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_public.h"
  43 #include "st_manager.h"
  44 #include "pipe/p_context.h"
  45 #include "pipe/p_defines.h"
  46 #include "pipe/p_screen.h"
  47 #include "util/u_gen_mipmap.h"
  48 #include "util/u_blit.h"
  49
  50
  51 /** Check if we have a front color buffer and if it's been drawn to. */
  52 static INLINE GLboolean
  53 is_front_buffer_dirty(struct st_context *st)
  54 {
  55    if (st->frontbuffer_status == FRONT_STATUS_DIRTY) {
  56       return GL_TRUE;
  57    }
  58    else {
  59       GLframebuffer *fb = st->ctx->DrawBuffer;
  60       struct st_renderbuffer *strb
  61          = st_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
  62       return strb && strb->defined;
  63    }
  64 }
  65
  66
  67 /**
  68  * Tell the screen to display the front color buffer on-screen.
  69  */
  70 static void
  71 display_front_buffer(struct st_context *st)
  72 {
  73    GLframebuffer *fb = st->ctx->DrawBuffer;
  74    struct st_renderbuffer *strb
  75       = st_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
  76
  77    if (strb) {
  78       /* Hook for copying "fake" frontbuffer if necessary:
  79        */
  80       st_manager_flush_frontbuffer(st);
  81
  82       /*
  83         st->frontbuffer_status = FRONT_STATUS_UNDEFINED;
  84       */
  85    }
  86 }
  87
  88
  89 void st_flush( struct st_context *st, uint pipeFlushFlags,
  90                struct pipe_fence_handle **fence )
  91 {
  92    FLUSH_CURRENT(st->ctx, 0);
  93
  94    /* Release any vertex buffers that might potentially be accessed in
  95     * successive frames:
  96     */
  97    st_flush_bitmap(st);
  98    st_flush_clear(st);
  99    util_blit_flush(st->blit);
 100    util_gen_mipmap_flush(st->gen_mipmap);
 101
 102    st->pipe->flush( st->pipe, pipeFlushFlags, fence );
 103 }
 104
 105
 106 /**
 107  * Flush, and wait for completion.
 108  */
 109 void st_finish( struct st_context *st )
 110 {
 111    struct pipe_fence_handle *fence = NULL;
 112
 113    st_flush(st, PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME, &fence);
 114
 115    if(fence) {
 116       st->pipe->screen->fence_finish(st->pipe->screen, fence, 0);
 117       st->pipe->screen->fence_reference(st->pipe->screen, &fence, NULL);
 118    }
 119 }
 120
 121
 122
 123 /**
 124  * Called via ctx->Driver.Flush()
 125  */
 126 static void st_glFlush(GLcontext *ctx)
 127 {
 128    struct st_context *st = ctx->st;
 129
 130    /* Don't call st_finish() here.  It is not the state tracker's
 131     * responsibilty to inject sleeps in the hope of avoiding buffer
 132     * synchronization issues.  Calling finish() here will just hide
 133     * problems that need to be fixed elsewhere.
 134     */
 135    st_flush(st, PIPE_FLUSH_RENDER_CACHE | PIPE_FLUSH_FRAME, NULL);
 136
 137    if (is_front_buffer_dirty(st)) {
 138       display_front_buffer(st);
 139    }
 140 }
 141
 142
 143 /**
 144  * Called via ctx->Driver.Finish()
 145  */
 146 static void st_glFinish(GLcontext *ctx)
 147 {
 148    struct st_context *st = ctx->st;
 149
 150    st_finish(st);
 151
 152    if (is_front_buffer_dirty(st)) {
 153       display_front_buffer(st);
 154    }
 155 }
 156
 157
 158 void st_init_flush_functions(struct dd_function_table *functions)
 159 {
 160    functions->Flush = st_glFlush;
 161    functions->Finish = st_glFinish;
 162
 163    /* Windows opengl32.dll calls glFinish prior to every swapbuffers.
 164     * This is unnecessary and degrades performance.  Luckily we have some
 165     * scope to work around this, as the externally-visible behaviour of
 166     * Finish() is identical to Flush() in all cases - no differences in
 167     * rendering or ReadPixels are visible if we opt not to wait here.
 168     *
 169     * Only set this up on windows to avoid suprise elsewhere.
 170     */
 171 #ifdef PIPE_OS_WINDOWS
 172    functions->Finish = st_glFlush;
 173 #endif
 174 }