surf.java

Jake2是一个Java 3D游戏引擎.

		gl.glDisableClientState(GL11.GL_TEXTURE_COORD_ARRAY);

		GL_EnableMultitexture( false );

		DrawTextureChains();
		R_DrawSkyBox();
		R_DrawTriangleOutlines();
	}

	final byte[] fatvis = new byte[Defines.MAX_MAP_LEAFS / 8];

	/**
	 * R_MarkLeaves
	 * Mark the leaves and nodes that are in the PVS for the current
	 * cluster
	 */
	void R_MarkLeaves()
	{
		if (r_oldviewcluster == r_viewcluster && r_oldviewcluster2 == r_viewcluster2 && r_novis.value == 0 && r_viewcluster != -1)
			return;

		// development aid to let you run around and see exactly where
		// the pvs ends
		if (gl_lockpvs.value != 0)
			return;

		r_visframecount++;
		r_oldviewcluster = r_viewcluster;
		r_oldviewcluster2 = r_viewcluster2;

		int i;
		if (r_novis.value != 0 || r_viewcluster == -1 || r_worldmodel.vis == null)
		{
			// mark everything
			for (i=0 ; i<r_worldmodel.numleafs ; i++)
				r_worldmodel.leafs[i].visframe = r_visframecount;
			for (i=0 ; i<r_worldmodel.numnodes ; i++)
				r_worldmodel.nodes[i].visframe = r_visframecount;
			return;
		}

		byte[] vis = Mod_ClusterPVS(r_viewcluster, r_worldmodel);
		int c;
		// may have to combine two clusters because of solid water boundaries
		if (r_viewcluster2 != r_viewcluster)
		{
			// memcpy (fatvis, vis, (r_worldmodel.numleafs+7)/8);
			System.arraycopy(vis, 0, fatvis, 0, (r_worldmodel.numleafs+7) >> 3);
			vis = Mod_ClusterPVS(r_viewcluster2, r_worldmodel);
			c = (r_worldmodel.numleafs + 31) >> 5;
			c <<= 2;
			for (int k=0 ; k<c ; k+=4) {
				fatvis[k] |= vis[k];
				fatvis[k + 1] |= vis[k + 1];
				fatvis[k + 2] |= vis[k + 2];
				fatvis[k + 3] |= vis[k + 3];
			}

			vis = fatvis;
		}

		mnode_t node;
		mleaf_t leaf;
		int cluster;
		for ( i=0; i < r_worldmodel.numleafs; i++)
		{
			leaf = r_worldmodel.leafs[i];
			cluster = leaf.cluster;
			if (cluster == -1)
				continue;
			if (((vis[cluster>>3] & 0xFF) & (1 << (cluster & 7))) != 0)
			{
				node = (mnode_t)leaf;
				do
				{
					if (node.visframe == r_visframecount)
						break;
					node.visframe = r_visframecount;
					node = node.parent;
				} while (node != null);
			}
		}
	}

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

	  LIGHTMAP ALLOCATION

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

	/**
	 * LM_InitBlock
	 */
	void LM_InitBlock()
	{
		Arrays.fill(gl_lms.allocated, 0);
	}

	/**
	 * LM_UploadBlock
	 * @param dynamic
	 */
	void LM_UploadBlock( boolean dynamic )
	{
		int texture = ( dynamic ) ? 0 : gl_lms.current_lightmap_texture;

		GL_Bind( gl_state.lightmap_textures + texture );
		gl.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);
		gl.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);

		gl_lms.lightmap_buffer.rewind();
		if ( dynamic )
		{
			int height = 0;
			for (int i = 0; i < BLOCK_WIDTH; i++ )
			{
				if ( gl_lms.allocated[i] > height )
					height = gl_lms.allocated[i];
			}

			gl.glTexSubImage2D( GL11.GL_TEXTURE_2D, 
							  0,
							  0, 0,
							  BLOCK_WIDTH, height,
							  GL_LIGHTMAP_FORMAT,
							  GL11.GL_UNSIGNED_BYTE,
							  gl_lms.lightmap_buffer );
		}
		else
		{
			gl.glTexImage2D( GL11.GL_TEXTURE_2D, 
						   0, 
						   gl_lms.internal_format,
						   BLOCK_WIDTH, BLOCK_HEIGHT, 
						   0, 
						   GL_LIGHTMAP_FORMAT, 
						   GL11.GL_UNSIGNED_BYTE, 
						   gl_lms.lightmap_buffer );
			if ( ++gl_lms.current_lightmap_texture == MAX_LIGHTMAPS )
				Com.Error( Defines.ERR_DROP, "LM_UploadBlock() - MAX_LIGHTMAPS exceeded\n" );
				
			//debugLightmap(gl_lms.lightmap_buffer, 128, 128, 4);
		}
	}

	/**
	 * LM_AllocBlock
	 * @param w
	 * @param h
	 * @param pos
	 * @return a texture number and the position inside it
	 */
	boolean LM_AllocBlock (int w, int h, pos_t pos)
	{
		int best = BLOCK_HEIGHT;
		int x = pos.x; 
		int y = pos.y;

		int best2;
		int i, j;
		for (i=0 ; i<BLOCK_WIDTH-w ; i++)
		{
			best2 = 0;

			for (j=0 ; j<w ; j++)
			{
				if (gl_lms.allocated[i+j] >= best)
					break;
				if (gl_lms.allocated[i+j] > best2)
					best2 = gl_lms.allocated[i+j];
			}
			if (j == w)
			{	// this is a valid spot
				pos.x = x = i;
				pos.y = y = best = best2;
			}
		}

		if (best + h > BLOCK_HEIGHT)
			return false;

		for (i=0 ; i<w ; i++)
			gl_lms.allocated[x + i] = best + h;

		return true;
	}

	/**
	 * GL_BuildPolygonFromSurface
	 */
	void GL_BuildPolygonFromSurface(msurface_t fa)
	{
		// reconstruct the polygon
		medge_t[] pedges = currentmodel.edges;
		int lnumverts = fa.numedges;
		int vertpage = 0;
		//
		// draw texture
		//
		// poly = Hunk_Alloc (sizeof(glpoly_t) + (lnumverts-4) * VERTEXSIZE*sizeof(float));
		glpoly_t poly = Polygon.create(lnumverts);

		poly.next = fa.polys;
		poly.flags = fa.flags;
		fa.polys = poly;

		int lindex;
		float[] vec;
		medge_t r_pedge;
		float s, t;
		for (int i=0 ; i<lnumverts ; i++)
		{
			lindex = currentmodel.surfedges[fa.firstedge + i];

			if (lindex > 0)
			{
				r_pedge = pedges[lindex];
				vec = currentmodel.vertexes[r_pedge.v[0]].position;
			}
			else
			{
				r_pedge = pedges[-lindex];
				vec = currentmodel.vertexes[r_pedge.v[1]].position;
			}
			s = Math3D.DotProduct (vec, fa.texinfo.vecs[0]) + fa.texinfo.vecs[0][3];
			s /= fa.texinfo.image.width;

			t = Math3D.DotProduct (vec, fa.texinfo.vecs[1]) + fa.texinfo.vecs[1][3];
			t /= fa.texinfo.image.height;

			poly.x(i, vec[0]);
			poly.y(i, vec[1]);
			poly.z(i, vec[2]);
			
			poly.s1(i, s);
			poly.t1(i, t);

			//
			// lightmap texture coordinates
			//
			s = Math3D.DotProduct (vec, fa.texinfo.vecs[0]) + fa.texinfo.vecs[0][3];
			s -= fa.texturemins[0];
			s += fa.light_s*16;
			s += 8;
			s /= BLOCK_WIDTH*16; //fa.texinfo.texture.width;

			t = Math3D.DotProduct (vec, fa.texinfo.vecs[1]) + fa.texinfo.vecs[1][3];
			t -= fa.texturemins[1];
			t += fa.light_t*16;
			t += 8;
			t /= BLOCK_HEIGHT*16; //fa.texinfo.texture.height;

			poly.s2(i, s);
			poly.t2(i, t);
		}
	}

	/**
	 * GL_CreateSurfaceLightmap
	 */
	void GL_CreateSurfaceLightmap(msurface_t surf)
	{
		if ( (surf.flags & (Defines.SURF_DRAWSKY | Defines.SURF_DRAWTURB)) != 0)
			return;

		int smax = (surf.extents[0]>>4)+1;
		int tmax = (surf.extents[1]>>4)+1;
		
		pos_t lightPos = new pos_t(surf.light_s, surf.light_t);

		if ( !LM_AllocBlock( smax, tmax, lightPos ) )
		{
			LM_UploadBlock( false );
			LM_InitBlock();
			lightPos = new pos_t(surf.light_s, surf.light_t);
			if ( !LM_AllocBlock( smax, tmax, lightPos ) )
			{
				Com.Error( Defines.ERR_FATAL, "Consecutive calls to LM_AllocBlock(" + smax +"," + tmax +") failed\n");
			}
		}
		
		// kopiere die koordinaten zurueck
		surf.light_s = lightPos.x;
		surf.light_t = lightPos.y;

		surf.lightmaptexturenum = gl_lms.current_lightmap_texture;
		
		IntBuffer base = gl_lms.lightmap_buffer;
		base.position(surf.light_t * BLOCK_WIDTH + surf.light_s);

		R_SetCacheState( surf );
		R_BuildLightMap(surf, base.slice(), BLOCK_WIDTH);
	}

	lightstyle_t[] lightstyles;
	private final IntBuffer dummy = BufferUtils.createIntBuffer(128*128);

	/**
	 * GL_BeginBuildingLightmaps
	 */
	void GL_BeginBuildingLightmaps(model_t m)
	{
		// static lightstyle_t	lightstyles[MAX_LIGHTSTYLES];
		int i;

		// init lightstyles
		if ( lightstyles == null ) {
			lightstyles = new lightstyle_t[Defines.MAX_LIGHTSTYLES];
			for (i = 0; i < lightstyles.length; i++)
			{
				lightstyles[i] = new lightstyle_t();				
			}
		}

		// memset( gl_lms.allocated, 0, sizeof(gl_lms.allocated) );
		Arrays.fill(gl_lms.allocated, 0);

		r_framecount = 1;		// no dlightcache

		GL_EnableMultitexture( true );
		GL_SelectTexture( GL_TEXTURE1);

		/*
		** setup the base lightstyles so the lightmaps won't have to be regenerated
		** the first time they're seen
		*/
		for (i=0 ; i < Defines.MAX_LIGHTSTYLES ; i++)
		{
			lightstyles[i].rgb[0] = 1;
			lightstyles[i].rgb[1] = 1;
			lightstyles[i].rgb[2] = 1;
			lightstyles[i].white = 3;
		}
		r_newrefdef.lightstyles = lightstyles;

		if (gl_state.lightmap_textures == 0)
		{
			gl_state.lightmap_textures = TEXNUM_LIGHTMAPS;
		}

		gl_lms.current_lightmap_texture = 1;

		/*
		** if mono lightmaps are enabled and we want to use alpha
		** blending (a,1-a) then we're likely running on a 3DLabs
		** Permedia2.  In a perfect world we'd use a GL_ALPHA lightmap
		** in order to conserve space and maximize bandwidth, however 
		** this isn't a perfect world.
		**
		** So we have to use alpha lightmaps, but stored in GL_RGBA format,
		** which means we only get 1/16th the color resolution we should when
		** using alpha lightmaps.  If we find another board that supports
		** only alpha lightmaps but that can at least support the GL_ALPHA
		** format then we should change this code to use real alpha maps.
		*/
		
		char format = gl_monolightmap.string.toUpperCase().charAt(0);
		
		if ( format == 'A' )
		{
			gl_lms.internal_format = gl_tex_alpha_format;
		}
		/*
		** try to do hacked colored lighting with a blended texture
		*/
		else if ( format == 'C' )
		{
			gl_lms.internal_format = gl_tex_alpha_format;
		}
		else if ( format == 'I' )
		{
			gl_lms.internal_format = GL11.GL_INTENSITY8;
		}
		else if ( format == 'L' ) 
		{
			gl_lms.internal_format = GL11.GL_LUMINANCE8;
		}
		else
		{
			gl_lms.internal_format = gl_tex_solid_format;
		}

		/*
		** initialize the dynamic lightmap texture
		*/
		GL_Bind( gl_state.lightmap_textures + 0 );
		gl.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);
		gl.glTexParameterf(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);
		gl.glTexImage2D( GL11.GL_TEXTURE_2D, 
					   0, 
					   gl_lms.internal_format,
					   BLOCK_WIDTH, BLOCK_HEIGHT, 
					   0, 
					   GL_LIGHTMAP_FORMAT, 
					   GL11.GL_UNSIGNED_BYTE, 
					   dummy );
	}

	/**
	 * GL_EndBuildingLightmaps
	 */
	void GL_EndBuildingLightmaps()
	{
		LM_UploadBlock( false );
		GL_EnableMultitexture( false );
	}
	
	/*
	 * new buffers for vertex array handling
	 */
	static FloatBuffer globalPolygonInterleavedBuf = Polygon.getInterleavedBuffer();
	static FloatBuffer globalPolygonTexCoord1Buf = null;

	static {
	 	globalPolygonInterleavedBuf.position(Polygon.STRIDE - 2);
	 	globalPolygonTexCoord1Buf = globalPolygonInterleavedBuf.slice();
		globalPolygonInterleavedBuf.position(0);
	 };

	//ImageFrame frame;
	
//	void debugLightmap(byte[] buf, int w, int h, float scale) {
//		IntBuffer pix = ByteBuffer.wrap(buf).order(ByteOrder.LITTLE_ENDIAN).asIntBuffer();
//		
//		int[] pixel = new int[w * h];
//		
//		pix.get(pixel);
//		
//		BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_4BYTE_ABGR);
//		image.setRGB(0,  0, w, h, pixel, 0, w);
//		AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(scale, scale), AffineTransformOp.TYPE_NEAREST_NEIGHBOR);
//		BufferedImage tmp = op.filter(image, null);
//		
//		if (frame == null) {
//			frame = new ImageFrame(null);
//			frame.show();
//		} 
//		frame.showImage(tmp);
//		
//	}

}