gl_shader_decompiler: Use variable AOFFI on supported hardware

src/video_core/renderer_opengl/gl_device.cpp

@@ -5,6 +5,7 @@
 #include <cstddef>
 #include <glad/glad.h>
 
+#include "common/logging/log.h"
 #include "video_core/renderer_opengl/gl_device.h"
 
 namespace OpenGL {
@@ -18,10 +19,27 @@ T GetInteger(GLenum pname) {
 }
 } // Anonymous namespace
 
-Device::Device() = default;
-
-void Device::Initialize() {
+Device::Device() {
     uniform_buffer_alignment = GetInteger<std::size_t>(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT);
+    has_variable_aoffi = TestVariableAoffi();
+}
+
+bool Device::TestVariableAoffi() {
+    const GLchar* AOFFI_TEST = R"(#version 430 core
+uniform sampler2D tex;
+uniform ivec2 variable_offset;
+void main() {
+    gl_Position = textureOffset(tex, vec2(0), variable_offset);
+}
+)";
+    const GLuint shader{glCreateShaderProgramv(GL_VERTEX_SHADER, 1, &AOFFI_TEST)};
+    GLint link_status{};
+    glGetProgramiv(shader, GL_LINK_STATUS, &link_status);
+    glDeleteProgram(shader);
+
+    const bool supported{link_status == GL_TRUE};
+    LOG_INFO(Render_OpenGL, "Renderer_VariableAOFFI: {}", supported);
+    return supported;
 }
 
 } // namespace OpenGL

src/video_core/renderer_opengl/gl_device.h

@@ -12,14 +12,19 @@ class Device {
 public:
     Device();
 
-    void Initialize();
-
     std::size_t GetUniformBufferAlignment() const {
         return uniform_buffer_alignment;
     }
 
+    bool HasVariableAoffi() const {
+        return has_variable_aoffi;
+    }
+
 private:
+    static bool TestVariableAoffi();
+
     std::size_t uniform_buffer_alignment{};
+    bool has_variable_aoffi{};
 };
 
 } // namespace OpenGL

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -99,7 +99,7 @@ struct FramebufferCacheKey {
 };
 
 RasterizerOpenGL::RasterizerOpenGL(Core::System& system, ScreenInfo& info)
-    : res_cache{*this}, shader_cache{*this, system}, global_cache{*this}, system{system},
+    : res_cache{*this}, shader_cache{*this, system, device}, global_cache{*this}, system{system},
       screen_info{info}, buffer_cache(*this, STREAM_BUFFER_SIZE) {
     // Create sampler objects
     for (std::size_t i = 0; i < texture_samplers.size(); ++i) {
@@ -107,8 +107,6 @@ RasterizerOpenGL::RasterizerOpenGL(Core::System& system, ScreenInfo& info)
         state.texture_units[i].sampler = texture_samplers[i].sampler.handle;
     }
 
-    device.Initialize();
-
     OpenGLState::ApplyDefaultState();
 
     shader_program_manager = std::make_unique<GLShader::ProgramManager>();

src/video_core/renderer_opengl/gl_rasterizer.h

@@ -204,6 +204,7 @@ private:
     /// but are needed for correct emulation
     void CheckExtensions();
 
+    const Device device;
     OpenGLState state;
 
     RasterizerCacheOpenGL res_cache;
@@ -211,11 +212,8 @@ private:
     GlobalRegionCacheOpenGL global_cache;
 
     Core::System& system;
-
     ScreenInfo& screen_info;
 
-    Device device;
-
     std::unique_ptr<GLShader::ProgramManager> shader_program_manager;
     std::map<std::array<Tegra::Engines::Maxwell3D::Regs::VertexAttribute,
                         Tegra::Engines::Maxwell3D::Regs::NumVertexAttributes>,

src/video_core/renderer_opengl/gl_shader_cache.cpp

@@ -134,8 +134,8 @@ u64 GetUniqueIdentifier(Maxwell::ShaderProgram program_type, const ProgramCode&
 }
 
 /// Creates an unspecialized program from code streams
-GLShader::ProgramResult CreateProgram(Maxwell::ShaderProgram program_type, ProgramCode program_code,
-                                      ProgramCode program_code_b) {
+GLShader::ProgramResult CreateProgram(const Device& device, Maxwell::ShaderProgram program_type,
+                                      ProgramCode program_code, ProgramCode program_code_b) {
     GLShader::ShaderSetup setup(program_code);
     if (program_type == Maxwell::ShaderProgram::VertexA) {
         // VertexB is always enabled, so when VertexA is enabled, we have two vertex shaders.
@@ -149,11 +149,11 @@ GLShader::ProgramResult CreateProgram(Maxwell::ShaderProgram program_type, Progr
     switch (program_type) {
     case Maxwell::ShaderProgram::VertexA:
     case Maxwell::ShaderProgram::VertexB:
-        return GLShader::GenerateVertexShader(setup);
+        return GLShader::GenerateVertexShader(device, setup);
     case Maxwell::ShaderProgram::Geometry:
-        return GLShader::GenerateGeometryShader(setup);
+        return GLShader::GenerateGeometryShader(device, setup);
     case Maxwell::ShaderProgram::Fragment:
-        return GLShader::GenerateFragmentShader(setup);
+        return GLShader::GenerateFragmentShader(device, setup);
     default:
         LOG_CRITICAL(HW_GPU, "Unimplemented program_type={}", static_cast<u32>(program_type));
         UNREACHABLE();
@@ -212,22 +212,20 @@ std::set<GLenum> GetSupportedFormats() {
     return supported_formats;
 }
 
-} // namespace
+} // Anonymous namespace
 
-CachedShader::CachedShader(VAddr cpu_addr, u64 unique_identifier,
+CachedShader::CachedShader(const Device& device, VAddr cpu_addr, u64 unique_identifier,
                            Maxwell::ShaderProgram program_type, ShaderDiskCacheOpenGL& disk_cache,
                            const PrecompiledPrograms& precompiled_programs,
                            ProgramCode&& program_code, ProgramCode&& program_code_b, u8* host_ptr)
     : RasterizerCacheObject{host_ptr}, host_ptr{host_ptr}, cpu_addr{cpu_addr},
       unique_identifier{unique_identifier}, program_type{program_type}, disk_cache{disk_cache},
       precompiled_programs{precompiled_programs} {
-
-    const std::size_t code_size = CalculateProgramSize(program_code);
-    const std::size_t code_size_b =
-        program_code_b.empty() ? 0 : CalculateProgramSize(program_code_b);
-
-    GLShader::ProgramResult program_result =
-        CreateProgram(program_type, program_code, program_code_b);
+    const std::size_t code_size{CalculateProgramSize(program_code)};
+    const std::size_t code_size_b{program_code_b.empty() ? 0
+                                                         : CalculateProgramSize(program_code_b)};
+    GLShader::ProgramResult program_result{
+        CreateProgram(device, program_type, program_code, program_code_b)};
     if (program_result.first.empty()) {
         // TODO(Rodrigo): Unimplemented shader stages hit here, avoid using these for now
         return;
@@ -251,7 +249,6 @@ CachedShader::CachedShader(VAddr cpu_addr, u64 unique_identifier,
     : RasterizerCacheObject{host_ptr}, cpu_addr{cpu_addr}, unique_identifier{unique_identifier},
       program_type{program_type}, disk_cache{disk_cache}, precompiled_programs{
                                                               precompiled_programs} {
-
     code = std::move(result.first);
     entries = result.second;
     shader_length = entries.shader_length;
@@ -344,8 +341,9 @@ ShaderDiskCacheUsage CachedShader::GetUsage(GLenum primitive_mode,
     return {unique_identifier, base_bindings, primitive_mode};
 }
 
-ShaderCacheOpenGL::ShaderCacheOpenGL(RasterizerOpenGL& rasterizer, Core::System& system)
-    : RasterizerCache{rasterizer}, disk_cache{system} {}
+ShaderCacheOpenGL::ShaderCacheOpenGL(RasterizerOpenGL& rasterizer, Core::System& system,
+                                     const Device& device)
+    : RasterizerCache{rasterizer}, disk_cache{system}, device{device} {}
 
 void ShaderCacheOpenGL::LoadDiskCache(const std::atomic_bool& stop_loading,
                                       const VideoCore::DiskResourceLoadCallback& callback) {
@@ -439,17 +437,18 @@ std::unordered_map<u64, UnspecializedShader> ShaderCacheOpenGL::GenerateUnspecia
     const std::unordered_map<u64, ShaderDiskCacheDecompiled>& decompiled) {
     std::unordered_map<u64, UnspecializedShader> unspecialized;
 
-    if (callback)
+    if (callback) {
         callback(VideoCore::LoadCallbackStage::Decompile, 0, raws.size());
+    }
 
     for (std::size_t i = 0; i < raws.size(); ++i) {
-        if (stop_loading)
+        if (stop_loading) {
             return {};
-
+        }
         const auto& raw{raws[i]};
-        const u64 unique_identifier = raw.GetUniqueIdentifier();
-        const u64 calculated_hash =
-            GetUniqueIdentifier(raw.GetProgramType(), raw.GetProgramCode(), raw.GetProgramCodeB());
+        const u64 unique_identifier{raw.GetUniqueIdentifier()};
+        const u64 calculated_hash{
+            GetUniqueIdentifier(raw.GetProgramType(), raw.GetProgramCode(), raw.GetProgramCodeB())};
         if (unique_identifier != calculated_hash) {
             LOG_ERROR(
                 Render_OpenGL,
@@ -466,8 +465,8 @@ std::unordered_map<u64, UnspecializedShader> ShaderCacheOpenGL::GenerateUnspecia
             result = {stored_decompiled.code, stored_decompiled.entries};
         } else {
             // Otherwise decompile the shader at boot and save the result to the decompiled file
-            result =
-                CreateProgram(raw.GetProgramType(), raw.GetProgramCode(), raw.GetProgramCodeB());
+            result = CreateProgram(device, raw.GetProgramType(), raw.GetProgramCode(),
+                                   raw.GetProgramCodeB());
             disk_cache.SaveDecompiled(unique_identifier, result.first, result.second);
         }
 
@@ -477,8 +476,9 @@ std::unordered_map<u64, UnspecializedShader> ShaderCacheOpenGL::GenerateUnspecia
             {raw.GetUniqueIdentifier(),
              {std::move(result.first), std::move(result.second), raw.GetProgramType()}});
 
-        if (callback)
+        if (callback) {
             callback(VideoCore::LoadCallbackStage::Decompile, i, raws.size());
+        }
     }
     return unspecialized;
 }
@@ -512,7 +512,7 @@ Shader ShaderCacheOpenGL::GetStageProgram(Maxwell::ShaderProgram program) {
                                                precompiled_programs, found->second, host_ptr);
         } else {
             shader = std::make_shared<CachedShader>(
-                cpu_addr, unique_identifier, program, disk_cache, precompiled_programs,
+                device, cpu_addr, unique_identifier, program, disk_cache, precompiled_programs,
                 std::move(program_code), std::move(program_code_b), host_ptr);
         }
         Register(shader);

src/video_core/renderer_opengl/gl_shader_cache.h

@@ -27,6 +27,7 @@ class System;
 namespace OpenGL {
 
 class CachedShader;
+class Device;
 class RasterizerOpenGL;
 struct UnspecializedShader;
 
@@ -38,7 +39,7 @@ using PrecompiledShaders = std::unordered_map<u64, GLShader::ProgramResult>;
 
 class CachedShader final : public RasterizerCacheObject {
 public:
-    explicit CachedShader(VAddr cpu_addr, u64 unique_identifier,
+    explicit CachedShader(const Device& device, VAddr cpu_addr, u64 unique_identifier,
                           Maxwell::ShaderProgram program_type, ShaderDiskCacheOpenGL& disk_cache,
                           const PrecompiledPrograms& precompiled_programs,
                           ProgramCode&& program_code, ProgramCode&& program_code_b, u8* host_ptr);
@@ -112,7 +113,8 @@ private:
 
 class ShaderCacheOpenGL final : public RasterizerCache<Shader> {
 public:
-    explicit ShaderCacheOpenGL(RasterizerOpenGL& rasterizer, Core::System& system);
+    explicit ShaderCacheOpenGL(RasterizerOpenGL& rasterizer, Core::System& system,
+                               const Device& device);
 
     /// Loads disk cache for the current game
     void LoadDiskCache(const std::atomic_bool& stop_loading,
@@ -130,6 +132,8 @@ private:
     CachedProgram GeneratePrecompiledProgram(const ShaderDiskCacheDump& dump,
                                              const std::set<GLenum>& supported_formats);
 
+    const Device& device;
+
     std::array<Shader, Maxwell::MaxShaderProgram> last_shaders;
 
     ShaderDiskCacheOpenGL disk_cache;

src/video_core/renderer_opengl/gl_shader_decompiler.cpp

@@ -15,6 +15,7 @@
 #include "common/assert.h"
 #include "common/common_types.h"
 #include "video_core/engines/maxwell_3d.h"
+#include "video_core/renderer_opengl/gl_device.h"
 #include "video_core/renderer_opengl/gl_rasterizer.h"
 #include "video_core/renderer_opengl/gl_shader_decompiler.h"
 #include "video_core/shader/shader_ir.h"
@@ -141,8 +142,9 @@ bool IsPrecise(Node node) {
 
 class GLSLDecompiler final {
 public:
-    explicit GLSLDecompiler(const ShaderIR& ir, ShaderStage stage, std::string suffix)
-        : ir{ir}, stage{stage}, suffix{suffix}, header{ir.GetHeader()} {}
+    explicit GLSLDecompiler(const Device& device, const ShaderIR& ir, ShaderStage stage,
+                            std::string suffix)
+        : device{device}, ir{ir}, stage{stage}, suffix{suffix}, header{ir.GetHeader()} {}
 
     void Decompile() {
         DeclareVertex();
@@ -819,8 +821,12 @@ private:
                 // Inline the string as an immediate integer in GLSL (AOFFI arguments are required
                 // to be constant by the standard).
                 expr += std::to_string(static_cast<s32>(immediate->GetValue()));
-            } else {
+            } else if (device.HasVariableAoffi()) {
+                // Avoid using variable AOFFI on unsupported devices.
                 expr += "ftoi(" + Visit(operand) + ')';
+            } else {
+                // Insert 0 on devices not supporting variable AOFFI.
+                expr += '0';
             }
             if (index + 1 < aoffi.size()) {
                 expr += ", ";
@@ -1609,6 +1615,7 @@ private:
         return name + '_' + std::to_string(index) + '_' + suffix;
     }
 
+    const Device& device;
     const ShaderIR& ir;
     const ShaderStage stage;
     const std::string suffix;
@@ -1636,8 +1643,9 @@ std::string GetCommonDeclarations() {
            "}\n";
 }
 
-ProgramResult Decompile(const ShaderIR& ir, Maxwell::ShaderStage stage, const std::string& suffix) {
-    GLSLDecompiler decompiler(ir, stage, suffix);
+ProgramResult Decompile(const Device& device, const ShaderIR& ir, Maxwell::ShaderStage stage,
+                        const std::string& suffix) {
+    GLSLDecompiler decompiler(device, ir, stage, suffix);
     decompiler.Decompile();
     return {decompiler.GetResult(), decompiler.GetShaderEntries()};
 }

src/video_core/renderer_opengl/gl_shader_decompiler.h

@@ -12,6 +12,10 @@
 #include "video_core/engines/maxwell_3d.h"
 #include "video_core/shader/shader_ir.h"
 
+namespace OpenGL {
+class Device;
+}
+
 namespace VideoCommon::Shader {
 class ShaderIR;
 }
@@ -65,7 +69,7 @@ struct ShaderEntries {
 
 std::string GetCommonDeclarations();
 
-ProgramResult Decompile(const VideoCommon::Shader::ShaderIR& ir, Maxwell::ShaderStage stage,
-                        const std::string& suffix);
+ProgramResult Decompile(const Device& device, const VideoCommon::Shader::ShaderIR& ir,
+                        Maxwell::ShaderStage stage, const std::string& suffix);
 
 } // namespace OpenGL::GLShader

src/video_core/renderer_opengl/gl_shader_gen.cpp

@@ -16,7 +16,7 @@ using VideoCommon::Shader::ShaderIR;
 
 static constexpr u32 PROGRAM_OFFSET{10};
 
-ProgramResult GenerateVertexShader(const ShaderSetup& setup) {
+ProgramResult GenerateVertexShader(const Device& device, const ShaderSetup& setup) {
     const std::string id = fmt::format("{:016x}", setup.program.unique_identifier);
 
     std::string out = "#extension GL_ARB_separate_shader_objects : enable\n\n";
@@ -34,14 +34,15 @@ layout (std140, binding = EMULATION_UBO_BINDING) uniform vs_config {
 
 )";
     ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET);
-    ProgramResult program = Decompile(program_ir, Maxwell3D::Regs::ShaderStage::Vertex, "vertex");
+    ProgramResult program =
+        Decompile(device, program_ir, Maxwell3D::Regs::ShaderStage::Vertex, "vertex");
 
     out += program.first;
 
     if (setup.IsDualProgram()) {
         ShaderIR program_ir_b(setup.program.code_b, PROGRAM_OFFSET);
         ProgramResult program_b =
-            Decompile(program_ir_b, Maxwell3D::Regs::ShaderStage::Vertex, "vertex_b");
+            Decompile(device, program_ir_b, Maxwell3D::Regs::ShaderStage::Vertex, "vertex_b");
 
         out += program_b.first;
     }
@@ -75,7 +76,7 @@ void main() {
     return {out, program.second};
 }
 
-ProgramResult GenerateGeometryShader(const ShaderSetup& setup) {
+ProgramResult GenerateGeometryShader(const Device& device, const ShaderSetup& setup) {
     const std::string id = fmt::format("{:016x}", setup.program.unique_identifier);
 
     std::string out = "#extension GL_ARB_separate_shader_objects : enable\n\n";
@@ -95,7 +96,7 @@ layout (std140, binding = EMULATION_UBO_BINDING) uniform gs_config {
 )";
     ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET);
     ProgramResult program =
-        Decompile(program_ir, Maxwell3D::Regs::ShaderStage::Geometry, "geometry");
+        Decompile(device, program_ir, Maxwell3D::Regs::ShaderStage::Geometry, "geometry");
     out += program.first;
 
     out += R"(
@@ -106,7 +107,7 @@ void main() {
     return {out, program.second};
 }
 
-ProgramResult GenerateFragmentShader(const ShaderSetup& setup) {
+ProgramResult GenerateFragmentShader(const Device& device, const ShaderSetup& setup) {
     const std::string id = fmt::format("{:016x}", setup.program.unique_identifier);
 
     std::string out = "#extension GL_ARB_separate_shader_objects : enable\n\n";
@@ -158,7 +159,7 @@ bool AlphaFunc(in float value) {
 )";
     ShaderIR program_ir(setup.program.code, PROGRAM_OFFSET);
     ProgramResult program =
-        Decompile(program_ir, Maxwell3D::Regs::ShaderStage::Fragment, "fragment");
+        Decompile(device, program_ir, Maxwell3D::Regs::ShaderStage::Fragment, "fragment");
 
     out += program.first;
 

src/video_core/renderer_opengl/gl_shader_gen.h

@@ -10,6 +10,10 @@
 #include "video_core/renderer_opengl/gl_shader_decompiler.h"
 #include "video_core/shader/shader_ir.h"
 
+namespace OpenGL {
+class Device;
+}
+
 namespace OpenGL::GLShader {
 
 using VideoCommon::Shader::ProgramCode;
@@ -39,22 +43,13 @@ private:
     bool has_program_b{};
 };
 
-/**
- * Generates the GLSL vertex shader program source code for the given VS program
- * @returns String of the shader source code
- */
-ProgramResult GenerateVertexShader(const ShaderSetup& setup);
-
-/**
- * Generates the GLSL geometry shader program source code for the given GS program
- * @returns String of the shader source code
- */
-ProgramResult GenerateGeometryShader(const ShaderSetup& setup);
-
-/**
- * Generates the GLSL fragment shader program source code for the given FS program
- * @returns String of the shader source code
- */
-ProgramResult GenerateFragmentShader(const ShaderSetup& setup);
+/// Generates the GLSL vertex shader program source code for the given VS program
+ProgramResult GenerateVertexShader(const Device& device, const ShaderSetup& setup);
+
+/// Generates the GLSL geometry shader program source code for the given GS program
+ProgramResult GenerateGeometryShader(const Device& device, const ShaderSetup& setup);
+
+/// Generates the GLSL fragment shader program source code for the given FS program
+ProgramResult GenerateFragmentShader(const Device& device, const ShaderSetup& setup);
 
 } // namespace OpenGL::GLShader