src/mesa/drivers/dri/intel/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 "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  * Return pointer to current color reading region, or NULL.
  39  */
  40 struct intel_region *
  41 intel_readbuf_region(struct intel_context *intel)
  42 {
  43    struct intel_renderbuffer *irb
  44       = intel_renderbuffer(intel->ctx.ReadBuffer->_ColorReadBuffer);
  45    if (irb && irb->mt)
  46       return irb->mt->region;
  47    else
  48       return NULL;
  49 }
  50
  51 /**
  52  * Check if we're about to draw into the front color buffer.
  53  * If so, set the intel->front_buffer_dirty field to true.
  54  */
  55 void
  56 intel_check_front_buffer_rendering(struct intel_context *intel)
  57 {
  58    const struct gl_framebuffer *fb = intel->ctx.DrawBuffer;
  59    if (_mesa_is_winsys_fbo(fb)) {
  60       /* drawing to window system buffer */
  61       if (fb->_NumColorDrawBuffers > 0) {
  62          if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
  63             intel->front_buffer_dirty = true;
  64          }
  65       }
  66    }
  67 }
  68
  69 static void
  70 intelDrawBuffer(struct gl_context * ctx, GLenum mode)
  71 {
  72    if (ctx->DrawBuffer && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
  73       struct intel_context *const intel = intel_context(ctx);
  74       const bool was_front_buffer_rendering =
  75         intel->is_front_buffer_rendering;
  76
  77       intel->is_front_buffer_rendering = (mode == GL_FRONT_LEFT)
  78         || (mode == GL_FRONT) || (mode == GL_FRONT_AND_BACK);
  79
  80       /* If we weren't front-buffer rendering before but we are now,
  81        * invalidate our DRI drawable so we'll ask for new buffers
  82        * (including the fake front) before we start rendering again.
  83        */
  84       if (!was_front_buffer_rendering && intel->is_front_buffer_rendering)
  85          dri2InvalidateDrawable(intel->driContext->driDrawablePriv);
  86    }
  87
  88    intel_draw_buffer(ctx);
  89 }
  90
  91
  92 static void
  93 intelReadBuffer(struct gl_context * ctx, GLenum mode)
  94 {
  95    if (ctx->DrawBuffer && _mesa_is_winsys_fbo(ctx->DrawBuffer)) {
  96       struct intel_context *const intel = intel_context(ctx);
  97       const bool was_front_buffer_reading =
  98         intel->is_front_buffer_reading;
  99
 100       intel->is_front_buffer_reading = (mode == GL_FRONT_LEFT)
 101         || (mode == GL_FRONT);
 102
 103       /* If we weren't front-buffer reading before but we are now,
 104        * invalidate our DRI drawable so we'll ask for new buffers
 105        * (including the fake front) before we start reading again.
 106        */
 107       if (!was_front_buffer_reading && intel->is_front_buffer_reading)
 108          dri2InvalidateDrawable(intel->driContext->driReadablePriv);
 109    }
 110 }
 111
 112
 113 void
 114 intelInitBufferFuncs(struct dd_function_table *functions)
 115 {
 116    functions->DrawBuffer = intelDrawBuffer;
 117    functions->ReadBuffer = intelReadBuffer;
 118 }