99 lines
3.2 KiB
GLSL
99 lines
3.2 KiB
GLSL
// -----------------------------------------------------------------------------
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// Copyright (c) 2009-2016 Nicolas P. Rougier. All rights reserved.
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// Distributed under the (new) BSD License.
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// -----------------------------------------------------------------------------
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// Hooks:
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// <transform> : vec4 function(position, ...)
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//
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// ----------------------------------------------------------------------------
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#include "misc/viewport-NDC.glsl"
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// Externs
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// ------------------------------------
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// extern vec3 prev;
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// extern vec3 curr;
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// extern vec3 next;
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// extern float id;
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// extern vec4 color;
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// extern float antialias;
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// extern float linewidth;
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// Varyings
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// ------------------------------------
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out float v_antialias;
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out float v_linewidth;
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out float v_distance;
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out vec4 v_color;
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// Main
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// ------------------------------------
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void main ()
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{
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// This function is externally generated
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// fetch_uniforms();
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v_linewidth = linewidth;
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v_antialias = antialias;
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v_color = color;
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// transform prev/curr/next
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// vec4 prev_ = <transform(prev)>;
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// vec4 curr_ = <transform(curr)>;
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// vec4 next_ = <transform(next)>;
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// prev/curr/next in viewport coordinates
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// vec2 _prev = NDC_to_viewport(prev_, <viewport.viewport_global>.zw);
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// vec2 _curr = NDC_to_viewport(curr_, <viewport.viewport_global>.zw);
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// vec2 _next = NDC_to_viewport(next_, <viewport.viewport_global>.zw);
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// Compute vertex final position (in viewport coordinates)
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float w = linewidth/2.0 + 1.5*antialias;
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float z;
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vec2 P;
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// if( curr == prev) {
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// vec2 v = normalize(_next.xy - _curr.xy);
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// vec2 normal = normalize(vec2(-v.y,v.x));
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// P = _curr.xy + normal*w*id;
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// } else if (curr == next) {
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// vec2 v = normalize(_curr.xy - _prev.xy);
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// vec2 normal = normalize(vec2(-v.y,v.x));
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// P = _curr.xy + normal*w*id;
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// } else {
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// vec2 v0 = normalize(_curr.xy - _prev.xy);
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// vec2 v1 = normalize(_next.xy - _curr.xy);
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// vec2 normal = normalize(vec2(-v0.y,v0.x));
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// vec2 tangent = normalize(v0+v1);
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// vec2 miter = vec2(-tangent.y, tangent.x);
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// float l = abs(w / dot(miter,normal));
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// P = _curr.xy + miter*l*sign(id);
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// }
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if( curr == prev) {
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vec2 v = normalize(next.xy - curr.xy);
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vec2 normal = normalize(vec2(-v.y,v.x));
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P = curr.xy + normal*w*id;
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} else if (curr == next) {
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vec2 v = normalize(curr.xy - prev.xy);
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vec2 normal = normalize(vec2(-v.y,v.x));
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P = curr.xy + normal*w*id;
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} else {
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vec2 v0 = normalize(curr.xy - prev.xy);
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vec2 v1 = normalize(next.xy - curr.xy);
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vec2 normal = normalize(vec2(-v0.y,v0.x));
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vec2 tangent = normalize(v0+v1);
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vec2 miter = vec2(-tangent.y, tangent.x);
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float l = abs(w / dot(miter,normal));
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P = curr.xy + miter*l*sign(id);
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}
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if( abs(id) > 1.5 ) v_color.a = 0.0;
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v_distance = w*id;
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// gl_Position = viewport_to_NDC(P, <viewport.viewport_global>.zw, curr_.z / curr_.w);
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// gl_Position = curr.xy + miter * l * sign(id);
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gl_Position = vec4(P , 0.0, 1.0);
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// <viewport.transform()>;
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} |