src/mesa/state_tracker/st_atom_framebuffer.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   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  /*
  29   * Authors:
  30   *   Keith Whitwell <keith@tungstengraphics.com>
  31   *   Brian Paul
  32   */
  33
  34 #include "st_context.h"
  35 #include "st_atom.h"
  36 #include "pipe/p_context.h"
  37
  38
  39 extern struct pipe_surface *
  40 xmesa_get_color_surface(GLcontext *ctx, GLuint i);
  41
  42 extern struct pipe_surface *
  43 xmesa_get_z_surface(GLcontext *ctx, GLuint i);
  44
  45 extern struct pipe_surface *
  46 xmesa_get_stencil_surface(GLcontext *ctx, GLuint i);
  47
  48
  49 /**
  50  * Update framebuffer state (color, depth, stencil, etc. buffers)
  51  * XXX someday: separate draw/read buffers.
  52  */
  53 static void
  54 update_framebuffer_state( struct st_context *st )
  55 {
  56    struct pipe_framebuffer_state framebuffer;
  57    GLuint i;
  58
  59    /* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
  60     * to determine which surfaces to draw to
  61     */
  62    framebuffer.num_cbufs = st->ctx->DrawBuffer->_NumColorDrawBuffers[0];
  63    for (i = 0; i < framebuffer.num_cbufs; i++) {
  64       framebuffer.cbufs[i] = xmesa_get_color_surface(st->ctx, i);
  65    }
  66
  67    if (st->ctx->DrawBuffer->Attachment[BUFFER_DEPTH].Renderbuffer) {
  68       framebuffer.zbuf = xmesa_get_z_surface(st->ctx, i);
  69    }
  70
  71    if (st->ctx->DrawBuffer->Attachment[BUFFER_STENCIL].Renderbuffer) {
  72       framebuffer.sbuf = xmesa_get_stencil_surface(st->ctx, i);
  73    }
  74
  75    if (memcmp(&framebuffer, &st->state.framebuffer, sizeof(framebuffer)) != 0) {
  76       st->state.framebuffer = framebuffer;
  77       st->pipe->set_framebuffer_state( st->pipe, &framebuffer );
  78    }
  79 }
  80
  81
  82 const struct st_tracked_state st_update_framebuffer = {
  83    .dirty = {
  84       .mesa = _NEW_BUFFERS,
  85       .st  = 0,
  86    },
  87    .update = update_framebuffer_state
  88 };
  89