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sampler2D BaseSampler = sampler_state
{
MinFilter = Nearest;
MagFilter = Linear;
WrapS = Clamp;
WrapT = Clamp;
};
void v_VolumeFog
(
in float3 modelPosition : POSITION,
in float4 modelColor : COLOR,
in float2 modelTCoord : TEXCOORD0,
out float4 clipPosition : POSITION,
out float4 vertexColor : COLOR,
out float2 vertexTCoord : TEXCOORD0,
uniform float4x4 PVWMatrix
)
{
// Transform the position from model space to clip space.
clipPosition = mul(PVWMatrix, float4(modelPosition,1.0f));
// Pass through the vertex color and texture coordinate.
vertexColor = modelColor;
vertexTCoord = modelTCoord;
}
void p_VolumeFog
(
in float4 vertexColor : COLOR,
in float2 vertexTCoord : TEXCOORD0,
out float4 pixelColor : COLOR
)
{
// The blending equation is
// (rf,gf,bf) = (1-av)*(rt,gt,bt) + av*(rv,gv,bv)
// where (rf,gf,bf) is the final color, (rt,gt,bt) is the texture color,
// and (rv,gv,bv,av) is the vertex color.
// Sample the texture image.
float4 textureColor = tex2D(BaseSampler, vertexTCoord);
pixelColor.rgb = (1.0f - vertexColor.a)*textureColor.rgb +
vertexColor.a*vertexColor.rgb;
pixelColor.a = 1.0f;
}
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