1 /**************************************************************************
3 * Copyright 2007 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 **************************************************************************/
30 * Keith Whitwell <keith@tungstengraphics.com>
34 #include "main/glheader.h"
35 #include "main/macros.h"
36 #include "main/context.h"
37 #include "st_context.h"
38 #include "st_cb_bitmap.h"
39 #include "st_cb_flush.h"
40 #include "st_cb_clear.h"
41 #include "st_cb_fbo.h"
42 #include "st_manager.h"
43 #include "pipe/p_context.h"
44 #include "pipe/p_defines.h"
45 #include "pipe/p_screen.h"
46 #include "util/u_gen_mipmap.h"
47 #include "util/u_blit.h"
50 /** Check if we have a front color buffer and if it's been drawn to. */
51 static INLINE GLboolean
52 is_front_buffer_dirty(struct st_context
*st
)
54 GLframebuffer
*fb
= st
->ctx
->DrawBuffer
;
55 struct st_renderbuffer
*strb
56 = st_renderbuffer(fb
->Attachment
[BUFFER_FRONT_LEFT
].Renderbuffer
);
57 return strb
&& strb
->defined
;
62 * Tell the screen to display the front color buffer on-screen.
65 display_front_buffer(struct st_context
*st
)
67 GLframebuffer
*fb
= st
->ctx
->DrawBuffer
;
68 struct st_renderbuffer
*strb
69 = st_renderbuffer(fb
->Attachment
[BUFFER_FRONT_LEFT
].Renderbuffer
);
72 /* Hook for copying "fake" frontbuffer if necessary:
74 st_manager_flush_frontbuffer(st
);
79 void st_flush( struct st_context
*st
, uint pipeFlushFlags
,
80 struct pipe_fence_handle
**fence
)
82 FLUSH_CURRENT(st
->ctx
, 0);
84 /* Release any vertex buffers that might potentially be accessed in
89 util_blit_flush(st
->blit
);
90 util_gen_mipmap_flush(st
->gen_mipmap
);
92 st
->pipe
->flush( st
->pipe
, pipeFlushFlags
, fence
);
97 * Flush, and wait for completion.
99 void st_finish( struct st_context
*st
)
101 struct pipe_fence_handle
*fence
= NULL
;
103 st_flush(st
, PIPE_FLUSH_RENDER_CACHE
| PIPE_FLUSH_FRAME
, &fence
);
106 st
->pipe
->screen
->fence_finish(st
->pipe
->screen
, fence
, 0);
107 st
->pipe
->screen
->fence_reference(st
->pipe
->screen
, &fence
, NULL
);
114 * Called via ctx->Driver.Flush()
116 static void st_glFlush(GLcontext
*ctx
)
118 struct st_context
*st
= ctx
->st
;
120 /* Don't call st_finish() here. It is not the state tracker's
121 * responsibilty to inject sleeps in the hope of avoiding buffer
122 * synchronization issues. Calling finish() here will just hide
123 * problems that need to be fixed elsewhere.
125 st_flush(st
, PIPE_FLUSH_RENDER_CACHE
| PIPE_FLUSH_FRAME
, NULL
);
127 if (is_front_buffer_dirty(st
)) {
128 display_front_buffer(st
);
134 * Called via ctx->Driver.Finish()
136 static void st_glFinish(GLcontext
*ctx
)
138 struct st_context
*st
= ctx
->st
;
142 if (is_front_buffer_dirty(st
)) {
143 display_front_buffer(st
);
148 void st_init_flush_functions(struct dd_function_table
*functions
)
150 functions
->Flush
= st_glFlush
;
151 functions
->Finish
= st_glFinish
;
153 /* Windows opengl32.dll calls glFinish prior to every swapbuffers.
154 * This is unnecessary and degrades performance. Luckily we have some
155 * scope to work around this, as the externally-visible behaviour of
156 * Finish() is identical to Flush() in all cases - no differences in
157 * rendering or ReadPixels are visible if we opt not to wait here.
159 * Only set this up on windows to avoid suprise elsewhere.
161 #ifdef PIPE_OS_WINDOWS
162 functions
->Finish
= st_glFlush
;