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// ----------------------------------------------------------------------------
// Copyright (c) 2014, Nicolas P. Rougier. All Rights Reserved.
// Distributed under the (new) BSD License.
// ----------------------------------------------------------------------------
#version 120
// Constants
// ------------------------------------
const float SQRT_2 = 1.4142135623730951;
// Uniforms
// ------------------------------------
uniform sampler2D u_texture;
uniform vec2 u_texture_shape;
// Varyings
// ------------------------------------
varying float v_antialias;
varying float v_linewidth;
varying vec4 v_fg_color;
varying vec4 v_bg_color;
varying float v_size;
varying vec2 v_rotation;
vec4 Nearest(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Bilinear(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Hanning(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Hamming(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Hermite(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Kaiser(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Quadric(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Bicubic(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 CatRom(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Mitchell(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Spline16(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Spline36(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Gaussian(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Bessel(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Sinc(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Lanczos(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
vec4 Blackman(sampler2D u_data, vec2 u_shape, vec2 v_texcoord);
void main()
{
vec2 P = gl_PointCoord.xy - vec2(0.5,0.5);
P = vec2(v_rotation.x*P.x - v_rotation.y*P.y,
v_rotation.y*P.x + v_rotation.x*P.y);
P += vec2(0.5,0.5);
float r = v_size + 2*(v_linewidth + 1.5*v_antialias);
// float signed_distance = r * (texture2D(u_texture, P).r - 0.5);
float signed_distance = r * (Bicubic(u_texture, u_texture_shape, P).r - 0.5);
float t = v_linewidth/2.0 - v_antialias;
float border_distance = abs(signed_distance) - t;
float alpha = border_distance/v_antialias;
alpha = exp(-alpha*alpha);
// Within linestroke
if( border_distance < 0 )
gl_FragColor = v_fg_color;
else if( signed_distance < 0 )
// Inside shape
if( border_distance > (v_linewidth/2.0 + v_antialias) )
gl_FragColor = v_bg_color;
else // Line stroke interior border
gl_FragColor = mix(v_bg_color,v_fg_color,alpha);
else
// Outide shape
if( border_distance > (v_linewidth/2.0 + v_antialias) )
discard;
else // Line stroke exterior border
gl_FragColor = vec4(v_fg_color.rgb, v_fg_color.a * alpha);
}
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