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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2007 VMware, Inc.
  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 VMWARE 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 <keithw@vmware.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.  
  48.  
  49. /** Check if we have a front color buffer and if it's been drawn to. */
  50. static inline GLboolean
  51. is_front_buffer_dirty(struct st_context *st)
  52. {
  53.    struct gl_framebuffer *fb = st->ctx->DrawBuffer;
  54.    struct st_renderbuffer *strb
  55.       = st_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
  56.    return strb && strb->defined;
  57. }
  58.  
  59.  
  60. /**
  61.  * Tell the screen to display the front color buffer on-screen.
  62.  */
  63. static void
  64. display_front_buffer(struct st_context *st)
  65. {
  66.    struct gl_framebuffer *fb = st->ctx->DrawBuffer;
  67.    struct st_renderbuffer *strb
  68.       = st_renderbuffer(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
  69.  
  70.    if (strb) {
  71.       /* Hook for copying "fake" frontbuffer if necessary:
  72.        */
  73.       st_manager_flush_frontbuffer(st);
  74.    }
  75. }
  76.  
  77.  
  78. void st_flush(struct st_context *st,
  79.               struct pipe_fence_handle **fence,
  80.               unsigned flags)
  81. {
  82.    FLUSH_VERTICES(st->ctx, 0);
  83.    FLUSH_CURRENT(st->ctx, 0);
  84.  
  85.    st_flush_bitmap_cache(st);
  86.  
  87.    st->pipe->flush(st->pipe, fence, flags);
  88. }
  89.  
  90.  
  91. /**
  92.  * Flush, and wait for completion.
  93.  */
  94. void st_finish( struct st_context *st )
  95. {
  96.    struct pipe_fence_handle *fence = NULL;
  97.  
  98.    st_flush(st, &fence, 0);
  99.  
  100.    if(fence) {
  101.       st->pipe->screen->fence_finish(st->pipe->screen, fence,
  102.                                      PIPE_TIMEOUT_INFINITE);
  103.       st->pipe->screen->fence_reference(st->pipe->screen, &fence, NULL);
  104.    }
  105. }
  106.  
  107.  
  108.  
  109. /**
  110.  * Called via ctx->Driver.Flush()
  111.  */
  112. static void st_glFlush(struct gl_context *ctx)
  113. {
  114.    struct st_context *st = st_context(ctx);
  115.  
  116.    /* Don't call st_finish() here.  It is not the state tracker's
  117.     * responsibilty to inject sleeps in the hope of avoiding buffer
  118.     * synchronization issues.  Calling finish() here will just hide
  119.     * problems that need to be fixed elsewhere.
  120.     */
  121.    st_flush(st, NULL, 0);
  122.  
  123.    if (is_front_buffer_dirty(st)) {
  124.       display_front_buffer(st);
  125.    }
  126. }
  127.  
  128.  
  129. /**
  130.  * Called via ctx->Driver.Finish()
  131.  */
  132. static void st_glFinish(struct gl_context *ctx)
  133. {
  134.    struct st_context *st = st_context(ctx);
  135.  
  136.    st_finish(st);
  137.  
  138.    if (is_front_buffer_dirty(st)) {
  139.       display_front_buffer(st);
  140.    }
  141. }
  142.  
  143.  
  144. /**
  145.  * Query information about GPU resets observed by this context
  146.  *
  147.  * Called via \c dd_function_table::GetGraphicsResetStatus.
  148.  */
  149. static GLenum
  150. st_get_graphics_reset_status(struct gl_context *ctx)
  151. {
  152.    struct st_context *st = st_context(ctx);
  153.    enum pipe_reset_status status;
  154.  
  155.    status = st->pipe->get_device_reset_status(st->pipe);
  156.  
  157.    switch (status) {
  158.    case PIPE_NO_RESET:
  159.       return GL_NO_ERROR;
  160.    case PIPE_GUILTY_CONTEXT_RESET:
  161.       return GL_GUILTY_CONTEXT_RESET_ARB;
  162.    case PIPE_INNOCENT_CONTEXT_RESET:
  163.       return GL_INNOCENT_CONTEXT_RESET_ARB;
  164.    case PIPE_UNKNOWN_CONTEXT_RESET:
  165.       return GL_UNKNOWN_CONTEXT_RESET_ARB;
  166.    default:
  167.       assert(0);
  168.       return GL_NO_ERROR;
  169.    }
  170. }
  171.  
  172.  
  173. void st_init_flush_functions(struct pipe_screen *screen,
  174.                              struct dd_function_table *functions)
  175. {
  176.    functions->Flush = st_glFlush;
  177.    functions->Finish = st_glFinish;
  178.  
  179.    if (screen->get_param(screen, PIPE_CAP_DEVICE_RESET_STATUS_QUERY))
  180.       functions->GetGraphicsResetStatus = st_get_graphics_reset_status;
  181.  
  182.    /* Windows opengl32.dll calls glFinish prior to every swapbuffers.
  183.     * This is unnecessary and degrades performance.  Luckily we have some
  184.     * scope to work around this, as the externally-visible behaviour of
  185.     * Finish() is identical to Flush() in all cases - no differences in
  186.     * rendering or ReadPixels are visible if we opt not to wait here.
  187.     *
  188.     * Only set this up on Windows to avoid surprise elsewhere.
  189.     */
  190. #ifdef PIPE_OS_WINDOWS
  191.    functions->Finish = st_glFlush;
  192. #endif
  193. }
  194.