58 lines
1.3 KiB
GLSL
58 lines
1.3 KiB
GLSL
#ifndef SELECT_EDGES
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uniform vec3 wireColor;
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uniform vec3 rimColor;
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flat in vec3 ssVec0;
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flat in vec3 ssVec1;
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flat in vec3 ssVec2;
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in float facing;
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# ifdef LIGHT_EDGES
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flat in vec3 edgeSharpness;
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# endif
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out vec4 fragColor;
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#endif
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float min_v3(vec3 v) { return min(v.x, min(v.y, v.z)); }
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float max_v3(vec3 v) { return max(v.x, max(v.y, v.z)); }
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/* In pixels */
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const float wire_size = 0.0; /* Expands the core of the wire (part that is 100% wire color) */
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const float wire_smooth = 1.2; /* Smoothing distance after the 100% core. */
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/* Alpha constants could be exposed in the future. */
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const float front_alpha = 0.35;
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const float rim_alpha = 0.75;
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void main()
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{
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#ifndef SELECT_EDGES
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vec3 ss_pos = vec3(gl_FragCoord.xy, 1.0);
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vec3 dist_to_edge = vec3(
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dot(ss_pos, ssVec0),
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dot(ss_pos, ssVec1),
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dot(ss_pos, ssVec2)
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);
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# ifdef LIGHT_EDGES
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vec3 fac = abs(dist_to_edge);
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# else
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float fac = min_v3(abs(dist_to_edge));
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# endif
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fac = smoothstep(wire_size + wire_smooth, wire_size, fac);
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float facing_clamped = clamp((gl_FrontFacing) ? facing : -facing, 0.0, 1.0);
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vec3 final_front_col = mix(rimColor, wireColor, 0.05);
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fragColor = mix(vec4(rimColor, rim_alpha), vec4(final_front_col, front_alpha), facing_clamped);
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# ifdef LIGHT_EDGES
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fragColor.a *= max_v3(fac * edgeSharpness);
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# else
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fragColor.a *= fac;
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# endif
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#endif
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}
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