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/* This file is part of the sirit project.
* Copyright (c) 2018 ReinUsesLisp
* This software may be used and distributed according to the terms of the GNU
* Lesser General Public License version 3 or any later version.
*/
#include <cstdio>
#include <cstdlib>
#include <sirit/sirit.h>
using u32 = uint32_t;
class MyModule : public Sirit::Module {
public:
MyModule() = default;
~MyModule() = default;
void Generate() {
AddCapability(spv::Capability::Shader);
SetMemoryModel(spv::AddressingModel::Logical, spv::MemoryModel::GLSL450);
const auto t_void = Name(OpTypeVoid(), "void");
const auto t_uint = Name(OpTypeInt(32, false), "uint");
const auto t_float = Name(OpTypeFloat(32), "float");
const auto float4 = Name(OpTypeVector(t_float, 4), "float4");
const auto in_float = Name(OpTypePointer(spv::StorageClass::Input, t_float), "in_float");
const auto in_float4 = Name(OpTypePointer(spv::StorageClass::Input, float4), "in_float4");
const auto out_float4 =
Name(OpTypePointer(spv::StorageClass::Output, float4), "out_float4");
const auto gl_per_vertex = Name(OpTypeStruct(float4), "gl_PerVertex");
const auto gl_per_vertex_ptr =
Name(OpTypePointer(spv::StorageClass::Output, gl_per_vertex), "out_gl_PerVertex");
const auto in_pos = Name(OpVariable(in_float4, spv::StorageClass::Input), "in_pos");
const auto per_vertex =
Name(OpVariable(gl_per_vertex_ptr, spv::StorageClass::Output), "per_vertex");
Decorate(in_pos, spv::Decoration::Location, 0);
Decorate(gl_per_vertex, spv::Decoration::Block);
Decorate(gl_per_vertex, spv::Decoration::Block);
MemberDecorate(gl_per_vertex, 0, spv::Decoration::BuiltIn,
static_cast<u32>(spv::BuiltIn::Position));
AddGlobalVariable(in_pos);
AddGlobalVariable(per_vertex);
const auto main_func = Emit(
Name(OpFunction(t_void, spv::FunctionControlMask::MaskNone, OpTypeFunction(t_void)),
"main"));
Emit(OpLabel());
const auto ptr_pos_x = Emit(OpAccessChain(in_float, in_pos, Constant(t_uint, 0u)));
const auto ptr_pos_y = Emit(OpAccessChain(in_float, in_pos, Constant(t_uint, 1u)));
const auto pos_x = Emit(OpLoad(t_float, ptr_pos_x));
const auto pos_y = Emit(OpLoad(t_float, ptr_pos_y));
auto tmp_position = Emit(OpUndef(float4));
Decorate(tmp_position, spv::Decoration::FPRoundingMode,
static_cast<u32>(spv::FPRoundingMode::RTE));
tmp_position = Emit(OpCompositeInsert(float4, pos_x, tmp_position, 0));
tmp_position = Emit(OpCompositeInsert(float4, pos_y, tmp_position, 1));
tmp_position = Emit(OpCompositeInsert(float4, Constant(t_float, 0.f), tmp_position, 2));
tmp_position = Emit(OpCompositeInsert(float4, Constant(t_float, 1.f), tmp_position, 3));
const auto gl_position = Emit(OpAccessChain(out_float4, per_vertex, Constant(t_uint, 0u)));
Emit(OpStore(gl_position, tmp_position));
Emit(OpReturn());
Emit(OpFunctionEnd());
AddEntryPoint(spv::ExecutionModel::Vertex, main_func, "main", in_pos, per_vertex);
}
};
int main(int argc, char** argv) {
MyModule module;
module.Generate();
std::vector<std::uint8_t> code{module.Assemble()};
FILE* file = fopen("sirit.spv", "wb");
fwrite(code.data(), 1, code.size(), file);
fclose(file);
return 0;
}
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