1/*
2 * Copyright © 2017 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 * on the rights to use, copy, modify, merge, publish, distribute, sub
8 * license, and/or sell copies of the Software, and to permit persons to whom
9 * the 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 NON-INFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
21 * USE OR OTHER DEALINGS IN THE SOFTWARE.
22 */
23
24/**
25 * \file
26 * \brief SPIRV-V extension handling. See ARB_spirv_extensions
27 */
28
29#include <stdbool.h>
30#include "spirv_extensions.h"
31
32GLuint
33_mesa_get_spirv_extension_count(struct gl_context *ctx)
34{
35   if (ctx->Const.SpirVExtensions == NULL)
36      return 0;
37
38   return ctx->Const.SpirVExtensions->count;
39}
40
41const GLubyte *
42_mesa_get_enabled_spirv_extension(struct gl_context *ctx,
43                                  GLuint index)
44{
45   unsigned int n = 0;
46
47   if (ctx->Const.SpirVExtensions == NULL)
48      return (const GLubyte *) 0;
49
50   for (unsigned int i = 0; i < SPV_EXTENSIONS_COUNT; i++) {
51      if (ctx->Const.SpirVExtensions->supported[i]) {
52         if (n == index)
53            return (const GLubyte *) _mesa_spirv_extensions_to_string(i);
54         else
55            n++;
56      }
57   }
58
59   return (const GLubyte *) 0;
60}
61
62const char *
63_mesa_spirv_extensions_to_string(enum SpvExtension ext)
64{
65#define STR(x) case x: return #x;
66   switch (ext) {
67   STR(SPV_KHR_16bit_storage);
68   STR(SPV_KHR_device_group);
69   STR(SPV_KHR_multiview);
70   STR(SPV_KHR_shader_ballot);
71   STR(SPV_KHR_shader_draw_parameters);
72   STR(SPV_KHR_storage_buffer_storage_class);
73   STR(SPV_KHR_subgroup_vote);
74   STR(SPV_KHR_variable_pointers);
75   STR(SPV_AMD_gcn_shader);
76   case SPV_EXTENSIONS_COUNT:
77      unreachable("Unknown SPIR-V extension");
78   }
79#undef STR
80
81   return "unknown";
82}
83
84/**
85 * Sets the supported flags for known SPIR-V extensions based on the
86 * capabilites supported (spirv capabilities based on the spirv to nir
87 * support).
88 *
89 * One could argue that makes more sense in the other way around, as from the
90 * spec pov capabilities are enable for a given extension. But from our pov,
91 * we support or not (depending on the driver) some given capability, and
92 * spirv_to_nir check for capabilities not extensions. Also we usually fill
93 * first the supported capabilities, that are not always related to an
94 * extension.
95 */
96void
97_mesa_fill_supported_spirv_extensions(struct spirv_supported_extensions *ext,
98                                      const struct spirv_supported_capabilities *cap)
99{
100   memset(ext->supported, 0, sizeof(ext->supported));
101
102   ext->count = 0;
103
104   ext->supported[SPV_KHR_shader_draw_parameters] = cap->draw_parameters;
105   ext->supported[SPV_KHR_multiview] = cap->multiview;
106   ext->supported[SPV_KHR_storage_buffer_storage_class] = true;
107   ext->supported[SPV_KHR_variable_pointers] = cap->variable_pointers;
108   ext->supported[SPV_AMD_gcn_shader] = cap->amd_gcn_shader;
109   ext->supported[SPV_KHR_shader_ballot] = cap->subgroup_ballot;
110   ext->supported[SPV_KHR_subgroup_vote] = cap->subgroup_vote;
111
112   for (unsigned i = 0; i < SPV_EXTENSIONS_COUNT; i++) {
113      if (ext->supported[i])
114         ext->count++;
115   }
116}
117