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void valtorgb_opti_constant(
float fac, float edge, vec4 color1, vec4 color2, out vec4 outcol, out float outalpha)
{
outcol = (fac > edge) ? color2 : color1;
outalpha = outcol.a;
}
void valtorgb_opti_linear(
float fac, vec2 mulbias, vec4 color1, vec4 color2, out vec4 outcol, out float outalpha)
{
fac = clamp(fac * mulbias.x + mulbias.y, 0.0, 1.0);
outcol = mix(color1, color2, fac);
outalpha = outcol.a;
}
void valtorgb(float fac, sampler1DArray colormap, float layer, out vec4 outcol, out float outalpha)
{
outcol = texture(colormap, vec2(fac, layer));
outalpha = outcol.a;
}
void valtorgb_nearest(
float fac, sampler1DArray colormap, float layer, out vec4 outcol, out float outalpha)
{
fac = clamp(fac, 0.0, 1.0);
outcol = texelFetch(colormap, ivec2(fac * (textureSize(colormap, 0).x - 1), layer), 0);
outalpha = outcol.a;
}
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