71 lines
3.4 KiB
GLSL
71 lines
3.4 KiB
GLSL
#define COLOR_LOW 0.8
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#define COLOR_HIGH 1.0
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#define SCANLINE_DEPTH 0.1
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vec4 scale(sampler2D image)
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{
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vec2 texCoord = vec2(gl_FragCoord.x, uResolution.y - gl_FragCoord.y) / uResolution;
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vec2 pos = fract(texCoord * textureDimensions);
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vec2 sub_pos = fract(texCoord * textureDimensions * 6);
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vec4 center = texture(image, texCoord);
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vec4 left = texture(image, texCoord - vec2(1.0 / textureDimensions.x, 0));
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vec4 right = texture(image, texCoord + vec2(1.0 / textureDimensions.x, 0));
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if (pos.y < 1.0 / 6.0) {
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center = mix(center, texture(image, texCoord + vec2(0, -1.0 / textureDimensions.y)), 0.5 - sub_pos.y / 2.0);
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left = mix(left, texture(image, texCoord + vec2(-1.0 / textureDimensions.x, -1.0 / textureDimensions.y)), 0.5 - sub_pos.y / 2.0);
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right = mix(right, texture(image, texCoord + vec2( 1.0 / textureDimensions.x, -1.0 / textureDimensions.y)), 0.5 - sub_pos.y / 2.0);
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center *= sub_pos.y * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
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left *= sub_pos.y * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
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right *= sub_pos.y * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
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}
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else if (pos.y > 5.0 / 6.0) {
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center = mix(center, texture(image, texCoord + vec2(0, 1.0 / textureDimensions.y)), sub_pos.y / 2.0);
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left = mix(left, texture(image, texCoord + vec2(-1.0 / textureDimensions.x, 1.0 / textureDimensions.y)), sub_pos.y / 2.0);
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right = mix(right, texture(image, texCoord + vec2( 1.0 / textureDimensions.x, 1.0 / textureDimensions.y)), sub_pos.y / 2.0);
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center *= (1.0 - sub_pos.y) * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
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left *= (1.0 - sub_pos.y) * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
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right *= (1.0 - sub_pos.y) * SCANLINE_DEPTH + (1 - SCANLINE_DEPTH);
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}
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vec4 midleft = mix(left, center, 0.5);
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vec4 midright = mix(right, center, 0.5);
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vec4 ret;
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if (pos.x < 1.0 / 6.0) {
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ret = mix(vec4(COLOR_HIGH * center.r, COLOR_LOW * center.g, COLOR_HIGH * left.b, 1),
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vec4(COLOR_HIGH * center.r, COLOR_LOW * center.g, COLOR_LOW * left.b, 1),
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sub_pos.x);
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}
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else if (pos.x < 2.0 / 6.0) {
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ret = mix(vec4(COLOR_HIGH * center.r, COLOR_LOW * center.g, COLOR_LOW * left.b, 1),
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vec4(COLOR_HIGH * center.r, COLOR_HIGH * center.g, COLOR_LOW * midleft.b, 1),
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sub_pos.x);
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}
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else if (pos.x < 3.0 / 6.0) {
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ret = mix(vec4(COLOR_HIGH * center.r , COLOR_HIGH * center.g, COLOR_LOW * midleft.b, 1),
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vec4(COLOR_LOW * midright.r, COLOR_HIGH * center.g, COLOR_LOW * center.b, 1),
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sub_pos.x);
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}
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else if (pos.x < 4.0 / 6.0) {
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ret = mix(vec4(COLOR_LOW * midright.r, COLOR_HIGH * center.g , COLOR_LOW * center.b, 1),
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vec4(COLOR_LOW * right.r , COLOR_HIGH * center.g, COLOR_HIGH * center.b, 1),
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sub_pos.x);
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}
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else if (pos.x < 5.0 / 6.0) {
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ret = mix(vec4(COLOR_LOW * right.r, COLOR_HIGH * center.g , COLOR_HIGH * center.b, 1),
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vec4(COLOR_LOW * right.r, COLOR_LOW * midright.g, COLOR_HIGH * center.b, 1),
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sub_pos.x);
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}
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else {
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ret = mix(vec4(COLOR_LOW * right.r, COLOR_LOW * midright.g, COLOR_HIGH * center.b, 1),
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vec4(COLOR_HIGH * right.r, COLOR_LOW * right.g , COLOR_HIGH * center.b, 1),
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sub_pos.x);
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}
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return ret;
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}
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