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"
30 #include "framebuffer.h"
36 * Do error checking of the format/type parameters to glReadPixels and
38 * \param drawing if GL_TRUE do checking for DrawPixels, else do checking
40 * \return GL_TRUE if error detected, GL_FALSE if no errors
43 _mesa_error_check_format_type(GLcontext
*ctx
, GLenum format
, GLenum type
,
46 const char *readDraw
= drawing
? "Draw" : "Read";
48 if (ctx
->Extensions
.EXT_packed_depth_stencil
49 && type
== GL_UNSIGNED_INT_24_8_EXT
50 && format
!= GL_DEPTH_STENCIL_EXT
) {
51 _mesa_error(ctx
, GL_INVALID_OPERATION
,
52 "gl%sPixels(format is not GL_DEPTH_STENCIL_EXT)", readDraw
);
56 /* basic combinations test */
57 if (!_mesa_is_legal_format_and_type(ctx
, format
, type
)) {
58 _mesa_error(ctx
, GL_INVALID_ENUM
,
59 "gl%sPixels(format or type)", readDraw
);
63 /* additional checks */
70 case GL_LUMINANCE_ALPHA
:
76 if (drawing
&& !ctx
->Visual
.rgbMode
) {
77 _mesa_error(ctx
, GL_INVALID_OPERATION
,
78 "glDrawPixels(drawing RGB pixels into color index buffer)");
81 if (!drawing
&& !_mesa_dest_buffer_exists(ctx
, GL_COLOR
)) {
82 _mesa_error(ctx
, GL_INVALID_OPERATION
,
83 "glReadPixels(no color buffer)");
88 if (!drawing
&& ctx
->Visual
.rgbMode
) {
89 _mesa_error(ctx
, GL_INVALID_OPERATION
,
90 "glReadPixels(reading color index format from RGB buffer)");
93 if (!drawing
&& !_mesa_dest_buffer_exists(ctx
, GL_COLOR
)) {
94 _mesa_error(ctx
, GL_INVALID_OPERATION
,
95 "glReadPixels(no color buffer)");
99 case GL_STENCIL_INDEX
:
100 if ((drawing
&& !_mesa_dest_buffer_exists(ctx
, format
)) ||
101 (!drawing
&& !_mesa_source_buffer_exists(ctx
, format
))) {
102 _mesa_error(ctx
, GL_INVALID_OPERATION
,
103 "gl%sPixels(no stencil buffer)", readDraw
);
107 case GL_DEPTH_COMPONENT
:
108 if ((drawing
&& !_mesa_dest_buffer_exists(ctx
, format
)) ||
109 (!drawing
&& !_mesa_source_buffer_exists(ctx
, format
))) {
110 _mesa_error(ctx
, GL_INVALID_OPERATION
,
111 "gl%sPixels(no depth buffer)", readDraw
);
115 case GL_DEPTH_STENCIL_EXT
:
116 if (!ctx
->Extensions
.EXT_packed_depth_stencil
||
117 type
!= GL_UNSIGNED_INT_24_8_EXT
) {
118 _mesa_error(ctx
, GL_INVALID_ENUM
, "gl%sPixels(type)", readDraw
);
121 if ((drawing
&& !_mesa_dest_buffer_exists(ctx
, format
)) ||
122 (!drawing
&& !_mesa_source_buffer_exists(ctx
, format
))) {
123 _mesa_error(ctx
, GL_INVALID_OPERATION
,
124 "gl%sPixels(no depth or stencil buffer)", readDraw
);
129 /* this should have been caught in _mesa_is_legal_format_type() */
130 _mesa_problem(ctx
, "unexpected format in _mesa_%sPixels", readDraw
);
141 _mesa_ReadPixels( GLint x
, GLint y
, GLsizei width
, GLsizei height
,
142 GLenum format
, GLenum type
, GLvoid
*pixels
)
144 GET_CURRENT_CONTEXT(ctx
);
145 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
147 FLUSH_CURRENT(ctx
, 0);
149 if (width
< 0 || height
< 0) {
150 _mesa_error( ctx
, GL_INVALID_VALUE
,
151 "glReadPixels(width=%d height=%d)", width
, height
);
156 _mesa_update_state(ctx
);
158 if (_mesa_error_check_format_type(ctx
, format
, type
, GL_FALSE
)) {
163 if (ctx
->ReadBuffer
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
164 _mesa_error(ctx
, GL_INVALID_FRAMEBUFFER_OPERATION_EXT
,
165 "glReadPixels(incomplete framebuffer)" );
169 if (!_mesa_source_buffer_exists(ctx
, format
)) {
170 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glReadPixels(no readbuffer)");
174 if (ctx
->Pack
.BufferObj
->Name
) {
175 if (!_mesa_validate_pbo_access(2, &ctx
->Pack
, width
, height
, 1,
176 format
, type
, pixels
)) {
177 _mesa_error(ctx
, GL_INVALID_OPERATION
,
178 "glReadPixels(invalid PBO access)");
182 if (ctx
->Pack
.BufferObj
->Pointer
) {
183 /* buffer is mapped - that's an error */
184 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glReadPixels(PBO is mapped)");
189 ctx
->Driver
.ReadPixels(ctx
, x
, y
, width
, height
,
190 format
, type
, &ctx
->Pack
, pixels
);