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libobs: Add DrawAlphaDivide variant shaders

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Useful for future 10-bit HDR DeckLink playback support.
This commit is contained in:
jpark37
2023-04-01 03:19:49 -07:00
committed by Lain
parent f049d04af4
commit 3e80fff18e
1 changed files with 44 additions and 1 deletions
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45
libobs/data/default.effect
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@@ -31,10 +31,35 @@ float4 PSDrawBare(VertInOut vert_in) : TARGET
float4 PSDrawAlphaDivide(VertInOut vert_in) : TARGET
{
float4 rgba = image.Sample(def_sampler, vert_in.uv);
rgba.rgb *= max(1. / rgba.a, 0.);
rgba.rgb = (rgba.a > 0.) ? (rgba.rgb / rgba.a) : 0.;
return rgba;
}
float4 PSDrawAlphaDivideTonemap(VertInOut vert_in) : TARGET
{
float4 rgba = image.Sample(def_sampler, vert_in.uv);
rgba.rgb = (rgba.a > 0.) ? (rgba.rgb / rgba.a) : 0.;
rgba.rgb = rec709_to_rec2020(rgba.rgb);
rgba.rgb = reinhard(rgba.rgb);
rgba.rgb = rec2020_to_rec709(rgba.rgb);
return rgba;
}
float4 PSDrawAlphaDivideR10L(VertInOut vert_in) : TARGET
{
float4 rgba = image.Sample(def_sampler, vert_in.uv);
rgba.rgb = (rgba.a > 0.) ? (rgba.rgb / rgba.a) : 0.;
rgba.rgb *= multiplier;
rgba.rgb = rec709_to_rec2020(rgba.rgb);
rgba.rgb = linear_to_st2084(rgba.rgb);
uint3 rgb1023 = uint3(mad(rgba.rgb, 1023., .5));
uint b = (rgb1023.b & 0x3Fu) << 2;
uint g = ((rgb1023.b & 0x3C0u) >> 6) | ((rgb1023.g & 0xFu) << 4);
uint r = ((rgb1023.g & 0x3F0u) >> 4) | ((rgb1023.r & 0x3u) << 6);
uint a = ((rgb1023.r & 0x3FCu) >> 2);
return float4(uint4(r, g, b, a)) / 255.;
}
float4 PSDrawNonlinearAlpha(VertInOut vert_in) : TARGET
{
float4 rgba = image.Sample(def_sampler, vert_in.uv);
@@ -130,6 +155,24 @@ technique DrawAlphaDivide
}
}
technique DrawAlphaDivideTonemap
{
pass
{
vertex_shader = VSDefault(vert_in);
pixel_shader = PSDrawAlphaDivideTonemap(vert_in);
}
}
technique DrawAlphaDivideR10L
{
pass
{
vertex_shader = VSDefault(vert_in);
pixel_shader = PSDrawAlphaDivideR10L(vert_in);
}
}
technique DrawNonlinearAlpha
{
pass