glsl: Squash constant buffers into a single SSBO when we hit the limit

Avoids compilation errors at the cost of shader build times and runtime
performance when a game hits the limit of uniform buffers we can use.

src/video_core/renderer_opengl/gl_device.cpp

@@ -6,6 +6,7 @@
 #include <array>
 #include <cstddef>
 #include <cstring>
+#include <limits>
 #include <optional>
 #include <vector>
 
@@ -26,24 +27,27 @@ constexpr u32 ReservedUniformBlocks = 1;
 
 constexpr u32 NumStages = 5;
 
-constexpr std::array LimitUBOs = {GL_MAX_VERTEX_UNIFORM_BLOCKS, GL_MAX_TESS_CONTROL_UNIFORM_BLOCKS,
-                                  GL_MAX_TESS_EVALUATION_UNIFORM_BLOCKS,
-                                  GL_MAX_GEOMETRY_UNIFORM_BLOCKS, GL_MAX_FRAGMENT_UNIFORM_BLOCKS};
+constexpr std::array LimitUBOs = {
+    GL_MAX_VERTEX_UNIFORM_BLOCKS,          GL_MAX_TESS_CONTROL_UNIFORM_BLOCKS,
+    GL_MAX_TESS_EVALUATION_UNIFORM_BLOCKS, GL_MAX_GEOMETRY_UNIFORM_BLOCKS,
+    GL_MAX_FRAGMENT_UNIFORM_BLOCKS,        GL_MAX_COMPUTE_UNIFORM_BLOCKS};
 
 constexpr std::array LimitSSBOs = {
-    GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS, GL_MAX_TESS_CONTROL_SHADER_STORAGE_BLOCKS,
+    GL_MAX_VERTEX_SHADER_STORAGE_BLOCKS,          GL_MAX_TESS_CONTROL_SHADER_STORAGE_BLOCKS,
     GL_MAX_TESS_EVALUATION_SHADER_STORAGE_BLOCKS, GL_MAX_GEOMETRY_SHADER_STORAGE_BLOCKS,
-    GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS};
+    GL_MAX_FRAGMENT_SHADER_STORAGE_BLOCKS,        GL_MAX_COMPUTE_SHADER_STORAGE_BLOCKS};
 
-constexpr std::array LimitSamplers = {
-    GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, GL_MAX_TESS_CONTROL_TEXTURE_IMAGE_UNITS,
-    GL_MAX_TESS_EVALUATION_TEXTURE_IMAGE_UNITS, GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS,
-    GL_MAX_TEXTURE_IMAGE_UNITS};
+constexpr std::array LimitSamplers = {GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS,
+                                      GL_MAX_TESS_CONTROL_TEXTURE_IMAGE_UNITS,
+                                      GL_MAX_TESS_EVALUATION_TEXTURE_IMAGE_UNITS,
+                                      GL_MAX_GEOMETRY_TEXTURE_IMAGE_UNITS,
+                                      GL_MAX_TEXTURE_IMAGE_UNITS,
+                                      GL_MAX_COMPUTE_TEXTURE_IMAGE_UNITS};
 
-constexpr std::array LimitImages = {GL_MAX_VERTEX_IMAGE_UNIFORMS,
-                                    GL_MAX_TESS_CONTROL_IMAGE_UNIFORMS,
-                                    GL_MAX_TESS_EVALUATION_IMAGE_UNIFORMS,
-                                    GL_MAX_GEOMETRY_IMAGE_UNIFORMS, GL_MAX_FRAGMENT_IMAGE_UNIFORMS};
+constexpr std::array LimitImages = {
+    GL_MAX_VERTEX_IMAGE_UNIFORMS,          GL_MAX_TESS_CONTROL_IMAGE_UNIFORMS,
+    GL_MAX_TESS_EVALUATION_IMAGE_UNIFORMS, GL_MAX_GEOMETRY_IMAGE_UNIFORMS,
+    GL_MAX_FRAGMENT_IMAGE_UNIFORMS,        GL_MAX_COMPUTE_IMAGE_UNIFORMS};
 
 template <typename T>
 T GetInteger(GLenum pname) {
@@ -85,6 +89,13 @@ u32 Extract(u32& base, u32& num, u32 amount, std::optional<GLenum> limit = {}) {
     return std::exchange(base, base + amount);
 }
 
+std::array<u32, Tegra::Engines::MaxShaderTypes> BuildMaxUniformBuffers() noexcept {
+    std::array<u32, Tegra::Engines::MaxShaderTypes> max;
+    std::transform(LimitUBOs.begin(), LimitUBOs.end(), max.begin(),
+                   [](GLenum pname) { return GetInteger<u32>(pname); });
+    return max;
+}
+
 std::array<Device::BaseBindings, Tegra::Engines::MaxShaderTypes> BuildBaseBindings() noexcept {
     std::array<Device::BaseBindings, Tegra::Engines::MaxShaderTypes> bindings;
 
@@ -159,7 +170,8 @@ bool IsASTCSupported() {
 
 } // Anonymous namespace
 
-Device::Device() : base_bindings{BuildBaseBindings()} {
+Device::Device()
+    : max_uniform_buffers{BuildMaxUniformBuffers()}, base_bindings{BuildBaseBindings()} {
     const std::string_view vendor = reinterpret_cast<const char*>(glGetString(GL_VENDOR));
     const auto renderer = reinterpret_cast<const char*>(glGetString(GL_RENDERER));
     const std::vector extensions = GetExtensions();
@@ -194,7 +206,9 @@ Device::Device() : base_bindings{BuildBaseBindings()} {
 }
 
 Device::Device(std::nullptr_t) {
-    uniform_buffer_alignment = 0;
+    max_uniform_buffers.fill(std::numeric_limits<u32>::max());
+    uniform_buffer_alignment = 4;
+    shader_storage_alignment = 4;
     max_vertex_attributes = 16;
     max_varyings = 15;
     has_warp_intrinsics = true;
@@ -202,8 +216,6 @@ Device::Device(std::nullptr_t) {
     has_vertex_viewport_layer = true;
     has_image_load_formatted = true;
     has_variable_aoffi = true;
-    has_component_indexing_bug = false;
-    has_precise_bug = false;
 }
 
 bool Device::TestVariableAoffi() {

src/video_core/renderer_opengl/gl_device.h

@@ -24,6 +24,10 @@ public:
     explicit Device();
     explicit Device(std::nullptr_t);
 
+    u32 GetMaxUniformBuffers(Tegra::Engines::ShaderType shader_type) const noexcept {
+        return max_uniform_buffers[static_cast<std::size_t>(shader_type)];
+    }
+
     const BaseBindings& GetBaseBindings(std::size_t stage_index) const noexcept {
         return base_bindings[stage_index];
     }
@@ -92,7 +96,8 @@ private:
     static bool TestVariableAoffi();
     static bool TestPreciseBug();
 
-    std::array<BaseBindings, Tegra::Engines::MaxShaderTypes> base_bindings;
+    std::array<u32, Tegra::Engines::MaxShaderTypes> max_uniform_buffers{};
+    std::array<BaseBindings, Tegra::Engines::MaxShaderTypes> base_bindings{};
     std::size_t uniform_buffer_alignment{};
     std::size_t shader_storage_alignment{};
     u32 max_vertex_attributes{};

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -54,6 +54,12 @@ MICROPROFILE_DEFINE(OpenGL_PrimitiveAssembly, "OpenGL", "Prim Asmbl", MP_RGB(255
 
 namespace {
 
+constexpr std::size_t NUM_CONST_BUFFERS_PER_STAGE = 18;
+constexpr std::size_t NUM_CONST_BUFFERS_BYTES_PER_STAGE =
+    NUM_CONST_BUFFERS_PER_STAGE * Maxwell::MaxConstBufferSize;
+constexpr std::size_t TOTAL_CONST_BUFFER_BYTES =
+    NUM_CONST_BUFFERS_BYTES_PER_STAGE * Maxwell::MaxShaderStage;
+
 constexpr std::size_t NumSupportedVertexAttributes = 16;
 
 template <typename Engine, typename Entry>
@@ -104,6 +110,9 @@ RasterizerOpenGL::RasterizerOpenGL(Core::System& system, Core::Frontend::EmuWind
       screen_info{info}, program_manager{program_manager}, state_tracker{state_tracker} {
     CheckExtensions();
 
+    unified_uniform_buffer.Create();
+    glNamedBufferStorage(unified_uniform_buffer.handle, TOTAL_CONST_BUFFER_BYTES, nullptr, 0);
+
     if (device.UseAssemblyShaders()) {
         glCreateBuffers(static_cast<GLsizei>(staging_cbufs.size()), staging_cbufs.data());
         for (const GLuint cbuf : staging_cbufs) {
@@ -842,34 +851,56 @@ void RasterizerOpenGL::SetupDrawConstBuffers(std::size_t stage_index, const Shad
     MICROPROFILE_SCOPE(OpenGL_UBO);
     const auto& stages = system.GPU().Maxwell3D().state.shader_stages;
     const auto& shader_stage = stages[stage_index];
+    const auto& entries = shader->GetEntries();
+    const bool use_unified = entries.use_unified_uniforms;
+    const std::size_t base_unified_offset = stage_index * NUM_CONST_BUFFERS_BYTES_PER_STAGE;
 
-    u32 binding =
-        device.UseAssemblyShaders() ? 0 : device.GetBaseBindings(stage_index).uniform_buffer;
-    for (const auto& entry : shader->GetEntries().const_buffers) {
-        const auto& buffer = shader_stage.const_buffers[entry.GetIndex()];
-        SetupConstBuffer(PARAMETER_LUT[stage_index], binding++, buffer, entry);
+    const auto base_bindings = device.GetBaseBindings(stage_index);
+    u32 binding = device.UseAssemblyShaders() ? 0 : base_bindings.uniform_buffer;
+    for (const auto& entry : entries.const_buffers) {
+        const u32 index = entry.GetIndex();
+        const auto& buffer = shader_stage.const_buffers[index];
+        SetupConstBuffer(PARAMETER_LUT[stage_index], binding, buffer, entry, use_unified,
+                         base_unified_offset + index * Maxwell::MaxConstBufferSize);
+        ++binding;
+    }
+    if (use_unified) {
+        const u32 index = static_cast<u32>(base_bindings.shader_storage_buffer +
+                                           entries.global_memory_entries.size());
+        glBindBufferRange(GL_SHADER_STORAGE_BUFFER, index, unified_uniform_buffer.handle,
+                          base_unified_offset, NUM_CONST_BUFFERS_BYTES_PER_STAGE);
     }
 }
 
 void RasterizerOpenGL::SetupComputeConstBuffers(const Shader& kernel) {
     MICROPROFILE_SCOPE(OpenGL_UBO);
     const auto& launch_desc = system.GPU().KeplerCompute().launch_description;
+    const auto& entries = kernel->GetEntries();
+    const bool use_unified = entries.use_unified_uniforms;
 
     u32 binding = 0;
-    for (const auto& entry : kernel->GetEntries().const_buffers) {
+    for (const auto& entry : entries.const_buffers) {
         const auto& config = launch_desc.const_buffer_config[entry.GetIndex()];
         const std::bitset<8> mask = launch_desc.const_buffer_enable_mask.Value();
         Tegra::Engines::ConstBufferInfo buffer;
         buffer.address = config.Address();
         buffer.size = config.size;
         buffer.enabled = mask[entry.GetIndex()];
-        SetupConstBuffer(GL_COMPUTE_PROGRAM_PARAMETER_BUFFER_NV, binding++, buffer, entry);
+        SetupConstBuffer(GL_COMPUTE_PROGRAM_PARAMETER_BUFFER_NV, binding, buffer, entry,
+                         use_unified, entry.GetIndex() * Maxwell::MaxConstBufferSize);
+        ++binding;
+    }
+    if (use_unified) {
+        const GLuint index = static_cast<GLuint>(entries.global_memory_entries.size());
+        glBindBufferRange(GL_SHADER_STORAGE_BUFFER, index, unified_uniform_buffer.handle, 0,
+                          NUM_CONST_BUFFERS_BYTES_PER_STAGE);
     }
 }
 
 void RasterizerOpenGL::SetupConstBuffer(GLenum stage, u32 binding,
                                         const Tegra::Engines::ConstBufferInfo& buffer,
-                                        const ConstBufferEntry& entry) {
+                                        const ConstBufferEntry& entry, bool use_unified,
+                                        std::size_t unified_offset) {
     if (!buffer.enabled) {
         // Set values to zero to unbind buffers
         if (device.UseAssemblyShaders()) {
@@ -885,20 +916,29 @@ void RasterizerOpenGL::SetupConstBuffer(GLenum stage, u32 binding,
     // UBO alignment requirements.
     const std::size_t size = Common::AlignUp(GetConstBufferSize(buffer, entry), sizeof(GLvec4));
 
-    const auto alignment = device.GetUniformBufferAlignment();
-    auto [cbuf, offset] = buffer_cache.UploadMemory(buffer.address, size, alignment, false,
-                                                    device.HasFastBufferSubData());
-    if (!device.UseAssemblyShaders()) {
-        glBindBufferRange(GL_UNIFORM_BUFFER, binding, cbuf, offset, size);
+    const bool fast_upload = !use_unified && device.HasFastBufferSubData();
+
+    const std::size_t alignment = use_unified ? 4 : device.GetUniformBufferAlignment();
+    const GPUVAddr gpu_addr = buffer.address;
+    auto [cbuf, offset] = buffer_cache.UploadMemory(gpu_addr, size, alignment, false, fast_upload);
+
+    if (device.UseAssemblyShaders()) {
+        UNIMPLEMENTED_IF(use_unified);
+        if (offset != 0) {
+            const GLuint staging_cbuf = staging_cbufs[current_cbuf++];
+            glCopyNamedBufferSubData(cbuf, staging_cbuf, offset, 0, size);
+            cbuf = staging_cbuf;
+            offset = 0;
+        }
+        glBindBufferRangeNV(stage, binding, cbuf, offset, size);
         return;
     }
-    if (offset != 0) {
-        const GLuint staging_cbuf = staging_cbufs[current_cbuf++];
-        glCopyNamedBufferSubData(cbuf, staging_cbuf, offset, 0, size);
-        cbuf = staging_cbuf;
-        offset = 0;
+
+    if (use_unified) {
+        glCopyNamedBufferSubData(cbuf, unified_uniform_buffer.handle, offset, unified_offset, size);
+    } else {
+        glBindBufferRange(GL_UNIFORM_BUFFER, binding, cbuf, offset, size);
     }
-    glBindBufferRangeNV(stage, binding, cbuf, offset, size);
 }
 
 void RasterizerOpenGL::SetupDrawGlobalMemory(std::size_t stage_index, const Shader& shader) {

src/video_core/renderer_opengl/gl_rasterizer.h

@@ -107,7 +107,8 @@ private:
 
     /// Configures a constant buffer.
     void SetupConstBuffer(GLenum stage, u32 binding, const Tegra::Engines::ConstBufferInfo& buffer,
-                          const ConstBufferEntry& entry);
+                          const ConstBufferEntry& entry, bool use_unified,
+                          std::size_t unified_offset);
 
     /// Configures the current global memory entries to use for the draw command.
     void SetupDrawGlobalMemory(std::size_t stage_index, const Shader& shader);
@@ -253,6 +254,7 @@ private:
         Tegra::Engines::Maxwell3D::Regs::MaxShaderProgram;
     std::array<GLuint, NUM_CONSTANT_BUFFERS> staging_cbufs{};
     std::size_t current_cbuf = 0;
+    OGLBuffer unified_uniform_buffer;
 
     /// Number of commands queued to the OpenGL driver. Reseted on flush.
     std::size_t num_queued_commands = 0;

src/video_core/renderer_opengl/gl_shader_cache.cpp

@@ -241,8 +241,9 @@ Shader CachedShader::CreateStageFromMemory(const ShaderParameters& params,
     entry.bindless_samplers = registry->GetBindlessSamplers();
     params.disk_cache.SaveEntry(std::move(entry));
 
-    return std::shared_ptr<CachedShader>(new CachedShader(
-        params.cpu_addr, size_in_bytes, std::move(registry), MakeEntries(ir), std::move(program)));
+    return std::shared_ptr<CachedShader>(
+        new CachedShader(params.cpu_addr, size_in_bytes, std::move(registry),
+                         MakeEntries(params.device, ir, shader_type), std::move(program)));
 }
 
 Shader CachedShader::CreateKernelFromMemory(const ShaderParameters& params, ProgramCode code) {
@@ -265,8 +266,9 @@ Shader CachedShader::CreateKernelFromMemory(const ShaderParameters& params, Prog
     entry.bindless_samplers = registry->GetBindlessSamplers();
     params.disk_cache.SaveEntry(std::move(entry));
 
-    return std::shared_ptr<CachedShader>(new CachedShader(
-        params.cpu_addr, size_in_bytes, std::move(registry), MakeEntries(ir), std::move(program)));
+    return std::shared_ptr<CachedShader>(
+        new CachedShader(params.cpu_addr, size_in_bytes, std::move(registry),
+                         MakeEntries(params.device, ir, ShaderType::Compute), std::move(program)));
 }
 
 Shader CachedShader::CreateFromCache(const ShaderParameters& params,
@@ -348,7 +350,7 @@ void ShaderCacheOpenGL::LoadDiskCache(const std::atomic_bool& stop_loading,
             PrecompiledShader shader;
             shader.program = std::move(program);
             shader.registry = std::move(registry);
-            shader.entries = MakeEntries(ir);
+            shader.entries = MakeEntries(device, ir, entry.type);
 
             std::scoped_lock lock{mutex};
             if (callback) {

src/video_core/renderer_opengl/gl_shader_decompiler.cpp

@@ -61,8 +61,8 @@ struct TextureDerivates {};
 using TextureArgument = std::pair<Type, Node>;
 using TextureIR = std::variant<TextureOffset, TextureDerivates, TextureArgument>;
 
-constexpr u32 MAX_CONSTBUFFER_ELEMENTS =
-    static_cast<u32>(Maxwell::MaxConstBufferSize) / (4 * sizeof(float));
+constexpr u32 MAX_CONSTBUFFER_SCALARS = static_cast<u32>(Maxwell::MaxConstBufferSize) / sizeof(u32);
+constexpr u32 MAX_CONSTBUFFER_ELEMENTS = MAX_CONSTBUFFER_SCALARS / sizeof(u32);
 
 constexpr std::string_view CommonDeclarations = R"(#define ftoi floatBitsToInt
 #define ftou floatBitsToUint
@@ -402,6 +402,13 @@ std::string FlowStackTopName(MetaStackClass stack) {
     return fmt::format("{}_flow_stack_top", GetFlowStackPrefix(stack));
 }
 
+bool UseUnifiedUniforms(const Device& device, const ShaderIR& ir, ShaderType stage) {
+    const u32 num_ubos = static_cast<u32>(ir.GetConstantBuffers().size());
+    // We waste one UBO for emulation
+    const u32 num_available_ubos = device.GetMaxUniformBuffers(stage) - 1;
+    return num_ubos > num_available_ubos;
+}
+
 struct GenericVaryingDescription {
     std::string name;
     u8 first_element = 0;
@@ -412,8 +419,9 @@ class GLSLDecompiler final {
 public:
     explicit GLSLDecompiler(const Device& device, const ShaderIR& ir, const Registry& registry,
                             ShaderType stage, std::string_view identifier, std::string_view suffix)
-        : device{device}, ir{ir}, registry{registry}, stage{stage},
-          identifier{identifier}, suffix{suffix}, header{ir.GetHeader()} {
+        : device{device}, ir{ir}, registry{registry}, stage{stage}, identifier{identifier},
+          suffix{suffix}, header{ir.GetHeader()}, use_unified_uniforms{
+                                                      UseUnifiedUniforms(device, ir, stage)} {
         if (stage != ShaderType::Compute) {
             transform_feedback = BuildTransformFeedback(registry.GetGraphicsInfo());
         }
@@ -834,12 +842,24 @@ private:
     }
 
     void DeclareConstantBuffers() {
+        if (use_unified_uniforms) {
+            const u32 binding = device.GetBaseBindings(stage).shader_storage_buffer +
+                                static_cast<u32>(ir.GetGlobalMemory().size());
+            code.AddLine("layout (std430, binding = {}) readonly buffer UnifiedUniforms {{",
+                         binding);
+            code.AddLine("    uint cbufs[];");
+            code.AddLine("}};");
+            code.AddNewLine();
+            return;
+        }
+
         u32 binding = device.GetBaseBindings(stage).uniform_buffer;
-        for (const auto& buffers : ir.GetConstantBuffers()) {
-            const auto index = buffers.first;
+        for (const auto [index, info] : ir.GetConstantBuffers()) {
+            const u32 num_elements = Common::AlignUp(info.GetSize(), 4) / 4;
+            const u32 size = info.IsIndirect() ? MAX_CONSTBUFFER_ELEMENTS : num_elements;
             code.AddLine("layout (std140, binding = {}) uniform {} {{", binding++,
                          GetConstBufferBlock(index));
-            code.AddLine("    uvec4 {}[{}];", GetConstBuffer(index), MAX_CONSTBUFFER_ELEMENTS);
+            code.AddLine("    uvec4 {}[{}];", GetConstBuffer(index), size);
             code.AddLine("}};");
             code.AddNewLine();
         }
@@ -1038,42 +1058,51 @@ private:
 
         if (const auto cbuf = std::get_if<CbufNode>(&*node)) {
             const Node offset = cbuf->GetOffset();
+            const u32 base_unified_offset = cbuf->GetIndex() * MAX_CONSTBUFFER_SCALARS;
+
             if (const auto immediate = std::get_if<ImmediateNode>(&*offset)) {
                 // Direct access
                 const u32 offset_imm = immediate->GetValue();
                 ASSERT_MSG(offset_imm % 4 == 0, "Unaligned cbuf direct access");
-                return {fmt::format("{}[{}][{}]", GetConstBuffer(cbuf->GetIndex()),
-                                    offset_imm / (4 * 4), (offset_imm / 4) % 4),
+                if (use_unified_uniforms) {
+                    return {fmt::format("cbufs[{}]", base_unified_offset + offset_imm / 4),
+                            Type::Uint};
+                } else {
+                    return {fmt::format("{}[{}][{}]", GetConstBuffer(cbuf->GetIndex()),
+                                        offset_imm / (4 * 4), (offset_imm / 4) % 4),
+                            Type::Uint};
+                }
+            }
+
+            // Indirect access
+            if (use_unified_uniforms) {
+                return {fmt::format("cbufs[{} + ({} >> 2)]", base_unified_offset,
+                                    Visit(offset).AsUint()),
                         Type::Uint};
             }
 
-            if (std::holds_alternative<OperationNode>(*offset)) {
-                // Indirect access
-                const std::string final_offset = code.GenerateTemporary();
-                code.AddLine("uint {} = {} >> 2;", final_offset, Visit(offset).AsUint());
+            const std::string final_offset = code.GenerateTemporary();
+            code.AddLine("uint {} = {} >> 2;", final_offset, Visit(offset).AsUint());
 
-                if (!device.HasComponentIndexingBug()) {
-                    return {fmt::format("{}[{} >> 2][{} & 3]", GetConstBuffer(cbuf->GetIndex()),
-                                        final_offset, final_offset),
-                            Type::Uint};
-                }
-
-                // AMD's proprietary GLSL compiler emits ill code for variable component access.
-                // To bypass this driver bug generate 4 ifs, one per each component.
-                const std::string pack = code.GenerateTemporary();
-                code.AddLine("uvec4 {} = {}[{} >> 2];", pack, GetConstBuffer(cbuf->GetIndex()),
-                             final_offset);
-
-                const std::string result = code.GenerateTemporary();
-                code.AddLine("uint {};", result);
-                for (u32 swizzle = 0; swizzle < 4; ++swizzle) {
-                    code.AddLine("if (({} & 3) == {}) {} = {}{};", final_offset, swizzle, result,
-                                 pack, GetSwizzle(swizzle));
-                }
-                return {result, Type::Uint};
+            if (!device.HasComponentIndexingBug()) {
+                return {fmt::format("{}[{} >> 2][{} & 3]", GetConstBuffer(cbuf->GetIndex()),
+                                    final_offset, final_offset),
+                        Type::Uint};
             }
 
-            UNREACHABLE_MSG("Unmanaged offset node type");
+            // AMD's proprietary GLSL compiler emits ill code for variable component access.
+            // To bypass this driver bug generate 4 ifs, one per each component.
+            const std::string pack = code.GenerateTemporary();
+            code.AddLine("uvec4 {} = {}[{} >> 2];", pack, GetConstBuffer(cbuf->GetIndex()),
+                         final_offset);
+
+            const std::string result = code.GenerateTemporary();
+            code.AddLine("uint {};", result);
+            for (u32 swizzle = 0; swizzle < 4; ++swizzle) {
+                code.AddLine("if (({} & 3) == {}) {} = {}{};", final_offset, swizzle, result, pack,
+                             GetSwizzle(swizzle));
+            }
+            return {result, Type::Uint};
         }
 
         if (const auto gmem = std::get_if<GmemNode>(&*node)) {
@@ -2710,6 +2739,7 @@ private:
     const std::string_view identifier;
     const std::string_view suffix;
     const Header header;
+    const bool use_unified_uniforms;
     std::unordered_map<u8, VaryingTFB> transform_feedback;
 
     ShaderWriter code;
@@ -2905,7 +2935,7 @@ void GLSLDecompiler::DecompileAST() {
 
 } // Anonymous namespace
 
-ShaderEntries MakeEntries(const VideoCommon::Shader::ShaderIR& ir) {
+ShaderEntries MakeEntries(const Device& device, const ShaderIR& ir, ShaderType stage) {
     ShaderEntries entries;
     for (const auto& cbuf : ir.GetConstantBuffers()) {
         entries.const_buffers.emplace_back(cbuf.second.GetMaxOffset(), cbuf.second.IsIndirect(),
@@ -2926,6 +2956,7 @@ ShaderEntries MakeEntries(const VideoCommon::Shader::ShaderIR& ir) {
         entries.clip_distances = (clip_distances[i] ? 1U : 0U) << i;
     }
     entries.shader_length = ir.GetLength();
+    entries.use_unified_uniforms = UseUnifiedUniforms(device, ir, stage);
     return entries;
 }
 

src/video_core/renderer_opengl/gl_shader_decompiler.h

@@ -53,11 +53,13 @@ struct ShaderEntries {
     std::vector<GlobalMemoryEntry> global_memory_entries;
     std::vector<SamplerEntry> samplers;
     std::vector<ImageEntry> images;
-    u32 clip_distances{};
     std::size_t shader_length{};
+    u32 clip_distances{};
+    bool use_unified_uniforms{};
 };
 
-ShaderEntries MakeEntries(const VideoCommon::Shader::ShaderIR& ir);
+ShaderEntries MakeEntries(const Device& device, const VideoCommon::Shader::ShaderIR& ir,
+                          Tegra::Engines::ShaderType stage);
 
 std::string DecompileShader(const Device& device, const VideoCommon::Shader::ShaderIR& ir,
                             const VideoCommon::Shader::Registry& registry,