#version 450 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 fragColor; void main() { gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0); fragColor = colors[gl_VertexIndex]; }