EQ2EMu/EQ2/devtools/EQ2ModelViewer/EQ2ModelViewer/bin/Release/Light.vs

cbuffer MatrixBuffer
{
	matrix worldMatrix;
	matrix viewMatrix;
	matrix projectionMatrix;
};

cbuffer CameraBuffer
{
	float3 cameraPosition;
	float padding;
};

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;
};

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 matracies
	output.position = mul(input.position, worldMatrix);
	output.position = mul(output.position, viewMatrix);
	output.position = mul(output.position, projectionMatrix);

	// Store the input color for the pixel shader to use.
	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
	output.viewDirection = cameraPosition.xyz - worldPosition.xyz;

	// Normalize the viewing direction vector
	output.viewDirection = normalize(output.viewDirection);

	return output;
}