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// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/assert.h"
#include "video_core/engines/maxwell_3d.h"
#include "video_core/renderer_opengl/gl_shader_decompiler.h"
#include "video_core/renderer_opengl/gl_shader_gen.h"
namespace GLShader {
using Tegra::Engines::Maxwell3D;
static constexpr u32 PROGRAM_OFFSET{10};
ProgramResult GenerateVertexShader(const ShaderSetup& setup, const MaxwellVSConfig& config) {
std::string out = "#version 430 core\n";
out += "#extension GL_ARB_separate_shader_objects : enable\n\n";
out += Decompiler::GetCommonDeclarations();
out += "bool exec_vertex();\n";
if (setup.IsDualProgram()) {
out += "bool exec_vertex_b();\n";
}
ProgramResult program =
Decompiler::DecompileProgram(setup.program.code, PROGRAM_OFFSET,
Maxwell3D::Regs::ShaderStage::Vertex, "vertex")
.get_value_or({});
out += R"(
out gl_PerVertex {
vec4 gl_Position;
};
out vec4 position;
layout (std140) uniform vs_config {
vec4 viewport_flip;
};
void main() {
exec_vertex();
)";
if (setup.IsDualProgram()) {
out += " exec_vertex_b();";
}
out += R"(
// Viewport can be flipped, which is unsupported by glViewport
position.xy *= viewport_flip.xy;
gl_Position = position;
// TODO(bunnei): This is likely a hack, position.w should be interpolated as 1.0
// For now, this is here to bring order in lieu of proper emulation
position.w = 1.0;
}
)";
out += program.first;
if (setup.IsDualProgram()) {
ProgramResult program_b =
Decompiler::DecompileProgram(setup.program.code_b, PROGRAM_OFFSET,
Maxwell3D::Regs::ShaderStage::Vertex, "vertex_b")
.get_value_or({});
out += program_b.first;
}
return {out, program.second};
}
ProgramResult GenerateFragmentShader(const ShaderSetup& setup, const MaxwellFSConfig& config) {
std::string out = "#version 430 core\n";
out += "#extension GL_ARB_separate_shader_objects : enable\n\n";
out += Decompiler::GetCommonDeclarations();
out += "bool exec_fragment();\n";
ProgramResult program =
Decompiler::DecompileProgram(setup.program.code, PROGRAM_OFFSET,
Maxwell3D::Regs::ShaderStage::Fragment, "fragment")
.get_value_or({});
out += R"(
in vec4 position;
out vec4 color;
layout (std140) uniform fs_config {
vec4 viewport_flip;
};
void main() {
exec_fragment();
}
)";
out += program.first;
return {out, program.second};
}
} // namespace GLShader
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