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libobs: DrawSrgbDecompressPremultiplied technique

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Necessary for an upcoming fix to browser source.
This commit is contained in:
jpark37
2021-07-11 08:11:12 -07:00
committed by Jim
parent 09865c2ad4
commit 05b507d900
2 changed files with 44 additions and 0 deletions
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libobs/data/default_rect.effect
+27
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@@ -30,6 +30,24 @@ float4 PSDrawOpaque(VertInOut vert_in) : TARGET
return float4(image.Sample(def_sampler, vert_in.uv).rgb, 1.0);
}
float srgb_nonlinear_to_linear_channel(float u)
{
return (u <= 0.04045) ? (u / 12.92) : pow((u + 0.055) / 1.055, 2.4);
}
float3 srgb_nonlinear_to_linear(float3 v)
{
return float3(srgb_nonlinear_to_linear_channel(v.r), srgb_nonlinear_to_linear_channel(v.g), srgb_nonlinear_to_linear_channel(v.b));
}
float4 PSDrawSrgbDecompressPremultiplied(VertInOut vert_in) : TARGET
{
float4 rgba = image.Sample(def_sampler, vert_in.uv);
rgba.rgb = max(float3(0.0, 0.0, 0.0), rgba.rgb / rgba.a);
rgba.rgb = srgb_nonlinear_to_linear(rgba.rgb);
return rgba;
}
technique Draw
{
pass
@@ -47,3 +65,12 @@ technique DrawOpaque
pixel_shader = PSDrawOpaque(vert_in);
}
}
technique DrawSrgbDecompressPremultiplied
{
pass
{
vertex_shader = VSDefault(vert_in);
pixel_shader = PSDrawSrgbDecompressPremultiplied(vert_in);
}
}