xref: /external/mesa3d/src/mesa/state_tracker/st_atom_framebuffer.c

/**************************************************************************
 *
 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/

 /*
  * Authors:
  *   Keith Whitwell <keith@tungstengraphics.com>
  *   Brian Paul
  */

#include "st_context.h"
#include "st_atom.h"
#include "st_cb_fbo.h"
#include "pipe/p_context.h"
#include "cso_cache/cso_context.h"


/**
 * Update framebuffer state (color, depth, stencil, etc. buffers)
 * XXX someday: separate draw/read buffers.
 */
static void
update_framebuffer_state( struct st_context *st )
{
   struct pipe_framebuffer_state *framebuffer = &st->state.framebuffer;
   struct gl_framebuffer *fb = st->ctx->DrawBuffer;
   struct st_renderbuffer *strb;
   GLuint i, j;

   memset(framebuffer, 0, sizeof(*framebuffer));

   framebuffer->width = fb->Width;
   framebuffer->height = fb->Height;

   /* Examine Mesa's ctx->DrawBuffer->_ColorDrawBuffers state
    * to determine which surfaces to draw to
    */
   framebuffer->num_cbufs = 0;
   for (j = 0; j < MAX_DRAW_BUFFERS; j++) {
      for (i = 0; i < fb->_NumColorDrawBuffers[j]; i++) {
         strb = st_renderbuffer(fb->_ColorDrawBuffers[j][i]);
         assert(strb->surface);
         framebuffer->cbufs[framebuffer->num_cbufs] = strb->surface;
         framebuffer->num_cbufs++;
      }
   }

   strb = st_renderbuffer(fb->Attachment[BUFFER_DEPTH].Renderbuffer);
   if (strb) {
      strb = st_renderbuffer(strb->Base.Wrapped);
      assert(strb->surface);
      framebuffer->zsbuf = strb->surface;
   }
   else {
      strb = st_renderbuffer(fb->Attachment[BUFFER_STENCIL].Renderbuffer);
      if (strb) {
         strb = st_renderbuffer(strb->Base.Wrapped);
         assert(strb->surface);
         framebuffer->zsbuf = strb->surface;
      }
   }

   cso_set_framebuffer(st->cso_context, framebuffer);

   if (fb->_ColorDrawBufferMask[0] & BUFFER_BIT_FRONT_LEFT) {
      if (st->frontbuffer_status == FRONT_STATUS_COPY_OF_BACK) {
         /* XXX copy back buf to front? */
      }
      /* we're assuming we'll really draw to the front buffer */
      st->frontbuffer_status = FRONT_STATUS_DIRTY;
   }
}


const struct st_tracked_state st_update_framebuffer = {
   "st_update_framebuffer",				/* name */
   {							/* dirty */
      _NEW_BUFFERS,					/* mesa */
      0,						/* st */
   },
   update_framebuffer_state				/* update */
};