OF_GLSL_SHADER_HEADER
precision mediump float;

uniform sampler2DRect tex0;  // Main texture
uniform sampler2D tex1;  // Bayer texture
uniform vec2 resolution;
uniform float time;
uniform int frame;

in vec2 varyingtexcoord;
out vec4 fragColor;

const float SIZE = 256.0;

const mat4 ditherMatrix = mat4(
    1.0/17.0, 9.0/17.0, 3.0/17.0, 11.0/17.0,
    13.0/17.0, 5.0/17.0, 15.0/17.0, 7.0/17.0,
    4.0/17.0, 12.0/17.0, 2.0/17.0, 10.0/17.0,
    16.0/17.0, 8.0/17.0, 14.0/17.0, 6.0/17.0
);

void main() {
    vec2 uv = varyingtexcoord / resolution;
    vec3 t = texture(tex0, varyingtexcoord).rgb;
    
    vec2 fragCoord = gl_FragCoord.xy;
    
    // color to display, use floating point precision here
    vec3 col = t;
    
    // Sample the Bayer 8x8 texture for the dither pattern
    float ditherValue = texture(tex1, fragCoord / 8.0).r;
    
    // Apply dithering with increased effect
    col += (ditherValue - 0.5) / 2.0 * 2.0;
    
    // Quantize the color
    col = (floor(col * 8.0) + 0.5) / 8.0;
    
    fragColor = vec4(col, 1.0);
}