kihira.foxlib.client.RenderHelper.java Source code

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Here is the source code for kihira.foxlib.client.RenderHelper.java

Source

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014 Zoe Lee (Kihira)
 *
 * See LICENSE for full License
 *
 * Some code provided by iChun under LGPLv3
 */

package kihira.foxlib.client;

import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.ScaledResolution;
import org.lwjgl.opengl.GL11;

public class RenderHelper {

    public static void startGlScissor(int x, int y, int width, int height) {
        Minecraft mc = Minecraft.getMinecraft();
        ScaledResolution reso = new ScaledResolution(mc, mc.displayWidth, mc.displayHeight);

        double scaleW = (double) mc.displayWidth / reso.getScaledWidth_double();
        double scaleH = (double) mc.displayHeight / reso.getScaledHeight_double();

        GL11.glEnable(GL11.GL_SCISSOR_TEST);
        GL11.glScissor((int) Math.floor((double) x * scaleW),
                (int) Math.floor((double) mc.displayHeight - ((double) (y + height) * scaleH)),
                (int) Math.floor((double) (x + width) * scaleW) - (int) Math.floor((double) x * scaleW),
                (int) Math.floor((double) mc.displayHeight - ((double) y * scaleH))
                        - (int) Math.floor((double) mc.displayHeight - ((double) (y + height) * scaleH))); //starts from lower left corner (minecraft starts from upper left)
    }

    public static void endGlScissor() {
        GL11.glDisable(GL11.GL_SCISSOR_TEST);
    }
}