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#version 300 es
// Sepia Tone Shader - OPTIMIZED
// Fixes: Clamping to prevent overflow on bright pixels
precision highp float;
in vec2 v_texcoord;
uniform sampler2D tex;
out vec4 fragColor;
// W3C standard Sepia Matrix (column-major for GLSL)
const mat3 SEPIA_MATRIX = mat3(
0.393, 0.769, 0.189, // Red output weights
0.349, 0.686, 0.168, // Green output weights
0.272, 0.534, 0.131 // Blue output weights
);
// Sepia intensity (0.0 = no effect, 1.0 = full sepia)
const float INTENSITY = 1.0;
void main() {
vec4 color = texture(tex, v_texcoord);
vec3 sepia = color.rgb * SEPIA_MATRIX;
// FIXED: Clamp to prevent overflow artifacts on bright pixels
sepia = clamp(sepia, 0.0, 1.0);
// Optional: blend with original for partial effect
vec3 final = mix(color.rgb, sepia, INTENSITY);
fragColor = vec4(final, color.a);
}
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