[D3D12] DXBC RDEF types

src/xenia/gpu/dxbc_shader_translator.h

@@ -23,6 +23,37 @@ class DxbcShaderTranslator : public ShaderTranslator {
   DxbcShaderTranslator();
   ~DxbcShaderTranslator() override;
 
+  struct SystemConstants {
+    // vec4 0
+    float mul_rcp_w[3];
+    uint32_t vertex_base_index;
+
+    // vec4 1
+    float ndc_scale[3];
+    uint32_t vertex_index_endian;
+
+    // vec4 2
+    float ndc_offset[3];
+    float pixel_half_pixel_offset;
+
+    // vec4 3
+    float point_size[2];
+    float ssaa_inv_scale[2];
+
+    // vec3 4
+    uint32_t pixel_pos_reg;
+    // 0 - disabled, 1 - passes if in range, -1 - fails if in range.
+    int32_t alpha_test;
+    // The range is floats as uints so it's easier to pass infinity.
+    uint32_t alpha_test_range[2];
+
+    // vec4 5
+    float color_exp_bias[4];
+
+    // vec4 6
+    uint32_t color_output_map[4];
+  };
+
  protected:
   void Reset() override;
 
@@ -39,6 +70,112 @@ class DxbcShaderTranslator : public ShaderTranslator {
   // Complete shader object, with all the needed chunks and dcl_ instructions -
   // generated in the end of translation.
   std::vector<uint32_t> shader_object_;
+
+  // Data types used in constants buffers. Listed in dependency order.
+  enum class RdefTypeIndex {
+    kFloat,
+    kFloat2,
+    kFloat3,
+    kFloat4,
+    kInt,
+    kUint,
+    kUint4,
+    // Float constants in one page.
+    kFloat4Array32,
+    // Bool constants.
+    kUint4Array8,
+    // Loop constants.
+    kUint4Array32,
+    // Fetch constants.
+    kUint4Array48,
+    kFloatConstantPageStruct,
+
+    kCount,
+    kUnknown = kCount
+  };
+
+  struct RdefStructMember {
+    const char* name;
+    RdefTypeIndex type;
+    uint32_t offset;
+  };
+  static const RdefStructMember rdef_float_constant_page_member_;
+
+  struct RdefType {
+    // Name ignored for arrays.
+    const char* name;
+    // D3D10_SHADER_VARIABLE_CLASS.
+    uint32_t type_class;
+    // D3D10_SHADER_VARIABLE_TYPE.
+    uint32_t type;
+    uint32_t row_count;
+    uint32_t column_count;
+    // 0 for primitive types, 1 for structures, array size for arrays.
+    uint32_t element_count;
+    uint32_t struct_member_count;
+    RdefTypeIndex array_element_type;
+    const RdefStructMember* struct_members;
+  };
+  static const RdefType rdef_types_[size_t(RdefTypeIndex::kCount)];
+
+  enum class RdefConstantIndex {
+    kSystemConstantFirst,
+    kSysMulRcpW = kSystemConstantFirst,
+    kSysVertexBaseIndex,
+    kSysNDCScale,
+    kSysVertexIndexEndian,
+    kSysNDCOffset,
+    kSysPixelHalfPixelOffset,
+    kSysPointSize,
+    kSysSSAAInvScale,
+    kSysPixelPosReg,
+    kSysAlphaTest,
+    kSysAlphaTestRange,
+    kSysColorExpBias,
+    kSysColorOutputMap,
+    kSystemConstantLast = kSysColorOutputMap,
+
+    kBoolConstants,
+    kLoopConstants,
+
+    kFetchConstants,
+
+    kFloatConstants,
+
+    kCount,
+    kSystemConstantCount = kSystemConstantLast - kSystemConstantFirst + 1,
+  };
+  struct RdefConstant {
+    const char* name;
+    RdefTypeIndex type;
+    uint32_t offset;
+    uint32_t size;
+  };
+  static const RdefConstant rdef_constants_[size_t(RdefConstantIndex::kCount)];
+  static_assert(uint32_t(RdefConstantIndex::kCount) <= 64,
+                "Too many constants in all constant buffers - can't use a 64 "
+                "bit vector to store which constants are used");
+  uint64_t rdef_constants_used_;
+
+  enum class RdefConstantBufferIndex {
+    kSystemConstants,
+    kBoolLoopConstants,
+    kFetchConstants,
+    kFloatConstants,
+
+    kCount
+  };
+  struct RdefConstantBuffer {
+    const char* name;
+    RdefConstantIndex first_constant;
+    uint32_t constant_count;
+    uint32_t size;
+    uint32_t register_index;
+    uint32_t binding_count;
+    bool dynamic_indexed;
+  };
+  static const RdefConstantBuffer
+      rdef_constant_buffers[size_t(RdefConstantBufferIndex::kCount)];
 };
 
 }  // namespace gpu