001 package net.minecraft.client.renderer.culling;
002
003 import cpw.mods.fml.relauncher.Side;
004 import cpw.mods.fml.relauncher.SideOnly;
005 import java.nio.FloatBuffer;
006 import net.minecraft.client.renderer.GLAllocation;
007 import net.minecraft.util.MathHelper;
008 import org.lwjgl.opengl.GL11;
009
010 @SideOnly(Side.CLIENT)
011 public class ClippingHelperImpl extends ClippingHelper
012 {
013 private static ClippingHelperImpl instance = new ClippingHelperImpl();
014 private FloatBuffer projectionMatrixBuffer = GLAllocation.createDirectFloatBuffer(16);
015 private FloatBuffer modelviewMatrixBuffer = GLAllocation.createDirectFloatBuffer(16);
016 private FloatBuffer field_78564_h = GLAllocation.createDirectFloatBuffer(16);
017
018 /**
019 * Initialises the ClippingHelper object then returns an instance of it.
020 */
021 public static ClippingHelper getInstance()
022 {
023 instance.init();
024 return instance;
025 }
026
027 /**
028 * Normalize the frustum.
029 */
030 private void normalize(float[][] par1ArrayOfFloat, int par2)
031 {
032 float var3 = MathHelper.sqrt_float(par1ArrayOfFloat[par2][0] * par1ArrayOfFloat[par2][0] + par1ArrayOfFloat[par2][1] * par1ArrayOfFloat[par2][1] + par1ArrayOfFloat[par2][2] * par1ArrayOfFloat[par2][2]);
033 par1ArrayOfFloat[par2][0] /= var3;
034 par1ArrayOfFloat[par2][1] /= var3;
035 par1ArrayOfFloat[par2][2] /= var3;
036 par1ArrayOfFloat[par2][3] /= var3;
037 }
038
039 private void init()
040 {
041 this.projectionMatrixBuffer.clear();
042 this.modelviewMatrixBuffer.clear();
043 this.field_78564_h.clear();
044 GL11.glGetFloat(GL11.GL_PROJECTION_MATRIX, this.projectionMatrixBuffer);
045 GL11.glGetFloat(GL11.GL_MODELVIEW_MATRIX, this.modelviewMatrixBuffer);
046 this.projectionMatrixBuffer.flip().limit(16);
047 this.projectionMatrixBuffer.get(this.projectionMatrix);
048 this.modelviewMatrixBuffer.flip().limit(16);
049 this.modelviewMatrixBuffer.get(this.modelviewMatrix);
050 this.clippingMatrix[0] = this.modelviewMatrix[0] * this.projectionMatrix[0] + this.modelviewMatrix[1] * this.projectionMatrix[4] + this.modelviewMatrix[2] * this.projectionMatrix[8] + this.modelviewMatrix[3] * this.projectionMatrix[12];
051 this.clippingMatrix[1] = this.modelviewMatrix[0] * this.projectionMatrix[1] + this.modelviewMatrix[1] * this.projectionMatrix[5] + this.modelviewMatrix[2] * this.projectionMatrix[9] + this.modelviewMatrix[3] * this.projectionMatrix[13];
052 this.clippingMatrix[2] = this.modelviewMatrix[0] * this.projectionMatrix[2] + this.modelviewMatrix[1] * this.projectionMatrix[6] + this.modelviewMatrix[2] * this.projectionMatrix[10] + this.modelviewMatrix[3] * this.projectionMatrix[14];
053 this.clippingMatrix[3] = this.modelviewMatrix[0] * this.projectionMatrix[3] + this.modelviewMatrix[1] * this.projectionMatrix[7] + this.modelviewMatrix[2] * this.projectionMatrix[11] + this.modelviewMatrix[3] * this.projectionMatrix[15];
054 this.clippingMatrix[4] = this.modelviewMatrix[4] * this.projectionMatrix[0] + this.modelviewMatrix[5] * this.projectionMatrix[4] + this.modelviewMatrix[6] * this.projectionMatrix[8] + this.modelviewMatrix[7] * this.projectionMatrix[12];
055 this.clippingMatrix[5] = this.modelviewMatrix[4] * this.projectionMatrix[1] + this.modelviewMatrix[5] * this.projectionMatrix[5] + this.modelviewMatrix[6] * this.projectionMatrix[9] + this.modelviewMatrix[7] * this.projectionMatrix[13];
056 this.clippingMatrix[6] = this.modelviewMatrix[4] * this.projectionMatrix[2] + this.modelviewMatrix[5] * this.projectionMatrix[6] + this.modelviewMatrix[6] * this.projectionMatrix[10] + this.modelviewMatrix[7] * this.projectionMatrix[14];
057 this.clippingMatrix[7] = this.modelviewMatrix[4] * this.projectionMatrix[3] + this.modelviewMatrix[5] * this.projectionMatrix[7] + this.modelviewMatrix[6] * this.projectionMatrix[11] + this.modelviewMatrix[7] * this.projectionMatrix[15];
058 this.clippingMatrix[8] = this.modelviewMatrix[8] * this.projectionMatrix[0] + this.modelviewMatrix[9] * this.projectionMatrix[4] + this.modelviewMatrix[10] * this.projectionMatrix[8] + this.modelviewMatrix[11] * this.projectionMatrix[12];
059 this.clippingMatrix[9] = this.modelviewMatrix[8] * this.projectionMatrix[1] + this.modelviewMatrix[9] * this.projectionMatrix[5] + this.modelviewMatrix[10] * this.projectionMatrix[9] + this.modelviewMatrix[11] * this.projectionMatrix[13];
060 this.clippingMatrix[10] = this.modelviewMatrix[8] * this.projectionMatrix[2] + this.modelviewMatrix[9] * this.projectionMatrix[6] + this.modelviewMatrix[10] * this.projectionMatrix[10] + this.modelviewMatrix[11] * this.projectionMatrix[14];
061 this.clippingMatrix[11] = this.modelviewMatrix[8] * this.projectionMatrix[3] + this.modelviewMatrix[9] * this.projectionMatrix[7] + this.modelviewMatrix[10] * this.projectionMatrix[11] + this.modelviewMatrix[11] * this.projectionMatrix[15];
062 this.clippingMatrix[12] = this.modelviewMatrix[12] * this.projectionMatrix[0] + this.modelviewMatrix[13] * this.projectionMatrix[4] + this.modelviewMatrix[14] * this.projectionMatrix[8] + this.modelviewMatrix[15] * this.projectionMatrix[12];
063 this.clippingMatrix[13] = this.modelviewMatrix[12] * this.projectionMatrix[1] + this.modelviewMatrix[13] * this.projectionMatrix[5] + this.modelviewMatrix[14] * this.projectionMatrix[9] + this.modelviewMatrix[15] * this.projectionMatrix[13];
064 this.clippingMatrix[14] = this.modelviewMatrix[12] * this.projectionMatrix[2] + this.modelviewMatrix[13] * this.projectionMatrix[6] + this.modelviewMatrix[14] * this.projectionMatrix[10] + this.modelviewMatrix[15] * this.projectionMatrix[14];
065 this.clippingMatrix[15] = this.modelviewMatrix[12] * this.projectionMatrix[3] + this.modelviewMatrix[13] * this.projectionMatrix[7] + this.modelviewMatrix[14] * this.projectionMatrix[11] + this.modelviewMatrix[15] * this.projectionMatrix[15];
066 this.frustum[0][0] = this.clippingMatrix[3] - this.clippingMatrix[0];
067 this.frustum[0][1] = this.clippingMatrix[7] - this.clippingMatrix[4];
068 this.frustum[0][2] = this.clippingMatrix[11] - this.clippingMatrix[8];
069 this.frustum[0][3] = this.clippingMatrix[15] - this.clippingMatrix[12];
070 this.normalize(this.frustum, 0);
071 this.frustum[1][0] = this.clippingMatrix[3] + this.clippingMatrix[0];
072 this.frustum[1][1] = this.clippingMatrix[7] + this.clippingMatrix[4];
073 this.frustum[1][2] = this.clippingMatrix[11] + this.clippingMatrix[8];
074 this.frustum[1][3] = this.clippingMatrix[15] + this.clippingMatrix[12];
075 this.normalize(this.frustum, 1);
076 this.frustum[2][0] = this.clippingMatrix[3] + this.clippingMatrix[1];
077 this.frustum[2][1] = this.clippingMatrix[7] + this.clippingMatrix[5];
078 this.frustum[2][2] = this.clippingMatrix[11] + this.clippingMatrix[9];
079 this.frustum[2][3] = this.clippingMatrix[15] + this.clippingMatrix[13];
080 this.normalize(this.frustum, 2);
081 this.frustum[3][0] = this.clippingMatrix[3] - this.clippingMatrix[1];
082 this.frustum[3][1] = this.clippingMatrix[7] - this.clippingMatrix[5];
083 this.frustum[3][2] = this.clippingMatrix[11] - this.clippingMatrix[9];
084 this.frustum[3][3] = this.clippingMatrix[15] - this.clippingMatrix[13];
085 this.normalize(this.frustum, 3);
086 this.frustum[4][0] = this.clippingMatrix[3] - this.clippingMatrix[2];
087 this.frustum[4][1] = this.clippingMatrix[7] - this.clippingMatrix[6];
088 this.frustum[4][2] = this.clippingMatrix[11] - this.clippingMatrix[10];
089 this.frustum[4][3] = this.clippingMatrix[15] - this.clippingMatrix[14];
090 this.normalize(this.frustum, 4);
091 this.frustum[5][0] = this.clippingMatrix[3] + this.clippingMatrix[2];
092 this.frustum[5][1] = this.clippingMatrix[7] + this.clippingMatrix[6];
093 this.frustum[5][2] = this.clippingMatrix[11] + this.clippingMatrix[10];
094 this.frustum[5][3] = this.clippingMatrix[15] + this.clippingMatrix[14];
095 this.normalize(this.frustum, 5);
096 }
097 }