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#version 450
// One instance per Surface image attachment. The CPU has already converted
// the pane's cell rectangle and the aspect-preserving contain fit to NDC.
layout(location = 0) in vec4 a_rect; // x0, y0, x1, y1
layout(location = 1) in vec4 a_uv_rect; // u0, v0, u1, v1
layout(location = 0) out vec2 v_uv;
void main() {
vec2 pos;
int corner = gl_VertexIndex % 6;
if (corner == 0) {
pos = vec2(a_rect.x, a_rect.y);
v_uv = vec2(a_uv_rect.x, a_uv_rect.y);
} else if (corner == 1) {
pos = vec2(a_rect.z, a_rect.y);
v_uv = vec2(a_uv_rect.z, a_uv_rect.y);
} else if (corner == 2) {
pos = vec2(a_rect.z, a_rect.w);
v_uv = vec2(a_uv_rect.z, a_uv_rect.w);
} else if (corner == 3) {
pos = vec2(a_rect.x, a_rect.y);
v_uv = vec2(a_uv_rect.x, a_uv_rect.y);
} else if (corner == 4) {
pos = vec2(a_rect.z, a_rect.w);
v_uv = vec2(a_uv_rect.z, a_uv_rect.w);
} else {
pos = vec2(a_rect.x, a_rect.w);
v_uv = vec2(a_uv_rect.x, a_uv_rect.w);
}
gl_Position = vec4(pos, 0.0, 1.0);
}
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