src/mesa/state_tracker/st_cb_viewport.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 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
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   9  * without limitation the rights to use, copy, modify, merge, publish,
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  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
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  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28 #include "main/glheader.h"
  29 #include "st_context.h"
  30 #include "st_cb_viewport.h"
  31
  32 #include "pipe/p_state.h"
  33 #include "pipe/p_defines.h"
  34 #include "util/u_atomic.h"
  35
  36 /**
  37  * Cast wrapper to convert a struct gl_framebuffer to an st_framebuffer.
  38  * Return NULL if the struct gl_framebuffer is a user-created framebuffer.
  39  * We'll only return non-null for window system framebuffers.
  40  * Note that this function may fail.
  41  */
  42 static INLINE struct st_framebuffer *
  43 st_ws_framebuffer(struct gl_framebuffer *fb)
  44 {
  45    /* FBO cannot be casted.  See st_new_framebuffer */
  46    if (fb && _mesa_is_winsys_fbo(fb))
  47       return (struct st_framebuffer *) fb;
  48    return NULL;
  49 }
  50
  51 static void st_viewport(struct gl_context *ctx)
  52 {
  53    struct st_context *st = ctx->st;
  54    struct st_framebuffer *stdraw;
  55    struct st_framebuffer *stread;
  56
  57    if (!st->invalidate_on_gl_viewport)
  58       return;
  59
  60    /*
  61     * Normally we'd want the state tracker manager to mark the drawables
  62     * invalid only when needed. This will force the state tracker manager
  63     * to revalidate the drawable, rather than just update the context with
  64     * the latest cached drawable info.
  65     */
  66
  67    stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
  68    stread = st_ws_framebuffer(st->ctx->ReadBuffer);
  69
  70    if (stdraw && stdraw->iface)
  71       stdraw->iface_stamp = p_atomic_read(&stdraw->iface->stamp) - 1;
  72    if (stread && stread != stdraw && stread->iface)
  73       stread->iface_stamp = p_atomic_read(&stread->iface->stamp) - 1;
  74 }
  75
  76 void st_init_viewport_functions(struct dd_function_table *functions)
  77 {
  78    functions->Viewport = st_viewport;
  79 }