CodeChickenCore/codechicken/lib/render/CCRenderState.java

package codechicken.lib.render;

import codechicken.lib.colour.ColourRGBA;
import net.minecraft.block.Block;
import net.minecraft.client.Minecraft;
import net.minecraft.client.renderer.OpenGlHelper;
import net.minecraft.client.renderer.Tessellator;
import net.minecraft.util.ResourceLocation;
import net.minecraft.world.IBlockAccess;

public class CCRenderState
{    
    private static boolean useNormals;
    private static boolean hasBrightness;
    private static int brightness;
    private static boolean useModelColours;
    private static int colour;
    private static boolean hasColour;
    private static int alpha;
    private static boolean alphaOverride;
    
    public static void useNormals(boolean b)
    {
        useNormals = b;
    }
    
    public static boolean useNormals()
    {
        return useNormals;
    }
    
    public static void useModelColours(boolean b)
    {
        useModelColours = b;
    }

    public static boolean useModelColours()
    {
        return useModelColours;
    }
    
    public static void setAlpha(int a)
    {
        alpha = a;
        alphaOverride = true;
    }
    
    public static void clearAlphaOverride()
    {
        alphaOverride = false;
    }
    
    public static void vertexColour(int c)
    {
        if(alphaOverride)
            setColour(c&0xFFFFFF00|alpha);
        else
            setColour(c);
    }

    public static void vertexColour(int r, int g, int b, int a)
    {
        if(alphaOverride)
            Tessellator.instance.setColorRGBA(r, g, b, alpha);
        else
            Tessellator.instance.setColorRGBA(r, g, b, a);
    }
    
    public static void setBrightness(IBlockAccess world, int x, int y, int z)
    {
        Block block = Block.blocksList[world.getBlockId(x, y, z)];
        setBrightness(block == null ? world.getLightBrightnessForSkyBlocks(x, y, z, 0) : block.getMixedBrightnessForBlock(world, x, y, z));
        setColour(0xFFFFFFFF);
    }

    public static void setBrightness(int b)
    {
        hasBrightness = true;
        Tessellator.instance.setBrightness(brightness = b);
    }
    
    public static void setColourOpaque(int c)
    {
        setColour(c << 8 | 0xFF);
    }
    
    //RGBA
    public static void setColour(int c)
    {
        hasColour = true;
        colour = c;
        Tessellator.instance.setColorRGBA(colour >> 24 & 0xFF, colour >> 16 & 0xFF, colour >> 8 & 0xFF, colour & 0xFF);
    }
    
    public static void changeTexture(String texture)
    {
        changeTexture(new ResourceLocation(texture));
    }
    
    public static void changeTexture(ResourceLocation texture)
    {
        Minecraft.getMinecraft().renderEngine.func_110577_a(texture);
    }

    public static void apply()
    {
        if(hasBrightness)
            Tessellator.instance.setBrightness(brightness);
        if(hasColour)
            Tessellator.instance.setColorRGBA(colour >> 24 & 0xFF, colour >> 16 & 0xFF, colour >> 8 & 0xFF, colour & 0xFF);
    }

    public static void reset()
    {
        hasBrightness = false;
        useModelColours = false;
        hasColour = false;
        alphaOverride = false;
    }

    public static void startDrawing(int i)
    {
        Tessellator.instance.startDrawing(i);
        apply();
    }

    public static void draw()
    {
        Tessellator.instance.draw();
    }

    public static void pullLightmap()
    {
        setBrightness((int)OpenGlHelper.lastBrightnessY << 16 | (int)OpenGlHelper.lastBrightnessX);
    }

    public static void applyBrightnessTexCoords()
    {
        OpenGlHelper.setLightmapTextureCoords(OpenGlHelper.lightmapTexUnit, brightness&0xFFFF, brightness>>>16);
    }

    public static void glColour()
    {
        new ColourRGBA(colour).glColour();
    }
}