reactos/dll/opengl/mesa/src/mesa/state_tracker/st_cb_flush.c

   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
  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
  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
  79 void st_flush( struct st_context *st,
  80                struct pipe_fence_handle **fence )
  81 {
  82    FLUSH_CURRENT(st->ctx, 0);
  83
  84    /* Release any vertex buffers that might potentially be accessed in
  85     * successive frames:
  86     */
  87    st_flush_bitmap(st);
  88    st_flush_clear(st);
  89    util_blit_flush(st->blit);
  90    util_gen_mipmap_flush(st->gen_mipmap);
  91
  92    st->pipe->flush( st->pipe, fence );
  93 }
  94
  95
  96 /**
  97  * Flush, and wait for completion.
  98  */
  99 void st_finish( struct st_context *st )
 100 {
 101    struct pipe_fence_handle *fence = NULL;
 102
 103    st_flush(st, &fence);
 104
 105    if(fence) {
 106       st->pipe->screen->fence_finish(st->pipe->screen, fence,
 107                                      PIPE_TIMEOUT_INFINITE);
 108       st->pipe->screen->fence_reference(st->pipe->screen, &fence, NULL);
 109    }
 110 }
 111
 112
 113
 114 /**
 115  * Called via ctx->Driver.Flush()
 116  */
 117 static void st_glFlush(struct gl_context *ctx)
 118 {
 119    struct st_context *st = st_context(ctx);
 120
 121    /* Don't call st_finish() here.  It is not the state tracker's
 122     * responsibilty to inject sleeps in the hope of avoiding buffer
 123     * synchronization issues.  Calling finish() here will just hide
 124     * problems that need to be fixed elsewhere.
 125     */
 126    st_flush(st, NULL);
 127
 128    if (is_front_buffer_dirty(st)) {
 129       display_front_buffer(st);
 130    }
 131 }
 132
 133
 134 /**
 135  * Called via ctx->Driver.Finish()
 136  */
 137 static void st_glFinish(struct gl_context *ctx)
 138 {
 139    struct st_context *st = st_context(ctx);
 140
 141    st_finish(st);
 142
 143    if (is_front_buffer_dirty(st)) {
 144       display_front_buffer(st);
 145    }
 146 }
 147
 148
 149 void st_init_flush_functions(struct dd_function_table *functions)
 150 {
 151    functions->Flush = st_glFlush;
 152    functions->Finish = st_glFinish;
 153
 154    /* Windows opengl32.dll calls glFinish prior to every swapbuffers.
 155     * This is unnecessary and degrades performance.  Luckily we have some
 156     * scope to work around this, as the externally-visible behaviour of
 157     * Finish() is identical to Flush() in all cases - no differences in
 158     * rendering or ReadPixels are visible if we opt not to wait here.
 159     *
 160     * Only set this up on windows to avoid suprise elsewhere.
 161     */
 162 #ifdef PIPE_OS_WINDOWS
 163    functions->Finish = st_glFlush;
 164 #endif
 165 }