Technique : base("VolumeRenderBase") =
{
	Language = "HLSL11";
	
	Pass =
	{
		DepthWrite = false;
		DepthRead = false;
	
		Common = 
		{
			struct VStoGS
			{
				float4 position : SV_POSITION;
				float2 uv0 : TEXCOORD0;
				uint layerIdx : TEXCOORD1;
			};
			
			struct GStoFS
			{
				float4 position : SV_POSITION;
				float2 uv0 : TEXCOORD0;
				uint layerIdx : SV_RenderTargetArrayIndex;
			};			
		};

		Vertex =
		{
			struct VertexInput
			{
				float2 screenPos : POSITION;
				float2 uv0 : TEXCOORD0;
				uint layerIdx : SV_InstanceID;
			};
			
			VStoGS main(VertexInput input)
			{
				VStoGS output;
			
				output.position = float4(input.screenPos, 0, 1);
				output.uv0 = input.uv0;
				output.layerIdx = input.layerIdx;
				
				return output;
			}
		};
		
		Geometry = 
		{		
			[maxvertexcount(3)]
			void main(triangle VStoGS input[3], inout TriangleStream<GStoFS> outStream)
			{
				GStoFS vert0;
				vert0.position = input[0].position;
				vert0.uv0 = input[0].uv0;
				vert0.layerIdx = input[0].layerIdx;

				GStoFS vert1;
				vert1.position = input[1].position;
				vert1.uv0 = input[1].uv0;
				vert1.layerIdx = input[1].layerIdx;

				GStoFS vert2;
				vert2.position = input[2].position;
				vert2.uv0 = input[2].uv0;
				vert2.layerIdx = input[2].layerIdx;

				outStream.Append(vert0);
				outStream.Append(vert1);
				outStream.Append(vert2);
			}
		};
	};
};

Technique : base("VolumeRenderBase") =
{
	Language = "GLSL";
	
	Pass =
	{
		DepthWrite = false;
		DepthRead = false;
	
		Vertex =
		{
			layout(location = 0) in vec2 bs_position;
			layout(location = 1) in vec2 bs_texcoord0;
			
			layout(location = 0) out VStoGS
			{
				vec2 uv0;
				flat int layerIdx;
			} VSOutput;
			
			out gl_PerVertex
			{
				vec4 gl_Position;
			};
		
			void main()
			{
				gl_Position = vec4(bs_position, 0, 1);
				VSOutput.uv0 = bs_texcoord0;
				VSOutput.layerIdx = int(gl_InstanceID);
			}
		};
		
		Geometry = 
		{		
			layout (triangles) in;
			layout (triangle_strip, max_vertices=3) out;
		
			layout(location = 0) in VStoGS
			{
				vec2 uv0;
				flat int layerIdx;
			} GSInput[3];
		
			out GStoFS
			{
				layout(location = 0) vec2 uv0;
			} GSOutput;
		
			in gl_PerVertex 
			{
				vec4 gl_Position;
			} gl_in[];
		
			out gl_PerVertex
			{
				vec4 gl_Position;
			};
		
			void main()
			{
				gl_Layer = GSInput[0].layerIdx;
			
				gl_Position = gl_in[0].gl_Position;
				GSOutput.uv0 = GSInput[0].uv0;
				EmitVertex();
				
				gl_Position = gl_in[1].gl_Position;
				GSOutput.uv0 = GSInput[1].uv0;
				EmitVertex();
				
				gl_Position = gl_in[2].gl_Position;
				GSOutput.uv0 = GSInput[2].uv0;
				EmitVertex();
			}
		};
	};
};