| #version 100 |
| |
| #extension GL_OES_standard_derivatives : require |
| precision mediump float; |
| varying mediump vec2 vEllipseOffsets0_Stage0; |
| varying mediump vec2 vEllipseOffsets1_Stage0; |
| varying mediump vec4 vinColor_Stage0; |
| void main() { |
| vec4 outputColor_Stage0; |
| vec4 outputCoverage_Stage0; |
| { |
| outputColor_Stage0 = vinColor_Stage0; |
| vec2 scaledOffset = vEllipseOffsets0_Stage0.xy; |
| float test = dot(scaledOffset, scaledOffset) - 1.0; |
| vec2 duvdx = dFdx(vEllipseOffsets0_Stage0); |
| vec2 duvdy = dFdy(vEllipseOffsets0_Stage0); |
| vec2 grad = vec2((2.0 * vEllipseOffsets0_Stage0.x) * duvdx.x + (2.0 * vEllipseOffsets0_Stage0.y) * duvdx.y, (2.0 * vEllipseOffsets0_Stage0.x) * duvdy.x + (2.0 * vEllipseOffsets0_Stage0.y) * duvdy.y); |
| float grad_dot = dot(grad, grad); |
| grad_dot = max(grad_dot, 0.0001); |
| float invlen = inversesqrt(grad_dot); |
| float edgeAlpha = clamp(0.5 - test * invlen, 0.0, 1.0); |
| outputCoverage_Stage0 = vec4(edgeAlpha); |
| } |
| { |
| gl_FragColor = outputColor_Stage0 * outputCoverage_Stage0; |
| } |
| } |