[dxbc] Implemented sampler declaration

src/dxbc/dxbc_compiler.cpp

@@ -24,6 +24,9 @@ namespace dxvk {
       case DxbcOpcode::DclConstantBuffer:
         return this->dclConstantBuffer(ins);
         
+      case DxbcOpcode::DclSampler:
+        return this->dclSampler(ins);
+        
       case DxbcOpcode::DclInput:
       case DxbcOpcode::DclInputSiv:
       case DxbcOpcode::DclInputSgv:
@@ -90,6 +93,17 @@ namespace dxvk {
   }
   
   
+  void DxbcCompiler::dclSampler(const DxbcInstruction&  ins) {
+    auto op = ins.operand(0);
+    
+    if (op.token().indexDimension() != 1)
+      throw DxvkError("DxbcCompiler::dclSampler: Invalid index dimension");
+    
+    const uint32_t index = op.index(0).immPart();
+    m_gen->dclSampler(index);
+  }
+  
+  
   void DxbcCompiler::dclInterfaceVar(const DxbcInstruction& ins) {
     auto op = ins.operand(0);
     auto opcode = ins.token().opcode();

src/dxbc/dxbc_compiler.h

@@ -35,6 +35,9 @@ namespace dxvk {
     void dclConstantBuffer(
       const DxbcInstruction&  ins);
     
+    void dclSampler(
+      const DxbcInstruction&  ins);
+    
     void dclInterfaceVar(
       const DxbcInstruction&  ins);
     

src/dxbc/gen/dxbc_gen_common.cpp

@@ -40,29 +40,39 @@ namespace dxvk {
   void DxbcCodeGen::dclConstantBuffer(
           uint32_t              bufferId,
           uint32_t              elementCount) {
+    // Uniform buffer data is stored as a fixed-size array
+    // of 4x32-bit vectors. SPIR-V requires explicit strides.
     uint32_t arrayType = m_module.defArrayTypeUnique(
       this->defValueType(DxbcValueType(DxbcScalarType::Float32, 4)),
       m_module.constu32(elementCount));
-    uint32_t structType = m_module.defStructTypeUnique(1, &arrayType);
-    
     m_module.decorateArrayStride(arrayType, 16);
+    
+    // SPIR-V requires us to put that array into a
+    // struct and decorate that struct as a block.
+    uint32_t structType = m_module.defStructTypeUnique(1, &arrayType);
     m_module.memberDecorateOffset(structType, 0, 0);
     m_module.decorateBlock(structType);
     
-    uint32_t varIndex = m_module.newVar(
+    // Variable that we'll use to access the buffer
+    uint32_t varId = m_module.newVar(
       m_module.defPointerType(structType, spv::StorageClassUniform),
       spv::StorageClassUniform);
     
+    m_module.setDebugName(varId,
+      str::format("cb", bufferId).c_str());
+    
+    m_constantBuffers.at(bufferId).varId = varId;
+    m_constantBuffers.at(bufferId).size  = elementCount;
+    
+    // Compute the DXVK binding slot index for the buffer.
+    // D3D11 needs to bind the actual buffers to this slot.
     uint32_t bindingId = computeResourceSlotId(m_shaderStage,
       DxbcBindingType::ConstantBuffer, bufferId);
     
-    m_module.setDebugName(varIndex, str::format("cb", bufferId).c_str());
-    m_module.decorateDescriptorSet(varIndex, 0);
-    m_module.decorateBinding(varIndex, bindingId);
-    m_constantBuffers.at(bufferId).varId = varIndex;
-    m_constantBuffers.at(bufferId).size  = elementCount;
+    m_module.decorateDescriptorSet(varId, 0);
+    m_module.decorateBinding(varId, bindingId);
     
-    // TODO compute resource slot index
+    // Store descriptor info for the shader interface
     DxvkResourceSlot resource;
     resource.slot = bindingId;
     resource.type = VK_DESCRIPTOR_TYPE_UNIFORM_BUFFER;
@@ -70,6 +80,37 @@ namespace dxvk {
   }
   
   
+  void DxbcCodeGen::dclSampler(uint32_t samplerId) {
+    // The sampler type is opaque, but we still have to
+    // define a pointer and a variable in oder to use it
+    uint32_t samplerType = m_module.defSamplerType();
+    uint32_t samplerPtrType = m_module.defPointerType(
+      samplerType, spv::StorageClassUniformConstant);
+    
+    // Define the sampler variable
+    uint32_t varId = m_module.newVar(samplerPtrType,
+      spv::StorageClassUniformConstant);
+    
+    m_module.setDebugName(varId,
+      str::format("s", samplerId).c_str());
+    
+    m_samplers.at(samplerId).varId = varId;
+    
+    // Compute binding slot index for the sampler
+    uint32_t bindingId = computeResourceSlotId(m_shaderStage,
+      DxbcBindingType::ImageSampler, samplerId);
+    
+    m_module.decorateDescriptorSet(varId, 0);
+    m_module.decorateBinding(varId, bindingId);
+    
+    // Store descriptor info for the shader interface
+    DxvkResourceSlot resource;
+    resource.slot = bindingId;
+    resource.type = VK_DESCRIPTOR_TYPE_SAMPLER;
+    m_resourceSlots.push_back(resource);
+  }
+  
+  
   DxbcValue DxbcCodeGen::defConstScalar(uint32_t v) {
     DxbcValue result;
     result.type    = DxbcValueType(DxbcScalarType::Uint32, 1);

src/dxbc/gen/dxbc_gen_common.h

@@ -26,8 +26,8 @@ namespace dxvk {
   /**
    * \brief Constant buffer binding
    * 
-   * Stores information about
-   * a constant buffer.
+   * Stores information required to
+   * access a constant buffer.
    */
   struct DxbcConstantBuffer {
     uint32_t varId = 0;
@@ -35,6 +35,16 @@ namespace dxvk {
   };
   
   
+  /**
+   * \brief Sampler binding
+   * 
+   * Stores a sampler variable.
+   */
+  struct DxbcSampler {
+    uint32_t varId = 0;
+  };
+  
+  
   /**
    * \brief DXBC code generator
    * 
@@ -57,6 +67,9 @@ namespace dxvk {
             uint32_t              bufferId,
             uint32_t              elementCount);
     
+    void dclSampler(
+            uint32_t              samplerId);
+    
     DxbcValue defConstScalar(uint32_t v);
     
     DxbcValue defConstVector(
@@ -160,6 +173,8 @@ namespace dxvk {
     std::vector<DxbcPointer> m_rRegs;
     
     std::array<DxbcConstantBuffer, 16>  m_constantBuffers;
+    std::array<DxbcSampler,        16>  m_samplers;
+    
     std::vector<DxvkResourceSlot>       m_resourceSlots;
     
     uint32_t defScalarType(