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