1 /*
2 * Copyright © 2015 Intel Corporation
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21 * IN THE SOFTWARE.
22 */
23
24 #include "brw_context.h"
25 #include "brw_state.h"
26 #include "main/context.h"
27 #include "main/formatquery.h"
28 #include "main/glformats.h"
29
30 static size_t
brw_query_samples_for_format(struct gl_context * ctx,GLenum target,GLenum internalFormat,int samples[16])31 brw_query_samples_for_format(struct gl_context *ctx, GLenum target,
32 GLenum internalFormat, int samples[16])
33 {
34 struct brw_context *brw = brw_context(ctx);
35 const struct gen_device_info *devinfo = &brw->screen->devinfo;
36
37 (void) target;
38 (void) internalFormat;
39
40 switch (devinfo->gen) {
41 case 10:
42 case 9:
43 samples[0] = 16;
44 samples[1] = 8;
45 samples[2] = 4;
46 samples[3] = 2;
47 return 4;
48
49 case 8:
50 samples[0] = 8;
51 samples[1] = 4;
52 samples[2] = 2;
53 return 3;
54
55 case 7:
56 if (internalFormat == GL_RGBA32F && _mesa_is_gles(ctx)) {
57 /* For GLES, we are allowed to return a smaller number of samples for
58 * GL_RGBA32F. See OpenGLES 3.2 spec, section 20.3.1 Internal Format
59 * Query Parameters, under SAMPLES:
60 *
61 * "A value less than or equal to the value of MAX_SAMPLES, if
62 * internalformat is RGBA16F, R32F, RG32F, or RGBA32F."
63 *
64 * In brw_render_target_supported, we prevent formats with a size
65 * greater than 8 bytes from using 8x MSAA on gen7.
66 */
67 samples[0] = 4;
68 return 1;
69 } else {
70 samples[0] = 8;
71 samples[1] = 4;
72 return 2;
73 }
74
75 case 6:
76 samples[0] = 4;
77 return 1;
78
79 default:
80 assert(devinfo->gen < 6);
81 samples[0] = 1;
82 return 1;
83 }
84 }
85
86 void
brw_query_internal_format(struct gl_context * ctx,GLenum target,GLenum internalFormat,GLenum pname,GLint * params)87 brw_query_internal_format(struct gl_context *ctx, GLenum target,
88 GLenum internalFormat, GLenum pname, GLint *params)
89 {
90 /* The Mesa layer gives us a temporary params buffer that is guaranteed
91 * to be non-NULL, and have at least 16 elements.
92 */
93 assert(params != NULL);
94
95 switch (pname) {
96 case GL_SAMPLES:
97 brw_query_samples_for_format(ctx, target, internalFormat, params);
98 break;
99
100 case GL_NUM_SAMPLE_COUNTS: {
101 size_t num_samples;
102 GLint dummy_buffer[16];
103
104 num_samples = brw_query_samples_for_format(ctx, target, internalFormat,
105 dummy_buffer);
106 params[0] = (GLint) num_samples;
107 break;
108 }
109
110 default:
111 /* By default, we call the driver hook's fallback function from the frontend,
112 * which has generic implementation for all pnames.
113 */
114 _mesa_query_internal_format_default(ctx, target, internalFormat, pname,
115 params);
116 break;
117 }
118 }
119