src/mesa/state_tracker/st_cb_msaa.c

   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
  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 static void
  60 st_GetProgrammableSampleCaps(struct gl_context *ctx, const struct gl_framebuffer *fb,
  61                              GLuint *outBits, GLuint *outWidth, GLuint *outHeight)
  62 {
  63    struct st_context *st = st_context(ctx);
  64    struct pipe_screen *screen = st->pipe->screen;
  65
  66    st_validate_state(st, ST_PIPELINE_UPDATE_FRAMEBUFFER);
  67
  68    *outBits = 4;
  69    *outWidth = 1;
  70    *outHeight = 1;
  71
  72    if (ctx->Extensions.ARB_sample_locations)
  73       screen->get_sample_pixel_grid(screen, st->state.fb_num_samples,
  74                                     outWidth, outHeight);
  75
  76    /* We could handle this better in some circumstances,
  77     * but it's not really an issue */
  78    if (*outWidth > MAX_SAMPLE_LOCATION_GRID_SIZE ||
  79        *outHeight > MAX_SAMPLE_LOCATION_GRID_SIZE) {
  80       *outWidth = 1;
  81       *outHeight = 1;
  82    }
  83 }
  84
  85 void
  86 st_init_msaa_functions(struct dd_function_table *functions)
  87 {
  88    functions->GetSamplePosition = st_GetSamplePosition;
  89    functions->GetProgrammableSampleCaps = st_GetProgrammableSampleCaps;
  90 }