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
40static void
41st_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
59static void
60st_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
85void
86st_init_msaa_functions(struct dd_function_table *functions)
87{
88   functions->GetSamplePosition = st_GetSamplePosition;
89   functions->GetProgrammableSampleCaps = st_GetProgrammableSampleCaps;
90}
91