1varying vec2 texCoord; 2 3attribute vec3 inPosition; 4attribute vec2 inTexCoord; 5 6void main(){ 7 texCoord = inTexCoord; 8 vec4 pos = vec4(inPosition, 1.0); 9 gl_Position = vec4(sign(pos.xy-vec2(0.5)), 0.0, 1.0); 10}