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#version 420 core
#include "clip.frag.glsl"
layout(location = 0) in vec2 inPos;
layout(location = 1) in vec2 inStartTexCoord;
layout(location = 2) in vec2 inEndTexCoord;
layout(location = 3) flat in uint inBlendMode;
layout(set = 0, binding = 0) uniform sampler2D startTexture;
layout(set = 1, binding = 0) uniform sampler2D endTexture;
layout(location = 0) out vec4 color;
vec3
multiply (vec3 source, vec3 backdrop, float opacity)
{
vec3 result = source * backdrop;
return mix (source, result, opacity);
}
vec3
difference (vec3 source, vec3 backdrop, float opacity)
{
vec3 result = abs (source - backdrop);
return mix (source, result, opacity);
}
vec3
screen (vec3 source, vec3 backdrop, float opacity)
{
vec3 result = source + backdrop - source * backdrop;
return mix (source, result, opacity);
}
float
hard_light (float source, float backdrop)
{
if (source <= 0.5)
return 2 * backdrop * source;
else
return 2 * (backdrop + source - backdrop * source) - 1;
}
vec3
hard_light (vec3 source, vec3 backdrop, float opacity)
{
vec3 result = vec3 (hard_light (source.r, backdrop.r),
hard_light (source.g, backdrop.g),
hard_light (source.b, backdrop.b));
return mix (source, result, opacity);
}
float
soft_light (float source, float backdrop)
{
float db;
if (backdrop <= 0.25)
db = ((16 * backdrop - 12) * backdrop + 4) * backdrop;
else
db = sqrt (backdrop);
if (source <= 0.5)
return backdrop - (1 - 2 * source) * backdrop * (1 - backdrop);
else
return backdrop + (2 * source - 1) * (db - backdrop);
}
vec3
soft_light (vec3 source, vec3 backdrop, float opacity)
{
vec3 result = vec3 (soft_light (source.r, backdrop.r),
soft_light (source.g, backdrop.g),
soft_light (source.b, backdrop.b));
return mix (source, result, opacity);
}
vec3
overlay (vec3 source, vec3 backdrop, float opacity)
{
return hard_light (backdrop, source, opacity);
}
vec3
darken (vec3 source, vec3 backdrop, float opacity)
{
vec3 result = min (source, backdrop);
return mix (source, result, opacity);
}
vec3
lighten (vec3 source, vec3 backdrop, float opacity)
{
vec3 result = max (source, backdrop);
return mix (source, result, opacity);
}
float
color_dodge (float source, float backdrop)
{
return (source == 1.0) ? source : min (backdrop / (1.0 - source), 1.0);
}
vec3
color_dodge (vec3 source, vec3 backdrop, float opacity)
{
vec3 result = vec3 (color_dodge (source.r, backdrop.r),
color_dodge (source.g, backdrop.g),
color_dodge (source.b, backdrop.b));
return mix (source, result, opacity);
}
float
color_burn (float source, float backdrop)
{
return (source == 0.0) ? source : max ((1.0 - ((1.0 - backdrop) / source)), 0.0);
}
vec3
color_burn (vec3 source, vec3 backdrop, float opacity)
{
vec3 result = vec3 (color_burn (source.r, backdrop.r),
color_burn (source.g, backdrop.g),
color_burn (source.b, backdrop.b));
return mix (source, result, opacity);
}
vec3
exclusion (vec3 source, vec3 backdrop, float opacity)
{
vec3 result = backdrop + source - 2.0 * backdrop * source;
return mix (source, result, opacity);
}
float
combine (float source, float backdrop)
{
return source + backdrop * (1 - source);
}
void main()
{
vec4 source = texture (startTexture, inStartTexCoord);
vec4 backdrop = texture (endTexture, inEndTexCoord);
vec3 rgb = vec3(1,0,0);
float a = 1;
a = combine (source.a, backdrop.a);
if (inBlendMode == 0) // default
{
rgb = source.rgb;
a = source.a;
}
else if (inBlendMode == 1)
rgb = multiply (source.rgb, backdrop.rgb, backdrop.a);
else if (inBlendMode == 2)
rgb = screen (source.rgb, backdrop.rgb, backdrop.a);
else if (inBlendMode == 3)
rgb = overlay (source.rgb, backdrop.rgb, backdrop.a);
else if (inBlendMode == 4)
rgb = darken (source.rgb, backdrop.rgb, backdrop.a);
else if (inBlendMode == 5)
rgb = lighten (source.rgb, backdrop.rgb, backdrop.a);
else if (inBlendMode == 6)
rgb = color_dodge (source.rgb, backdrop.rgb, backdrop.a);
else if (inBlendMode == 7)
rgb = color_burn (source.rgb, backdrop.rgb, backdrop.a);
else if (inBlendMode == 8)
rgb = hard_light (source.rgb, backdrop.rgb, backdrop.a);
else if (inBlendMode == 9)
rgb = soft_light (source.rgb, backdrop.rgb, backdrop.a);
else if (inBlendMode == 10)
rgb = difference (source.rgb, backdrop.rgb, backdrop.a);
else if (inBlendMode == 11)
rgb = exclusion (source.rgb, backdrop.rgb, backdrop.a);
else
discard;
color = clip (inPos, vec4 (rgb, a));
}
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