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// ----------------------------------------------------------------------------
// Copyright (c) 2014, Nicolas P. Rougier. All Rights Reserved.
// Distributed under the (new) BSD License.
// ----------------------------------------------------------------------------
#include "math/constants.glsl"
#include "misc/viewport-NDC.glsl"
// Externs
// ------------------------------------
// vec2 position;
// vec2 texcoord;
// float scale;
// vec3 origin;
// vec3 direction
// vec4 color;
// Varyings
// ------------------------------------
varying float v_scale;
varying vec2 v_texcoord;
varying vec4 v_color;
// Main
// ------------------------------------
void main()
{
fetch_uniforms();
vec3 up = vec3(0,0,-1);
// Untransformed normalized tangent and orhogonal directions
vec3 tangent = normalize(direction.xyz);
vec3 ortho = normalize(cross(tangent, up));
vec3 P1 = origin + scale*(tangent*position.x + ortho*position.y);
vec4 P1_ = <transform(P1)>;
vec2 p1 = NDC_to_viewport(P1_, <viewport.viewport_global>.zw);
// This compute an estimation of the actual size of the glyph
vec3 P2 = origin + scale*(tangent*(position.x+64.0) + ortho*(position.y));
vec4 P2_ = <transform(P2)>;
vec2 p2 = NDC_to_viewport(P2_, <viewport.viewport_global>.zw);
vec3 P3 = origin + scale*(tangent*(position.x) + ortho*(position.y+64.0));
vec4 P3_ = <transform(P3)>;
vec2 p3 = NDC_to_viewport(P3_, <viewport.viewport_global>.zw);
float d2 = length(p2 - p1);
float d3 = length(p3 - p1);
v_scale = min(d2,d3);
gl_Position = P1_;
v_texcoord = texcoord;
v_color = color;
<viewport.transform>;
}
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