2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/mem.h"
23 #include "libavutil/avassert.h"
26 #include <glslang/Include/ResourceLimits.h>
27 #include <glslang/Include/revision.h>
28 #include <glslang/Public/ShaderLang.h>
29 #include <glslang/SPIRV/GlslangToSpv.h>
33 using namespace glslang;
35 static pthread_mutex_t glslang_mutex = PTHREAD_MUTEX_INITIALIZER;
36 static int glslang_refcount = 0;
38 /* We require Vulkan 1.1 */
39 #define GLSL_VERSION EShTargetVulkan_1_1
41 /* Vulkan 1.1 implementations require SPIR-V 1.3 to be implemented */
42 #define SPIRV_VERSION EShTargetSpv_1_3
44 // Taken from glslang's examples, which apparently generally bases the choices
45 // on OpenGL specification limits
46 static const TBuiltInResource DefaultTBuiltInResource = {
47 /* .MaxLights = */ 32,
48 /* .MaxClipPlanes = */ 6,
49 /* .MaxTextureUnits = */ 32,
50 /* .MaxTextureCoords = */ 32,
51 /* .MaxVertexAttribs = */ 64,
52 /* .MaxVertexUniformComponents = */ 4096,
53 /* .MaxVaryingFloats = */ 64,
54 /* .MaxVertexTextureImageUnits = */ 32,
55 /* .MaxCombinedTextureImageUnits = */ 80,
56 /* .MaxTextureImageUnits = */ 32,
57 /* .MaxFragmentUniformComponents = */ 4096,
58 /* .MaxDrawBuffers = */ 32,
59 /* .MaxVertexUniformVectors = */ 128,
60 /* .MaxVaryingVectors = */ 8,
61 /* .MaxFragmentUniformVectors = */ 16,
62 /* .MaxVertexOutputVectors = */ 16,
63 /* .MaxFragmentInputVectors = */ 15,
64 /* .MinProgramTexelOffset = */ -8,
65 /* .MaxProgramTexelOffset = */ 7,
66 /* .MaxClipDistances = */ 8,
67 /* .MaxComputeWorkGroupCountX = */ 65535,
68 /* .MaxComputeWorkGroupCountY = */ 65535,
69 /* .MaxComputeWorkGroupCountZ = */ 65535,
70 /* .MaxComputeWorkGroupSizeX = */ 1024,
71 /* .MaxComputeWorkGroupSizeY = */ 1024,
72 /* .MaxComputeWorkGroupSizeZ = */ 64,
73 /* .MaxComputeUniformComponents = */ 1024,
74 /* .MaxComputeTextureImageUnits = */ 16,
75 /* .MaxComputeImageUniforms = */ 8,
76 /* .MaxComputeAtomicCounters = */ 8,
77 /* .MaxComputeAtomicCounterBuffers = */ 1,
78 /* .MaxVaryingComponents = */ 60,
79 /* .MaxVertexOutputComponents = */ 64,
80 /* .MaxGeometryInputComponents = */ 64,
81 /* .MaxGeometryOutputComponents = */ 128,
82 /* .MaxFragmentInputComponents = */ 128,
83 /* .MaxImageUnits = */ 8,
84 /* .MaxCombinedImageUnitsAndFragmentOutputs = */ 8,
85 /* .MaxCombinedShaderOutputResources = */ 8,
86 /* .MaxImageSamples = */ 0,
87 /* .MaxVertexImageUniforms = */ 0,
88 /* .MaxTessControlImageUniforms = */ 0,
89 /* .MaxTessEvaluationImageUniforms = */ 0,
90 /* .MaxGeometryImageUniforms = */ 0,
91 /* .MaxFragmentImageUniforms = */ 8,
92 /* .MaxCombinedImageUniforms = */ 8,
93 /* .MaxGeometryTextureImageUnits = */ 16,
94 /* .MaxGeometryOutputVertices = */ 256,
95 /* .MaxGeometryTotalOutputComponents = */ 1024,
96 /* .MaxGeometryUniformComponents = */ 1024,
97 /* .MaxGeometryVaryingComponents = */ 64,
98 /* .MaxTessControlInputComponents = */ 128,
99 /* .MaxTessControlOutputComponents = */ 128,
100 /* .MaxTessControlTextureImageUnits = */ 16,
101 /* .MaxTessControlUniformComponents = */ 1024,
102 /* .MaxTessControlTotalOutputComponents = */ 4096,
103 /* .MaxTessEvaluationInputComponents = */ 128,
104 /* .MaxTessEvaluationOutputComponents = */ 128,
105 /* .MaxTessEvaluationTextureImageUnits = */ 16,
106 /* .MaxTessEvaluationUniformComponents = */ 1024,
107 /* .MaxTessPatchComponents = */ 120,
108 /* .MaxPatchVertices = */ 32,
109 /* .MaxTessGenLevel = */ 64,
110 /* .MaxViewports = */ 16,
111 /* .MaxVertexAtomicCounters = */ 0,
112 /* .MaxTessControlAtomicCounters = */ 0,
113 /* .MaxTessEvaluationAtomicCounters = */ 0,
114 /* .MaxGeometryAtomicCounters = */ 0,
115 /* .MaxFragmentAtomicCounters = */ 8,
116 /* .MaxCombinedAtomicCounters = */ 8,
117 /* .MaxAtomicCounterBindings = */ 1,
118 /* .MaxVertexAtomicCounterBuffers = */ 0,
119 /* .MaxTessControlAtomicCounterBuffers = */ 0,
120 /* .MaxTessEvaluationAtomicCounterBuffers = */ 0,
121 /* .MaxGeometryAtomicCounterBuffers = */ 0,
122 /* .MaxFragmentAtomicCounterBuffers = */ 1,
123 /* .MaxCombinedAtomicCounterBuffers = */ 1,
124 /* .MaxAtomicCounterBufferSize = */ 16384,
125 /* .MaxTransformFeedbackBuffers = */ 4,
126 /* .MaxTransformFeedbackInterleavedComponents = */ 64,
127 /* .MaxCullDistances = */ 8,
128 /* .MaxCombinedClipAndCullDistances = */ 8,
129 /* .MaxSamples = */ 4,
130 /* .maxMeshOutputVerticesNV = */ 256,
131 /* .maxMeshOutputPrimitivesNV = */ 512,
132 /* .maxMeshWorkGroupSizeX_NV = */ 32,
133 /* .maxMeshWorkGroupSizeY_NV = */ 1,
134 /* .maxMeshWorkGroupSizeZ_NV = */ 1,
135 /* .maxTaskWorkGroupSizeX_NV = */ 32,
136 /* .maxTaskWorkGroupSizeY_NV = */ 1,
137 /* .maxTaskWorkGroupSizeZ_NV = */ 1,
138 /* .maxMeshViewCountNV = */ 4,
141 /* .nonInductiveForLoops = */ 1,
142 /* .whileLoops = */ 1,
143 /* .doWhileLoops = */ 1,
144 /* .generalUniformIndexing = */ 1,
145 /* .generalAttributeMatrixVectorIndexing = */ 1,
146 /* .generalVaryingIndexing = */ 1,
147 /* .generalSamplerIndexing = */ 1,
148 /* .generalVariableIndexing = */ 1,
149 /* .generalConstantMatrixVectorIndexing = */ 1,
153 GLSlangResult *glslang_compile(const char *glsl, enum GLSlangStage stage)
155 GLSlangResult *res = (GLSlangResult *)av_mallocz(sizeof(*res));
159 static const EShLanguage lang[] = {
160 [GLSLANG_VERTEX] = EShLangVertex,
161 [GLSLANG_FRAGMENT] = EShLangFragment,
162 [GLSLANG_COMPUTE] = EShLangCompute,
165 assert(glslang_refcount);
166 TShader *shader = new TShader(lang[stage]);
168 res->rval = AVERROR(ENOMEM);
172 shader->setEnvClient(EShClientVulkan, GLSL_VERSION);
173 shader->setEnvTarget(EShTargetSpv, SPIRV_VERSION);
174 shader->setStrings(&glsl, 1);
175 if (!shader->parse(&DefaultTBuiltInResource, GLSL_VERSION, true, EShMsgDefault)) {
176 res->error_msg = av_strdup(shader->getInfoLog());
177 res->rval = AVERROR_EXTERNAL;
182 TProgram *prog = new TProgram();
184 res->rval = AVERROR(ENOMEM);
189 prog->addShader(shader);
190 if (!prog->link(EShMsgDefault)) {
191 res->error_msg = av_strdup(prog->getInfoLog());
192 res->rval = AVERROR_EXTERNAL;
198 std::vector<unsigned int> spirv; /* Result */
200 SpvOptions options; /* Options - by default all optimizations are off */
201 options.generateDebugInfo = false; /* Makes sense for files but not here */
202 options.disassemble = false; /* Will print disassembly on compilation */
203 options.validate = false; /* Validates the generated SPIRV, unneeded */
204 options.disableOptimizer = false; /* For debugging */
205 options.optimizeSize = true; /* Its faster */
207 GlslangToSpv(*prog->getIntermediate(lang[stage]), spirv, NULL, &options);
209 res->size = spirv.size()*sizeof(unsigned int);
210 res->data = av_memdup(spirv.data(), res->size);
212 res->rval = AVERROR(ENOMEM);
224 int glslang_init(void)
228 pthread_mutex_lock(&glslang_mutex);
229 if (glslang_refcount++ == 0)
230 ret = !InitializeProcess();
231 pthread_mutex_unlock(&glslang_mutex);
236 void glslang_uninit(void)
238 pthread_mutex_lock(&glslang_mutex);
239 av_assert0(glslang_refcount > 0);
240 if (--glslang_refcount == 0)
242 pthread_mutex_unlock(&glslang_mutex);