#blend mix
#depth off
#primitive triangle
#cull none
 
@vs vs
in vec3 a_pos;
in vec2 a_uv;
out vec2 uv;
out vec4 shade;
 
vec3 pos;

struct sprite {
  mat4 model;
  vec4 rect;
  vec4 shade;
};

readonly buffer ssbo {
  sprite sprites[];
};

uniform mat4 vp;

void main()
{
  sprite s = sprites[gl_InstanceIndex];
  pos = a_pos;
  uv = a_uv;
  pos *= vec3(s.rect.zw,1);
  uv = (uv*s.rect.zw)+s.rect.xy;
  gl_Position =  vp * s.model * vec4(pos, 1.0);
  shade = s.shade;
}
@end

@fs fs

in vec2 uv;
in vec4 shade;

out vec4 color;

texture2D diffuse;
sampler smp;

void frag()
{
  color = texture(sampler2D(diffuse,smp), uv);
  color *= shade;
}

void main()
{
  frag();
}
@end

@program sprite vs fs