blob: f2b934313b4269e834bcdb8267fadcfbd033280b [file] [log] [blame]
#version 100
#extension GL_OES_standard_derivatives: require
precision mediump float;
varying vec4 vColor;
varying vec4 vQuadEdge_Stage0;
void main() {
vec4 output_Stage0;
{
// Stage 0: QuadEdge
float edgeAlpha;
vec2 duvdx = dFdx(vQuadEdge_Stage0.xy);
vec2 duvdy = dFdy(vQuadEdge_Stage0.xy);
if (vQuadEdge_Stage0.z > 0.0 && vQuadEdge_Stage0.w > 0.0) {
edgeAlpha = min(min(vQuadEdge_Stage0.z, vQuadEdge_Stage0.w) + 0.5, 1.0);
} else {
vec2 gF = vec2(2.0*vQuadEdge_Stage0.x*duvdx.x - duvdx.y,
2.0*vQuadEdge_Stage0.x*duvdy.x - duvdy.y);
edgeAlpha = (vQuadEdge_Stage0.x*vQuadEdge_Stage0.x - vQuadEdge_Stage0.y);
edgeAlpha = clamp(0.5 - edgeAlpha / length(gF), 0.0, 1.0);
}
output_Stage0 = vec4(edgeAlpha);
}
gl_FragColor = (vColor * output_Stage0);
}