obs-StreamFX/data/effects/virtual-greenscreen.effect

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#include "shared.effect"
uniform texture2d InputA<
bool automatic = true;
>;
uniform texture2d InputB<
bool automatic = true;
>;
uniform float Threshold<
string name = "Threshold";
string suffix = " %";
float minimum = 0.;
float maximum = 100.;
float step = .01;
float scale = .01;
> = 10.;
uniform float ThresholdRange<
string name = "Threshold Range";
string suffix = " %";
float minimum = 0.;
float maximum = 100.;
float step = .01;
float scale = .01;
> = 10.;
//------------------------------------------------------------------------------
// Technique: Draw
//------------------------------------------------------------------------------
// Parameters:
// - InputA: RGBA Texture
// - InputB: XXXA Texture
float4 PSDrawAlpha(VertexData vtx) : TARGET {
return InputA.Sample(BlankSampler, vtx.uv);
};
technique DrawAlpha
{
pass
{
vertex_shader = DefaultVertexShader(vtx);
pixel_shader = PSDrawAlpha(vtx);
};
};
//------------------------------------------------------------------------------
// Technique: Draw
//------------------------------------------------------------------------------
// Parameters:
// - InputA: RGBX Texture
// - InputB: XXXA Texture
// - Threshold: Alha threshold to be "visible".
float4 PSDrawAlphaThreshold(VertexData vtx) : TARGET {
float4 rgba = InputA.Sample(BlankSampler, vtx.uv);
float4 xxxa = InputB.Sample(BlankSampler, vtx.uv);
rgba.a = smoothstep(Threshold - ThresholdRange * .5, Threshold + ThresholdRange * .5, xxxa.a);
return rgba;
};
technique DrawAlphaThreshold
{
pass
{
vertex_shader = DefaultVertexShader(vtx);
pixel_shader = PSDrawAlphaThreshold(vtx);
};
};