mesh.java

Jake2是一个Java 3D游戏引擎.

/*
 * Mesh.java
 * Copyright (C) 2003
 *
 * $Id: Mesh.java,v 1.8 2005/06/08 21:27:10 cawe Exp $
 */
/*
Copyright (C) 1997-2001 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
package jake2.render.lwjgl;

import jake2.Defines;
import jake2.client.VID;
import jake2.client.entity_t;
import jake2.qcommon.qfiles;
import jake2.render.image_t;
import jake2.util.Math3D;

import java.nio.FloatBuffer;
import java.nio.IntBuffer;

import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL11;

/**
 * Mesh
 *  
 * @author cwei
 */
public abstract class Mesh extends Light {

	// g_mesh.c: triangle model functions
	/*
	=============================================================

	  ALIAS MODELS

	=============================================================
	*/

	static final int NUMVERTEXNORMALS =	162;

	float[][] r_avertexnormals = Anorms.VERTEXNORMALS;
	float[] shadevector = {0, 0, 0};
	float[] shadelight = {0, 0, 0};

	// precalculated dot products for quantized angles
	static final int SHADEDOT_QUANT = 16;

	float[][]	r_avertexnormal_dots = Anorms.VERTEXNORMAL_DOTS;

	float[] shadedots = r_avertexnormal_dots[0];

	/**
	 * GL_LerpVerts
	 * @param nverts
	 * @param ov
	 * @param verts
	 * @param move
	 * @param frontv
	 * @param backv
	 */
	void GL_LerpVerts(int nverts, int[] ov, int[] v, float[] move, float[] frontv, float[] backv )
	{
		FloatBuffer lerp = vertexArrayBuf;
		lerp.limit((nverts << 2) - nverts); // nverts * 3

		int ovv, vv;
			//PMM -- added RF_SHELL_DOUBLE, RF_SHELL_HALF_DAM
		if ( (currententity.flags & ( Defines.RF_SHELL_RED | Defines.RF_SHELL_GREEN | Defines.RF_SHELL_BLUE | Defines.RF_SHELL_DOUBLE | Defines.RF_SHELL_HALF_DAM)) != 0 )
		{
			float[] normal;
			int j = 0;
			for (int i=0 ; i < nverts; i++/* , v++, ov++, lerp+=4 */)
			{
				vv = v[i];
				normal = r_avertexnormals[(vv >>> 24 ) & 0xFF];
				ovv = ov[i];
				lerp.put(j, move[0] + (ovv & 0xFF)* backv[0] + (vv & 0xFF) * frontv[0] + normal[0] * Defines.POWERSUIT_SCALE);
				lerp.put(j + 1, move[1] + ((ovv >>> 8) & 0xFF) * backv[1] + ((vv >>> 8) & 0xFF) * frontv[1] + normal[1] * Defines.POWERSUIT_SCALE);
				lerp.put(j + 2, move[2] + ((ovv >>> 16) & 0xFF) * backv[2] + ((vv >>> 16) & 0xFF) * frontv[2] + normal[2] * Defines.POWERSUIT_SCALE); 
				j += 3;
			}
		}
		else
		{
			int j = 0;
			for (int i=0 ; i < nverts; i++ /* , v++, ov++, lerp+=4 */)
			{
				ovv = ov[i];
				vv = v[i];
				
				lerp.put(j, move[0] + (ovv & 0xFF)* backv[0] + (vv & 0xFF)*frontv[0]);
				lerp.put(j + 1, move[1] + ((ovv >>> 8) & 0xFF)* backv[1] + ((vv >>> 8) & 0xFF)*frontv[1]);
				lerp.put(j + 2, move[2] + ((ovv >>> 16) & 0xFF)* backv[2] + ((vv >>> 16) & 0xFF)*frontv[2]);
				j += 3;
			}
		}
	}

	FloatBuffer colorArrayBuf = BufferUtils.createFloatBuffer(qfiles.MAX_VERTS * 4);
	FloatBuffer vertexArrayBuf = BufferUtils.createFloatBuffer(qfiles.MAX_VERTS * 3);
	FloatBuffer textureArrayBuf = BufferUtils.createFloatBuffer(qfiles.MAX_VERTS * 2);
	boolean isFilled = false;
	float[] tmpVec = {0, 0, 0};
	float[][] vectors = {
		{0, 0, 0}, {0, 0, 0}, {0, 0, 0} // 3 mal vec3_t
	};
	
	// stack variable
	private final float[] move = {0, 0, 0}; // vec3_t		
	private final float[] frontv = {0, 0, 0}; // vec3_t
	private final float[] backv = {0, 0, 0}; // vec3_t
	/**
	 * GL_DrawAliasFrameLerp
	 * 
	 * interpolates between two frames and origins
	 * FIXME: batch lerp all vertexes
	 */
	void GL_DrawAliasFrameLerp(qfiles.dmdl_t paliashdr, float backlerp)
	{
		qfiles.daliasframe_t frame = paliashdr.aliasFrames[currententity.frame];

		int[] verts = frame.verts;

		qfiles.daliasframe_t oldframe = paliashdr.aliasFrames[currententity.oldframe];

		int[] ov = oldframe.verts;

		float	alpha;
		if ((currententity.flags & Defines.RF_TRANSLUCENT) != 0)
			alpha = currententity.alpha;
		else
			alpha = 1.0f;

		// PMM - added double shell
		if ( (currententity.flags & ( Defines.RF_SHELL_RED | Defines.RF_SHELL_GREEN | Defines.RF_SHELL_BLUE | Defines.RF_SHELL_DOUBLE | Defines.RF_SHELL_HALF_DAM)) != 0)
			gl.glDisable( GL11.GL_TEXTURE_2D );

		float frontlerp = 1.0f - backlerp;

		// move should be the delta back to the previous frame * backlerp
		Math3D.VectorSubtract (currententity.oldorigin, currententity.origin, frontv);
		Math3D.AngleVectors (currententity.angles, vectors[0], vectors[1], vectors[2]);

		move[0] = Math3D.DotProduct (frontv, vectors[0]);	// forward
		move[1] = -Math3D.DotProduct (frontv, vectors[1]);	// left
		move[2] = Math3D.DotProduct (frontv, vectors[2]);	// up

		Math3D.VectorAdd (move, oldframe.translate, move);

		for (int i=0 ; i<3 ; i++)
		{
			move[i] = backlerp*move[i] + frontlerp*frame.translate[i];
			frontv[i] = frontlerp*frame.scale[i];
			backv[i] = backlerp*oldframe.scale[i];
		}
		
		// ab hier wird optimiert

		GL_LerpVerts( paliashdr.num_xyz, ov, verts, move, frontv, backv );
		
		//gl.glEnableClientState( GL11.GL_VERTEX_ARRAY );
		gl.glVertexPointer( 3, 0, vertexArrayBuf );

		// PMM - added double damage shell
		if ( (currententity.flags & ( Defines.RF_SHELL_RED | Defines.RF_SHELL_GREEN | Defines.RF_SHELL_BLUE | Defines.RF_SHELL_DOUBLE | Defines.RF_SHELL_HALF_DAM)) != 0)
		{
			gl.glColor4f( shadelight[0], shadelight[1], shadelight[2], alpha );
		}
		else
		{
			gl.glEnableClientState( GL11.GL_COLOR_ARRAY );
			gl.glColorPointer( 4, 0, colorArrayBuf );

			//
			// pre light everything
			//
			FloatBuffer color = colorArrayBuf;
			float l;
			int size = paliashdr.num_xyz;
			int j = 0;
			for (int i = 0; i < size; i++ )
			{
				l = shadedots[(verts[i] >>> 24) & 0xFF];
				color.put(j,  l * shadelight[0]);
				color.put(j + 1, l * shadelight[1]);
				color.put(j + 2, l * shadelight[2]);
				color.put(j + 3, alpha);
				j += 4;
			}
		}

		gl.glClientActiveTextureARB(GL_TEXTURE0);
		gl.glTexCoordPointer( 2, 0, textureArrayBuf);
		//gl.glEnableClientState( GL11.GL_TEXTURE_COORD_ARRAY);

		int pos = 0;
		int[] counts = paliashdr.counts;
		
		IntBuffer srcIndexBuf = null;

		FloatBuffer dstTextureCoords = textureArrayBuf;
		FloatBuffer srcTextureCoords = paliashdr.textureCoordBuf;

		int dstIndex = 0;
		int srcIndex = 0;
		int count;
		int mode;
		int size = counts.length;
		for (int j = 0; j < size; j++) {

			// get the vertex count and primitive type
			count = counts[j];
			if (count == 0)
				break;		// done
				
			srcIndexBuf = paliashdr.indexElements[j];
			
			mode = GL11.GL_TRIANGLE_STRIP;
			if (count < 0) {
				mode = GL11.GL_TRIANGLE_FAN;
				count = -count;
			}
			srcIndex = pos << 1;
			srcIndex--;
			for (int k = 0; k < count; k++) {
				dstIndex = srcIndexBuf.get(k) << 1;
				dstTextureCoords.put(dstIndex, srcTextureCoords.get(++srcIndex));
				dstTextureCoords.put(++dstIndex, srcTextureCoords.get(++srcIndex));
			}
				
			gl.glDrawElements(mode, srcIndexBuf);
			pos += count;
		}

		// PMM - added double damage shell
		if ( (currententity.flags & ( Defines.RF_SHELL_RED | Defines.RF_SHELL_GREEN | Defines.RF_SHELL_BLUE | Defines.RF_SHELL_DOUBLE | Defines.RF_SHELL_HALF_DAM)) != 0 )
			gl.glEnable( GL11.GL_TEXTURE_2D );

		gl.glDisableClientState( GL11.GL_COLOR_ARRAY );
	}
			
	private final float[] point = {0, 0, 0};
	/**
	 * GL_DrawAliasShadow
	 */
	void GL_DrawAliasShadow(qfiles.dmdl_t paliashdr, int posenum)
	{
		float lheight = currententity.origin[2] - lightspot[2];
		qfiles.daliasframe_t frame = paliashdr.aliasFrames[currententity.frame];
		int[] order = paliashdr.glCmds;
		float height = -lheight + 1.0f;
		
		int orderIndex = 0;
		int index = 0;

		// TODO shadow drawing with vertex arrays

		int count;
		while (true)
		{
			// get the vertex count and primitive type
			count = order[orderIndex++];
			if (count == 0)
				break;		// done
			if (count < 0)
			{
				count = -count;
				gl.glBegin (GL11.GL_TRIANGLE_FAN);
			}
			else
				gl.glBegin (GL11.GL_TRIANGLE_STRIP);

			do
			{
				index = order[orderIndex + 2] * 3;
				point[0] = vertexArrayBuf.get(index);
				point[1] = vertexArrayBuf.get(index + 1);
				point[2] = vertexArrayBuf.get(index + 2);
					
				point[0] -= shadevector[0]*(point[2]+lheight);
				point[1] -= shadevector[1]*(point[2]+lheight);
				point[2] = height;
				gl.glVertex3f(point[0], point[1], point[2]);

				orderIndex += 3;

			} while (--count != 0);

			gl.glEnd ();
		}	
	}

//	TODO sync with jogl renderer. hoz
	// stack variable
	private final float[] mins = { 0, 0, 0 };
	private final float[] maxs = { 0, 0, 0 };
	/**
	 * R_CullAliasModel
	*/
	boolean R_CullAliasModel(entity_t e) {
		qfiles.dmdl_t paliashdr = (qfiles.dmdl_t) currentmodel.extradata;

		if ((e.frame >= paliashdr.num_frames) || (e.frame < 0)) {
			VID.Printf(Defines.PRINT_ALL, "R_CullAliasModel " + currentmodel.name + ": no such frame " + e.frame + '\n');
			e.frame = 0;
		}
		if ((e.oldframe >= paliashdr.num_frames) || (e.oldframe < 0)) {
			VID.Printf(Defines.PRINT_ALL, "R_CullAliasModel " + currentmodel.name + ": no such oldframe " + e.oldframe + '\n');
			e.oldframe = 0;
		}

		qfiles.daliasframe_t pframe = paliashdr.aliasFrames[e.frame];
		qfiles.daliasframe_t poldframe = paliashdr.aliasFrames[e.oldframe];

		/*
		** compute axially aligned mins and maxs
		*/
		if (pframe == poldframe) {
			for (int i = 0; i < 3; i++) {
				mins[i] = pframe.translate[i];
				maxs[i] = mins[i] + pframe.scale[i] * 255;
			}
		} else {
			float thismaxs, oldmaxs;
			for (int i = 0; i < 3; i++) {
				thismaxs = pframe.translate[i] + pframe.scale[i] * 255;