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

   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 "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->intel.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 static void
  57 intelDrawBuffer(struct gl_context * ctx, GLenum mode)
  58 {
  59    if (ctx->DrawBuffer && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
  60       struct brw_context *const brw = brw_context(ctx);
  61       const bool was_front_buffer_rendering = brw->is_front_buffer_rendering;
  62
  63       brw->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 && brw->is_front_buffer_rendering)
  71          dri2InvalidateDrawable(brw->driContext->driDrawablePriv);
  72    }
  73 }
  74
  75
  76 static void
  77 intelReadBuffer(struct gl_context * ctx, GLenum mode)
  78 {
  79    if (ctx->DrawBuffer && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
  80       struct brw_context *const brw = brw_context(ctx);
  81       const bool was_front_buffer_reading = brw->is_front_buffer_reading;
  82
  83       brw->is_front_buffer_reading = mode == GL_FRONT_LEFT || mode == GL_FRONT;
  84
  85       /* If we weren't front-buffer reading before but we are now,
  86        * invalidate our DRI drawable so we'll ask for new buffers
  87        * (including the fake front) before we start reading again.
  88        */
  89       if (!was_front_buffer_reading && brw->is_front_buffer_reading)
  90          dri2InvalidateDrawable(brw->driContext->driReadablePriv);
  91    }
  92 }
  93
  94
  95 void
  96 intelInitBufferFuncs(struct dd_function_table *functions)
  97 {
  98    functions->DrawBuffer = intelDrawBuffer;
  99    functions->ReadBuffer = intelReadBuffer;
 100 }