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uniform float4x4 ViewProj;
uniform texture2d image;
uniform float threshold;
uniform float3 levels;
float RGBToLum(float3 color)
{
return 0.299 * color.r + 0.587 * color.g + 0.114 * color.b;
}
sampler_state textureSampler{
Filter = Linear;
AddressU = Clamp;
AddressV = Clamp;
};
struct VertData
{
float4 pos : POSITION;
float2 uv : TEXCOORD0;
};
VertData mainTransform(VertData v_in)
{
v_in.pos = mul(float4(v_in.pos.xyz, 1.0), ViewProj);
return v_in;
}
float4 mainImage(VertData v_in) : TARGET
{
float4 color = image.Sample(textureSampler, v_in.uv);
//float lum = RGBToLum(color.rgb);
float lum = dot(color.rgb, levels);
return lum > threshold ? color : float4(0.0, 0.0, 0.0, color.a);
}
technique Draw
{
pass
{
vertex_shader = mainTransform(v_in);
pixel_shader = mainImage(v_in);
}
}
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