| |
| layout (location = 1) noperspective out vec2 vcoord_Stage0; |
| void main() { |
| int x = gl_InstanceID % 200; |
| int y = gl_InstanceID / 200; |
| int ileft = (gl_InstanceID * 929) % 17; |
| int iright = (ileft + 1) + (gl_InstanceID * 1637) % (17 - ileft); |
| int itop = (gl_InstanceID * 313) % 17; |
| int ibot = (itop + 1) + (gl_InstanceID * 1901) % (17 - itop); |
| float outset = 0.03125; |
| outset = 0 == (x + y) % 2 ? -outset : outset; |
| float l = float(ileft) / 16.0 - outset; |
| float r = float(iright) / 16.0 + outset; |
| float t = float(itop) / 16.0 - outset; |
| float b = float(ibot) / 16.0 + outset; |
| vec2 vertexpos; |
| vertexpos.x = float(x) + (0 == gl_VertexID % 2 ? l : r); |
| vertexpos.y = float(y) + (0 == gl_VertexID / 2 ? t : b); |
| vcoord_Stage0.x = float(0 == gl_VertexID % 2 ? -1 : 1); |
| vcoord_Stage0.y = float(0 == gl_VertexID / 2 ? -1 : 1); |
| gl_Position = vec4(vertexpos.x, vertexpos.y, 0.0, 1.0); |
| } |
