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// ----------------------------------------------------------------------------
// Copyright (c) 2014, Nicolas P. Rougier. All Rights Reserved.
// Distributed under the (new) BSD License.
// ----------------------------------------------------------------------------
// Hooks:
// <transform> : vec4 function(position, ...)
//
// ----------------------------------------------------------------------------
#include "misc/viewport-NDC.glsl"
// Externs
// ------------------------------------
// extern vec3 P0;
// extern vec3 P1;
// extern float index;
// extern vec4 color;
// extern float antialias;
// extern float linewidth;
// extern vec4 viewport;
// vec4 transform(vec3 position);
// Varyings
// ------------------------------------
varying float v_length;
varying float v_antialias;
varying float v_linewidth;
varying vec2 v_texcoord;
varying vec4 v_color;
// Main
// ------------------------------------
void main (void)
{
// This function is externally generated
fetch_uniforms();
v_linewidth = linewidth;
v_antialias = antialias;
v_color = color;
vec4 P0_ = $transform(vec4(P0, 1));
vec4 P1_ = $transform(vec4(P1, 1));
// p0/p1 in viewport coordinates
vec2 p0 = NDC_to_viewport(P0_, viewport.zw);
vec2 p1 = NDC_to_viewport(P1_, viewport.zw);
//
vec2 position;
vec2 T = p1 - p0;
v_length = length(T);
float w = v_linewidth/2.0 + 1.5*v_antialias;
T = w*normalize(T);
float z;
if( index < 0.5 ) {
position = vec2( p0.x-T.y-T.x, p0.y+T.x-T.y);
v_texcoord = vec2(-w, +w);
z = P0.z;
} else if( index < 1.5 ) {
position = vec2(p0.x+T.y-T.x, p0.y-T.x-T.y);
v_texcoord= vec2(-w, -w);
z = P0.z;
} else if( index < 2.5 ) {
position = vec2( p1.x+T.y+T.x, p1.y-T.x+T.y);
v_texcoord= vec2(v_length+w, -w);
z = P1.z;
} else {
position = vec2( p1.x-T.y+T.x, p1.y+T.x+T.y);
v_texcoord = vec2(v_length+w, +w);
z = P1.z;
}
gl_Position = viewport_to_NDC(vec3(position,z), viewport.zw);
}
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