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/*
* This file is part of OneConfig.
* OneConfig - Next Generation Config Library for Minecraft: Java Edition
* Copyright (C) 2021, 2022 Polyfrost.
* <https://polyfrost.cc> <https://github.com/Polyfrost/>
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* OneConfig is licensed under the terms of version 3 of the GNU Lesser
* General Public License as published by the Free Software Foundation, AND
* under the Additional Terms Applicable to OneConfig, as published by Polyfrost,
* either version 1.0 of the Additional Terms, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License. If not, see <https://www.gnu.org/licenses/>. You should
* have also received a copy of the Additional Terms Applicable
* to OneConfig, as published by Polyfrost. If not, see
* <https://polyfrost.cc/legal/oneconfig/additional-terms>
*/
package cc.polyfrost.oneconfig.renderer.scissor;
import org.lwjgl.nanovg.NanoVG;
import java.util.ArrayList;
/**
* Provides an easy way to manage and group scissor rectangles.
*/
public class ScissorManager {
private static final ArrayList<ArrayList<Scissor>> previousScissors = new ArrayList<>();
private static ArrayList<Scissor> scissors = new ArrayList<>();
/**
* Adds and applies a scissor rectangle to the list of scissor rectangles.
*
* @param vg The NanoVG context.
* @param x The x coordinate of the scissor rectangle.
* @param y The y coordinate of the scissor rectangle.
* @param width The width of the scissor rectangle.
* @param height The height of the scissor rectangle.
* @return The scissor rectangle.
*/
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;
}
/**
* Resets the scissor rectangle provided.
*
* @param vg The NanoVG context.
* @param scissor The scissor rectangle to reset.
*/
public static void resetScissor(long vg, Scissor scissor) {
if (scissors.contains(scissor)) {
scissors.remove(scissor);
applyScissors(vg);
}
}
/**
* Clear all scissor rectangles.
*
* @param vg The NanoVG context.
*/
public static void clearScissors(long vg) {
scissors.clear();
NanoVG.nvgResetScissor(vg);
}
/**
* Save the current scissors
*/
public static void save() {
previousScissors.add(new ArrayList<>(scissors));
}
/**
* Restore the scissors from the last save
*
* @param vg The NanoVG context.
*/
public static void restore(long vg) {
scissors = previousScissors.remove(0);
applyScissors(vg);
}
private static void applyScissors(long vg) {
NanoVG.nvgResetScissor(vg);
if (scissors.size() == 0) return;
Scissor finalScissor = getFinalScissor(scissors);
NanoVG.nvgScissor(vg, finalScissor.x, finalScissor.y, finalScissor.width, finalScissor.height);
}
private static Scissor getFinalScissor(ArrayList<Scissor> scissors) {
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;
}
return finalScissor;
}
}
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