    001    package net.minecraft.client.renderer;
    002
    003    import cpw.mods.fml.common.Side;
    004    import cpw.mods.fml.common.asm.SideOnly;
    005    import java.nio.FloatBuffer;
    006    import java.nio.IntBuffer;
    007    import net.minecraft.block.Block;
    008    import net.minecraft.block.BlockFluid;
    009    import net.minecraft.entity.EntityLiving;
    010    import net.minecraft.entity.player.EntityPlayer;
    011    import net.minecraft.util.MathHelper;
    012    import net.minecraft.util.Vec3;
    013    import net.minecraft.world.ChunkPosition;
    014    import net.minecraft.world.World;
    015    import org.lwjgl.opengl.GL11;
    016    import org.lwjgl.util.glu.GLU;
    017
    018    @SideOnly(Side.CLIENT)
    019    public class ActiveRenderInfo
    020    {
    021        /** The calculated view object X coordinate */
    022        public static float objectX = 0.0F;
    023
    024        /** The calculated view object Y coordinate */
    025        public static float objectY = 0.0F;
    026
    027        /** The calculated view object Z coordinate */
    028        public static float objectZ = 0.0F;
    029
    030        /** The current GL viewport */
    031        private static IntBuffer viewport = GLAllocation.createDirectIntBuffer(16);
    032
    033        /** The current GL modelview matrix */
    034        private static FloatBuffer modelview = GLAllocation.createDirectFloatBuffer(16);
    035
    036        /** The current GL projection matrix */
    037        private static FloatBuffer projection = GLAllocation.createDirectFloatBuffer(16);
    038
    039        /** The computed view object coordinates */
    040        private static FloatBuffer objectCoords = GLAllocation.createDirectFloatBuffer(3);
    041
    042        /** The X component of the entity's yaw rotation */
    043        public static float rotationX;
    044
    045        /** The combined X and Z components of the entity's pitch rotation */
    046        public static float rotationXZ;
    047
    048        /** The Z component of the entity's yaw rotation */
    049        public static float rotationZ;
    050
    051        /**
    052         * The Y component (scaled along the Z axis) of the entity's pitch rotation
    053         */
    054        public static float rotationYZ;
    055
    056        /**
    057         * The Y component (scaled along the X axis) of the entity's pitch rotation
    058         */
    059        public static float rotationXY;
    060
    061        /**
    062         * Updates the current render info and camera location based on entity look angles and 1st/3rd person view mode
    063         */
    064        public static void updateRenderInfo(EntityPlayer par0EntityPlayer, boolean par1)
    065        {
    066            GL11.glGetFloat(GL11.GL_MODELVIEW_MATRIX, modelview);
    067            GL11.glGetFloat(GL11.GL_PROJECTION_MATRIX, projection);
    068            GL11.glGetInteger(GL11.GL_VIEWPORT, viewport);
    069            float var2 = (float)((viewport.get(0) + viewport.get(2)) / 2);
    070            float var3 = (float)((viewport.get(1) + viewport.get(3)) / 2);
    071            GLU.gluUnProject(var2, var3, 0.0F, modelview, projection, viewport, objectCoords);
    072            objectX = objectCoords.get(0);
    073            objectY = objectCoords.get(1);
    074            objectZ = objectCoords.get(2);
    075            int var4 = par1 ? 1 : 0;
    076            float var5 = par0EntityPlayer.rotationPitch;
    077            float var6 = par0EntityPlayer.rotationYaw;
    078            rotationX = MathHelper.cos(var6 * (float)Math.PI / 180.0F) * (float)(1 - var4 * 2);
    079            rotationZ = MathHelper.sin(var6 * (float)Math.PI / 180.0F) * (float)(1 - var4 * 2);
    080            rotationYZ = -rotationZ * MathHelper.sin(var5 * (float)Math.PI / 180.0F) * (float)(1 - var4 * 2);
    081            rotationXY = rotationX * MathHelper.sin(var5 * (float)Math.PI / 180.0F) * (float)(1 - var4 * 2);
    082            rotationXZ = MathHelper.cos(var5 * (float)Math.PI / 180.0F);
    083        }
    084
    085        /**
    086         * Returns a vector representing the projection along the given entity's view for the given distance
    087         */
    088        public static Vec3 projectViewFromEntity(EntityLiving par0EntityLiving, double par1)
    089        {
    090            double var3 = par0EntityLiving.prevPosX + (par0EntityLiving.posX - par0EntityLiving.prevPosX) * par1;
    091            double var5 = par0EntityLiving.prevPosY + (par0EntityLiving.posY - par0EntityLiving.prevPosY) * par1 + (double)par0EntityLiving.getEyeHeight();
    092            double var7 = par0EntityLiving.prevPosZ + (par0EntityLiving.posZ - par0EntityLiving.prevPosZ) * par1;
    093            double var9 = var3 + (double)(objectX * 1.0F);
    094            double var11 = var5 + (double)(objectY * 1.0F);
    095            double var13 = var7 + (double)(objectZ * 1.0F);
    096            return par0EntityLiving.worldObj.getWorldVec3Pool().getVecFromPool(var9, var11, var13);
    097        }
    098
    099        /**
    100         * Returns the block ID at the current camera location (either air or fluid), taking into account the height of
    101         * fluid blocks
    102         */
    103        public static int getBlockIdAtEntityViewpoint(World par0World, EntityLiving par1EntityLiving, float par2)
    104        {
    105            Vec3 var3 = projectViewFromEntity(par1EntityLiving, (double)par2);
    106            ChunkPosition var4 = new ChunkPosition(var3);
    107            int var5 = par0World.getBlockId(var4.x, var4.y, var4.z);
    108
    109            if (var5 != 0 && Block.blocksList[var5].blockMaterial.isLiquid())
    110            {
    111                float var6 = BlockFluid.getFluidHeightPercent(par0World.getBlockMetadata(var4.x, var4.y, var4.z)) - 0.11111111F;
    112                float var7 = (float)(var4.y + 1) - var6;
    113
    114                if (var3.yCoord >= (double)var7)
    115                {
    116                    var5 = par0World.getBlockId(var4.x, var4.y + 1, var4.z);
    117                }
    118            }
    119
    120            return var5;
    121        }
    122    }