protot/3rdparty/bgfx/examples/common/font/fs_font_distance_field.sc

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2016-08-29 22:31:11 +02:00
$input v_color0, v_texcoord0
#include "../../common/common.sh"
SAMPLERCUBE(s_texColor, 0);
void main()
{
vec4 color = textureCube(s_texColor, v_texcoord0.xyz);
int index = int(v_texcoord0.w*4.0 + 0.5);
float rgba[4];
rgba[0] = color.z;
rgba[1] = color.y;
rgba[2] = color.x;
rgba[3] = color.w;
float dist = rgba[index];
float dx = length(dFdx(v_texcoord0.xyz) );
float dy = length(dFdy(v_texcoord0.xyz) );
float w = 16.0*0.5*(dx+dy);
float alpha = smoothstep(0.5-w, 0.5+w, dist);
gl_FragColor = vec4(v_color0.xyz, v_color0.w*alpha);
}