cesiumDemo/Source/Shaders/Materials/PolylineArrowMaterial.js

//This file is automatically rebuilt by the Cesium build process.
export default "#ifdef GL_OES_standard_derivatives\n\
#extension GL_OES_standard_derivatives : enable\n\
#endif\n\
uniform vec4 color;\n\
varying float v_width;\n\
float getPointOnLine(vec2 p0, vec2 p1, float x)\n\
{\n\
float slope = (p0.y - p1.y) / (p0.x - p1.x);\n\
return slope * (x - p0.x) + p0.y;\n\
}\n\
czm_material czm_getMaterial(czm_materialInput materialInput)\n\
{\n\
czm_material material = czm_getDefaultMaterial(materialInput);\n\
vec2 st = materialInput.st;\n\
#ifdef GL_OES_standard_derivatives\n\
float base = 1.0 - abs(fwidth(st.s)) * 10.0 * czm_pixelRatio;\n\
#else\n\
float base = 0.975;\n\
#endif\n\
vec2 center = vec2(1.0, 0.5);\n\
float ptOnUpperLine = getPointOnLine(vec2(base, 1.0), center, st.s);\n\
float ptOnLowerLine = getPointOnLine(vec2(base, 0.0), center, st.s);\n\
float halfWidth = 0.15;\n\
float s = step(0.5 - halfWidth, st.t);\n\
s *= 1.0 - step(0.5 + halfWidth, st.t);\n\
s *= 1.0 - step(base, st.s);\n\
float t = step(base, materialInput.st.s);\n\
t *= 1.0 - step(ptOnUpperLine, st.t);\n\
t *= step(ptOnLowerLine, st.t);\n\
float dist;\n\
if (st.s < base)\n\
{\n\
float d1 = abs(st.t - (0.5 - halfWidth));\n\
float d2 = abs(st.t - (0.5 + halfWidth));\n\
dist = min(d1, d2);\n\
}\n\
else\n\
{\n\
float d1 = czm_infinity;\n\
if (st.t < 0.5 - halfWidth && st.t > 0.5 + halfWidth)\n\
{\n\
d1 = abs(st.s - base);\n\
}\n\
float d2 = abs(st.t - ptOnUpperLine);\n\
float d3 = abs(st.t - ptOnLowerLine);\n\
dist = min(min(d1, d2), d3);\n\
}\n\
vec4 outsideColor = vec4(0.0);\n\
vec4 currentColor = mix(outsideColor, color, clamp(s + t, 0.0, 1.0));\n\
vec4 outColor = czm_antialias(outsideColor, color, currentColor, dist);\n\
outColor = czm_gammaCorrect(outColor);\n\
material.diffuse = outColor.rgb;\n\
material.alpha = outColor.a;\n\
return material;\n\
}\n\
";