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

   1 /*
   2  * Copyright 2003 VMware, Inc.
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the
   7  * "Software"), to deal in the Software without restriction, including
   8  * without limitation the rights to use, copy, modify, merge, publish,
   9  * distribute, sublicense, and/or sell copies of the Software, and to
  10  * permit persons to whom the Software is furnished to do so, subject to
  11  * the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the
  14  * next paragraph) shall be included in all copies or substantial portions
  15  * of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  19  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
  20  * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
  21  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  22  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  23  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #include "brw_context.h"
  27 #include "intel_buffers.h"
  28 #include "intel_fbo.h"
  29 #include "intel_mipmap_tree.h"
  30
  31 #include "main/fbobject.h"
  32 #include "main/framebuffer.h"
  33 #include "main/renderbuffer.h"
  34
  35
  36 bool
  37 brw_is_front_buffer_reading(struct gl_framebuffer *fb)
  38 {
  39    if (!fb || _mesa_is_user_fbo(fb))
  40       return false;
  41
  42    return fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT;
  43 }
  44
  45 bool
  46 brw_is_front_buffer_drawing(struct gl_framebuffer *fb)
  47 {
  48    if (!fb || _mesa_is_user_fbo(fb))
  49       return false;
  50
  51    return (fb->_NumColorDrawBuffers >= 1 &&
  52            fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT);
  53 }
  54
  55 static void
  56 intelDrawBuffer(struct gl_context * ctx, GLenum mode)
  57 {
  58    if (brw_is_front_buffer_drawing(ctx->DrawBuffer)) {
  59       struct brw_context *const brw = brw_context(ctx);
  60
  61       /* If we might be front-buffer rendering on this buffer for the first
  62        * time, invalidate our DRI drawable so we'll ask for new buffers
  63        * (including the fake front) before we start rendering again.
  64        */
  65       dri2InvalidateDrawable(brw->driContext->driDrawablePriv);
  66       intel_prepare_render(brw);
  67    }
  68 }
  69
  70
  71 static void
  72 intelReadBuffer(struct gl_context * ctx, GLenum mode)
  73 {
  74    if (brw_is_front_buffer_reading(ctx->ReadBuffer)) {
  75       struct brw_context *const brw = brw_context(ctx);
  76
  77       /* If we might be front-buffer reading on this buffer for the first
  78        * time, invalidate our DRI drawable so we'll ask for new buffers
  79        * (including the fake front) before we start reading again.
  80        */
  81       dri2InvalidateDrawable(brw->driContext->driReadablePriv);
  82       intel_prepare_render(brw);
  83    }
  84 }
  85
  86
  87 void
  88 intelInitBufferFuncs(struct dd_function_table *functions)
  89 {
  90    functions->DrawBuffer = intelDrawBuffer;
  91    functions->ReadBuffer = intelReadBuffer;
  92 }