src/mesa/state_tracker/st_cb_viewport.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
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   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
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  11  * permit persons to whom the Software is furnished to do so, subject to
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  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
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  26  **************************************************************************/
  27
  28 #include "main/glheader.h"
  29 #include "st_context.h"
  30 #include "st_cb_fbo.h"
  31 #include "st_cb_viewport.h"
  32
  33 #include "pipe/p_state.h"
  34 #include "pipe/p_defines.h"
  35 #include "util/u_atomic.h"
  36
  37
  38 static void st_viewport(struct gl_context *ctx)
  39 {
  40    struct st_context *st = ctx->st;
  41    struct st_framebuffer *stdraw;
  42    struct st_framebuffer *stread;
  43
  44    if (!st->invalidate_on_gl_viewport)
  45       return;
  46
  47    /*
  48     * Normally we'd want the frontend manager to mark the drawables
  49     * invalid only when needed. This will force the frontend manager
  50     * to revalidate the drawable, rather than just update the context with
  51     * the latest cached drawable info.
  52     */
  53
  54    stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
  55    stread = st_ws_framebuffer(st->ctx->ReadBuffer);
  56
  57    if (stdraw)
  58       stdraw->iface_stamp = p_atomic_read(&stdraw->iface->stamp) - 1;
  59    if (stread && stread != stdraw)
  60       stread->iface_stamp = p_atomic_read(&stread->iface->stamp) - 1;
  61 }
  62
  63 void st_init_viewport_functions(struct dd_function_table *functions)
  64 {
  65    functions->Viewport = st_viewport;
  66 }