light.java

Jake2是一个Java 3D游戏引擎.

//	  ===================================================================

	float[] s_blocklights = new float[34 * 34 * 3];
	
// TODO sync with jogl renderer. hoz
	private final float[] impact = {0, 0, 0};
	/**
	 * R_AddDynamicLights
	 */
	void R_AddDynamicLights(msurface_t surf)
	{
		int sd, td;
		float fdist, frad, fminlight;
		int s, t;
		dlight_t dl;
		float[] pfBL;
		float fsacc, ftacc;

		int smax = (surf.extents[0]>>4)+1;
		int tmax = (surf.extents[1]>>4)+1;
		mtexinfo_t tex = surf.texinfo;

		float local0, local1;
		for (int lnum=0 ; lnum<r_newrefdef.num_dlights ; lnum++)
		{
			if ( (surf.dlightbits & (1<<lnum)) == 0 )
				continue;		// not lit by this light

			dl = r_newrefdef.dlights[lnum];
			frad = dl.intensity;
			fdist = Math3D.DotProduct (dl.origin, surf.plane.normal) -
					surf.plane.dist;
			frad -= Math.abs(fdist);
			// rad is now the highest intensity on the plane

			fminlight = DLIGHT_CUTOFF;	// FIXME: make configurable?
			if (frad < fminlight)
				continue;
			fminlight = frad - fminlight;

			for (int i=0 ; i<3 ; i++)
			{
				impact[i] = dl.origin[i] -
						surf.plane.normal[i]*fdist;
			}

			local0 = Math3D.DotProduct (impact, tex.vecs[0]) + tex.vecs[0][3] - surf.texturemins[0];
			local1 = Math3D.DotProduct (impact, tex.vecs[1]) + tex.vecs[1][3] - surf.texturemins[1];

			pfBL = s_blocklights;
			int pfBLindex = 0;
			for (t = 0, ftacc = 0 ; t<tmax ; t++, ftacc += 16)
			{
				td = (int)(local1 - ftacc);
				if ( td < 0 )
					td = -td;

				for (s=0, fsacc = 0 ; s<smax ; s++, fsacc += 16, pfBLindex += 3)
				{
					sd = (int)( local0 - fsacc );

					if ( sd < 0 )
						sd = -sd;

					if (sd > td)
						fdist = sd + (td>>1);
					else
						fdist = td + (sd>>1);

					if ( fdist < fminlight )
					{
						pfBL[pfBLindex + 0] += ( frad - fdist ) * dl.color[0];
						pfBL[pfBLindex + 1] += ( frad - fdist ) * dl.color[1];
						pfBL[pfBLindex + 2] += ( frad - fdist ) * dl.color[2];
					}
				}
			}
		}
	}

	/**
	 * R_SetCacheState
	 */
	void R_SetCacheState( msurface_t surf )
	{
		for (int maps = 0 ; maps < Defines.MAXLIGHTMAPS && surf.styles[maps] != (byte)255 ; maps++)
		{
			surf.cached_light[maps] = r_newrefdef.lightstyles[surf.styles[maps] & 0xFF].white;
		}
	}
	
	private Throwable gotoStore = new Throwable();

//	TODO sync with jogl renderer. hoz
	/**
	 * R_BuildLightMap
	 * 
	 * Combine and scale multiple lightmaps into the floating format in blocklights
	 */
	void R_BuildLightMap(msurface_t surf, IntBuffer dest, int stride)
	{
        int r, g, b, a, max;
        int i, j;
        int nummaps;
        float[] bl;
        //lightstyle_t style;

        if ((surf.texinfo.flags & (Defines.SURF_SKY | Defines.SURF_TRANS33
                | Defines.SURF_TRANS66 | Defines.SURF_WARP)) != 0)
            Com.Error(Defines.ERR_DROP,
                    "R_BuildLightMap called for non-lit surface");

        int smax = (surf.extents[0] >> 4) + 1;
        int tmax = (surf.extents[1] >> 4) + 1;
        int size = smax * tmax;
        if (size > ((s_blocklights.length * Defines.SIZE_OF_FLOAT) >> 4))
            Com.Error(Defines.ERR_DROP, "Bad s_blocklights size");

        try {
            // set to full bright if no light data
            if (surf.samples == null) {
                int maps;

                for (i = 0; i < size * 3; i++)
                    s_blocklights[i] = 255;

                // TODO useless? hoz
                //				for (maps = 0 ; maps < Defines.MAXLIGHTMAPS &&
                // surf.styles[maps] != (byte)255; maps++)
                //				{
                //					style = r_newrefdef.lightstyles[surf.styles[maps] & 0xFF];
                //				}

                // goto store;
                throw gotoStore;
            }

            // count the # of maps
            for (nummaps = 0; nummaps < Defines.MAXLIGHTMAPS
                    && surf.styles[nummaps] != (byte) 255; nummaps++)
                ;

            ByteBuffer lightmap = surf.samples;
            int lightmapIndex = 0;

            // add all the lightmaps
            float scale0;
            float scale1;
            float scale2;
            if (nummaps == 1) {
                int maps;

                for (maps = 0; maps < Defines.MAXLIGHTMAPS
                        && surf.styles[maps] != (byte) 255; maps++) {
                    bl = s_blocklights;
                    int blp = 0;

//                    for (i = 0; i < 3; i++)
//                        scale[i] = gl_modulate.value
//                                * r_newrefdef.lightstyles[surf.styles[maps] & 0xFF].rgb[i];
                    scale0 = gl_modulate.value * r_newrefdef.lightstyles[surf.styles[maps] & 0xFF].rgb[0];
                    scale1 = gl_modulate.value * r_newrefdef.lightstyles[surf.styles[maps] & 0xFF].rgb[1];
                    scale2 = gl_modulate.value * r_newrefdef.lightstyles[surf.styles[maps] & 0xFF].rgb[2];

                    if (scale0 == 1.0F && scale1 == 1.0F
                            && scale2 == 1.0F) {
                        for (i = 0; i < size; i++) {
                            bl[blp++] = lightmap.get(lightmapIndex++) & 0xFF;
                            bl[blp++] = lightmap.get(lightmapIndex++) & 0xFF;
                            bl[blp++] = lightmap.get(lightmapIndex++) & 0xFF;
                        }
                    } else {
                        for (i = 0; i < size; i++) {
                            bl[blp++] = (lightmap.get(lightmapIndex++) & 0xFF)
                                    * scale0;
                            bl[blp++] = (lightmap.get(lightmapIndex++) & 0xFF)
                                    * scale1;
                            bl[blp++] = (lightmap.get(lightmapIndex++) & 0xFF)
                                    * scale2;
                        }
                    }
                    //lightmap += size*3; // skip to next lightmap
                }
            } else {
                int maps;

                //			memset( s_blocklights, 0, sizeof( s_blocklights[0] ) * size *
                // 3 );

                Arrays.fill(s_blocklights, 0, size * 3, 0.0f);

                for (maps = 0; maps < Defines.MAXLIGHTMAPS
                        && surf.styles[maps] != (byte) 255; maps++) {
                    bl = s_blocklights;
                    int blp = 0;

//                    for (i = 0; i < 3; i++)
//                        scale[i] = gl_modulate.value
//                                * r_newrefdef.lightstyles[surf.styles[maps] & 0xFF].rgb[i];
                    scale0 = gl_modulate.value
                    * r_newrefdef.lightstyles[surf.styles[maps] & 0xFF].rgb[0];
                    scale1 = gl_modulate.value
                    * r_newrefdef.lightstyles[surf.styles[maps] & 0xFF].rgb[1];
                    scale2 = gl_modulate.value
                    * r_newrefdef.lightstyles[surf.styles[maps] & 0xFF].rgb[2];




                    if (scale0 == 1.0F && scale1 == 1.0F
                            && scale2 == 1.0F) {
                        for (i = 0; i < size; i++) {
                            bl[blp++] += lightmap.get(lightmapIndex++) & 0xFF;
                            bl[blp++] += lightmap.get(lightmapIndex++) & 0xFF;
                            bl[blp++] += lightmap.get(lightmapIndex++) & 0xFF;
                        }
                    } else {
                        for (i = 0; i < size; i++) {
                            bl[blp++] += (lightmap.get(lightmapIndex++) & 0xFF)
                                    * scale0;
                            bl[blp++] += (lightmap.get(lightmapIndex++) & 0xFF)
                                    * scale1;
                            bl[blp++] += (lightmap.get(lightmapIndex++) & 0xFF)
                                    * scale2;
                        }
                    }
                    //lightmap += size*3; // skip to next lightmap
                }
            }

            // add all the dynamic lights
            if (surf.dlightframe == r_framecount)
                R_AddDynamicLights(surf);

            // label store:
        } catch (Throwable store) {
        }

        // put into texture format
        stride -= smax;
        bl = s_blocklights;
        int blp = 0;

        int monolightmap = gl_monolightmap.string.charAt(0);

        int destp = 0;

        if (monolightmap == '0') {
            for (i = 0; i < tmax; i++, destp += stride) {
                //dest.position(destp);

                for (j = 0; j < smax; j++) {

                    r = (int) bl[blp++];
                    g = (int) bl[blp++];
                    b = (int) bl[blp++];

                    // catch negative lights
                    if (r < 0)
                        r = 0;
                    if (g < 0)
                        g = 0;
                    if (b < 0)
                        b = 0;

                    /*
                     * * determine the brightest of the three color components
                     */
                    if (r > g)
                        max = r;
                    else
                        max = g;
                    if (b > max)
                        max = b;

                    /*
                     * * alpha is ONLY used for the mono lightmap case. For this
                     * reason * we set it to the brightest of the color
                     * components so that * things don't get too dim.
                     */
                    a = max;

                    /*
                     * * rescale all the color components if the intensity of
                     * the greatest * channel exceeds 1.0
                     */
                    if (max > 255) {
                        float t = 255.0F / max;

                        r = (int) (r * t);
                        g = (int) (g * t);
                        b = (int) (b * t);
                        a = (int) (a * t);
                    }
                    //r &= 0xFF; g &= 0xFF; b &= 0xFF; a &= 0xFF;
                    dest.put(destp++, (a << 24) | (b << 16) | (g << 8) | r);
                }
            }
        } else {
            for (i = 0; i < tmax; i++, destp += stride) {
                //dest.position(destp);

                for (j = 0; j < smax; j++) {

                    r = (int) bl[blp++];
                    g = (int) bl[blp++];
                    b = (int) bl[blp++];

                    // catch negative lights
                    if (r < 0)
                        r = 0;
                    if (g < 0)
                        g = 0;
                    if (b < 0)
                        b = 0;

                    /*
                     * * determine the brightest of the three color components
                     */
                    if (r > g)
                        max = r;
                    else
                        max = g;
                    if (b > max)
                        max = b;

                    /*
                     * * alpha is ONLY used for the mono lightmap case. For this
                     * reason * we set it to the brightest of the color
                     * components so that * things don't get too dim.
                     */
                    a = max;

                    /*
                     * * rescale all the color components if the intensity of
                     * the greatest * channel exceeds 1.0
                     */
                    if (max > 255) {
                        float t = 255.0F / max;

                        r = (int) (r * t);
                        g = (int) (g * t);
                        b = (int) (b * t);
                        a = (int) (a * t);
                    }

                    /*
                     * * So if we are doing alpha lightmaps we need to set the
                     * R, G, and B * components to 0 and we need to set alpha to
                     * 1-alpha.
                     */
                    switch (monolightmap) {
                    case 'L':
                    case 'I':
                        r = a;
                        g = b = 0;
                        break;
                    case 'C':
                        // try faking colored lighting
                        a = 255 - ((r + g + b) / 3);
                        float af = a / 255.0f;
                        r *= af;
                        g *= af;
                        b *= af;
                        break;
                    case 'A':
                    default:
                        r = g = b = 0;
                        a = 255 - a;
                        break;
                    }
                    //r &= 0xFF; g &= 0xFF; b &= 0xFF; a &= 0xFF;
                    dest.put(destp++, (a << 24) | (b << 16) | (g << 8) | r);
                }
            }
        }
    }

}