mirror of
https://github.com/Ttanasart-pt/Pixel-Composer.git
synced 2024-12-25 14:36:13 +01:00
73 lines
2.5 KiB
GLSL
73 lines
2.5 KiB
GLSL
//
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// Simple passthrough fragment shader
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//
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varying vec2 v_vTexcoord;
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varying vec4 v_vColour;
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//Texel size (1/resolution)
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uniform vec2 dimension;
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uniform float cornerDis;
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uniform float mixAmo;
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#define SPAN_MAX (8.0) //Maximum texel span
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//These are more technnical and probably don't need changing:
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#define REDUCE_MIN (1.0 / 128.0) //Minimum "dir" reciprocal
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#define REDUCE_MUL (1.0 / 32.0) //Luma multiplier for "dir" reciprocal
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vec4 textureFXAA(sampler2D tex, vec2 uv) {
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vec2 u_texel = 1. / dimension;
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//Sample center and 4 corners
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vec3 rgbCC = texture2D(tex, uv).rgb;
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vec3 rgb00 = texture2D(tex, uv + vec2( -cornerDis, -cornerDis) * u_texel).rgb;
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vec3 rgb10 = texture2D(tex, uv + vec2( +cornerDis, -cornerDis) * u_texel).rgb;
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vec3 rgb01 = texture2D(tex, uv + vec2( -cornerDis, +cornerDis) * u_texel).rgb;
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vec3 rgb11 = texture2D(tex, uv + vec2( +cornerDis, +cornerDis) * u_texel).rgb;
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//Luma coefficients
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const vec3 luma = vec3(0.299, 0.587, 0.114);
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//Get luma from the 5 samples
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float lumaCC = dot(rgbCC, luma);
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float luma00 = dot(rgb00, luma);
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float luma10 = dot(rgb10, luma);
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float luma01 = dot(rgb01, luma);
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float luma11 = dot(rgb11, luma);
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//Compute gradient from luma values
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vec2 dir = vec2((luma01 + luma11) - (luma00 + luma10), (luma00 + luma01) - (luma10 + luma11));
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//Diminish dir length based on total luma
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float dirReduce = max((luma00 + luma10 + luma01 + luma11) * REDUCE_MUL, REDUCE_MIN);
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//Divide dir by the distance to nearest edge plus dirReduce
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float rcpDir = 1.0 / (min(abs(dir.x), abs(dir.y)) + dirReduce);
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//Multiply by reciprocal and limit to pixel span
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dir = clamp(dir * rcpDir, -SPAN_MAX, SPAN_MAX) * u_texel.xy;
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vec4 O = texture2D(tex, uv);
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//Average middle texels along dir line
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vec4 A = 0.5 * (
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texture2D(tex, uv - dir * (1.0 / 6.0)) +
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texture2D(tex, uv + dir * (1.0 / 6.0)));
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//Average with outer texels along dir line
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vec4 B = A * 0.5 + 0.25 * (
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texture2D(tex, uv - dir * (0.5)) +
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texture2D(tex, uv + dir * (0.5)));
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//Get lowest and highest luma values
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float lumaMin = min(lumaCC, min(min(luma00, luma10), min(luma01, luma11)));
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float lumaMax = max(lumaCC, max(max(luma00, luma10), max(luma01, luma11)));
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//Get average luma
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float lumaB = dot(B.rgb, luma);
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//If the average is outside the luma range, using the middle average
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return mix(O, ((lumaB < lumaMin) || (lumaB > lumaMax)) ? A : B, mixAmo);
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}
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void main() {
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gl_FragColor = textureFXAA( gm_BaseTexture, v_vTexcoord );
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}
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