| #version 100 |
| |
| uniform highp float u_skRTHeight; |
| precision mediump float; |
| uniform vec4 urect_Stage1; |
| uniform vec4 urect_Stage2; |
| uniform vec4 uinnerRect_Stage3; |
| uniform vec2 uinvRadiiXY_Stage3; |
| varying mediump vec4 vcolor_Stage0; |
| void main() { |
| highp vec2 _sktmpCoord = gl_FragCoord.xy; |
| highp vec4 sk_FragCoord = vec4(_sktmpCoord.x, u_skRTHeight - _sktmpCoord.y, 1.0, 1.0); |
| vec4 outputColor_Stage0; |
| { |
| outputColor_Stage0 = vcolor_Stage0; |
| } |
| vec4 output_Stage1; |
| { |
| float xSub, ySub; |
| xSub = min(sk_FragCoord.x - urect_Stage1.x, 0.0); |
| xSub += min(urect_Stage1.z - sk_FragCoord.x, 0.0); |
| ySub = min(sk_FragCoord.y - urect_Stage1.y, 0.0); |
| ySub += min(urect_Stage1.w - sk_FragCoord.y, 0.0); |
| float alpha = (1.0 + max(xSub, -1.0)) * (1.0 + max(ySub, -1.0)); |
| alpha = 1.0 - alpha; |
| output_Stage1 = vec4(alpha); |
| } |
| vec4 output_Stage2; |
| { |
| float xSub, ySub; |
| xSub = min(sk_FragCoord.x - urect_Stage2.x, 0.0); |
| xSub += min(urect_Stage2.z - sk_FragCoord.x, 0.0); |
| ySub = min(sk_FragCoord.y - urect_Stage2.y, 0.0); |
| ySub += min(urect_Stage2.w - sk_FragCoord.y, 0.0); |
| float alpha = (1.0 + max(xSub, -1.0)) * (1.0 + max(ySub, -1.0)); |
| output_Stage2 = output_Stage1 * alpha; |
| } |
| vec4 output_Stage3; |
| { |
| vec2 dxy0 = uinnerRect_Stage3.xy - sk_FragCoord.xy; |
| vec2 dxy1 = sk_FragCoord.xy - uinnerRect_Stage3.zw; |
| vec2 dxy = max(max(dxy0, dxy1), 0.0); |
| vec2 Z = dxy * uinvRadiiXY_Stage3.xy; |
| float implicit = dot(Z, dxy) - 1.0; |
| float grad_dot = 4.0 * dot(Z, Z); |
| grad_dot = max(grad_dot, 0.0001); |
| float approx_dist = implicit * inversesqrt(grad_dot); |
| float alpha = clamp(0.5 - approx_dist, 0.0, 1.0); |
| output_Stage3 = output_Stage2 * alpha; |
| } |
| { |
| gl_FragColor = outputColor_Stage0 * output_Stage3; |
| } |
| } |