src/mesa/drivers/dri/i965/intel_buffers.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2003 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 #include "brw_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 bool
  39 brw_is_front_buffer_reading(struct gl_framebuffer *fb)
  40 {
  41    if (!fb || _mesa_is_user_fbo(fb))
  42       return false;
  43
  44    return fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT;
  45 }
  46
  47 bool
  48 brw_is_front_buffer_drawing(struct gl_framebuffer *fb)
  49 {
  50    if (!fb || _mesa_is_user_fbo(fb))
  51       return false;
  52
  53    return (fb->_NumColorDrawBuffers >= 1 &&
  54            fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT);
  55 }
  56
  57 static void
  58 intelDrawBuffer(struct gl_context * ctx, GLenum mode)
  59 {
  60    if (brw_is_front_buffer_drawing(ctx->DrawBuffer)) {
  61       struct brw_context *const brw = brw_context(ctx);
  62
  63       /* If we might be front-buffer rendering on this buffer for the first
  64        * time, invalidate our DRI drawable so we'll ask for new buffers
  65        * (including the fake front) before we start rendering again.
  66        */
  67       dri2InvalidateDrawable(brw->driContext->driDrawablePriv);
  68       intel_prepare_render(brw);
  69    }
  70 }
  71
  72
  73 static void
  74 intelReadBuffer(struct gl_context * ctx, GLenum mode)
  75 {
  76    if (brw_is_front_buffer_reading(ctx->ReadBuffer)) {
  77       struct brw_context *const brw = brw_context(ctx);
  78
  79       /* If we might be front-buffer reading on this buffer for the first
  80        * time, invalidate our DRI drawable so we'll ask for new buffers
  81        * (including the fake front) before we start reading again.
  82        */
  83       dri2InvalidateDrawable(brw->driContext->driReadablePriv);
  84       intel_prepare_render(brw);
  85    }
  86 }
  87
  88
  89 void
  90 intelInitBufferFuncs(struct dd_function_table *functions)
  91 {
  92    functions->DrawBuffer = intelDrawBuffer;
  93    functions->ReadBuffer = intelReadBuffer;
  94 }