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out vec4 outcolor;
in vec2 frag_texture_coord;
uniform sampler2D source;
uniform float threshold;
// Bloom curve selection:
// 0 = Linear (default) - simple linear fade
// 1 = Smooth - smoothstep for more gradual fade-in
// 2 = Power - adjustable power curve
#define BLOOM_CURVE 0
void main() {
vec3 color = texture(source, frag_texture_coord).rgb;
// Calculate perceptual luminance
float brightness = dot(color, vec3(0.2126, 0.7152, 0.0722));
// Inverted bloom: full bloom at threshold and above, fades below threshold
// At brightness >= threshold: bloom_amount = 1.0 (full bloom)
// At brightness = 0: bloom_amount = 0.0 (no bloom)
float bloom_amount = min(brightness / threshold, 1.0);
#if BLOOM_CURVE == 1
// Smooth curve - more gradual fade-in using smoothstep
bloom_amount = smoothstep(0.0, 1.0, bloom_amount);
#elif BLOOM_CURVE == 2
// Power curve - adjust exponent for different feel
// < 1.0 = gentler fade, > 1.0 = steeper fade
bloom_amount = pow(bloom_amount, 0.7);
#endif
// BLOOM_CURVE == 0 uses linear (no modification needed)
outcolor = vec4(color * bloom_amount, 1.0);
}
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