#depth off

@vs vs
in vec2 a_pos;
in vec2 a_uv;

struct letter {
  vec2 pos;
  vec2 wh;
  vec2 uv;
  vec2 st;
  vec4 color;
};

readonly buffer ssbo {
  letter ls[];
};

out vec2 uv;
out vec2 fuv;
out vec4 color0;

vec2 pos;

uniform mat4 vp;

@include_block vert

void main()
{
  letter l = ls[gl_InstanceIndex];
  fuv = l.uv + vec2(a_pos.x*l.st.x, l.st.y - a_pos.y*l.st.y);
  uv = a_uv;
  color0 = l.color;
  pos = l.pos+(a_pos*l.wh);
  vert();
  gl_Position = vp * vec4(pos, 0.0, 1.0);
}
@end

@fs fs
in vec2 uv;
in vec2 fuv;
in vec4 color0;

out vec4 color;

texture2D text;
sampler smp;

@include_block frag

void main()
{
  float lettera = texture(sampler2D(text,smp),fuv).r;
  if (lettera < 0.1f) discard;
  frag();
}
@end

@program text vs fs