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
36 (void) target;
37 (void) internalFormat;
38
39 switch (brw->gen) {
40 case 9:
41 samples[0] = 16;
42 samples[1] = 8;
43 samples[2] = 4;
44 samples[3] = 2;
45 return 4;
46
47 case 8:
48 samples[0] = 8;
49 samples[1] = 4;
50 samples[2] = 2;
51 return 3;
52
53 case 7:
54 if (internalFormat == GL_RGBA32F && _mesa_is_gles(ctx)) {
55 /* For GLES, we are allowed to return a smaller number of samples for
56 * GL_RGBA32F. See OpenGLES 3.2 spec, section 20.3.1 Internal Format
57 * Query Parameters, under SAMPLES:
58 *
59 * "A value less than or equal to the value of MAX_SAMPLES, if
60 * internalformat is RGBA16F, R32F, RG32F, or RGBA32F."
61 *
62 * In brw_render_target_supported, we prevent formats with a size
63 * greater than 8 bytes from using 8x MSAA on gen7.
64 */
65 samples[0] = 4;
66 return 1;
67 } else {
68 samples[0] = 8;
69 samples[1] = 4;
70 return 2;
71 }
72
73 case 6:
74 samples[0] = 4;
75 return 1;
76
77 default:
78 assert(brw->gen < 6);
79 samples[0] = 1;
80 return 1;
81 }
82 }
83
84 void
brw_query_internal_format(struct gl_context * ctx,GLenum target,GLenum internalFormat,GLenum pname,GLint * params)85 brw_query_internal_format(struct gl_context *ctx, GLenum target,
86 GLenum internalFormat, GLenum pname, GLint *params)
87 {
88 /* The Mesa layer gives us a temporary params buffer that is guaranteed
89 * to be non-NULL, and have at least 16 elements.
90 */
91 assert(params != NULL);
92
93 switch (pname) {
94 case GL_SAMPLES:
95 brw_query_samples_for_format(ctx, target, internalFormat, params);
96 break;
97
98 case GL_NUM_SAMPLE_COUNTS: {
99 size_t num_samples;
100 GLint dummy_buffer[16];
101
102 num_samples = brw_query_samples_for_format(ctx, target, internalFormat,
103 dummy_buffer);
104 params[0] = (GLint) num_samples;
105 break;
106 }
107
108 default:
109 /* By default, we call the driver hook's fallback function from the frontend,
110 * which has generic implementation for all pnames.
111 */
112 _mesa_query_internal_format_default(ctx, target, internalFormat, pname,
113 params);
114 break;
115 }
116 }
117