gl_context
*ctx
,
299 GLsizei width
, GLsizei height
,
300 GLenum format
, GLenum type
, GLvoid
*pixels
,
301 const struct gl_pixelstore_attrib
*packing
)
303 GLbitfield transferOps
= ctx
->_ImageTransferState
;
304 struct gl_framebuffer
*fb
= ctx
->ReadBuffer
;
305 struct gl_renderbuffer
*rb
= fb
->_ColorReadBuffer
;
310 if ((ctx
->Color
._ClampReadColor
== GL_TRUE
|| type
!= GL_FLOAT
) &&
311 !_mesa_is_integer_format(format
)) {
312 transferOps
|= IMAGE_CLAMP_BIT
;
316 /* Try the optimized paths first. */
317 if (fast_read_rgba_pixels_memcpy(ctx
, x
, y
, width
, height
,
318 format
, type
, pixels
, packing
,
324 slow_read_rgba_pixels(ctx
, x
, y
, width
, height
,
325 format
, type
, pixels
, packing
, transferOps
);
329 * For a packed depth/stencil buffer being read as depth/stencil, just memcpy the
330 * data (possibly swapping 8/24 vs 24/8 as we go).
333 fast_read_depth_stencil_pixels(struct gl_context
*ctx
,
335 GLsizei width
, GLsizei height
,
336 GLubyte
*dst
, int dstStride
)
338 struct gl_framebuffer
*fb
= ctx
->ReadBuffer
;
339 struct gl_renderbuffer
*rb
= fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
340 struct gl_renderbuffer
*stencilRb
= fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
347 if (rb
->Format
!= MESA_FORMAT_Z24_S8
&&
348 rb
->Format
!= MESA_FORMAT_S8_Z24
)
351 ctx
->Driver
.MapRenderbuffer(ctx
, rb
, x
, y
, width
, height
, GL_MAP_READ_BIT
,
354 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
355 return GL_TRUE
; /* don't bother trying the slow path */
358 for (i
= 0; i
< height
; i
++) {
359 _mesa_unpack_uint_24_8_depth_stencil_row(rb
->Format
, width
,
365 ctx
->Driver
.UnmapRenderbuffer(ctx
, rb
);
372 * For non-float-depth and stencil buffers being read as 24/8 depth/stencil,
373 * copy the integer data directly instead of converting depth to float and
377 fast_read_depth_stencil_pixels_separate(struct gl_context
*ctx
,
379 GLsizei width
, GLsizei height
,
380 uint32_t *dst
, int dstStride
)
382 struct gl_framebuffer
*fb
= ctx
->ReadBuffer
;
383 struct gl_renderbuffer
*depthRb
= fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
384 struct gl_renderbuffer
*stencilRb
= fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
385 GLubyte
*depthMap
, *stencilMap
;
386 int depthStride
, stencilStride
, i
, j
;
388 if (_mesa_get_format_datatype(depthRb
->Format
) != GL_UNSIGNED_NORMALIZED
)
391 ctx
->Driver
.MapRenderbuffer(ctx
, depthRb
, x
, y
, width
, height
,
392 GL_MAP_READ_BIT
, &depthMap
, &depthStride
);
394 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
395 return GL_TRUE
; /* don't bother trying the slow path */
398 ctx
->Driver
.MapRenderbuffer(ctx
, stencilRb
, x
, y
, width
, height
,
399 GL_MAP_READ_BIT
, &stencilMap
, &stencilStride
);
401 ctx
->Driver
.UnmapRenderbuffer(ctx
, depthRb
);
402 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
403 return GL_TRUE
; /* don't bother trying the slow path */
406 for (j
= 0; j
< height
; j
++) {
407 GLubyte stencilVals
[MAX_WIDTH
];
409 _mesa_unpack_uint_z_row(depthRb
->Format
, width
, depthMap
, dst
);
410 _mesa_unpack_ubyte_stencil_row(stencilRb
->Format
, width
,
411 stencilMap
, stencilVals
);
413 for (i
= 0; i
< width
; i
++) {
414 dst
[i
] = (dst
[i
] & 0xffffff00) | stencilVals
[i
];
417 depthMap
+= depthStride
;
418 stencilMap
+= stencilStride
;
419 dst
+= dstStride
/ 4;
422 ctx
->Driver
.UnmapRenderbuffer(ctx
, depthRb
);
423 ctx
->Driver
.UnmapRenderbuffer(ctx
, stencilRb
);
429 slow_read_depth_stencil_pixels_separate(struct gl_context
*ctx
,
431 GLsizei width
, GLsizei height
,
433 const struct gl_pixelstore_attrib
*packing
,
434 GLubyte
*dst
, int dstStride
)
436 struct gl_framebuffer
*fb
= ctx
->ReadBuffer
;
437 struct gl_renderbuffer
*depthRb
= fb
->Attachment
[BUFFER_DEPTH
].Renderbuffer
;
438 struct gl_renderbuffer
*stencilRb
= fb
->Attachment
[BUFFER_STENCIL
].Renderbuffer
;
439 GLubyte
*depthMap
, *stencilMap
;
440 int depthStride
, stencilStride
, j
;
442 /* The depth and stencil buffers might be separate, or a single buffer.
443 * If one buffer, only map it once.
445 ctx
->Driver
.MapRenderbuffer(ctx
, depthRb
, x
, y
, width
, height
,
446 GL_MAP_READ_BIT
, &depthMap
, &depthStride
);
448 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
452 if (stencilRb
!= depthRb
) {
453 ctx
->Driver
.MapRenderbuffer(ctx
, stencilRb
, x
, y
, width
, height
,
454 GL_MAP_READ_BIT
, &stencilMap
,
457 ctx
->Driver
.UnmapRenderbuffer(ctx
, depthRb
);
458 _mesa_error(ctx
, GL_OUT_OF_MEMORY
, "glReadPixels");
463 stencilMap
= depthMap
;
464 stencilStride
= depthStride
;
467 for (j
= 0; j
< height
; j
++) {
468 GLubyte stencilVals
[MAX_WIDTH
];
469 GLfloat depthVals
[MAX_WIDTH
];
471 _mesa_unpack_float_z_row(depthRb
->Format
, width
, depthMap
, depthVals
);
472 _mesa_unpack_ubyte_stencil_row(stencilRb
->Format
, width
,
473 stencilMap
, stencilVals
);
475 _mesa_pack_depth_stencil_span(ctx
, width
, type
, (GLuint
*)dst
,
476 depthVals
, stencilVals
, packing
);
478 depthMap
+= depthStride
;
479 stencilMap
+= stencilStride
;
483 ctx
->Driver
.UnmapRenderbuffer(ctx
, depthRb
);
484 if (stencilRb
!= depthRb
) {
485 ctx
->Driver
.UnmapRenderbuffer(ctx
, stencilRb
);
491 * Read combined depth/stencil values.
492 * We'll have already done error checking to be sure the expected
493 * depth and stencil buffers really exist.
496 read_depth_stencil_pixels(struct gl_context
*ctx
,
498 GLsizei width
, GLsizei height
,
499 GLenum type
, GLvoid
*pixels
,
500 const struct gl_pixelstore_attrib
*packing
)
502 const GLboolean scaleOrBias
503 = ctx
->Pixel
.DepthScale
!= 1.0 || ctx
->Pixel
.DepthBias
!= 0.0;
504 const GLboolean stencilTransfer
= ctx
->Pixel
.IndexShift
505 || ctx
->Pixel
.IndexOffset
|| ctx
->Pixel
.MapStencilFlag
;
509 dst
= (GLubyte
*) _mesa_image_address2d(packing
, pixels
,
511 GL_DEPTH_STENCIL_EXT
,
513 dstStride
= _mesa_image_row_stride(packing
, width
,
514 GL_DEPTH_STENCIL_EXT
, type
);
516 /* Fast 24/8 reads. */
517 if (type
== GL_UNSIGNED_INT_24_8
&&
518 !scaleOrBias
&& !stencilTransfer
&& !packing
->SwapBytes
) {
519 if (fast_read_depth_stencil_pixels(ctx
, x
, y
, width
, height
,
523 if (fast_read_depth_stencil_pixels_separate(ctx
, x
, y
, width
, height
,
524 (uint32_t *)dst
, dstStride
))
528 slow_read_depth_stencil_pixels_separate(ctx
, x
, y
, width
, height
,
536 * Software fallback routine for ctx->Driver.ReadPixels().
537 * By time we get here, all error checking will have been done.
540 _mesa_readpixels(struct gl_context
*ctx
,
541 GLint x
, GLint y
, GLsizei width
, GLsizei height
,
542 GLenum format
, GLenum type
,
543 const struct gl_pixelstore_attrib
*packing
,
546 struct gl_pixelstore_attrib clippedPacking
= *packing
;
549 _mesa_update_state(ctx
);
551 /* Do all needed clipping here, so that we can forget about it later */
552 if (_mesa_clip_readpixels(ctx
, &x
, &y
, &width
, &height
, &clippedPacking
)) {
554 pixels
= _mesa_map_pbo_dest(ctx
, &clippedPacking
, pixels
);
558 case GL_STENCIL_INDEX
:
559 read_stencil_pixels(ctx
, x
, y
, width
, height
, type
, pixels
,
562 case GL_DEPTH_COMPONENT
:
563 read_depth_pixels(ctx
, x
, y
, width
, height
, type
, pixels
,
566 case GL_DEPTH_STENCIL_EXT
:
567 read_depth_stencil_pixels(ctx
, x
, y
, width
, height
, type
, pixels
,
571 /* all other formats should be color formats */
572 read_rgba_pixels(ctx
, x
, y
, width
, height
, format
, type
, pixels
,
576 _mesa_unmap_pbo_dest(ctx
, &clippedPacking
);
583 * Do error checking of the format/type parameters to glReadPixels and
585 * \param drawing if GL_TRUE do checking for DrawPixels, else do checking
587 * \return GL_TRUE if error detected, GL_FALSE if no errors
590 _mesa_error_check_format_type(struct gl_context
*ctx
, GLenum format
,
591 GLenum type
, GLboolean drawing
)
593 const char *readDraw
= drawing
? "Draw" : "Read";
594 const GLboolean reading
= !drawing
;
596 /* state validation should have already been done */
597 ASSERT(ctx
->NewState
== 0x0);
599 if (ctx
->Extensions
.EXT_packed_depth_stencil
600 && type
== GL_UNSIGNED_INT_24_8_EXT
601 && format
!= GL_DEPTH_STENCIL_EXT
) {
602 _mesa_error(ctx
, GL_INVALID_OPERATION
,
603 "gl%sPixels(format is not GL_DEPTH_STENCIL_EXT)", readDraw
);
607 if (ctx
->Extensions
.ARB_depth_buffer_float
608 && type
== GL_FLOAT_32_UNSIGNED_INT_24_8_REV
609 && format
!= GL_DEPTH_STENCIL_EXT
) {
610 _mesa_error(ctx
, GL_INVALID_OPERATION
,
611 "gl%sPixels(format is not GL_DEPTH_STENCIL_EXT)", readDraw
);
615 /* basic combinations test */
616 if (!_mesa_is_legal_format_and_type(ctx
, format
, type
)) {
617 _mesa_error(ctx
, GL_INVALID_ENUM
,
618 "gl%sPixels(format or type)", readDraw
);
622 /* additional checks */
630 case GL_LUMINANCE_ALPHA
:
636 case GL_RED_INTEGER_EXT
:
637 case GL_GREEN_INTEGER_EXT
:
638 case GL_BLUE_INTEGER_EXT
:
639 case GL_ALPHA_INTEGER_EXT
:
640 case GL_RGB_INTEGER_EXT
:
641 case GL_RGBA_INTEGER_EXT
:
642 case GL_BGR_INTEGER_EXT
:
643 case GL_BGRA_INTEGER_EXT
:
644 case GL_LUMINANCE_INTEGER_EXT
:
645 case GL_LUMINANCE_ALPHA_INTEGER_EXT
:
648 if (!_mesa_source_buffer_exists(ctx
, GL_COLOR
)) {
649 _mesa_error(ctx
, GL_INVALID_OPERATION
,
650 "glReadPixels(no color buffer)");
657 if (ctx
->PixelMaps
.ItoR
.Size
== 0 ||
658 ctx
->PixelMaps
.ItoG
.Size
== 0 ||
659 ctx
->PixelMaps
.ItoB
.Size
== 0) {
660 _mesa_error(ctx
, GL_INVALID_OPERATION
,
661 "glDrawPixels(drawing color index pixels into RGB buffer)");
667 if (!_mesa_source_buffer_exists(ctx
, GL_COLOR
)) {
668 _mesa_error(ctx
, GL_INVALID_OPERATION
,
669 "glReadPixels(no color buffer)");
672 /* We no longer support CI-mode color buffers so trying to read
673 * GL_COLOR_INDEX pixels is always an error.
675 _mesa_error(ctx
, GL_INVALID_OPERATION
,
676 "glReadPixels(color buffer is RGB)");
680 case GL_STENCIL_INDEX
:
681 if ((drawing
&& !_mesa_dest_buffer_exists(ctx
, format
)) ||
682 (reading
&& !_mesa_source_buffer_exists(ctx
, format
))) {
683 _mesa_error(ctx
, GL_INVALID_OPERATION
,
684 "gl%sPixels(no stencil buffer)", readDraw
);
688 case GL_DEPTH_COMPONENT
:
689 if ((drawing
&& !_mesa_dest_buffer_exists(ctx
, format
))) {
690 _mesa_error(ctx
, GL_INVALID_OPERATION
,
691 "gl%sPixels(no depth buffer)", readDraw
);
695 case GL_DEPTH_STENCIL_EXT
:
696 /* Check validity of the type first. */
698 case GL_UNSIGNED_INT_24_8_EXT
:
699 if (!ctx
->Extensions
.EXT_packed_depth_stencil
) {
700 _mesa_error(ctx
, GL_INVALID_ENUM
, "gl%sPixels(type)", readDraw
);
704 case GL_FLOAT_32_UNSIGNED_INT_24_8_REV
:
705 if (!ctx
->Extensions
.ARB_depth_buffer_float
) {
706 _mesa_error(ctx
, GL_INVALID_ENUM
, "gl%sPixels(type)", readDraw
);
711 _mesa_error(ctx
, GL_INVALID_ENUM
, "gl%sPixels(type)", readDraw
);
714 if ((drawing
&& !_mesa_dest_buffer_exists(ctx
, format
)) ||
715 (reading
&& !_mesa_source_buffer_exists(ctx
, format
))) {
716 _mesa_error(ctx
, GL_INVALID_OPERATION
,
717 "gl%sPixels(no depth or stencil buffer)", readDraw
);
722 /* this should have been caught in _mesa_is_legal_format_type() */
723 _mesa_problem(ctx
, "unexpected format in _mesa_%sPixels", readDraw
);
734 _mesa_ReadnPixelsARB( GLint x
, GLint y
, GLsizei width
, GLsizei height
,
735 GLenum format
, GLenum type
, GLsizei bufSize
,
738 GET_CURRENT_CONTEXT(ctx
);
739 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
741 FLUSH_CURRENT(ctx
, 0);
743 if (MESA_VERBOSE
& VERBOSE_API
)
744 _mesa_debug(ctx
, "glReadPixels(%d, %d, %s, %s, %p)\n",
746 _mesa_lookup_enum_by_nr(format
),
747 _mesa_lookup_enum_by_nr(type
),
750 if (width
< 0 || height
< 0) {
751 _mesa_error( ctx
, GL_INVALID_VALUE
,
752 "glReadPixels(width=%d height=%d)", width
, height
);
757 _mesa_update_state(ctx
);
759 if (_mesa_error_check_format_type(ctx
, format
, type
, GL_FALSE
)) {
764 /* Check that the destination format and source buffer are both
765 * integer-valued or both non-integer-valued.
767 if (ctx
->Extensions
.EXT_texture_integer
&& _mesa_is_color_format(format
)) {
768 const struct gl_renderbuffer
*rb
= ctx
->ReadBuffer
->_ColorReadBuffer
;
769 const GLboolean srcInteger
= _mesa_is_format_integer_color(rb
->Format
);
770 const GLboolean dstInteger
= _mesa_is_integer_format(format
);
771 if (dstInteger
!= srcInteger
) {
772 _mesa_error(ctx
, GL_INVALID_OPERATION
,
773 "glReadPixels(integer / non-integer format mismatch");
778 if (ctx
->ReadBuffer
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
779 _mesa_error(ctx
, GL_INVALID_FRAMEBUFFER_OPERATION_EXT
,
780 "glReadPixels(incomplete framebuffer)" );
784 if (ctx
->ReadBuffer
->Name
!= 0 && ctx
->ReadBuffer
->Visual
.samples
> 0) {
785 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glReadPixels(multisample FBO)");
789 if (!_mesa_source_buffer_exists(ctx
, format
)) {
790 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glReadPixels(no readbuffer)");
794 if (width
== 0 || height
== 0)
795 return; /* nothing to do */
797 if (!_mesa_validate_pbo_access(2, &ctx
->Pack
, width
, height
, 1,
798 format
, type
, bufSize
, pixels
)) {
799 if (_mesa_is_bufferobj(ctx
->Pack
.BufferObj
)) {
800 _mesa_error(ctx
, GL_INVALID_OPERATION
,
801 "glReadPixels(out of bounds PBO access)");
803 _mesa_error(ctx
, GL_INVALID_OPERATION
,
804 "glReadnPixelsARB(out of bounds access:"
805 " bufSize (%d) is too small)", bufSize
);
810 if (_mesa_is_bufferobj(ctx
->Pack
.BufferObj
) &&
811 _mesa_bufferobj_mapped(ctx
->Pack
.BufferObj
)) {
812 /* buffer is mapped - that's an error */
813 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glReadPixels(PBO is mapped)");
817 ctx
->Driver
.ReadPixels(ctx
, x
, y
, width
, height
,
818 format
, type
, &ctx
->Pack
, pixels
);
822 _mesa_ReadPixels( GLint x
, GLint y
, GLsizei width
, GLsizei height
,
823 GLenum format
, GLenum type
, GLvoid
*pixels
)
825 _mesa_ReadnPixelsARB(x
, y
, width
, height
, format
, type
, INT_MAX
, pixels
);