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  1. /**************************************************************************
  2.  *
  3.  * Copyright 2003 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. #include "intel_context.h"
  29. #include "intel_buffers.h"
  30. #include "intel_fbo.h"
  31. #include "intel_mipmap_tree.h"
  32.  
  33. #include "main/fbobject.h"
  34. #include "main/framebuffer.h"
  35. #include "main/renderbuffer.h"
  36.  
  37. /**
  38.  * Check if we're about to draw into the front color buffer.
  39.  * If so, set the intel->front_buffer_dirty field to true.
  40.  */
  41. void
  42. intel_check_front_buffer_rendering(struct intel_context *intel)
  43. {
  44.    const struct gl_framebuffer *fb = intel->ctx.DrawBuffer;
  45.    if (_mesa_is_winsys_fbo(fb)) {
  46.       /* drawing to window system buffer */
  47.       if (fb->_NumColorDrawBuffers > 0) {
  48.          if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
  49.             intel->front_buffer_dirty = true;
  50.          }
  51.       }
  52.    }
  53. }
  54.  
  55. static void
  56. intelDrawBuffer(struct gl_context * ctx, GLenum mode)
  57. {
  58.    if (ctx->DrawBuffer && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
  59.       struct intel_context *const intel = intel_context(ctx);
  60.       const bool was_front_buffer_rendering =
  61.         intel->is_front_buffer_rendering;
  62.  
  63.       intel->is_front_buffer_rendering = (mode == GL_FRONT_LEFT)
  64.         || (mode == GL_FRONT) || (mode == GL_FRONT_AND_BACK);
  65.  
  66.       /* If we weren't front-buffer rendering before but we are now,
  67.        * invalidate our DRI drawable so we'll ask for new buffers
  68.        * (including the fake front) before we start rendering again.
  69.        */
  70.       if (!was_front_buffer_rendering && intel->is_front_buffer_rendering)
  71.          dri2InvalidateDrawable(intel->driContext->driDrawablePriv);
  72.    }
  73.  
  74.    intel_draw_buffer(ctx);
  75. }
  76.  
  77.  
  78. static void
  79. intelReadBuffer(struct gl_context * ctx, GLenum mode)
  80. {
  81.    if (ctx->DrawBuffer && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
  82.       struct intel_context *const intel = intel_context(ctx);
  83.       const bool was_front_buffer_reading =
  84.         intel->is_front_buffer_reading;
  85.  
  86.       intel->is_front_buffer_reading = (mode == GL_FRONT_LEFT)
  87.         || (mode == GL_FRONT);
  88.  
  89.       /* If we weren't front-buffer reading before but we are now,
  90.        * invalidate our DRI drawable so we'll ask for new buffers
  91.        * (including the fake front) before we start reading again.
  92.        */
  93.       if (!was_front_buffer_reading && intel->is_front_buffer_reading)
  94.          dri2InvalidateDrawable(intel->driContext->driReadablePriv);
  95.    }
  96. }
  97.  
  98.  
  99. void
  100. intelInitBufferFuncs(struct dd_function_table *functions)
  101. {
  102.    functions->DrawBuffer = intelDrawBuffer;
  103.    functions->ReadBuffer = intelReadBuffer;
  104. }
  105.