1 /**************************************************************************
2 *
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
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:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
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.
25 *
26 **************************************************************************/
27
28 /*
29 * Authors:
30 * Keith Whitwell <keith@tungstengraphics.com>
31 * Brian Paul
32 */
33
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"
48
49
50 /** Check if we have a front color buffer and if it's been drawn to. */
51 static INLINE GLboolean
is_front_buffer_dirty(struct st_context * st)52 is_front_buffer_dirty(struct st_context *st)
53 {
54 struct gl_framebuffer *fb = st->ctx->DrawBuffer;
55 struct st_renderbuffer *strb
56 = st_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
57 return strb && strb->defined;
58 }
59
60
61 /**
62 * Tell the screen to display the front color buffer on-screen.
63 */
64 static void
display_front_buffer(struct st_context * st)65 display_front_buffer(struct st_context *st)
66 {
67 struct gl_framebuffer *fb = st->ctx->DrawBuffer;
68 struct st_renderbuffer *strb
69 = st_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
70
71 if (strb) {
72 /* Hook for copying "fake" frontbuffer if necessary:
73 */
74 st_manager_flush_frontbuffer(st);
75 }
76 }
77
78
st_flush(struct st_context * st,struct pipe_fence_handle ** fence)79 void st_flush( struct st_context *st,
80 struct pipe_fence_handle **fence )
81 {
82 FLUSH_CURRENT(st->ctx, 0);
83
84 st_flush_bitmap_cache(st);
85
86 st->pipe->flush( st->pipe, fence );
87 }
88
89
90 /**
91 * Flush, and wait for completion.
92 */
st_finish(struct st_context * st)93 void st_finish( struct st_context *st )
94 {
95 struct pipe_fence_handle *fence = NULL;
96
97 st_flush(st, &fence);
98
99 if(fence) {
100 st->pipe->screen->fence_finish(st->pipe->screen, fence,
101 PIPE_TIMEOUT_INFINITE);
102 st->pipe->screen->fence_reference(st->pipe->screen, &fence, NULL);
103 }
104 }
105
106
107
108 /**
109 * Called via ctx->Driver.Flush()
110 */
st_glFlush(struct gl_context * ctx)111 static void st_glFlush(struct gl_context *ctx)
112 {
113 struct st_context *st = st_context(ctx);
114
115 /* Don't call st_finish() here. It is not the state tracker's
116 * responsibilty to inject sleeps in the hope of avoiding buffer
117 * synchronization issues. Calling finish() here will just hide
118 * problems that need to be fixed elsewhere.
119 */
120 st_flush(st, NULL);
121
122 if (is_front_buffer_dirty(st)) {
123 display_front_buffer(st);
124 }
125 }
126
127
128 /**
129 * Called via ctx->Driver.Finish()
130 */
st_glFinish(struct gl_context * ctx)131 static void st_glFinish(struct gl_context *ctx)
132 {
133 struct st_context *st = st_context(ctx);
134
135 st_finish(st);
136
137 if (is_front_buffer_dirty(st)) {
138 display_front_buffer(st);
139 }
140 }
141
142
st_init_flush_functions(struct dd_function_table * functions)143 void st_init_flush_functions(struct dd_function_table *functions)
144 {
145 functions->Flush = st_glFlush;
146 functions->Finish = st_glFinish;
147
148 /* Windows opengl32.dll calls glFinish prior to every swapbuffers.
149 * This is unnecessary and degrades performance. Luckily we have some
150 * scope to work around this, as the externally-visible behaviour of
151 * Finish() is identical to Flush() in all cases - no differences in
152 * rendering or ReadPixels are visible if we opt not to wait here.
153 *
154 * Only set this up on windows to avoid suprise elsewhere.
155 */
156 #ifdef PIPE_OS_WINDOWS
157 functions->Finish = st_glFlush;
158 #endif
159 }
160