src/mesa/state_tracker/st_cb_flush.c

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