LYGIA Shader Library

sourceAtop (`lygia`/`color`/`composite`/`sourceAtop`)

Porter Duff Source Atop Compositing

Use:

<vec4> compositeSourceAtop(<vec4> src, <vec4> dst)

Check it on Github


#ifndef FNC_COMPOSITE_SRC_ATOP
#define FNC_COMPOSITE_SRC_ATOP

float compositeSourceAtop(float src, float dst) {
    return src * dst + dst * (1.0 - src);
}

vec3 compositeSourceAtop(vec3 srcColor, vec3 dstColor, float srcAlpha, float dstAlpha) {
    return srcColor * dstAlpha + dstColor * (1.0 - srcAlpha);
}

vec4 compositeSourceAtop(vec4 srcColor, vec4 dstColor) {
    vec4 result = vec4(0.0);

    result.rgb = compositeSourceAtop(srcColor.rgb, dstColor.rgb, srcColor.a, dstColor.a);
    result.a = compositeSourceAtop(srcColor.a, dstColor.a);

    return result;
}
#endif

Use:

<float4> compositeSourceAtop(<float4> src, <float4> dst)

Check it on Github


#ifndef FNC_COMPOSITE_SRC_ATOP
#define FNC_COMPOSITE_SRC_ATOP

float compositeSourceAtop(float src, float dst) {
    return src * dst + dst * (1.0 - src);
}

float3 compositeSourceAtop(float3 srcColor, float3 dstColor, float srcAlpha, float dstAlpha) {
    return srcColor * dstAlpha + dstColor * (1.0 - srcAlpha);
}

float4 compositeSourceAtop(float4 srcColor, float4 dstColor) {
    float4 result;

    result.rgb = compositeSourceAtop(srcColor.rgb, dstColor.rgb, srcColor.a, dstColor.a);
    result.a = compositeSourceAtop(srcColor.a, dstColor.a);

    return result;
}
#endif

Use:

<float4> compositeSourceAtop(<float4> src, <float4> dst)

Check it on Github


#ifndef FNC_COMPOSITE_SRC_ATOP
#define FNC_COMPOSITE_SRC_ATOP

float compositeSourceAtop(float src, float dst)
{
    return src * dst + dst * (1.0 - src);
}

float3 compositeSourceAtop(float3 srcColor, float3 dstColor, float srcAlpha, float dstAlpha)
{
    return srcColor * dstAlpha + dstColor * (1.0 - srcAlpha);
}

float4 compositeSourceAtop(float4 srcColor, float4 dstColor) 
{
    float4 result;

    result.rgb = compositeSourceAtop(srcColor.rgb, dstColor.rgb, srcColor.a, dstColor.a);
    result.a = compositeSourceAtop(srcColor.a, dstColor.a);

    return result;
}
#endif

Licenses

LYGIA is dual-licensed under the Prosperity License and the Patron License for sponsors and contributors.

Sponsors and contributors are automatically added to the Patron License and they can ignore the any non-commercial rule of the Prosperity Licensed software (please take a look to the exception).

It's also possible to get a permanent comercial license hook to a single and specific version of LYGIA.

LYGIA Shader Library

sourceAtop (lygia/color/composite/sourceAtop)

Licenses

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sourceAtop (`lygia`/`color`/`composite`/`sourceAtop`)