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      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 "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  * Check if we're about to draw into the front color buffer.
     39  * If so, set the intel->front_buffer_dirty field to true.
     40  */
     41 void
     42 intel_check_front_buffer_rendering(struct intel_context *intel)
     43 {
     44    const struct gl_framebuffer *fb = intel->ctx.DrawBuffer;
     45    if (_mesa_is_winsys_fbo(fb)) {
     46       /* drawing to window system buffer */
     47       if (fb->_NumColorDrawBuffers > 0) {
     48          if (fb->_ColorDrawBufferIndexes[0] == BUFFER_FRONT_LEFT) {
     49 	    intel->front_buffer_dirty = true;
     50 	 }
     51       }
     52    }
     53 }
     54 
     55 static void
     56 intelDrawBuffer(struct gl_context * ctx, GLenum mode)
     57 {
     58    if (_mesa_is_front_buffer_drawing(ctx->DrawBuffer)) {
     59       struct intel_context *const intel = intel_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(intel->driContext->driDrawablePriv);
     66    }
     67 
     68    intel_draw_buffer(ctx);
     69 }
     70 
     71 
     72 static void
     73 intelReadBuffer(struct gl_context * ctx, GLenum mode)
     74 {
     75    if (_mesa_is_front_buffer_reading(ctx->ReadBuffer)) {
     76       struct intel_context *const intel = intel_context(ctx);
     77 
     78       /* If we might be front-buffer reading on this buffer for the first
     79        * time, invalidate our DRI drawable so we'll ask for new buffers
     80        * (including the fake front) before we start reading again.
     81        */
     82       dri2InvalidateDrawable(intel->driContext->driReadablePriv);
     83    }
     84 }
     85 
     86 
     87 void
     88 intelInitBufferFuncs(struct dd_function_table *functions)
     89 {
     90    functions->DrawBuffer = intelDrawBuffer;
     91    functions->ReadBuffer = intelReadBuffer;
     92 }
     93