1 /**************************************************************************
2 *
3 * Copyright 2010 VMware, Inc.
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
29 #include "st_context.h"
30 #include "pipe/p_screen.h"
31 #include "pipe/p_context.h"
32 #include "st_atom.h"
33 #include "st_program.h"
34 #include "st_util.h"
35
36 #include "cso_cache/cso_context.h"
37 #include "util/u_framebuffer.h"
38 #include "main/framebuffer.h"
39
40
41 /**
42 * Update the sample locations
43 */
44 static void
update_sample_locations(struct st_context * st)45 update_sample_locations(struct st_context *st)
46 {
47 struct gl_framebuffer *fb = st->ctx->DrawBuffer;
48
49 if (!st->ctx->Extensions.ARB_sample_locations)
50 return;
51
52 if (fb->ProgrammableSampleLocations) {
53 unsigned grid_width, grid_height, size, pixel, sample_index;
54 unsigned samples = st->state.fb_num_samples;
55 bool sample_location_pixel_grid = fb->SampleLocationPixelGrid;
56 uint8_t locations[
57 PIPE_MAX_SAMPLE_LOCATION_GRID_SIZE *
58 PIPE_MAX_SAMPLE_LOCATION_GRID_SIZE * 32];
59
60 st->screen->get_sample_pixel_grid(st->screen, samples,
61 &grid_width, &grid_height);
62 size = grid_width * grid_height * samples;
63
64 /**
65 * when a dimension is greater than MAX_SAMPLE_LOCATION_GRID_SIZE,
66 * st->ctx->Driver.GetSamplePixelGrid() returns 1 for both dimensions.
67 */
68 if (grid_width > MAX_SAMPLE_LOCATION_GRID_SIZE ||
69 grid_height > MAX_SAMPLE_LOCATION_GRID_SIZE)
70 sample_location_pixel_grid = false;
71
72 for (pixel = 0; pixel < grid_width * grid_height; pixel++) {
73 for (sample_index = 0; sample_index < samples; sample_index++) {
74 int table_index = sample_index;
75 float x = 0.5f, y = 0.5f;
76 uint8_t loc;
77 if (sample_location_pixel_grid)
78 table_index = pixel * samples + sample_index;
79 if (fb->SampleLocationTable) {
80 x = fb->SampleLocationTable[table_index*2];
81 y = fb->SampleLocationTable[table_index*2+1];
82 }
83 if (st->state.fb_orientation == Y_0_BOTTOM)
84 y = 1.0 - y;
85
86 loc = roundf(CLAMP(x * 16.0f, 0.0f, 15.0f));
87 loc |= (int)roundf(CLAMP(y * 16.0f, 0.0f, 15.0f)) << 4;
88 locations[pixel * samples + sample_index] = loc;
89 }
90 }
91
92 util_sample_locations_flip_y(
93 st->screen, st->state.fb_height, samples, locations);
94
95 if (!st->state.enable_sample_locations ||
96 st->state.sample_locations_samples != samples ||
97 memcmp(locations, st->state.sample_locations, size) != 0) {
98 st->pipe->set_sample_locations( st->pipe, size, locations);
99
100 st->state.sample_locations_samples = samples;
101 memcpy(st->state.sample_locations, locations, size);
102 }
103 } else if (st->state.enable_sample_locations) {
104 st->pipe->set_sample_locations(st->pipe, 0, NULL);
105 }
106
107 st->state.enable_sample_locations = fb->ProgrammableSampleLocations;
108 }
109
110
111 /* Update the sample mask and locations for MSAA.
112 */
113 void
st_update_sample_state(struct st_context * st)114 st_update_sample_state(struct st_context *st)
115 {
116 unsigned sample_mask = 0xffffffff;
117 unsigned sample_count = st->state.fb_num_samples;
118
119 if (_mesa_is_multisample_enabled(st->ctx) && sample_count > 1) {
120 /* unlike in gallium/d3d10 the mask is only active if msaa is enabled */
121 if (st->ctx->Multisample.SampleCoverage) {
122 unsigned nr_bits = (unsigned)
123 (st->ctx->Multisample.SampleCoverageValue * (float) sample_count);
124 /* there's lot of ways how to do this. We just use first few bits,
125 * since we have no knowledge of sample positions here. When
126 * app-supplied mask though is used too might need to be smarter.
127 * Also, there's an interface restriction here in theory it is
128 * encouraged this mask not be the same at each pixel.
129 */
130 sample_mask = (1 << nr_bits) - 1;
131 if (st->ctx->Multisample.SampleCoverageInvert)
132 sample_mask = ~sample_mask;
133 }
134 if (st->ctx->Multisample.SampleMask)
135 sample_mask &= st->ctx->Multisample.SampleMaskValue;
136 }
137
138 cso_set_sample_mask(st->cso_context, sample_mask);
139
140 update_sample_locations(st);
141 }
142
143
144 void
st_update_sample_shading(struct st_context * st)145 st_update_sample_shading(struct st_context *st)
146 {
147 if (!st->fp)
148 return;
149
150 if (!st->ctx->Extensions.ARB_sample_shading)
151 return;
152
153 cso_set_min_samples(st->cso_context,
154 _mesa_get_min_invocations_per_fragment(st->ctx, &st->fp->Base));
155 }
156