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(struct gl_context
*ctx
, GLenum format
, GLenum type
,
46 const char *readDraw
= drawing
? "Draw" : "Read";
47 const GLboolean reading
= !drawing
;
49 /* state validation should have already been done */
50 ASSERT(ctx
->NewState
== 0x0);
52 if (ctx
->Extensions
.EXT_packed_depth_stencil
53 && type
== GL_UNSIGNED_INT_24_8_EXT
54 && format
!= GL_DEPTH_STENCIL_EXT
) {
55 _mesa_error(ctx
, GL_INVALID_OPERATION
,
56 "gl%sPixels(format is not GL_DEPTH_STENCIL_EXT)", readDraw
);
60 /* basic combinations test */
61 if (!_mesa_is_legal_format_and_type(ctx
, format
, type
)) {
62 _mesa_error(ctx
, GL_INVALID_ENUM
,
63 "gl%sPixels(format or type)", readDraw
);
67 /* additional checks */
75 case GL_LUMINANCE_ALPHA
:
81 case GL_RED_INTEGER_EXT
:
82 case GL_GREEN_INTEGER_EXT
:
83 case GL_BLUE_INTEGER_EXT
:
84 case GL_ALPHA_INTEGER_EXT
:
85 case GL_RGB_INTEGER_EXT
:
86 case GL_RGBA_INTEGER_EXT
:
87 case GL_BGR_INTEGER_EXT
:
88 case GL_BGRA_INTEGER_EXT
:
89 case GL_LUMINANCE_INTEGER_EXT
:
90 case GL_LUMINANCE_ALPHA_INTEGER_EXT
:
93 if (!_mesa_source_buffer_exists(ctx
, GL_COLOR
)) {
94 _mesa_error(ctx
, GL_INVALID_OPERATION
,
95 "glReadPixels(no color buffer)");
102 if (ctx
->PixelMaps
.ItoR
.Size
== 0 ||
103 ctx
->PixelMaps
.ItoG
.Size
== 0 ||
104 ctx
->PixelMaps
.ItoB
.Size
== 0) {
105 _mesa_error(ctx
, GL_INVALID_OPERATION
,
106 "glDrawPixels(drawing color index pixels into RGB buffer)");
112 if (!_mesa_source_buffer_exists(ctx
, GL_COLOR
)) {
113 _mesa_error(ctx
, GL_INVALID_OPERATION
,
114 "glReadPixels(no color buffer)");
117 /* We no longer support CI-mode color buffers so trying to read
118 * GL_COLOR_INDEX pixels is always an error.
120 _mesa_error(ctx
, GL_INVALID_OPERATION
,
121 "glReadPixels(color buffer is RGB)");
125 case GL_STENCIL_INDEX
:
126 if ((drawing
&& !_mesa_dest_buffer_exists(ctx
, format
)) ||
127 (reading
&& !_mesa_source_buffer_exists(ctx
, format
))) {
128 _mesa_error(ctx
, GL_INVALID_OPERATION
,
129 "gl%sPixels(no stencil buffer)", readDraw
);
133 case GL_DEPTH_COMPONENT
:
134 if ((drawing
&& !_mesa_dest_buffer_exists(ctx
, format
))) {
135 _mesa_error(ctx
, GL_INVALID_OPERATION
,
136 "gl%sPixels(no depth buffer)", readDraw
);
140 case GL_DEPTH_STENCIL_EXT
:
141 if (!ctx
->Extensions
.EXT_packed_depth_stencil
||
142 type
!= GL_UNSIGNED_INT_24_8_EXT
) {
143 _mesa_error(ctx
, GL_INVALID_ENUM
, "gl%sPixels(type)", readDraw
);
146 if ((drawing
&& !_mesa_dest_buffer_exists(ctx
, format
)) ||
147 (reading
&& !_mesa_source_buffer_exists(ctx
, format
))) {
148 _mesa_error(ctx
, GL_INVALID_OPERATION
,
149 "gl%sPixels(no depth or stencil buffer)", readDraw
);
154 /* this should have been caught in _mesa_is_legal_format_type() */
155 _mesa_problem(ctx
, "unexpected format in _mesa_%sPixels", readDraw
);
166 _mesa_ReadPixels( GLint x
, GLint y
, GLsizei width
, GLsizei height
,
167 GLenum format
, GLenum type
, GLvoid
*pixels
)
169 GET_CURRENT_CONTEXT(ctx
);
170 ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx
);
172 FLUSH_CURRENT(ctx
, 0);
174 if (width
< 0 || height
< 0) {
175 _mesa_error( ctx
, GL_INVALID_VALUE
,
176 "glReadPixels(width=%d height=%d)", width
, height
);
181 _mesa_update_state(ctx
);
183 if (_mesa_error_check_format_type(ctx
, format
, type
, GL_FALSE
)) {
188 if (ctx
->ReadBuffer
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
189 _mesa_error(ctx
, GL_INVALID_FRAMEBUFFER_OPERATION_EXT
,
190 "glReadPixels(incomplete framebuffer)" );
194 if (!_mesa_source_buffer_exists(ctx
, format
)) {
195 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glReadPixels(no readbuffer)");
199 if (width
== 0 || height
== 0)
200 return; /* nothing to do */
202 if (_mesa_is_bufferobj(ctx
->Pack
.BufferObj
)) {
203 if (!_mesa_validate_pbo_access(2, &ctx
->Pack
, width
, height
, 1,
204 format
, type
, pixels
)) {
205 _mesa_error(ctx
, GL_INVALID_OPERATION
,
206 "glReadPixels(invalid PBO access)");
210 if (_mesa_bufferobj_mapped(ctx
->Pack
.BufferObj
)) {
211 /* buffer is mapped - that's an error */
212 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glReadPixels(PBO is mapped)");
217 ctx
->Driver
.ReadPixels(ctx
, x
, y
, width
, height
,
218 format
, type
, &ctx
->Pack
, pixels
);