From 725ba6cf6336fb0f1be4e5250c15767d60e28259 Mon Sep 17 00:00:00 2001
From: ReinUsesLisp <reinuseslisp@airmail.cc>
Date: Sun, 14 Jul 2019 22:25:13 -0300
Subject: gl_rasterizer: Implement compute shaders

---
 src/video_core/renderer_opengl/gl_shader_gen.cpp | 38 +++++++++++++++++-------
 1 file changed, 27 insertions(+), 11 deletions(-)

(limited to 'src/video_core/renderer_opengl/gl_shader_gen.cpp')

diff --git a/src/video_core/renderer_opengl/gl_shader_gen.cpp b/src/video_core/renderer_opengl/gl_shader_gen.cpp
index f9ee8429e..de72570d6 100644
--- a/src/video_core/renderer_opengl/gl_shader_gen.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_gen.cpp
@@ -14,7 +14,8 @@ using Tegra::Engines::Maxwell3D;
 using VideoCommon::Shader::ProgramCode;
 using VideoCommon::Shader::ShaderIR;
 
-static constexpr u32 PROGRAM_OFFSET{10};
+static constexpr u32 PROGRAM_OFFSET = 10;
+static constexpr u32 COMPUTE_OFFSET = 0;
 
 ProgramResult GenerateVertexShader(const Device& device, const ShaderSetup& setup) {
     const std::string id = fmt::format("{:016x}", setup.program.unique_identifier);
@@ -29,17 +30,15 @@ layout (std140, binding = EMULATION_UBO_BINDING) uniform vs_config {
 };
 
 )";
-    const ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET, setup.program.size_a);
-    ProgramResult program =
-        Decompile(device, program_ir, Maxwell3D::Regs::ShaderStage::Vertex, "vertex");
 
+    const ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET, setup.program.size_a);
+    const auto stage = setup.IsDualProgram() ? ProgramType::VertexA : ProgramType::VertexB;
+    ProgramResult program = Decompile(device, program_ir, stage, "vertex");
     out += program.first;
 
     if (setup.IsDualProgram()) {
         const ShaderIR program_ir_b(setup.program.code_b, PROGRAM_OFFSET, setup.program.size_b);
-        ProgramResult program_b =
-            Decompile(device, program_ir_b, Maxwell3D::Regs::ShaderStage::Vertex, "vertex_b");
-
+        ProgramResult program_b = Decompile(device, program_ir_b, ProgramType::VertexB, "vertex_b");
         out += program_b.first;
     }
 
@@ -80,9 +79,10 @@ layout (std140, binding = EMULATION_UBO_BINDING) uniform gs_config {
 };
 
 )";
+
     const ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET, setup.program.size_a);
     ProgramResult program =
-        Decompile(device, program_ir, Maxwell3D::Regs::ShaderStage::Geometry, "geometry");
+        Decompile(device, program_ir, ProgramType::Geometry, "geometry");
     out += program.first;
 
     out += R"(
@@ -116,9 +116,7 @@ layout (std140, binding = EMULATION_UBO_BINDING) uniform fs_config {
 
 )";
     const ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET, setup.program.size_a);
-    ProgramResult program =
-        Decompile(device, program_ir, Maxwell3D::Regs::ShaderStage::Fragment, "fragment");
-
+    ProgramResult program = Decompile(device, program_ir, ProgramType::Fragment, "fragment");
     out += program.first;
 
     out += R"(
@@ -130,4 +128,22 @@ void main() {
     return {std::move(out), std::move(program.second)};
 }
 
+ProgramResult GenerateComputeShader(const Device& device, const ShaderSetup& setup) {
+    const std::string id = fmt::format("{:016x}", setup.program.unique_identifier);
+
+    std::string out = "// Shader Unique Id: CS" + id + "\n\n";
+    out += GetCommonDeclarations();
+
+    const ShaderIR program_ir(setup.program.code, COMPUTE_OFFSET, setup.program.size_a);
+    ProgramResult program = Decompile(device, program_ir, ProgramType::Compute, "compute");
+    out += program.first;
+
+    out += R"(
+void main() {
+    execute_compute();
+}
+)";
+    return {std::move(out), std::move(program.second)};
+}
+
 } // namespace OpenGL::GLShader
-- 
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