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