mirror of https://github.com/LIJI32/SameBoy.git
76 lines
2.7 KiB
GLSL
76 lines
2.7 KiB
GLSL
STATIC vec4 scale2x(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
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{
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// texel arrangement
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// A B C
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// D E F
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// G H I
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vec4 B = texture_relative(image, position, vec2( 0, 1));
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vec4 D = texture_relative(image, position, vec2( -1, 0));
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vec4 E = texture_relative(image, position, vec2( 0, 0));
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vec4 F = texture_relative(image, position, vec2( 1, 0));
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vec4 H = texture_relative(image, position, vec2( 0, -1));
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vec2 p = position * input_resolution;
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// p = the position within a pixel [0...1]
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p = fract(p);
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if (p.x > .5) {
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if (p.y > .5) {
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// Top Right
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return equal(B, F) && inequal(B, D) && inequal(F, H) ? F : E;
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} else {
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// Bottom Right
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return equal(H, F) && inequal(D, H) && inequal(B, F) ? F : E;
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}
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} else {
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if (p.y > .5) {
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// Top Left
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return equal(D, B) && inequal(B, F) && inequal(D, H) ? D : E;
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} else {
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// Bottom Left
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return equal(D, H) && inequal(D, B) && inequal(H, F) ? D : E;
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}
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}
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}
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STATIC vec4 scale2x_wrapper(sampler2D t, vec2 pos, vec2 offset, vec2 input_resolution, vec2 output_resolution)
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{
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vec2 origin = (floor(pos * input_resolution * 2)) + vec2(0.5, 0.5);
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return scale2x(t, (origin + offset) / input_resolution / 2, input_resolution, output_resolution);
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}
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STATIC vec4 scale(sampler2D image, vec2 position, vec2 input_resolution, vec2 output_resolution)
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{
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// texel arrangement
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// A B C
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// D E F
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// G H I
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vec4 B = scale2x_wrapper(image, position, vec2( 0, 1), input_resolution, output_resolution);
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vec4 D = scale2x_wrapper(image, position, vec2( -1, 0), input_resolution, output_resolution);
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vec4 E = scale2x_wrapper(image, position, vec2( 0, 0), input_resolution, output_resolution);
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vec4 F = scale2x_wrapper(image, position, vec2( 1, 0), input_resolution, output_resolution);
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vec4 H = scale2x_wrapper(image, position, vec2( 0, -1), input_resolution, output_resolution);
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vec4 R;
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vec2 p = position * input_resolution * 2.;
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// p = the position within a pixel [0...1]
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p = fract(p);
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if (p.x > .5) {
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if (p.y > .5) {
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// Top Right
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R = equal(B, F) && inequal(B, D) && inequal(F, H) ? F : E;
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} else {
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// Bottom Right
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R = equal(H, F) && inequal(D, H) && inequal(B, F) ? F : E;
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}
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} else {
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if (p.y > .5) {
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// Top Left
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R = equal(D, B) && inequal(B, F) && inequal(D, H) ? D : E;
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} else {
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// Bottom Left
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R = equal(D, H) && inequal(D, B) && inequal(H, F) ? D : E;
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}
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}
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return mix(R, E, 0.5);
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}
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