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