meepmap

import net.minecraft.client.Minecraft;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL12;
import org.lwjgl.opengl.GL14;
import org.lwjgl.opengl.GL30;
import org.lwjgl.util.glu.GLU;
import org.lwjgl.opengl.GLContext;
import org.lwjgl.opengl.EXTFramebufferObject;

public class mod_MipMap extends BaseMod {
    private static boolean done = false;
    private static boolean norefresh = false;
    org.lwjgl.opengl.ContextCapabilities capabilities;
    int mode = -1;
    int textureName;

    public mod_MipMap() {
        ModLoader.SetInGameHook(this, true, false);
    }

    public void OnTickInGame(Minecraft var1) {
        if (var1.q != null || var1.e == null) // current ingame screen open || world not loaded
            return;

        if (norefresh)
            return;

        if (!done) {
            done = true;

            try {
                textureName = var1.o.a("/terrain.png");
            } catch (Exception e) {
                System.out.println("Couldn't initialize mipmapping:");
                e.printStackTrace();
                norefresh = true;
                return;
            }

            GL11.glBindTexture(3553, textureName);
            GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_NEAREST_MIPMAP_LINEAR);
            int textureWidth = GL11.glGetTexLevelParameteri(GL11.GL_TEXTURE_2D, 0, GL11.GL_TEXTURE_WIDTH);
            int tileWidth = textureWidth/16;
            int mipLevels = (int)Math.round(Math.log((double)tileWidth)/Math.log(2D));
            GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL12.GL_TEXTURE_MAX_LOD, mipLevels);
            GL11.glAlphaFunc(GL11.GL_GEQUAL, 0.5F);
            capabilities = GLContext.getCapabilities();

            if (capabilities.OpenGL30) {
                System.out.println("Using OpenGL 3.0 for mipmap generation.");
                mode = 1;
            } else if (capabilities.GL_EXT_framebuffer_object) {
                System.out.println("Using GL_EXT_framebuffer_object extension for mipmap generation.");
                mode = 2;
            } else if (capabilities.OpenGL14) {
                System.out.println("Using GL_GENERATE_MIPMAP for mipmap generation. This might slow down with large textures.");
                mode = 3;
                GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL14.GL_GENERATE_MIPMAP, GL11.GL_TRUE);
                norefresh = true;
                return;
            } else {
                System.out.println("Sorry, I could not find a suitable mechanism for automatic mipmap generation. Not enabling mipmapping.");
                norefresh = true;
                return;
            }
        }

        GL11.glBindTexture(3553, textureName);

        switch (mode) {
        case 1:
            GL30.glGenerateMipmap(GL11.GL_TEXTURE_2D);
            break;
        case 2:
            EXTFramebufferObject.glGenerateMipmapEXT(GL11.GL_TEXTURE_2D);
            break;
        }
    }

    public String Version() {
        return "1.2";
    }
}