lavfi/glslang: migrate to the C API and robustify library detection

Finally, this is as close to usable as it gets for glslang.
Much faster to compile as well, and eliminates the need for a C++
compiler, which is great.
Also, changes to the resource limits won't break users, as we
can use designated initializers in C90.

1 files changed, 0 insertions, 241 deletions

diff --git a/libavfilter/glslang.cpp b/libavfilter/glslang.cpp
deleted file mode 100644
index 986bddd789..0000000000
--- a/libavfilter/glslang.cpp
+++ /dev/null
@@ -1,241 +0,0 @@
-/*
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <pthread.h>
-
-extern "C" {
-#include "libavutil/mem.h"
-#include "libavutil/avassert.h"
-}
-
-#include <glslang/Include/ResourceLimits.h>
-#include <glslang/Public/ShaderLang.h>
-#include <glslang/SPIRV/GlslangToSpv.h>
-
-#include "glslang.h"
-
-using namespace glslang;
-
-static pthread_mutex_t glslang_mutex = PTHREAD_MUTEX_INITIALIZER;
-static int glslang_refcount = 0;
-
-/* We require Vulkan 1.1 */
-#define GLSL_VERSION EShTargetVulkan_1_1
-
-/* Vulkan 1.1 implementations require SPIR-V 1.3 to be implemented */
-#define SPIRV_VERSION EShTargetSpv_1_3
-
-// Taken from glslang's examples, which apparently generally bases the choices
-// on OpenGL specification limits
-static const TBuiltInResource DefaultTBuiltInResource = {
-    /* .MaxLights = */ 32,
-    /* .MaxClipPlanes = */ 6,
-    /* .MaxTextureUnits = */ 32,
-    /* .MaxTextureCoords = */ 32,
-    /* .MaxVertexAttribs = */ 64,
-    /* .MaxVertexUniformComponents = */ 4096,
-    /* .MaxVaryingFloats = */ 64,
-    /* .MaxVertexTextureImageUnits = */ 32,
-    /* .MaxCombinedTextureImageUnits = */ 80,
-    /* .MaxTextureImageUnits = */ 32,
-    /* .MaxFragmentUniformComponents = */ 4096,
-    /* .MaxDrawBuffers = */ 32,
-    /* .MaxVertexUniformVectors = */ 128,
-    /* .MaxVaryingVectors = */ 8,
-    /* .MaxFragmentUniformVectors = */ 16,
-    /* .MaxVertexOutputVectors = */ 16,
-    /* .MaxFragmentInputVectors = */ 15,
-    /* .MinProgramTexelOffset = */ -8,
-    /* .MaxProgramTexelOffset = */ 7,
-    /* .MaxClipDistances = */ 8,
-    /* .MaxComputeWorkGroupCountX = */ 65535,
-    /* .MaxComputeWorkGroupCountY = */ 65535,
-    /* .MaxComputeWorkGroupCountZ = */ 65535,
-    /* .MaxComputeWorkGroupSizeX = */ 1024,
-    /* .MaxComputeWorkGroupSizeY = */ 1024,
-    /* .MaxComputeWorkGroupSizeZ = */ 64,
-    /* .MaxComputeUniformComponents = */ 1024,
-    /* .MaxComputeTextureImageUnits = */ 16,
-    /* .MaxComputeImageUniforms = */ 8,
-    /* .MaxComputeAtomicCounters = */ 8,
-    /* .MaxComputeAtomicCounterBuffers = */ 1,
-    /* .MaxVaryingComponents = */ 60,
-    /* .MaxVertexOutputComponents = */ 64,
-    /* .MaxGeometryInputComponents = */ 64,
-    /* .MaxGeometryOutputComponents = */ 128,
-    /* .MaxFragmentInputComponents = */ 128,
-    /* .MaxImageUnits = */ 8,
-    /* .MaxCombinedImageUnitsAndFragmentOutputs = */ 8,
-    /* .MaxCombinedShaderOutputResources = */ 8,
-    /* .MaxImageSamples = */ 0,
-    /* .MaxVertexImageUniforms = */ 0,
-    /* .MaxTessControlImageUniforms = */ 0,
-    /* .MaxTessEvaluationImageUniforms = */ 0,
-    /* .MaxGeometryImageUniforms = */ 0,
-    /* .MaxFragmentImageUniforms = */ 8,
-    /* .MaxCombinedImageUniforms = */ 8,
-    /* .MaxGeometryTextureImageUnits = */ 16,
-    /* .MaxGeometryOutputVertices = */ 256,
-    /* .MaxGeometryTotalOutputComponents = */ 1024,
-    /* .MaxGeometryUniformComponents = */ 1024,
-    /* .MaxGeometryVaryingComponents = */ 64,
-    /* .MaxTessControlInputComponents = */ 128,
-    /* .MaxTessControlOutputComponents = */ 128,
-    /* .MaxTessControlTextureImageUnits = */ 16,
-    /* .MaxTessControlUniformComponents = */ 1024,
-    /* .MaxTessControlTotalOutputComponents = */ 4096,
-    /* .MaxTessEvaluationInputComponents = */ 128,
-    /* .MaxTessEvaluationOutputComponents = */ 128,
-    /* .MaxTessEvaluationTextureImageUnits = */ 16,
-    /* .MaxTessEvaluationUniformComponents = */ 1024,
-    /* .MaxTessPatchComponents = */ 120,
-    /* .MaxPatchVertices = */ 32,
-    /* .MaxTessGenLevel = */ 64,
-    /* .MaxViewports = */ 16,
-    /* .MaxVertexAtomicCounters = */ 0,
-    /* .MaxTessControlAtomicCounters = */ 0,
-    /* .MaxTessEvaluationAtomicCounters = */ 0,
-    /* .MaxGeometryAtomicCounters = */ 0,
-    /* .MaxFragmentAtomicCounters = */ 8,
-    /* .MaxCombinedAtomicCounters = */ 8,
-    /* .MaxAtomicCounterBindings = */ 1,
-    /* .MaxVertexAtomicCounterBuffers = */ 0,
-    /* .MaxTessControlAtomicCounterBuffers = */ 0,
-    /* .MaxTessEvaluationAtomicCounterBuffers = */ 0,
-    /* .MaxGeometryAtomicCounterBuffers = */ 0,
-    /* .MaxFragmentAtomicCounterBuffers = */ 1,
-    /* .MaxCombinedAtomicCounterBuffers = */ 1,
-    /* .MaxAtomicCounterBufferSize = */ 16384,
-    /* .MaxTransformFeedbackBuffers = */ 4,
-    /* .MaxTransformFeedbackInterleavedComponents = */ 64,
-    /* .MaxCullDistances = */ 8,
-    /* .MaxCombinedClipAndCullDistances = */ 8,
-    /* .MaxSamples = */ 4,
-    /* .maxMeshOutputVerticesNV = */ 256,
-    /* .maxMeshOutputPrimitivesNV = */ 512,
-    /* .maxMeshWorkGroupSizeX_NV = */ 32,
-    /* .maxMeshWorkGroupSizeY_NV = */ 1,
-    /* .maxMeshWorkGroupSizeZ_NV = */ 1,
-    /* .maxTaskWorkGroupSizeX_NV = */ 32,
-    /* .maxTaskWorkGroupSizeY_NV = */ 1,
-    /* .maxTaskWorkGroupSizeZ_NV = */ 1,
-    /* .maxMeshViewCountNV = */ 4,
-
-    .limits = {
-        /* .nonInductiveForLoops = */ 1,
-        /* .whileLoops = */ 1,
-        /* .doWhileLoops = */ 1,
-        /* .generalUniformIndexing = */ 1,
-        /* .generalAttributeMatrixVectorIndexing = */ 1,
-        /* .generalVaryingIndexing = */ 1,
-        /* .generalSamplerIndexing = */ 1,
-        /* .generalVariableIndexing = */ 1,
-        /* .generalConstantMatrixVectorIndexing = */ 1,
-    }
-};
-
-GLSlangResult *glslang_compile(const char *glsl, enum GLSlangStage stage)
-{
-    GLSlangResult *res = (GLSlangResult *)av_mallocz(sizeof(*res));
-    if (!res)
-        return NULL;
-
-    static const EShLanguage lang[] = {
-        [GLSLANG_VERTEX]   = EShLangVertex,
-        [GLSLANG_FRAGMENT] = EShLangFragment,
-        [GLSLANG_COMPUTE]  = EShLangCompute,
-    };
-
-    assert(glslang_refcount);
-    TShader *shader = new TShader(lang[stage]);
-    if (!shader) {
-        res->rval = AVERROR(ENOMEM);
-        return res;
-    }
-
-    shader->setEnvClient(EShClientVulkan, GLSL_VERSION);
-    shader->setEnvTarget(EShTargetSpv, SPIRV_VERSION);
-    shader->setStrings(&glsl, 1);
-    if (!shader->parse(&DefaultTBuiltInResource, GLSL_VERSION, true, EShMsgDefault)) {
-        res->error_msg = av_strdup(shader->getInfoLog());
-        res->rval = AVERROR_EXTERNAL;
-        delete shader;
-        return res;
-    }
-
-    TProgram *prog = new TProgram();
-    if (!prog) {
-        res->rval = AVERROR(ENOMEM);
-        delete shader;
-        return res;
-    }
-
-    prog->addShader(shader);
-    if (!prog->link(EShMsgDefault)) {
-        res->error_msg = av_strdup(prog->getInfoLog());
-        res->rval = AVERROR_EXTERNAL;
-        delete shader;
-        delete prog;
-        return res;
-    }
-
-    std::vector<unsigned int> spirv; /* Result */
-
-    SpvOptions options; /* Options - by default all optimizations are off */
-    options.generateDebugInfo = false; /* Makes sense for files but not here */
-    options.disassemble = false; /* Will print disassembly on compilation */
-    options.validate = false; /* Validates the generated SPIRV, unneeded */
-    options.disableOptimizer = false; /* For debugging */
-    options.optimizeSize = true; /* Its faster */
-
-    GlslangToSpv(*prog->getIntermediate(lang[stage]), spirv, NULL, &options);
-
-    res->size = spirv.size()*sizeof(unsigned int);
-    res->data = av_memdup(spirv.data(), res->size);
-    if (!res->data) {
-        res->rval = AVERROR(ENOMEM);
-        delete shader;
-        delete prog;
-        return res;
-    }
-
-    delete shader;
-    delete prog;
-
-    return res;
-}
-
-int glslang_init(void)
-{
-    int ret = 0;
-
-    pthread_mutex_lock(&glslang_mutex);
-    if (glslang_refcount++ == 0)
-        ret = !InitializeProcess();
-    pthread_mutex_unlock(&glslang_mutex);
-
-    return ret;
-}
-
-void glslang_uninit(void)
-{
-    pthread_mutex_lock(&glslang_mutex);
-    if (glslang_refcount && (--glslang_refcount == 0))
-        FinalizeProcess();
-    pthread_mutex_unlock(&glslang_mutex);
-}