4 files changed, 110 insertions, 28 deletions

diff --git a/src/video_core/engines/shader_bytecode.h b/src/video_core/engines/shader_bytecode.h
index 4eb507325..af18c2d81 100644
--- a/src/video_core/engines/shader_bytecode.h
+++ b/src/video_core/engines/shader_bytecode.h
@@ -109,11 +109,6 @@ union Sampler {
     u64 value{};
 };
 
-union Uniform {
-    BitField<20, 14, u64> offset;
-    BitField<34, 5, u64> index;
-};
-
 } // namespace Shader
 } // namespace Tegra
 
@@ -180,6 +175,15 @@ enum class FloatRoundingOp : u64 {
     Trunc = 3,
 };
 
+enum class UniformType : u64 {
+    UnsignedByte = 0,
+    SignedByte = 1,
+    UnsignedShort = 2,
+    SignedShort = 3,
+    Single = 4,
+    Double = 5,
+};
+
 union Instruction {
     Instruction& operator=(const Instruction& instr) {
         value = instr.value;
@@ -258,6 +262,11 @@ union Instruction {
     } ffma;
 
     union {
+        BitField<48, 3, UniformType> type;
+        BitField<44, 2, u64> unknown;
+    } ld_c;
+
+    union {
         BitField<0, 3, u64> pred0;
         BitField<3, 3, u64> pred3;
         BitField<7, 1, u64> abs_a;
@@ -354,12 +363,21 @@ union Instruction {
         }
     } bra;
 
+    union {
+        BitField<20, 14, u64> offset;
+        BitField<34, 5, u64> index;
+    } cbuf34;
+
+    union {
+        BitField<20, 16, s64> offset;
+        BitField<36, 5, u64> index;
+    } cbuf36;
+
     BitField<61, 1, u64> is_b_imm;
     BitField<60, 1, u64> is_b_gpr;
     BitField<59, 1, u64> is_c_gpr;
 
     Attribute attribute;
-    Uniform uniform;
     Sampler sampler;
 
     u64 value;
@@ -374,6 +392,7 @@ public:
         KIL,
         BRA,
         LD_A,
+        LD_C,
         ST_A,
         TEX,
         TEXQ, // Texture Query
@@ -548,6 +567,7 @@ private:
             INST("111000110011----", Id::KIL, Type::Flow, "KIL"),
             INST("111000100100----", Id::BRA, Type::Flow, "BRA"),
             INST("1110111111011---", Id::LD_A, Type::Memory, "LD_A"),
+            INST("1110111110010---", Id::LD_C, Type::Memory, "LD_C"),
             INST("1110111111110---", Id::ST_A, Type::Memory, "ST_A"),
             INST("1100000000111---", Id::TEX, Type::Memory, "TEX"),
             INST("1101111101001---", Id::TEXQ, Type::Memory, "TEXQ"),
diff --git a/src/video_core/renderer_opengl/gl_rasterizer.cpp b/src/video_core/renderer_opengl/gl_rasterizer.cpp
index e9eb03ad9..b23b8fb29 100644
--- a/src/video_core/renderer_opengl/gl_rasterizer.cpp
+++ b/src/video_core/renderer_opengl/gl_rasterizer.cpp
@@ -625,7 +625,16 @@ u32 RasterizerOpenGL::SetupConstBuffers(Maxwell::ShaderStage stage, GLuint progr
         buffer_draw_state.bindpoint = current_bindpoint + bindpoint;
 
         boost::optional<VAddr> addr = gpu.memory_manager->GpuToCpuAddress(buffer.address);
-        std::vector<u8> data(used_buffer.GetSize() * sizeof(float));
+
+        std::vector<u8> data;
+        if (used_buffer.IsIndirect()) {
+            // Buffer is accessed indirectly, so upload the entire thing
+            data.resize(buffer.size * sizeof(float));
+        } else {
+            // Buffer is accessed directly, upload just what we use
+            data.resize(used_buffer.GetSize() * sizeof(float));
+        }
+
         Memory::ReadBlock(*addr, data.data(), data.size());
 
         glBindBuffer(GL_SHADER_STORAGE_BUFFER, buffer_draw_state.ssbo);
diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
index 15288bd57..3067ce3b3 100644
--- a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
+++ b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
@@ -20,7 +20,6 @@ using Tegra::Shader::OpCode;
 using Tegra::Shader::Register;
 using Tegra::Shader::Sampler;
 using Tegra::Shader::SubOp;
-using Tegra::Shader::Uniform;
 
 constexpr u32 PROGRAM_END = MAX_PROGRAM_CODE_LENGTH;
 
@@ -365,11 +364,9 @@ public:
     }
 
     /// Generates code representing a uniform (C buffer) register, interpreted as the input type.
-    std::string GetUniform(const Uniform& uniform, GLSLRegister::Type type) {
-        declr_const_buffers[uniform.index].MarkAsUsed(static_cast<unsigned>(uniform.index),
-                                                      static_cast<unsigned>(uniform.offset), stage);
-        std::string value =
-            'c' + std::to_string(uniform.index) + '[' + std::to_string(uniform.offset) + ']';
+    std::string GetUniform(u64 index, u64 offset, GLSLRegister::Type type) {
+        declr_const_buffers[index].MarkAsUsed(index, offset, stage);
+        std::string value = 'c' + std::to_string(index) + '[' + std::to_string(offset) + ']';
 
         if (type == GLSLRegister::Type::Float) {
             return value;
@@ -380,10 +377,19 @@ public:
         }
     }
 
-    /// Generates code representing a uniform (C buffer) register, interpreted as the type of the
-    /// destination register.
-    std::string GetUniform(const Uniform& uniform, const Register& dest_reg) {
-        return GetUniform(uniform, regs[dest_reg].GetActiveType());
+    std::string GetUniformIndirect(u64 index, s64 offset, const Register& index_reg,
+                                   GLSLRegister::Type type) {
+        declr_const_buffers[index].MarkAsUsedIndirect(index, stage);
+        std::string value = 'c' + std::to_string(index) + "[(floatBitsToInt(" +
+                            GetRegister(index_reg, 0) + ") + " + std::to_string(offset) + ") / 4]";
+
+        if (type == GLSLRegister::Type::Float) {
+            return value;
+        } else if (type == GLSLRegister::Type::Integer) {
+            return "floatBitsToInt(" + value + ')';
+        } else {
+            UNREACHABLE();
+        }
     }
 
     /// Add declarations for registers
@@ -778,7 +784,8 @@ private:
                 if (instr.is_b_gpr) {
                     op_b += regs.GetRegisterAsFloat(instr.gpr20);
                 } else {
-                    op_b += regs.GetUniform(instr.uniform, instr.gpr0);
+                    op_b += regs.GetUniform(instr.cbuf34.index, instr.cbuf34.offset,
+                                            GLSLRegister::Type::Float);
                 }
             }
 
@@ -935,7 +942,8 @@ private:
                 if (instr.is_b_gpr) {
                     op_b += regs.GetRegisterAsInteger(instr.gpr20);
                 } else {
-                    op_b += regs.GetUniform(instr.uniform, GLSLRegister::Type::Integer);
+                    op_b += regs.GetUniform(instr.cbuf34.index, instr.cbuf34.offset,
+                                            GLSLRegister::Type::Integer);
                 }
             }
 
@@ -967,7 +975,8 @@ private:
                 if (instr.is_b_gpr) {
                     op_b += regs.GetRegisterAsInteger(instr.gpr20);
                 } else {
-                    op_b += regs.GetUniform(instr.uniform, GLSLRegister::Type::Integer);
+                    op_b += regs.GetUniform(instr.cbuf34.index, instr.cbuf34.offset,
+                                            GLSLRegister::Type::Integer);
                 }
             }
 
@@ -984,7 +993,8 @@ private:
 
             switch (opcode->GetId()) {
             case OpCode::Id::FFMA_CR: {
-                op_b += regs.GetUniform(instr.uniform, instr.gpr0);
+                op_b += regs.GetUniform(instr.cbuf34.index, instr.cbuf34.offset,
+                                        GLSLRegister::Type::Float);
                 op_c += regs.GetRegisterAsFloat(instr.gpr39);
                 break;
             }
@@ -995,7 +1005,8 @@ private:
             }
             case OpCode::Id::FFMA_RC: {
                 op_b += regs.GetRegisterAsFloat(instr.gpr39);
-                op_c += regs.GetUniform(instr.uniform, instr.gpr0);
+                op_c += regs.GetUniform(instr.cbuf34.index, instr.cbuf34.offset,
+                                        GLSLRegister::Type::Float);
                 break;
             }
             case OpCode::Id::FFMA_IMM: {
@@ -1110,6 +1121,33 @@ private:
                                                 attribute);
                 break;
             }
+            case OpCode::Id::LD_C: {
+                ASSERT_MSG(instr.ld_c.unknown == 0, "Unimplemented");
+
+                std::string op_a =
+                    regs.GetUniformIndirect(instr.cbuf36.index, instr.cbuf36.offset + 0, instr.gpr8,
+                                            GLSLRegister::Type::Float);
+                std::string op_b =
+                    regs.GetUniformIndirect(instr.cbuf36.index, instr.cbuf36.offset + 4, instr.gpr8,
+                                            GLSLRegister::Type::Float);
+
+                switch (instr.ld_c.type.Value()) {
+                case Tegra::Shader::UniformType::Single:
+                    regs.SetRegisterToFloat(instr.gpr0, 0, op_a, 1, 1);
+                    break;
+
+                case Tegra::Shader::UniformType::Double:
+                    regs.SetRegisterToFloat(instr.gpr0, 0, op_a, 1, 1);
+                    regs.SetRegisterToFloat(instr.gpr0.Value() + 1, 0, op_b, 1, 1);
+                    break;
+
+                default:
+                    NGLOG_CRITICAL(HW_GPU, "Unhandled type: {}",
+                                   static_cast<unsigned>(instr.ld_c.type.Value()));
+                    UNREACHABLE();
+                }
+                break;
+            }
             case OpCode::Id::ST_A: {
                 ASSERT_MSG(instr.attribute.fmt20.size == 0, "untested");
                 regs.SetOutputAttributeToRegister(attribute, instr.attribute.fmt20.element,
@@ -1206,7 +1244,8 @@ private:
                 if (instr.is_b_gpr) {
                     op_b += regs.GetRegisterAsFloat(instr.gpr20);
                 } else {
-                    op_b += regs.GetUniform(instr.uniform, GLSLRegister::Type::Float);
+                    op_b += regs.GetUniform(instr.cbuf34.index, instr.cbuf34.offset,
+                                            GLSLRegister::Type::Float);
                 }
             }
 
@@ -1247,7 +1286,8 @@ private:
             if (instr.is_b_gpr) {
                 op_b += regs.GetRegisterAsInteger(instr.gpr20, 0, instr.isetp.is_signed);
             } else {
-                op_b += regs.GetUniform(instr.uniform, GLSLRegister::Type::Integer);
+                op_b += regs.GetUniform(instr.cbuf34.index, instr.cbuf34.offset,
+                                        GLSLRegister::Type::Integer);
             }
 
             using Tegra::Shader::Pred;
@@ -1293,7 +1333,8 @@ private:
                 if (instr.is_b_gpr) {
                     op_b += regs.GetRegisterAsFloat(instr.gpr20);
                 } else {
-                    op_b += regs.GetUniform(instr.uniform, GLSLRegister::Type::Float);
+                    op_b += regs.GetUniform(instr.cbuf34.index, instr.cbuf34.offset,
+                                            GLSLRegister::Type::Float);
                 }
             }
 
diff --git a/src/video_core/renderer_opengl/gl_shader_gen.h b/src/video_core/renderer_opengl/gl_shader_gen.h
index e8b78934c..ed890e0f9 100644
--- a/src/video_core/renderer_opengl/gl_shader_gen.h
+++ b/src/video_core/renderer_opengl/gl_shader_gen.h
@@ -22,17 +22,28 @@ class ConstBufferEntry {
     using Maxwell = Tegra::Engines::Maxwell3D::Regs;
 
 public:
-    void MarkAsUsed(unsigned index, unsigned offset, Maxwell::ShaderStage stage) {
+    void MarkAsUsed(u64 index, u64 offset, Maxwell::ShaderStage stage) {
         is_used = true;
-        this->index = index;
+        this->index = static_cast<unsigned>(index);
+        this->stage = stage;
+        max_offset = std::max(max_offset, static_cast<unsigned>(offset));
+    }
+
+    void MarkAsUsedIndirect(u64 index, Maxwell::ShaderStage stage) {
+        is_used = true;
+        is_indirect = true;
+        this->index = static_cast<unsigned>(index);
         this->stage = stage;
-        max_offset = std::max(max_offset, offset);
     }
 
     bool IsUsed() const {
         return is_used;
     }
 
+    bool IsIndirect() const {
+        return is_indirect;
+    }
+
     unsigned GetIndex() const {
         return index;
     }
@@ -51,6 +62,7 @@ private:
     };
 
     bool is_used{};
+    bool is_indirect{};
     unsigned index{};
     unsigned max_offset{};
     Maxwell::ShaderStage stage;