src/cobalt/renderer/glimp_shaders/glsl/fragment_skia_quad_with_derivatives.glsl

#version 100

#extension GL_OES_standard_derivatives : require
precision mediump float;
varying mediump vec4 vQuadEdge_Stage0;
varying mediump vec4 vinColor_Stage0;
void main() {
    vec4 outputCoverage_Stage0;
    {
        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);
        }
        outputCoverage_Stage0 = vec4(edgeAlpha);
    }
    {
        gl_FragColor = outputCoverage_Stage0;
    }
}