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  * Check if we're about to draw into the front color buffer.
  39  * If so, set the brw->front_buffer_dirty field to true.
  40  */
  41 void
  42 intel_check_front_buffer_rendering(struct brw_context *brw)
  43 {
  44    struct gl_context *ctx = &brw->ctx;
  45    const struct gl_framebuffer *fb = ctx->DrawBuffer;
  46    if (_mesa_is_winsys_fbo(fb)) {
  47       /* drawing to window system buffer */
  48       if (fb->_NumColorDrawBuffers > 0) {
  49          if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
  50             brw->front_buffer_dirty = true;
  51          }
  52       }
  53    }
  54 }
  55
  56 bool
  57 brw_is_front_buffer_reading(struct gl_framebuffer *fb)
  58 {
  59    if (!fb || _mesa_is_user_fbo(fb))
  60       return false;
  61
  62    return fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT;
  63 }
  64
  65 bool
  66 brw_is_front_buffer_drawing(struct gl_framebuffer *fb)
  67 {
  68    if (!fb || _mesa_is_user_fbo(fb))
  69       return false;
  70
  71    return (fb->_NumColorDrawBuffers >= 1 &&
  72            fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT);
  73 }
  74
  75 static void
  76 intelDrawBuffer(struct gl_context * ctx, GLenum mode)
  77 {
  78    if (brw_is_front_buffer_drawing(ctx->DrawBuffer)) {
  79       struct brw_context *const brw = brw_context(ctx);
  80
  81       /* If we might be front-buffer rendering on this buffer for the first
  82        * time, invalidate our DRI drawable so we'll ask for new buffers
  83        * (including the fake front) before we start rendering again.
  84        */
  85       dri2InvalidateDrawable(brw->driContext->driDrawablePriv);
  86    }
  87 }
  88
  89
  90 static void
  91 intelReadBuffer(struct gl_context * ctx, GLenum mode)
  92 {
  93    if (brw_is_front_buffer_reading(ctx->ReadBuffer)) {
  94       struct brw_context *const brw = brw_context(ctx);
  95
  96       /* If we might be front-buffer reading on this buffer for the first
  97        * time, invalidate our DRI drawable so we'll ask for new buffers
  98        * (including the fake front) before we start reading again.
  99        */
 100       dri2InvalidateDrawable(brw->driContext->driReadablePriv);
 101    }
 102 }
 103
 104
 105 void
 106 intelInitBufferFuncs(struct dd_function_table *functions)
 107 {
 108    functions->DrawBuffer = intelDrawBuffer;
 109    functions->ReadBuffer = intelReadBuffer;
 110 }