001    package net.minecraft.src;
002    
003    import cpw.mods.fml.common.Side;
004    import cpw.mods.fml.common.asm.SideOnly;
005    
006    @SideOnly(Side.CLIENT)
007    public class TexturedQuad
008    {
009        public PositionTextureVertex[] vertexPositions;
010        public int nVertices;
011        private boolean invertNormal;
012    
013        public TexturedQuad(PositionTextureVertex[] par1ArrayOfPositionTextureVertex)
014        {
015            this.nVertices = 0;
016            this.invertNormal = false;
017            this.vertexPositions = par1ArrayOfPositionTextureVertex;
018            this.nVertices = par1ArrayOfPositionTextureVertex.length;
019        }
020    
021        public TexturedQuad(PositionTextureVertex[] par1ArrayOfPositionTextureVertex, int par2, int par3, int par4, int par5, float par6, float par7)
022        {
023            this(par1ArrayOfPositionTextureVertex);
024            float var8 = 0.0F / par6;
025            float var9 = 0.0F / par7;
026            par1ArrayOfPositionTextureVertex[0] = par1ArrayOfPositionTextureVertex[0].setTexturePosition((float)par4 / par6 - var8, (float)par3 / par7 + var9);
027            par1ArrayOfPositionTextureVertex[1] = par1ArrayOfPositionTextureVertex[1].setTexturePosition((float)par2 / par6 + var8, (float)par3 / par7 + var9);
028            par1ArrayOfPositionTextureVertex[2] = par1ArrayOfPositionTextureVertex[2].setTexturePosition((float)par2 / par6 + var8, (float)par5 / par7 - var9);
029            par1ArrayOfPositionTextureVertex[3] = par1ArrayOfPositionTextureVertex[3].setTexturePosition((float)par4 / par6 - var8, (float)par5 / par7 - var9);
030        }
031    
032        public void flipFace()
033        {
034            PositionTextureVertex[] var1 = new PositionTextureVertex[this.vertexPositions.length];
035    
036            for (int var2 = 0; var2 < this.vertexPositions.length; ++var2)
037            {
038                var1[var2] = this.vertexPositions[this.vertexPositions.length - var2 - 1];
039            }
040    
041            this.vertexPositions = var1;
042        }
043    
044        public void draw(Tessellator par1Tessellator, float par2)
045        {
046            Vec3 var3 = this.vertexPositions[1].vector3D.subtract(this.vertexPositions[0].vector3D);
047            Vec3 var4 = this.vertexPositions[1].vector3D.subtract(this.vertexPositions[2].vector3D);
048            Vec3 var5 = var4.crossProduct(var3).normalize();
049            par1Tessellator.startDrawingQuads();
050    
051            if (this.invertNormal)
052            {
053                par1Tessellator.setNormal(-((float)var5.xCoord), -((float)var5.yCoord), -((float)var5.zCoord));
054            }
055            else
056            {
057                par1Tessellator.setNormal((float)var5.xCoord, (float)var5.yCoord, (float)var5.zCoord);
058            }
059    
060            for (int var6 = 0; var6 < 4; ++var6)
061            {
062                PositionTextureVertex var7 = this.vertexPositions[var6];
063                par1Tessellator.addVertexWithUV((double)((float)var7.vector3D.xCoord * par2), (double)((float)var7.vector3D.yCoord * par2), (double)((float)var7.vector3D.zCoord * par2), (double)var7.texturePositionX, (double)var7.texturePositionY);
064            }
065    
066            par1Tessellator.draw();
067        }
068    }