Début Tuto 10

enginecustom/Light.vs

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+////////////////////////////////////////////////////////////////////////////////
+// Filename: light.vs
+////////////////////////////////////////////////////////////////////////////////
+
+
+/////////////
+// GLOBALS //
+/////////////
+cbuffer MatrixBuffer
+{
+    matrix worldMatrix;
+    matrix viewMatrix;
+    matrix projectionMatrix;
+};
+cbuffer CameraBuffer
+{
+    float3 cameraPosition;
+    float padding;
+};
+//////////////
+// TYPEDEFS //
+//////////////
+struct VertexInputType
+{
+    float4 position : POSITION;
+    float2 tex : TEXCOORD0;
+    float3 normal : NORMAL;
+};
+struct PixelInputType
+{
+    float4 position : SV_POSITION;
+    float2 tex : TEXCOORD0;
+    float3 normal : NORMAL;
+    float3 viewDirection : TEXCOORD1;
+};
+
+////////////////////////////////////////////////////////////////////////////////
+// Vertex Shader
+////////////////////////////////////////////////////////////////////////////////
+PixelInputType LightVertexShader(VertexInputType input)
+{
+    PixelInputType output;
+    float4 worldPosition;
+
+
+    // Change the position vector to be 4 units for proper matrix calculations.
+    input.position.w = 1.0f;
+
+    // Calculate the position of the vertex against the world, view, and projection matrices.
+    output.position = mul(input.position, worldMatrix);
+    output.position = mul(output.position, viewMatrix);
+    output.position = mul(output.position, projectionMatrix);
+    
+    // Store the texture coordinates for the pixel shader.
+    output.tex = input.tex;
+    
+    // Calculate the normal vector against the world matrix only.
+    output.normal = mul(input.normal, (float3x3)worldMatrix);
+	
+    // Normalize the normal vector.
+    output.normal = normalize(output.normal);
+
+    // Calculate the position of the vertex in the world.
+    worldPosition = mul(input.position, worldMatrix);
+
+    // Determine the viewing direction based on the position of the camera and the position of the vertex in the world.
+    output.viewDirection = cameraPosition.xyz - worldPosition.xyz;
+	
+    // Normalize the viewing direction vector.
+    output.viewDirection = normalize(output.viewDirection);
+
+    return output;
+}