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package com.thatgravyboat.skyblockhud.core;
import java.util.LinkedList;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.ScaledResolution;
import org.lwjgl.opengl.GL11;
public class GlScissorStack {
private static class Bounds {
int left;
int top;
int right;
int bottom;
public Bounds(int left, int top, int right, int bottom) {
this.left = left;
this.top = top;
this.right = right;
this.bottom = bottom;
}
public Bounds createSubBound(int left, int top, int right, int bottom) {
left = Math.max(left, this.left);
top = Math.max(top, this.top);
right = Math.min(right, this.right);
bottom = Math.min(bottom, this.bottom);
if (top > bottom) {
top = bottom;
}
if (left > right) {
left = right;
}
return new Bounds(left, top, right, bottom);
}
public void set(ScaledResolution scaledResolution) {
int height = Minecraft.getMinecraft().displayHeight;
int scale = scaledResolution.getScaleFactor();
GL11.glScissor(left * scale, height - bottom * scale, (right - left) * scale, (bottom - top) * scale);
}
}
private static final LinkedList<Bounds> boundsStack = new LinkedList<>();
public static void push(int left, int top, int right, int bottom, ScaledResolution scaledResolution) {
if (right < left) {
int temp = right;
right = left;
left = temp;
}
if (bottom < top) {
int temp = bottom;
bottom = top;
top = temp;
}
if (boundsStack.isEmpty()) {
boundsStack.push(new Bounds(left, top, right, bottom));
} else {
boundsStack.push(boundsStack.peek().createSubBound(left, top, right, bottom));
}
if (!boundsStack.isEmpty()) {
boundsStack.peek().set(scaledResolution);
}
GL11.glEnable(GL11.GL_SCISSOR_TEST);
}
public static void pop(ScaledResolution scaledResolution) {
if (!boundsStack.isEmpty()) {
boundsStack.pop();
}
if (boundsStack.isEmpty()) {
GL11.glDisable(GL11.GL_SCISSOR_TEST);
} else {
boundsStack.peek().set(scaledResolution);
}
}
public static void clear() {
boundsStack.clear();
GL11.glDisable(GL11.GL_SCISSOR_TEST);
}
}
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