Shader: Add support for exp intrinsic

include/Nazara/Shader/Ast/Enums.hpp

@@ -98,6 +98,7 @@ namespace Nz
 		{
 			CrossProduct = 0,
 			DotProduct = 1,
+			Exp = 7,
 			Length = 3,
 			Max = 4,
 			Min = 5,

src/Nazara/Shader/Ast/SanitizeVisitor.cpp

@@ -68,6 +68,7 @@ namespace Nz::ShaderAst
 		{
 			RegisterIntrinsic("cross", IntrinsicType::CrossProduct);
 			RegisterIntrinsic("dot", IntrinsicType::DotProduct);
+			RegisterIntrinsic("exp", IntrinsicType::Exp);
 			RegisterIntrinsic("length", IntrinsicType::Length);
 			RegisterIntrinsic("max", IntrinsicType::Max);
 			RegisterIntrinsic("min", IntrinsicType::Min);
@@ -1389,15 +1390,21 @@ namespace Nz::ShaderAst
 				break;
 			}
 
+			case IntrinsicType::Exp:
+			{
+				if (node.parameters.size() != 1)
+					throw AstError{ "Expected only one parameters" };
+
+				MandatoryExpr(node.parameters.front());
+				break;
+			}
+
 			case IntrinsicType::Length:
 			{
 				if (node.parameters.size() != 1)
 					throw AstError{ "Expected only one parameters" };
 
-				for (auto& param : node.parameters)
+				const ExpressionType& type = GetExpressionType(MandatoryExpr(node.parameters.front()));
-					MandatoryExpr(param);
-
-				const ExpressionType& type = GetExpressionType(*node.parameters.front());
 				if (!IsVectorType(type))
 					throw AstError{ "Expected a vector" };
 
@@ -1438,7 +1445,7 @@ namespace Nz::ShaderAst
 			case IntrinsicType::DotProduct:
 			case IntrinsicType::Length:
 			{
-				ExpressionType type = GetExpressionType(*node.parameters.front());
+				const ExpressionType& type = GetExpressionType(*node.parameters.front());
 				if (!IsVectorType(type))
 					throw AstError{ "DotProduct expects vector types" };
 
@@ -1461,6 +1468,7 @@ namespace Nz::ShaderAst
 				break;
 			}
 
+			case IntrinsicType::Exp:
 			case IntrinsicType::Pow:
 			{
 				const ExpressionType& type = GetExpressionType(*node.parameters.front());

src/Nazara/Shader/GlslWriter.cpp

@@ -1076,6 +1076,10 @@ namespace Nz
 				Append("dot");
 				break;
 
+			case ShaderAst::IntrinsicType::Exp:
+				Append("exp");
+				break;
+
 			case ShaderAst::IntrinsicType::Length:
 				Append("length");
 				break;

src/Nazara/Shader/LangWriter.cpp

@@ -812,6 +812,10 @@ namespace Nz
 				Append("dot");
 				break;
 
+			case ShaderAst::IntrinsicType::Exp:
+				Append("exp");
+				break;
+
 			case ShaderAst::IntrinsicType::Length:
 				Append("length");
 				break;

src/Nazara/Shader/SpirvAstVisitor.cpp

@@ -743,6 +743,22 @@ namespace Nz
 				break;
 			}
 
+			case ShaderAst::IntrinsicType::Exp:
+			{
+				UInt32 glslInstructionSet = m_writer.GetExtendedInstructionSet("GLSL.std.450");
+
+				const ShaderAst::ExpressionType& parameterType = GetExpressionType(*node.parameters[0]);
+				assert(IsPrimitiveType(parameterType) || IsVectorType(parameterType));
+				UInt32 typeId = m_writer.GetTypeId(parameterType);
+
+				UInt32 param = EvaluateExpression(node.parameters[0]);
+				UInt32 resultId = m_writer.AllocateResultId();
+
+				m_currentBlock->Append(SpirvOp::OpExtInst, typeId, resultId, glslInstructionSet, GLSLstd450Exp, param);
+				PushResultId(resultId);
+				break;
+			}
+
 			case ShaderAst::IntrinsicType::Length:
 			{
 				UInt32 glslInstructionSet = m_writer.GetExtendedInstructionSet("GLSL.std.450");
@@ -815,14 +831,6 @@ namespace Nz
 				assert(IsPrimitiveType(parameterType) || IsVectorType(parameterType));
 				UInt32 typeId = m_writer.GetTypeId(parameterType);
 
-				ShaderAst::PrimitiveType basicType;
-				if (IsPrimitiveType(parameterType))
-					basicType = std::get<ShaderAst::PrimitiveType>(parameterType);
-				else if (IsVectorType(parameterType))
-					basicType = std::get<ShaderAst::VectorType>(parameterType).type;
-				else
-					throw std::runtime_error("unexpected expression type");
-
 				UInt32 firstParam = EvaluateExpression(node.parameters[0]);
 				UInt32 secondParam = EvaluateExpression(node.parameters[1]);
 				UInt32 resultId = m_writer.AllocateResultId();

src/Nazara/Shader/SpirvWriter.cpp

@@ -336,6 +336,7 @@ namespace Nz
 					{
 						// Require GLSL.std.450
 						case ShaderAst::IntrinsicType::CrossProduct:
+						case ShaderAst::IntrinsicType::Exp:
 						case ShaderAst::IntrinsicType::Length:
 						case ShaderAst::IntrinsicType::Max:
 						case ShaderAst::IntrinsicType::Min: