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
   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 "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    return (struct st_framebuffer *) ((fb && !fb->Name) ? fb : NULL);
  47 }
  48
  49 static void st_viewport(struct gl_context * ctx, GLint x, GLint y,
  50                         GLsizei width, GLsizei height)
  51 {
  52    struct st_context *st = ctx->st;
  53    struct st_framebuffer *stdraw;
  54    struct st_framebuffer *stread;
  55
  56    if (!st->invalidate_on_gl_viewport)
  57       return;
  58
  59    stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
  60    stread = st_ws_framebuffer(st->ctx->ReadBuffer);
  61
  62    if (stdraw)
  63       p_atomic_set(&stdraw->revalidate, TRUE);
  64    if (stread && stread != stdraw)
  65       p_atomic_set(&stread->revalidate, TRUE);
  66 }
  67
  68 void st_init_viewport_functions(struct dd_function_table *functions)
  69 {
  70    functions->Viewport = st_viewport;
  71 }