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Circles (GL points) anti-aliasing #268

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This commit is contained in:
Emux 2016-12-13 19:56:44 +02:00
parent c1a5ad7e74
commit 19109516ae
1 changed files with 6 additions and 2 deletions
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8
vtm/resources/assets/shaders/circle_point.glsl
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@ -11,6 +11,9 @@ void main() {
$$
#ifdef GL_OES_standard_derivatives
#extension GL_OES_standard_derivatives : enable
#endif
#ifdef GLES
precision highp float;
#endif
@ -18,6 +21,7 @@ uniform vec4 u_color;
void main() {
vec2 cxy = 2.0 * gl_PointCoord - 1.0;
float r = dot(cxy, cxy);
float len = 1.0 - length(r);
gl_FragColor = u_color * len;
float delta = fwidth(r);
float alpha = 1.0 - smoothstep(1.0 - delta, 1.0 + delta, r);
gl_FragColor = u_color * alpha;
}