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in vec4 fragTexCoord;
out vec4 fragOut0;
uniform sampler2D scene;
uniform sampler2D cockpit;
layout (std140) uniform genericData {
vec2 sun_pos;
float density;
float weight;
float falloff;
float intensity;
float cp_intensity;
};
void main()
{
vec2 step = vec2( fragTexCoord.st - sun_pos.xy );
vec2 pos = fragTexCoord.st;
step *= 1.0 / float(SAMPLE_NUM) * density;
float decay = 1.0;
vec4 sum = vec4(0.0);
vec4 mask = texture(cockpit, fragTexCoord.st);
if (mask.r < 1.0) {
fragOut0 = vec4(cp_intensity);
return;
}
for(int i=0; i < SAMPLE_NUM ; i++) {
pos.st -= step;
vec4 tex_sample = texture(scene, pos);
if (tex_sample.r == 1.0)
sum += decay * weight;
decay *= falloff;
}
fragOut0 = sum * intensity;
fragOut0.a = 1.0;
}
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