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44 lines
1.3 KiB
GLSL
44 lines
1.3 KiB
GLSL
#version 410 core
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//SpriteBatch will use texture unit 0
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uniform sampler2D u_texture;
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uniform vec2 u_screenResolution;
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uniform vec2 u_lightCoord[50];
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uniform float u_lightIntensity[50];
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uniform int u_actualLights;
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//"in" varyings from our vertex shader
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varying vec4 vColor;
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varying vec2 vTexCoord;
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float getDistance(float x1, float y1, float x2, float y2){
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float dx = x2 - x1;
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float dy = y2 - y1;
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float dis = sqrt(dx * dx + dy * dy);
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return dis;
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}
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void main() {
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//sample the texture
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vec4 texColor = texture2D(u_texture, vTexCoord);
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float dis = getDistance(u_screenResolution.x / 2.0, u_screenResolution.y / 2.0, gl_FragCoord.x, gl_FragCoord.y);
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float disFull = getDistance(u_screenResolution.x / 2.0, u_screenResolution.y / 2.0, 0, 0);
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float disSq = (1-(dis / disFull));
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//Distance is measured in pixels
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float brightest = 0;
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for(int i = 0;i < u_actualLights;i++){
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float dis2Light = getDistance(gl_FragCoord.x, gl_FragCoord.y, u_lightCoord[i].x, u_lightCoord[i].y);
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float dis2Light2 = (1-(min(dis2Light/(disFull * u_lightIntensity[i]), 1)));
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brightest = brightest + dis2Light2 - brightest * dis2Light2;
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}
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texColor.rgb = texColor.rgb * (pow(brightest, 10));
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//final color
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gl_FragColor = texColor * vColor;
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}
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