RenderBlockGlowOverlay.java

package de.sanandrew.core.manpack.util.client;

import cpw.mods.fml.client.registry.ISimpleBlockRenderingHandler;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import net.minecraft.block.Block;
import net.minecraft.client.renderer.OpenGlHelper;
import net.minecraft.client.renderer.RenderBlocks;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.world.IBlockAccess;
import org.lwjgl.opengl.GL11;

@SideOnly( Side.CLIENT )
public class RenderBlockGlowOverlay
        implements ISimpleBlockRenderingHandler
{
    public static int renderID = 0;

    @Override
    public void renderInventoryBlock(Block block, int metadata, int modelID, RenderBlocks renderer) {
        Tessellator tessellator = Tessellator.instance;
        IGlowBlockOverlay blockOverlay = (block instanceof IGlowBlockOverlay) ? (IGlowBlockOverlay) block : null;

        block.setBlockBoundsForItemRender();
        renderer.setRenderBoundsFromBlock(block);

        GL11.glRotatef(90.0F, 0.0F, 1.0F, 0.0F);
        GL11.glTranslatef(-0.5F, -0.5F, -0.5F);

        tessellator.startDrawingQuads();
        tessellator.setNormal(0.0F, -1.0F, 0.0F);
        renderer.renderFaceYNeg(block, 0.0D, 0.0D, 0.0D, renderer.getBlockIconFromSideAndMetadata(block, 0, metadata));
        tessellator.draw();

        tessellator.startDrawingQuads();
        tessellator.setNormal(0.0F, 1.0F, 0.0F);
        renderer.renderFaceYPos(block, 0.0D, 0.0D, 0.0D, renderer.getBlockIconFromSideAndMetadata(block, 1, metadata));
        tessellator.draw();

        tessellator.startDrawingQuads();
        tessellator.setNormal(0.0F, 0.0F, -1.0F);
        renderer.renderFaceZNeg(block, 0.0D, 0.0D, 0.0D, renderer.getBlockIconFromSideAndMetadata(block, 2, metadata));
        tessellator.draw();

        tessellator.startDrawingQuads();
        tessellator.setNormal(0.0F, 0.0F, 1.0F);
        renderer.renderFaceZPos(block, 0.0D, 0.0D, 0.0D, renderer.getBlockIconFromSideAndMetadata(block, 3, metadata));
        tessellator.draw();

        tessellator.startDrawingQuads();
        tessellator.setNormal(-1.0F, 0.0F, 0.0F);
        renderer.renderFaceXNeg(block, 0.0D, 0.0D, 0.0D, renderer.getBlockIconFromSideAndMetadata(block, 4, metadata));
        tessellator.draw();

        tessellator.startDrawingQuads();
        tessellator.setNormal(1.0F, 0.0F, 0.0F);
        renderer.renderFaceXPos(block, 0.0D, 0.0D, 0.0D, renderer.getBlockIconFromSideAndMetadata(block, 5, metadata));
        tessellator.draw();

        if( blockOverlay != null ) {
            float lastBrightX = OpenGlHelper.lastBrightnessX;
            float lastBrightY = OpenGlHelper.lastBrightnessY;
            char bright = 0x000F0;
            float brightX = bright % 65536;
            float brightY = bright / 65536;

            OpenGlHelper.setLightmapTextureCoords(OpenGlHelper.lightmapTexUnit, brightX, brightY);

            tessellator.startDrawingQuads();
            tessellator.setNormal(0.0F, -1.0F, 0.0F);
            renderer.renderFaceYNeg(block, 0.0D, 0.0D, 0.0D, blockOverlay.getOverlayInvTexture(0, metadata));
            tessellator.draw();

            tessellator.startDrawingQuads();
            tessellator.setNormal(0.0F, 1.0F, 0.0F);
            renderer.renderFaceYPos(block, 0.0D, 0.0D, 0.0D, blockOverlay.getOverlayInvTexture(1, metadata));
            tessellator.draw();

            tessellator.startDrawingQuads();
            tessellator.setNormal(0.0F, 0.0F, -1.0F);
            renderer.renderFaceZNeg(block, 0.0D, 0.0D, 0.0D, blockOverlay.getOverlayInvTexture(2, metadata));
            tessellator.draw();

            tessellator.startDrawingQuads();
            tessellator.setNormal(0.0F, 0.0F, 1.0F);
            renderer.renderFaceZPos(block, 0.0D, 0.0D, 0.0D, blockOverlay.getOverlayInvTexture(3, metadata));
            tessellator.draw();

            tessellator.startDrawingQuads();
            tessellator.setNormal(-1.0F, 0.0F, 0.0F);
            renderer.renderFaceXNeg(block, 0.0D, 0.0D, 0.0D, blockOverlay.getOverlayInvTexture(4, metadata));
            tessellator.draw();

            tessellator.startDrawingQuads();
            tessellator.setNormal(1.0F, 0.0F, 0.0F);
            renderer.renderFaceXPos(block, 0.0D, 0.0D, 0.0D, blockOverlay.getOverlayInvTexture(5, metadata));
            tessellator.draw();

            OpenGlHelper.setLightmapTextureCoords(OpenGlHelper.lightmapTexUnit, lastBrightX, lastBrightY);
        }

        GL11.glTranslatef(0.5F, 0.5F, 0.5F);
    }

    @Override
    public boolean renderWorldBlock(IBlockAccess world, int x, int y, int z, Block block, int modelId, RenderBlocks renderer) {
        renderer.renderStandardBlockWithColorMultiplier(block, x, y, z, 1F, 1F, 1F);

        if( block instanceof IGlowBlockOverlay ) {
            IGlowBlockOverlay icn = (IGlowBlockOverlay) block;
            Tessellator.instance.setBrightness(240);
            Tessellator.instance.setColorOpaque(255, 255, 255);

            // render the overlaying block START
            renderer.renderFaceYNeg(block, x, y, z, icn.getOverlayTexture(world, x, y, z, 0));
            renderer.renderFaceYPos(block, x, y, z, icn.getOverlayTexture(world, x, y, z, 1));
            renderer.renderFaceZNeg(block, x, y, z, icn.getOverlayTexture(world, x, y, z, 2));
            renderer.renderFaceZPos(block, x, y, z, icn.getOverlayTexture(world, x, y, z, 3));
            renderer.renderFaceXNeg(block, x, y, z, icn.getOverlayTexture(world, x, y, z, 4));
            renderer.renderFaceXPos(block, x, y, z, icn.getOverlayTexture(world, x, y, z, 5));
            // render the overlaying block END

            Tessellator.instance.setBrightness(block.getMixedBrightnessForBlock(world, x, y, z));
        }
        return true;
    }

    @Override
    public boolean shouldRender3DInInventory(int modelId) {
        return true;
    }

    @Override
    public int getRenderId() {
        return 0;
    }
}