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#version 300 es
#extension GL_ARB_shading_language_include : enable
precision highp float;
in vec4 v_color;
in vec2 v_texcoord;
uniform int skipCM;
uniform int sourceTF; // eTransferFunction
uniform int targetTF; // eTransferFunction
uniform mat4x2 targetPrimaries;
uniform vec2 topLeft;
uniform vec2 bottomRight;
uniform vec2 fullSize;
uniform float radius;
uniform float roundingPower;
uniform float range;
uniform float shadowPower;
#include "CM.glsl"
float pixAlphaRoundedDistance(float distanceToCorner) {
if (distanceToCorner > radius) {
return 0.0;
}
if (distanceToCorner > radius - range) {
return pow((range - (distanceToCorner - radius + range)) / range, shadowPower); // i think?
}
return 1.0;
}
float modifiedLength(vec2 a) {
return pow(pow(abs(a.x),roundingPower)+pow(abs(a.y),roundingPower),1.0/roundingPower);
}
layout(location = 0) out vec4 fragColor;
void main() {
vec4 pixColor = v_color;
float originalAlpha = pixColor[3];
bool done = false;
vec2 pixCoord = fullSize * v_texcoord;
// ok, now we check the distance to a border.
if (pixCoord[0] < topLeft[0]) {
if (pixCoord[1] < topLeft[1]) {
// top left
pixColor[3] = pixColor[3] * pixAlphaRoundedDistance(modifiedLength(pixCoord - topLeft));
done = true;
} else if (pixCoord[1] > bottomRight[1]) {
// bottom left
pixColor[3] = pixColor[3] * pixAlphaRoundedDistance(modifiedLength(pixCoord - vec2(topLeft[0], bottomRight[1])));
done = true;
}
} else if (pixCoord[0] > bottomRight[0]) {
if (pixCoord[1] < topLeft[1]) {
// top right
pixColor[3] = pixColor[3] * pixAlphaRoundedDistance(modifiedLength(pixCoord - vec2(bottomRight[0], topLeft[1])));
done = true;
} else if (pixCoord[1] > bottomRight[1]) {
// bottom right
pixColor[3] = pixColor[3] * pixAlphaRoundedDistance(modifiedLength(pixCoord - bottomRight));
done = true;
}
}
if (!done) {
// distance to all straight bb borders
float distanceT = pixCoord[1];
float distanceB = fullSize[1] - pixCoord[1];
float distanceL = pixCoord[0];
float distanceR = fullSize[0] - pixCoord[0];
// get the smallest
float smallest = min(min(distanceT, distanceB), min(distanceL, distanceR));
if (smallest < range) {
pixColor[3] = pixColor[3] * pow((smallest / range), shadowPower);
}
}
if (pixColor[3] == 0.0) {
discard; return;
}
// premultiply
pixColor.rgb *= pixColor[3];
if (skipCM == 0)
pixColor = doColorManagement(pixColor, sourceTF, targetTF, targetPrimaries);
fragColor = pixColor;
}
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