1 /**************************************************************************
3 * Copyright 2010 VMware, Inc.
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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.
26 **************************************************************************/
29 #include "st_context.h"
30 #include "pipe/p_screen.h"
31 #include "pipe/p_context.h"
33 #include "st_program.h"
35 #include "cso_cache/cso_context.h"
36 #include "util/u_framebuffer.h"
37 #include "main/framebuffer.h"
41 * Update the sample locations
44 update_sample_locations(struct st_context
*st
)
46 struct gl_framebuffer
*fb
= st
->ctx
->DrawBuffer
;
48 if (!st
->ctx
->Extensions
.ARB_sample_locations
)
51 if (fb
->ProgrammableSampleLocations
) {
52 unsigned grid_width
, grid_height
, size
, pixel
, sample_index
;
53 unsigned samples
= st
->state
.fb_num_samples
;
54 bool sample_location_pixel_grid
= fb
->SampleLocationPixelGrid
;
56 PIPE_MAX_SAMPLE_LOCATION_GRID_SIZE
*
57 PIPE_MAX_SAMPLE_LOCATION_GRID_SIZE
* 32];
59 st
->pipe
->screen
->get_sample_pixel_grid(
60 st
->pipe
->screen
, samples
, &grid_width
, &grid_height
);
61 size
= grid_width
* grid_height
* samples
;
64 * when a dimension is greater than MAX_SAMPLE_LOCATION_GRID_SIZE,
65 * st->ctx->Driver.GetSamplePixelGrid() returns 1 for both dimensions.
67 if (grid_width
> MAX_SAMPLE_LOCATION_GRID_SIZE
||
68 grid_height
> MAX_SAMPLE_LOCATION_GRID_SIZE
)
69 sample_location_pixel_grid
= false;
71 for (pixel
= 0; pixel
< grid_width
* grid_height
; pixel
++) {
72 for (sample_index
= 0; sample_index
< samples
; sample_index
++) {
73 int table_index
= sample_index
;
74 float x
= 0.5f
, y
= 0.5f
;
76 if (sample_location_pixel_grid
)
77 table_index
= pixel
* samples
+ sample_index
;
78 if (fb
->SampleLocationTable
) {
79 x
= fb
->SampleLocationTable
[table_index
*2];
80 y
= fb
->SampleLocationTable
[table_index
*2+1];
82 if (st
->state
.fb_orientation
== Y_0_BOTTOM
)
85 loc
= roundf(CLAMP(x
* 16.0f
, 0.0f
, 15.0f
));
86 loc
|= (int)roundf(CLAMP(y
* 16.0f
, 0.0f
, 15.0f
)) << 4;
87 locations
[pixel
* samples
+ sample_index
] = loc
;
91 util_sample_locations_flip_y(
92 st
->pipe
->screen
, st
->state
.fb_height
, samples
, locations
);
94 if (!st
->state
.enable_sample_locations
||
95 st
->state
.sample_locations_samples
!= samples
||
96 memcmp(locations
, st
->state
.sample_locations
, size
) != 0) {
97 st
->pipe
->set_sample_locations( st
->pipe
, size
, locations
);
99 st
->state
.sample_locations_samples
= samples
;
100 memcpy(st
->state
.sample_locations
, locations
, size
);
102 } else if (st
->state
.enable_sample_locations
) {
103 st
->pipe
->set_sample_locations(st
->pipe
, 0, NULL
);
106 st
->state
.enable_sample_locations
= fb
->ProgrammableSampleLocations
;
110 /* Update the sample mask and locations for MSAA.
113 st_update_sample_state(struct st_context
*st
)
115 unsigned sample_mask
= 0xffffffff;
116 unsigned sample_count
= st
->state
.fb_num_samples
;
118 if (_mesa_is_multisample_enabled(st
->ctx
) && sample_count
> 1) {
119 /* unlike in gallium/d3d10 the mask is only active if msaa is enabled */
120 if (st
->ctx
->Multisample
.SampleCoverage
) {
121 unsigned nr_bits
= (unsigned)
122 (st
->ctx
->Multisample
.SampleCoverageValue
* (float) sample_count
);
123 /* there's lot of ways how to do this. We just use first few bits,
124 * since we have no knowledge of sample positions here. When
125 * app-supplied mask though is used too might need to be smarter.
126 * Also, there's an interface restriction here in theory it is
127 * encouraged this mask not be the same at each pixel.
129 sample_mask
= (1 << nr_bits
) - 1;
130 if (st
->ctx
->Multisample
.SampleCoverageInvert
)
131 sample_mask
= ~sample_mask
;
133 if (st
->ctx
->Multisample
.SampleMask
)
134 sample_mask
&= st
->ctx
->Multisample
.SampleMaskValue
;
137 cso_set_sample_mask(st
->cso_context
, sample_mask
);
139 update_sample_locations(st
);
144 st_update_sample_shading(struct st_context
*st
)
149 if (!st
->ctx
->Extensions
.ARB_sample_shading
)
152 cso_set_min_samples(st
->cso_context
,
153 _mesa_get_min_invocations_per_fragment(st
->ctx
, &st
->fp
->Base
));