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_fbo.h"
  41 #include "st_public.h"
  42 #include "pipe/p_context.h"
  43 #include "pipe/p_defines.h"
  44 #include "pipe/p_winsys.h"
  45
  46
  47 static void
  48 flush_front_buffer(struct st_context *st, uint pipeFlushFlags,
  49                    struct pipe_fence_handle **fence)
  50 {
  51    GLframebuffer *fb = st->ctx->DrawBuffer;
  52
  53    if (!fb)
  54       return;
  55
  56    /* XXX: temporary hack.  This flag should only be set if we do any
  57     * rendering to the front buffer.
  58     *
  59     * Further more, the scissor rectangle could be tracked to
  60     * construct a dirty region of the front buffer, to avoid
  61     * situations where it must be copied repeatedly.
  62     *
  63     * In the extreme case, some kind of timer could be set up to allow
  64     * coalescing of multiple flushes to the frontbuffer, which can be
  65     * quite a performance drain if there are a sufficient number of
  66     * them.
  67     */
  68    st->flags.frontbuffer_dirty
  69       = (fb->_ColorDrawBufferMask[0] & BUFFER_BIT_FRONT_LEFT);
  70
  71    if (st->flags.frontbuffer_dirty) {
  72       struct st_renderbuffer *strb
  73          = st_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
  74       struct pipe_surface *front_surf = strb->surface;
  75
  76       /* If we aren't rendering to the frontbuffer, this is a noop.
  77        * This should be uncontroversial for glFlush, though people may
  78        * feel more strongly about glFinish.
  79        *
  80        * Additionally, need to make sure that the frontbuffer_dirty
  81        * flag really gets set on frontbuffer rendering.
  82        */
  83       st->pipe->flush( st->pipe, pipeFlushFlags, fence );
  84
  85       /* Hook for copying "fake" frontbuffer if necessary:
  86        */
  87       st->pipe->winsys->flush_frontbuffer( st->pipe->winsys, front_surf,
  88                                            st->pipe->priv );
  89       st->flags.frontbuffer_dirty = 0;
  90    }
  91 }
  92
  93
  94 void st_flush( struct st_context *st, uint pipeFlushFlags,
  95                struct pipe_fence_handle **fence )
  96 {
  97    FLUSH_VERTICES(st->ctx, 0);
  98
  99    st_flush_bitmap_cache(st);
 100
 101    st->pipe->flush( st->pipe, pipeFlushFlags, fence );
 102 }
 103
 104
 105 /**
 106  * Called via ctx->Driver.Flush()
 107  */
 108 static void st_glFlush(GLcontext *ctx)
 109 {
 110    st_flush_bitmap_cache(ctx->st);
 111
 112    FLUSH_VERTICES(ctx, 0);
 113
 114    flush_front_buffer(ctx->st, PIPE_FLUSH_RENDER_CACHE, NULL);
 115 }
 116
 117
 118 void st_finish( struct st_context *st )
 119 {
 120    struct pipe_fence_handle *fence = NULL;
 121
 122    st_flush(st, PIPE_FLUSH_RENDER_CACHE, &fence);
 123
 124    st->pipe->winsys->fence_finish(st->pipe->winsys, fence, 0);
 125    st->pipe->winsys->fence_reference(st->pipe->winsys, &fence, NULL);
 126 }
 127
 128
 129 /**
 130  * Called via ctx->Driver.Finish()
 131  */
 132 static void st_glFinish(GLcontext *ctx)
 133 {
 134    st_finish( ctx->st );
 135
 136    flush_front_buffer(ctx->st, PIPE_FLUSH_RENDER_CACHE, NULL);
 137 }
 138
 139
 140 void st_init_flush_functions(struct dd_function_table *functions)
 141 {
 142    functions->Flush = st_glFlush;
 143    functions->Finish = st_glFinish;
 144 }