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Contents
#extension GL_OES_standard_derivatives : enable
uniform vec4 color;
varying float v_width;
float getPointOnLine(vec2 p0, vec2 p1, float x)
{
float slope = (p0.y - p1.y) / (p0.x - p1.x);
return slope * (x - p0.x) + p0.y;
}
czm_material czm_getMaterial(czm_materialInput materialInput)
{
czm_material material = czm_getDefaultMaterial(materialInput);
vec2 st = materialInput.st;
float base = 1.0 - abs(fwidth(st.s)) * 10.0;
vec2 center = vec2(1.0, 0.5);
float ptOnUpperLine = getPointOnLine(vec2(base, 1.0), center, st.s);
float ptOnLowerLine = getPointOnLine(vec2(base, 0.0), center, st.s);
float halfWidth = 0.15;
float s = step(0.5 - halfWidth, st.t);
s *= 1.0 - step(0.5 + halfWidth, st.t);
s *= 1.0 - step(base, st.s);
float t = step(base, materialInput.st.s);
t *= 1.0 - step(ptOnUpperLine, st.t);
t *= step(ptOnLowerLine, st.t);
// Find the distance from the closest separator (region between two colors)
float dist;
if (st.s < base)
{
float d1 = abs(st.t - (0.5 - halfWidth));
float d2 = abs(st.t - (0.5 + halfWidth));
dist = min(d1, d2);
}
else
{
float d1 = czm_infinity;
if (st.t < 0.5 - halfWidth && st.t > 0.5 + halfWidth)
{
d1 = abs(st.s - base);
}
float d2 = abs(st.t - ptOnUpperLine);
float d3 = abs(st.t - ptOnLowerLine);
dist = min(min(d1, d2), d3);
}
vec4 outsideColor = vec4(0.0);
vec4 currentColor = mix(outsideColor, color, clamp(s + t, 0.0, 1.0));
vec4 outColor = czm_antialias(outsideColor, color, currentColor, dist);
material.diffuse = outColor.rgb;
material.alpha = outColor.a;
return material;
}
Version data entries
15 entries across 15 versions & 1 rubygems