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  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
  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 "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. }
  80.