42248408a9
All instructions but OpVariable and OpLabel are automatically emitted. These functions have to call AddLocalVariable/AddGlobalVariable or AddLabel respectively.
89 lines
3.3 KiB
C++
89 lines
3.3 KiB
C++
/* This file is part of the sirit project.
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* Copyright (c) 2019 sirit
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* This software may be used and distributed according to the terms of the
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* 3-Clause BSD License
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*/
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#include <cstdio>
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#include <cstdlib>
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#include <sirit/sirit.h>
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using u32 = uint32_t;
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class MyModule : public Sirit::Module {
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public:
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MyModule() = default;
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~MyModule() = default;
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void Generate() {
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AddCapability(spv::Capability::Shader);
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SetMemoryModel(spv::AddressingModel::Logical, spv::MemoryModel::GLSL450);
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const auto t_void = Name(TypeVoid(), "void");
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const auto t_uint = Name(TypeInt(32, false), "uint");
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const auto t_float = Name(TypeFloat(32), "float");
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const auto float4 = Name(TypeVector(t_float, 4), "float4");
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const auto in_float = Name(TypePointer(spv::StorageClass::Input, t_float), "in_float");
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const auto in_float4 = Name(TypePointer(spv::StorageClass::Input, float4), "in_float4");
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const auto out_float4 =
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Name(TypePointer(spv::StorageClass::Output, float4), "out_float4");
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const auto gl_per_vertex = Name(TypeStruct(float4), "gl_PerVertex");
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const auto gl_per_vertex_ptr =
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Name(TypePointer(spv::StorageClass::Output, gl_per_vertex), "out_gl_PerVertex");
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const auto in_pos = Name(OpVariable(in_float4, spv::StorageClass::Input), "in_pos");
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const auto per_vertex =
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Name(OpVariable(gl_per_vertex_ptr, spv::StorageClass::Output), "per_vertex");
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Decorate(in_pos, spv::Decoration::Location, 0);
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Decorate(gl_per_vertex, spv::Decoration::Block);
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Decorate(gl_per_vertex, spv::Decoration::Block);
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MemberDecorate(gl_per_vertex, 0, spv::Decoration::BuiltIn,
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static_cast<u32>(spv::BuiltIn::Position));
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AddGlobalVariable(in_pos);
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AddGlobalVariable(per_vertex);
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const auto main_func =
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Name(OpFunction(t_void, spv::FunctionControlMask::MaskNone, TypeFunction(t_void)),
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"main");
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AddLabel();
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const auto ptr_pos_x = OpAccessChain(in_float, in_pos, Constant(t_uint, 0u));
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const auto ptr_pos_y = OpAccessChain(in_float, in_pos, Constant(t_uint, 1u));
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const auto pos_x = OpLoad(t_float, ptr_pos_x);
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const auto pos_y = OpLoad(t_float, ptr_pos_y);
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auto tmp_position = OpUndef(float4);
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Decorate(tmp_position, spv::Decoration::FPRoundingMode,
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static_cast<u32>(spv::FPRoundingMode::RTE));
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tmp_position = OpCompositeInsert(float4, pos_x, tmp_position, 0);
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tmp_position = OpCompositeInsert(float4, pos_y, tmp_position, 1);
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tmp_position = OpCompositeInsert(float4, Constant(t_float, 0.f), tmp_position, 2);
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tmp_position = OpCompositeInsert(float4, Constant(t_float, 1.f), tmp_position, 3);
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const auto gl_position = OpAccessChain(out_float4, per_vertex, Constant(t_uint, 0u));
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OpStore(gl_position, tmp_position);
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OpReturn();
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OpFunctionEnd();
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AddEntryPoint(spv::ExecutionModel::Vertex, main_func, "main", in_pos, per_vertex);
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}
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};
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int main(int argc, char** argv) {
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MyModule module;
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module.Generate();
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std::vector<std::uint32_t> code{module.Assemble()};
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FILE* file = fopen("sirit.spv", "wb");
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fwrite(code.data(), sizeof(std::uint32_t), code.size(), file);
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fclose(file);
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return 0;
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}
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