48 lines
1.6 KiB
Text
48 lines
1.6 KiB
Text
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// Warning! Beware to use this shader. "discard" command may significally reduce performance.
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// Unfortunately some CG algorithms cannot be implemented without discarding fragments from depth buffer.
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layout (location = 0) in vec3 v_length;
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layout (location = 1) in vec4 v_color;
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layout (location = 0) out vec4 v_FragColor;
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layout (binding = 0) uniform UBO
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{
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mat4 u_modelView;
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mat4 u_projection;
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mat4 u_pivotTransform;
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vec4 u_routeParams;
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vec4 u_color;
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vec4 u_maskColor;
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vec4 u_outlineColor;
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vec4 u_fakeColor;
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vec4 u_fakeOutlineColor;
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vec2 u_fakeBorders;
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vec2 u_pattern;
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vec2 u_angleCosSin;
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float u_arrowHalfWidth;
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float u_opacity;
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};
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const float kAntialiasingThreshold = 0.92;
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const float kOutlineThreshold1 = 0.81;
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const float kOutlineThreshold2 = 0.71;
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void main()
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{
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if (v_length.x < v_length.z)
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discard;
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vec2 coefs = step(v_length.xx, u_fakeBorders);
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coefs.y = 1.0 - coefs.y;
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vec4 mainColor = mix(u_color, u_fakeColor, coefs.x);
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mainColor = mix(mainColor, u_fakeColor, coefs.y);
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vec4 mainOutlineColor = mix(u_outlineColor, u_fakeOutlineColor, coefs.x);
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mainOutlineColor = mix(mainOutlineColor, u_fakeOutlineColor, coefs.y);
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vec4 color = mix(mix(mainColor, vec4(v_color.rgb, 1.0), v_color.a), mainColor, step(u_routeParams.w, 0.0));
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color = mix(color, mainOutlineColor, step(kOutlineThreshold1, abs(v_length.y)));
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color = mix(color, mainOutlineColor, smoothstep(kOutlineThreshold2, kOutlineThreshold1, abs(v_length.y)));
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color.a *= (1.0 - smoothstep(kAntialiasingThreshold, 1.0, abs(v_length.y)));
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color = vec4(mix(color.rgb, u_maskColor.rgb, u_maskColor.a), color.a);
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v_FragColor = color;
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}
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