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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 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    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, GLint x, GLint y,
     52                         GLsizei width, GLsizei height)
     53 {
     54    struct st_context *st = ctx->st;
     55    struct st_framebuffer *stdraw;
     56    struct st_framebuffer *stread;
     57 
     58    if (!st->invalidate_on_gl_viewport)
     59       return;
     60 
     61    /*
     62     * Normally we'd want the state tracker manager to mark the drawables
     63     * invalid only when needed. This will force the state tracker manager
     64     * to revalidate the drawable, rather than just update the context with
     65     * the latest cached drawable info.
     66     */
     67 
     68    stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
     69    stread = st_ws_framebuffer(st->ctx->ReadBuffer);
     70 
     71    if (stdraw && stdraw->iface)
     72       stdraw->iface_stamp = p_atomic_read(&stdraw->iface->stamp) - 1;
     73    if (stread && stread != stdraw && stread->iface)
     74       stread->iface_stamp = p_atomic_read(&stread->iface->stamp) - 1;
     75 }
     76 
     77 void st_init_viewport_functions(struct dd_function_table *functions)
     78 {
     79    functions->Viewport = st_viewport;
     80 }
     81