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_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. */ 51static INLINE GLboolean 52is_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 */ 64static void 65display_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 79void 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 */ 93void 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 */ 111static 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 */ 131static 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 143void 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