blob: 8fecde4a5c9bf37858d73a484a79701e50cf64e6 [file] [log] [blame]
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);
}