1 /**************************************************************************
3 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 **************************************************************************/
28 #include "main/glheader.h"
29 #include "main/enums.h"
30 #include "main/mtypes.h"
31 #include "main/macros.h"
32 #include "main/fbobject.h"
33 #include "main/image.h"
34 #include "main/bufferobj.h"
35 #include "main/readpix.h"
36 #include "main/state.h"
38 #include "brw_context.h"
39 #include "intel_screen.h"
40 #include "intel_blit.h"
41 #include "intel_buffers.h"
42 #include "intel_fbo.h"
43 #include "intel_mipmap_tree.h"
44 #include "intel_regions.h"
45 #include "intel_pixel.h"
46 #include "intel_buffer_objects.h"
48 #define FILE_DEBUG_FLAG DEBUG_PIXEL
50 /* For many applications, the new ability to pull the source buffers
51 * back out of the GTT and then do the packing/conversion operations
52 * in software will be as much of an improvement as trying to get the
53 * blitter and/or texture engine to do the work.
55 * This step is gated on private backbuffers.
57 * Obviously the frontbuffer can't be pulled back, so that is either
58 * an argument for blit/texture readpixels, or for blitting to a
59 * temporary and then pulling that back.
61 * When the destination is a pbo, however, it's not clear if it is
62 * ever going to be pulled to main memory (though the access param
63 * will be a good hint). So it sounds like we do want to be able to
64 * choose between blit/texture implementation on the gpu and pullback
65 * and cpu-based copying.
67 * Unless you can magically turn client memory into a PBO for the
68 * duration of this call, there will be a cpu-based copying step in
73 do_blit_readpixels(struct gl_context
* ctx
,
74 GLint x
, GLint y
, GLsizei width
, GLsizei height
,
75 GLenum format
, GLenum type
,
76 const struct gl_pixelstore_attrib
*pack
, GLvoid
* pixels
)
78 struct intel_context
*intel
= intel_context(ctx
);
79 struct intel_buffer_object
*dst
= intel_buffer_object(pack
->BufferObj
);
81 drm_intel_bo
*dst_buffer
;
86 DBG("%s\n", __FUNCTION__
);
88 assert(_mesa_is_bufferobj(pack
->BufferObj
));
90 struct gl_renderbuffer
*rb
= ctx
->ReadBuffer
->_ColorReadBuffer
;
91 struct intel_renderbuffer
*irb
= intel_renderbuffer(rb
);
93 if (ctx
->_ImageTransferState
||
94 !_mesa_format_matches_format_and_type(irb
->mt
->format
, format
, type
,
96 DBG("%s - bad format for blit\n", __FUNCTION__
);
100 if (pack
->SwapBytes
|| pack
->LsbFirst
) {
101 DBG("%s: bad packing params\n", __FUNCTION__
);
105 int dst_stride
= _mesa_image_row_stride(pack
, width
, format
, type
);
106 bool dst_flip
= false;
107 /* Mesa flips the dst_stride for pack->Invert, but we want our mt to have a
111 dst_stride
= -dst_stride
;
115 dst_offset
= (GLintptr
)pixels
;
116 dst_offset
+= _mesa_image_offset(2, pack
, width
, height
,
117 format
, type
, 0, 0, 0);
119 if (!_mesa_clip_copytexsubimage(ctx
,
126 dirty
= intel
->front_buffer_dirty
;
127 intel_prepare_render(intel
);
128 intel
->front_buffer_dirty
= dirty
;
130 all
= (width
* height
* irb
->mt
->cpp
== dst
->Base
.Size
&&
131 x
== 0 && dst_offset
== 0);
133 dst_buffer
= intel_bufferobj_buffer(intel
, dst
,
134 all
? INTEL_WRITE_FULL
:
137 struct intel_mipmap_tree
*pbo_mt
=
138 intel_miptree_create_for_bo(intel
,
143 dst_stride
, I915_TILING_NONE
);
145 if (!intel_miptree_blit(intel
,
146 irb
->mt
, irb
->mt_level
, irb
->mt_layer
,
147 x
, y
, _mesa_is_winsys_fbo(ctx
->ReadBuffer
),
150 width
, height
, GL_COPY
)) {
154 intel_miptree_release(&pbo_mt
);
156 DBG("%s - DONE\n", __FUNCTION__
);
162 intelReadPixels(struct gl_context
* ctx
,
163 GLint x
, GLint y
, GLsizei width
, GLsizei height
,
164 GLenum format
, GLenum type
,
165 const struct gl_pixelstore_attrib
*pack
, GLvoid
* pixels
)
167 struct intel_context
*intel
= intel_context(ctx
);
170 DBG("%s\n", __FUNCTION__
);
172 if (_mesa_is_bufferobj(pack
->BufferObj
)) {
173 /* Using PBOs, so try the BLT based path. */
174 if (do_blit_readpixels(ctx
, x
, y
, width
, height
, format
, type
, pack
,
179 perf_debug("%s: fallback to CPU mapping in PBO case\n", __FUNCTION__
);
182 /* glReadPixels() wont dirty the front buffer, so reset the dirty
183 * flag after calling intel_prepare_render(). */
184 dirty
= intel
->front_buffer_dirty
;
185 intel_prepare_render(intel
);
186 intel
->front_buffer_dirty
= dirty
;
188 /* Update Mesa state before calling _mesa_readpixels().
189 * XXX this may not be needed since ReadPixels no longer uses the
194 _mesa_update_state(ctx
);
196 _mesa_readpixels(ctx
, x
, y
, width
, height
, format
, type
, pack
, pixels
);
198 /* There's an intel_prepare_render() call in intelSpanRenderStart(). */
199 intel
->front_buffer_dirty
= dirty
;