27 lines
No EOL
579 B
Text
27 lines
No EOL
579 B
Text
#extension GL_OES_standard_derivatives : enable
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precision mediump float;
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in vec2 uv;
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in vec4 type_color;
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out vec4 color;
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void main(){
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float x = (uv.x - 0.5) * 2.0;
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float y = (uv.y - 0.5) * 2.0;
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float r_squared = x * x + y * y;
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float alpha = 1.0;
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#ifdef GL_OES_standard_derivatives
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float delta = fwidth(r_squared);
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alpha = 1.0 - smoothstep(1.0 - delta, 1.0 + delta, r_squared);
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color = vec4(type_color.rgb, alpha);
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#else
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if (r_squared <= 1.0){
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color = type_color;
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}
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else{
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color = vec4(0.0, 0.0, 0.0, 0.0);
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}
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#endif
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} |