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// ----------------------------------------------------------------------------
// Copyright (c) 2014, Nicolas P. Rougier. All Rights Reserved.
// Distributed under the (new) BSD License.
// ----------------------------------------------------------------------------
// Uniforms
// ------------------------------------
uniform sampler2D atlas_data;
uniform vec2 atlas_shape;
// Varyings
// ------------------------------------
varying vec4 v_color;
varying float v_offset;
varying vec2 v_texcoord;
// Main
// ------------------------------------
void main(void)
{
<viewport.clipping>;
vec2 viewport = <viewport.viewport_global>.zw;
vec4 current = texture2D(atlas_data, v_texcoord);
vec4 previous= texture2D(atlas_data, v_texcoord+vec2(-1.0,0.0)/viewport);
vec4 next = texture2D(atlas_data, v_texcoord+vec2(+1.0,0.0)/viewport);
float r = current.r;
float g = current.g;
float b = current.b;
if( v_offset < 1.0 )
{
float z = v_offset;
r = mix(current.r, previous.b, z);
g = mix(current.g, current.r, z);
b = mix(current.b, current.g, z);
}
else if( v_offset < 2.0 )
{
float z = v_offset - 1.0;
r = mix(previous.b, previous.g, z);
g = mix(current.r, previous.b, z);
b = mix(current.g, current.r, z);
}
else //if( v_offset <= 1.0 )
{
float z = v_offset - 2.0;
r = mix(previous.g, previous.r, z);
g = mix(previous.b, previous.g, z);
b = mix(current.r, previous.b, z);
}
float t = max(max(r,g),b);
vec4 color = vec4(v_color.rgb, (r+g+b)/3.0);
color = t*color + (1.0-t)*vec4(r,g,b, min(min(r,g),b));
gl_FragColor = vec4( color.rgb, v_color.a*color.a);
}
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