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