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Optimised line intersection by adding two simple prechecks. #14

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Optimised line intersection by adding two simple prechecks. #14

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18 changes: 18 additions & 0 deletions src/pygame_light2d/fragment_light.glsl
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,24 @@ vec2 uv_to_world(vec2 v){
}

bool isOcluded(vec2 p,vec2 q){
float x1 = min(p.x, q.x);
float w1 = abs(p.x - q.x);
float x2 = min(fragmentTexCoord.x, lightPos.x);
float w2 = abs(fragmentTexCoord.x - lightPos.x);

if(x1+w1<x2 || x2+w2<x1){
return false; //The lines cant intersect because their images on the x-axis dont intersect
}

float y1 = min(p.y, q.y);
float h1 = abs(p.y - q.y);
float y2 = min(fragmentTexCoord.y, lightPos.y);
float h2 = abs(fragmentTexCoord.y - lightPos.y);

if(y1+h1<y2 || y2+h2<y1){
return false; //The lines cant intersect because their images on the y-axis dont intersect
}

vec2 v1=q-p;
vec2 v2=lightPos-fragmentTexCoord;

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