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obs-filters: Apply color grade filter in linear space

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This commit is contained in:
jpark37 2021-01-19 11:17:50 -08:00
parent e812a133ee
commit 22a7fd1cf3
2 changed files with 26 additions and 4 deletions
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2
plugins/obs-filters/color-grade-filter.c
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@ -452,8 +452,10 @@ static void color_grade_filter_render(void *data, gs_effect_t *effect)
param = gs_effect_get_param_by_name(filter->effect, "cube_width_i");
gs_effect_set_float(param, 1.0f / filter->cube_width);
const bool previous = gs_set_linear_srgb(true);
obs_source_process_filter_tech_end(filter->context, filter->effect, 0,
0, tech_name);
gs_set_linear_srgb(previous);
UNUSED_PARAMETER(effect);
}

28
plugins/obs-filters/data/color_grade_filter.effect
View File

@ -35,9 +35,29 @@ VertDataOut VSDefault(VertDataIn v_in)
return vert_out;
}
float srgb_linear_to_nonlinear_channel(float u)
{
return (u <= 0.0031308) ? (12.92 * u) : ((1.055 * pow(u, 1.0 / 2.4)) - 0.055);
}
float4 srgb_linear_to_nonlinear(float4 v)
{
return float4(srgb_linear_to_nonlinear_channel(v.r), srgb_linear_to_nonlinear_channel(v.g), srgb_linear_to_nonlinear_channel(v.b), v.a);
}
float srgb_nonlinear_to_linear_channel(float u)
{
return (u <= 0.04045) ? (u / 12.92) : pow((u + 0.055) / 1.055, 2.4);
}
float4 srgb_nonlinear_to_linear(float4 v)
{
return float4(srgb_nonlinear_to_linear_channel(v.r), srgb_nonlinear_to_linear_channel(v.g), srgb_nonlinear_to_linear_channel(v.b), v.a);
}
float4 LUT1D(VertDataOut v_in) : TARGET
{
float4 textureColor = image.Sample(textureSampler, v_in.uv);
float4 textureColor = srgb_linear_to_nonlinear(image.Sample(textureSampler, v_in.uv));
if (textureColor.r >= domain_min.r && textureColor.r <= domain_max.r) {
float u = textureColor.r * clut_scale.r + clut_offset.r;
@ -57,12 +77,12 @@ float4 LUT1D(VertDataOut v_in) : TARGET
textureColor.b = lerp(textureColor.b, channel, clut_amount);
}
return textureColor;
return srgb_nonlinear_to_linear(textureColor);
}
float4 LUT3D(VertDataOut v_in) : TARGET
{
float4 textureColor = image.Sample(textureSampler, v_in.uv);
float4 textureColor = srgb_linear_to_nonlinear(image.Sample(textureSampler, v_in.uv));
float r = textureColor.r;
float g = textureColor.g;
float b = textureColor.b;
@ -145,7 +165,7 @@ float4 LUT3D(VertDataOut v_in) : TARGET
textureColor.rgb = lerp(textureColor.rgb, luttedColor, clut_amount);
}
return textureColor;
return srgb_nonlinear_to_linear(textureColor);
}
technique Draw1D