49 lines
1.5 KiB
GLSL
49 lines
1.5 KiB
GLSL
//modified version of [this shader](https://github.com/wessles/GLSL-CRT/blob/master/shader.frag)
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const vec3 VIB_RGB_BALANCE = vec3(1.0, 1.0, 1.0);
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const float VIB_VIBRANCE = 0.40;
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const vec3 VIB_coeffVibrance = VIB_RGB_BALANCE * -VIB_VIBRANCE;
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void windowShader(inout vec4 color) {
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vec2 texCoord = x_TexCoord;
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// Distance from the center
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float dx = abs(0.5-texCoord.x);
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float dy = abs(0.5-texCoord.y);
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// Square it to smooth the edges
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dx *= dx;
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dy *= dy;
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texCoord.x -= 0.5;
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texCoord.x *= 1.0 + (dy * 0.05);
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texCoord.x += 0.5;
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texCoord.y -= 0.5;
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texCoord.y *= 1.0 + (dx * 0.18);
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texCoord.y += 0.5;
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// Get texel, and add in scanline if need be
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color = x_Texture(texCoord);
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color.rgb += sin(texCoord.y * 1250.0) * 0.02;
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// Cutoff
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if(texCoord.y > 1.0 || texCoord.x < 0.0 || texCoord.x > 1.0 || texCoord.y < 0.0)
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color = vec4(0.0);
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// vec3 VIB_coefLuma = vec3(0.333333, 0.333334, 0.333333); // was for `if VIB_LUMA == 1`
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vec3 VIB_coefLuma = vec3(0.212656, 0.715158, 0.072186); // try both and see which one looks nicer.
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float luma = dot(VIB_coefLuma, color.rgb);
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float max_color = max(color.r, max(color.g, color.b));
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float min_color = min(color.r, min(color.g, color.b));
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float color_saturation = max_color - min_color;
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vec3 p_col = vec3(vec3(vec3(vec3(sign(VIB_coeffVibrance) * color_saturation) - 1.0) * VIB_coeffVibrance) + 1.0);
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color.r = mix(luma, color.r, p_col.r);
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color.g = mix(luma, color.g, p_col.g);
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color.b = mix(luma, color.b, p_col.b);
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}
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