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package cc.polyfrost.oneconfig.lwjgl;
import org.lwjgl.nanovg.NanoVG;
import java.util.ArrayList;
public class ScissorManager {
private static final ArrayList<Scissor> scissors = new ArrayList<>();
public static Scissor scissor(long vg, float x, float y, float width, float height) {
Scissor scissor = new Scissor(x, y, width, height);
if (scissors.contains(scissor)) return scissor;
scissors.add(scissor);
applyScissors(vg);
return scissor;
}
public static void resetScissor(long vg, Scissor scissor) {
if (scissors.contains(scissor)) {
scissors.remove(scissor);
applyScissors(vg);
}
}
private static void applyScissors(long vg) {
NanoVG.nvgResetScissor(vg);
if (scissors.size() <= 0) return;
Scissor finalScissor = new Scissor(scissors.get(0));
for (int i = 1; i < scissors.size(); i++) {
Scissor scissor = scissors.get(i);
float rightX = Math.min(scissor.x + scissor.width, finalScissor.x + finalScissor.width);
float rightY = Math.min(scissor.y + scissor.height, finalScissor.y + finalScissor.height);
finalScissor.x = Math.max(finalScissor.x, scissor.x);
finalScissor.y = Math.max(finalScissor.y, scissor.y);
finalScissor.width = rightX - finalScissor.x;
finalScissor.height = rightY - finalScissor.y;
}
NanoVG.nvgScissor(vg, finalScissor.x, finalScissor.y, finalScissor.width, finalScissor.height);
}
}
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