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void node_composite_alpha_over_mixed(
float factor, vec4 color, vec4 over_color, float premultiply_factor, out vec4 result)
{
if (over_color.a <= 0.0) {
result = color;
}
else if (factor == 1.0 && over_color.a >= 1.0) {
result = over_color;
}
else {
float add_factor = 1.0 - premultiply_factor + over_color.a * premultiply_factor;
float premultiplier = factor * add_factor;
float multiplier = 1.0 - factor * over_color.a;
result = multiplier * color + vec2(premultiplier, factor).xxxy * over_color;
}
}
void node_composite_alpha_over_key(float factor, vec4 color, vec4 over_color, out vec4 result)
{
if (over_color.a <= 0.0) {
result = color;
}
else if (factor == 1.0 && over_color.a >= 1.0) {
result = over_color;
}
else {
result = mix(color, vec4(over_color.rgb, 1.0), factor * over_color.a);
}
}
void node_composite_alpha_over_premultiply(float factor,
vec4 color,
vec4 over_color,
out vec4 result)
{
if (over_color.a < 0.0) {
result = color;
}
else if (factor == 1.0 && over_color.a >= 1.0) {
result = over_color;
}
else {
float multiplier = 1.0 - factor * over_color.a;
result = multiplier * color + factor * over_color;
}
}
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