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24 lines
773 B
GLSL
24 lines
773 B
GLSL
// Warning! Beware to use this shader. "discard" command may significally reduce performance.
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// Unfortunately some CG algorithms cannot be implemented on OpenGL ES 2.0 without discarding
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// fragments from depth buffer.
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varying vec2 v_colorTexCoord;
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varying vec3 v_radius;
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uniform sampler2D u_colorTex;
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uniform float u_opacity;
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const float kAntialiasingThreshold = 0.92;
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void main()
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{
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vec4 color = texture2D(u_colorTex, v_colorTexCoord);
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float smallRadius = v_radius.z * kAntialiasingThreshold;
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float stepValue = smoothstep(smallRadius * smallRadius, v_radius.z * v_radius.z,
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v_radius.x * v_radius.x + v_radius.y * v_radius.y);
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color.a = u_opacity * (1.0 - stepValue);
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if (color.a < 0.01)
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discard;
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gl_FragColor = color;
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}
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