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out vec4 outcolor;
in vec2 frag_texture_coord;
uniform sampler2D source;
uniform vec2 resolution;
uniform vec2 src_image_size;
void main() {
// Match CRT shader coordinate system exactly
vec2 half_pixel = 0.5 / src_image_size;
vec2 fragCoord = vec2(frag_texture_coord.x, 1.0 - frag_texture_coord.y) + half_pixel;
// Convert to pixel coordinates and add pixel centering offset
vec2 ipos = fragCoord * resolution + vec2(0.5);
// Convert to normalized device coordinates [-1, 1]
vec2 pos = ipos * (2.0 / resolution) - vec2(1.0);
// Apply barrel distortion (match CRT warp)
vec2 warp = vec2(1.0 / 24.0, 1.0 / 16.0);
pos *= vec2(
1.0 + (pos.y * pos.y) * warp.x,
1.0 + (pos.x * pos.x) * warp.y
);
// Convert back to UV coordinates
vec2 uv = (pos + vec2(1.0)) * 0.5;
// Sample from source with boundary check
if (uv.x < 0.0 || uv.x > 1.0 || uv.y < 0.0 || uv.y > 1.0) {
outcolor = vec4(0.0, 0.0, 0.0, 1.0);
} else {
// Sample directly (Y-flip already applied at line 11)
outcolor = texture(source, uv, -16.0);
}
}
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