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      1 /**************************************************************************
      2  *
      3  * Copyright 2013 Red Hat
      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 THE AUTHORS 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/bufferobj.h"
     29 #include "main/imports.h"
     30 #include "main/framebuffer.h"
     31 
     32 #include "state_tracker/st_cb_msaa.h"
     33 #include "state_tracker/st_context.h"
     34 #include "state_tracker/st_atom.h"
     35 #include "state_tracker/st_cb_fbo.h"
     36 
     37 #include "pipe/p_context.h"
     38 
     39 
     40 static void
     41 st_GetSamplePosition(struct gl_context *ctx,
     42                      struct gl_framebuffer *fb,
     43                      GLuint index,
     44                      GLfloat *outPos)
     45 {
     46    struct st_context *st = st_context(ctx);
     47 
     48    st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
     49 
     50    if (st->pipe->get_sample_position)
     51       st->pipe->get_sample_position(st->pipe,
     52                                     _mesa_geometric_samples(fb),
     53                                     index, outPos);
     54    else
     55       outPos[0] = outPos[1] = 0.5f;
     56 }
     57 
     58 
     59 void
     60 st_init_msaa_functions(struct dd_function_table *functions)
     61 {
     62    functions->GetSamplePosition = st_GetSamplePosition;
     63 }
     64