Mesh Rendering - Practical Rendering and Computation with Direct3D 11 - page 386

Texture2D ColorTexture : register( t0 );
SamplerState LinearSampler : register( s0 );

struct VS_INPUT
{

float3 position : POSITION;
float2 tex : TEXCOORDS0;

float3 normal : NORMAL;

};

struct VS_OUTPUT
{

float4 position : SV_Position;
float2 tex : TEXCOORD0;

float3 normal : NORMAL;

float3 light : LIGHT;

};

VS_OUTPUT VSMAIN( in VS_INPUT input )
{

VS_OUTPUT output;

// Generate the clip space position for feeding to the rasterizer
output.position = mul( float4( input.position, 1.0f ), WorldViewProjMatrix );

// Generate the world space normal vector
output.normal = mul( input.normal, (float3x3)WorldMatrix );

// Find the world space position of the vertex
float3 PositionWS = mul( float4( input.position, 1.0f ), WorldMatrix ).xyz;

// Calculate the world space light vector
output.light = LightPositionWS - PositionWS;

// Pass through the texture coordinates
output.tex = input.tex;

return output;

}

Listing 8.1 . The vertex shader for static mesh rendering.

Since no hardware tessellation is needed in this technique, we can skip the hull, tessel-
lator, and domain shader stages. We also don't need per-primitive level manipulations of the
model data, so the geometry shader stage is also not used. This means that the vertices emit-
ted from the vertex shader are directly consumed by the rasterizer stage. Once the rasterizer
receives a primitive (consisting of three vertices for our triangle lists) it executes, and produces
fragments to be consumed by the pixel shader. Each fragment uses a format similar to that of