#if VERTEX_SHADER

vec2 positions[3] = vec2[](
    vec2(-0.5, 0.5),
    vec2(0.5, 0.5),
    vec2(0.0, -0.5)
);

vec3 colors[3] = vec3[](
    vec3(1.0, 0.0, 0.0),
    vec3(0.0, 1.0, 0.0),
    vec3(0.0, 0.0, 1.0)
);

layout(location = 0) out vec3 VertexColor;

void main() {
  VertexColor = colors[gl_VertexIndex];
  gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
}

#endif

#if FRAGMENT_SHADER

layout(location = 0) in vec3 VertexColor;

layout(location = 0) out vec4 FragColor;

void main() {
  FragColor = vec4(VertexColor, 1.0);
}

#endif