dust3d/thirdparty/instant-meshes/instant-meshes-dust3d/resources/shader_singularity.frag

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#version 330
precision lowp float;
in fData {
vec3 color;
vec2 texcoord;
vec2 dir1, dir2;
} frag;
out vec4 outColor;
void main() {
if (length(frag.texcoord.xy-vec2(0.5)) > 0.5)
discard;
vec3 col = frag.color;
float size = 0.5;
if (frag.dir1 != vec2(0.0) && frag.dir2 != vec2(0.0))
size = 0.35;
if (frag.dir1 != vec2(0.0) && abs(atan(frag.dir1.y, frag.dir1.x)) < size)
col = vec3(0.0);
if (frag.dir2 != vec2(0.0) && abs(atan(frag.dir2.y, frag.dir2.x)) < size)
col = vec3(0.0);
outColor = vec4(col, 1.0);
}