39 lines
936 B
Plaintext
39 lines
936 B
Plaintext
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vec4 pixelize(vec4 image, vec2 scaleVec, vec2 texCoord) {
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float scale = max(scaleVec.x, scaleVec.y);
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float x = fract(texCoord.x * 160.0) * scale;
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float y = fract(texCoord.y * 144.0) * scale;
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float border = 1.0;
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if (scale > 5.0) {
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border = 2.0;
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}
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if (x < border || x > scale - border || y < border || y > scale - border) {
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return vec4(.95, .95, .95, 1);
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}
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return image;
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}
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vec4 scale(sampler2D image) {
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vec2 displayScale = uResolution / vec2(160.0, 144.0);
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vec2 texCoord = vec2(gl_FragCoord.x, uResolution.y - gl_FragCoord.y) / uResolution;
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vec4 sampled = texture(image, texCoord);
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if (displayScale.x < 3.0 || displayScale.y < 3.0) {
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return sampled;
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}
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float mixValue = 1.0;
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if (displayScale.x >= 5.0 && displayScale.y >= 5.0) {
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mixValue = 0.5;
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}
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else if (displayScale.x >= 3.0 && displayScale.y >= 3.0) {
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mixValue = 0.8;
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}
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return mix(pixelize(sampled, displayScale, texCoord), sampled, mixValue);
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}
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