mesh.java

Jake2是一个Java 3D游戏引擎.

                 * frame.translate[0]; point[1] = verts[order[2]].v[1] *
                 * frame.scale[1] + frame.translate[1]; point[2] =
                 * verts[order[2]].v[2] * frame.scale[2] + frame.translate[2];
                 */

                if (gl_vertex_arrays.value != 0.0f) {
                    index = order[orderIndex + 2] * 3;
                    point[0] = vertexArrayBuf.get(index);
                    point[1] = vertexArrayBuf.get(index + 1);
                    point[2] = vertexArrayBuf.get(index + 2);
                } else {
                    Math3D.VectorCopy(s_lerped[order[orderIndex + 2]], point);
                }

                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();
        }
    }

    /*
     * * R_CullAliasModel
     */
    boolean R_CullAliasModel(float[][] bbox, entity_t e) {
        int i;
        float[] mins = { 0, 0, 0 };
        float[] maxs = { 0, 0, 0 };

        qfiles.dmdl_t paliashdr;

        float[][] vectors = { { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 } };

        float[] thismins = { 0, 0, 0 };
        float[] oldmins = { 0, 0, 0 };
        float[] thismaxs = { 0, 0, 0 };
        float[] oldmaxs = { 0, 0, 0 };
        qfiles.daliasframe_t pframe, poldframe;
        float[] angles = { 0, 0, 0 };

        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;
        }

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

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

                oldmins[i] = poldframe.translate[i];
                oldmaxs[i] = oldmins[i] + poldframe.scale[i] * 255;

                if (thismins[i] < oldmins[i])
                    mins[i] = thismins[i];
                else
                    mins[i] = oldmins[i];

                if (thismaxs[i] > oldmaxs[i])
                    maxs[i] = thismaxs[i];
                else
                    maxs[i] = oldmaxs[i];
            }
        }

        /*
         * * compute a full bounding box
         */
        for (i = 0; i < 8; i++) {
            float[] tmp = { 0, 0, 0 };

            if ((i & 1) != 0)
                tmp[0] = mins[0];
            else
                tmp[0] = maxs[0];

            if ((i & 2) != 0)
                tmp[1] = mins[1];
            else
                tmp[1] = maxs[1];

            if ((i & 4) != 0)
                tmp[2] = mins[2];
            else
                tmp[2] = maxs[2];

            Math3D.VectorCopy(tmp, bbox[i]);
        }

        /*
         * * rotate the bounding box
         */
        Math3D.VectorCopy(e.angles, angles);
        angles[YAW] = -angles[YAW];
        Math3D.AngleVectors(angles, vectors[0], vectors[1], vectors[2]);

        for (i = 0; i < 8; i++) {
            float[] tmp = { 0, 0, 0 };

            Math3D.VectorCopy(bbox[i], tmp);

            bbox[i][0] = Math3D.DotProduct(vectors[0], tmp);
            bbox[i][1] = -Math3D.DotProduct(vectors[1], tmp);
            bbox[i][2] = Math3D.DotProduct(vectors[2], tmp);

            Math3D.VectorAdd(e.origin, bbox[i], bbox[i]);
        }

        {
            int p, f;
            int aggregatemask = ~0; // 0xFFFFFFFF

            for (p = 0; p < 8; p++) {
                int mask = 0;

                for (f = 0; f < 4; f++) {
                    float dp = Math3D.DotProduct(frustum[f].normal, bbox[p]);

                    if ((dp - frustum[f].dist) < 0) {
                        mask |= (1 << f);
                    }
                }

                aggregatemask &= mask;
            }

            if (aggregatemask != 0) {
                return true;
            }

            return false;
        }
    }

    /*
     * ================= R_DrawAliasModel
     * 
     * =================
     */
    void R_DrawAliasModel(entity_t e) {
        int i;
        qfiles.dmdl_t paliashdr;
        float an;

        // bounding box
        float[][] bbox = { { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 },
                { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 }, { 0, 0, 0 } };
        image_t skin;

        if ((e.flags & Defines.RF_WEAPONMODEL) == 0) {
            if (R_CullAliasModel(bbox, e))
                return;
        }

        if ((e.flags & Defines.RF_WEAPONMODEL) != 0) {
            if (r_lefthand.value == 2.0f)
                return;
        }

        paliashdr = (qfiles.dmdl_t) currentmodel.extradata;

        //
        // get lighting information
        //
        // PMM - rewrote, reordered to handle new shells & mixing
        // PMM - 3.20 code .. replaced with original way of doing it to keep mod
        // authors happy
        //
        if ((currententity.flags & (Defines.RF_SHELL_HALF_DAM
                | Defines.RF_SHELL_GREEN | Defines.RF_SHELL_RED
                | Defines.RF_SHELL_BLUE | Defines.RF_SHELL_DOUBLE)) != 0) {
            Math3D.VectorClear(shadelight);
            if ((currententity.flags & Defines.RF_SHELL_HALF_DAM) != 0) {
                shadelight[0] = 0.56f;
                shadelight[1] = 0.59f;
                shadelight[2] = 0.45f;
            }
            if ((currententity.flags & Defines.RF_SHELL_DOUBLE) != 0) {
                shadelight[0] = 0.9f;
                shadelight[1] = 0.7f;
            }
            if ((currententity.flags & Defines.RF_SHELL_RED) != 0)
                shadelight[0] = 1.0f;
            if ((currententity.flags & Defines.RF_SHELL_GREEN) != 0)
                shadelight[1] = 1.0f;
            if ((currententity.flags & Defines.RF_SHELL_BLUE) != 0)
                shadelight[2] = 1.0f;
        }

        else if ((currententity.flags & Defines.RF_FULLBRIGHT) != 0) {
            for (i = 0; i < 3; i++)
                shadelight[i] = 1.0f;
        } else {
            R_LightPoint(currententity.origin, shadelight);

            // player lighting hack for communication back to server
            // big hack!
            if ((currententity.flags & Defines.RF_WEAPONMODEL) != 0) {
                // pick the greatest component, which should be the same
                // as the mono value returned by software
                if (shadelight[0] > shadelight[1]) {
                    if (shadelight[0] > shadelight[2])
                        r_lightlevel.value = 150 * shadelight[0];
                    else
                        r_lightlevel.value = 150 * shadelight[2];
                } else {
                    if (shadelight[1] > shadelight[2])
                        r_lightlevel.value = 150 * shadelight[1];
                    else
                        r_lightlevel.value = 150 * shadelight[2];
                }
            }

            if (gl_monolightmap.string.charAt(0) != '0') {
                float s = shadelight[0];

                if (s < shadelight[1])
                    s = shadelight[1];
                if (s < shadelight[2])
                    s = shadelight[2];

                shadelight[0] = s;
                shadelight[1] = s;
                shadelight[2] = s;
            }
        }

        if ((currententity.flags & Defines.RF_MINLIGHT) != 0) {
            for (i = 0; i < 3; i++)
                if (shadelight[i] > 0.1f)
                    break;
            if (i == 3) {
                shadelight[0] = 0.1f;
                shadelight[1] = 0.1f;
                shadelight[2] = 0.1f;
            }
        }

        if ((currententity.flags & Defines.RF_GLOW) != 0) { // bonus items will
                                                            // pulse with time
            float scale;
            float min;

            scale = (float) (0.1f * Math.sin(r_newrefdef.time * 7));
            for (i = 0; i < 3; i++) {
                min = shadelight[i] * 0.8f;
                shadelight[i] += scale;
                if (shadelight[i] < min)
                    shadelight[i] = min;
            }
        }

        // =================
        // PGM ir goggles color override
        if ((r_newrefdef.rdflags & Defines.RDF_IRGOGGLES) != 0
                && (currententity.flags & Defines.RF_IR_VISIBLE) != 0) {
            shadelight[0] = 1.0f;
            shadelight[1] = 0.0f;
            shadelight[2] = 0.0f;
        }
        // PGM
        // =================

        shadedots = r_avertexnormal_dots[((int) (currententity.angles[1] * (SHADEDOT_QUANT / 360.0)))
                & (SHADEDOT_QUANT - 1)];

        an = (float) (currententity.angles[1] / 180 * Math.PI);
        shadevector[0] = (float) Math.cos(-an);
        shadevector[1] = (float) Math.sin(-an);
        shadevector[2] = 1;
        Math3D.VectorNormalize(shadevector);

        //
        // locate the proper data
        //

        c_alias_polys += paliashdr.num_tris;

        //
        // draw all the triangles
        //
        if ((currententity.flags & Defines.RF_DEPTHHACK) != 0)
            // hack the depth range to prevent view model from poking into walls
            gl.glDepthRange(gldepthmin, gldepthmin + 0.3
                    * (gldepthmax - gldepthmin));

        if ((currententity.flags & Defines.RF_WEAPONMODEL) != 0
                && (r_lefthand.value == 1.0f)) {
            gl.glMatrixMode(GL.GL_PROJECTION);
            gl.glPushMatrix();
            gl.glLoadIdentity();
            gl.glScalef(-1, 1, 1);
            MYgluPerspective(r_newrefdef.fov_y, (float) r_newrefdef.width
                    / r_newrefdef.height, 4, 4096);
            gl.glMatrixMode(GL.GL_MODELVIEW);

            gl.glCullFace(GL.GL_BACK);
        }

        gl.glPushMatrix();
        e.angles[PITCH] = -e.angles[PITCH]; // sigh.
        R_RotateForEntity(e);
        e.angles[PITCH] = -e.angles[PITCH]; // sigh.

        // select skin
        if (currententity.skin != null)
            skin = currententity.skin; // custom player skin
        else {
            if (currententity.skinnum >= qfiles.MAX_MD2SKINS)
                skin = currentmodel.skins[0];
            else {
                skin = currentmodel.skins[currententity.skinnum];
                if (skin == null)
                    skin = currentmodel.skins[0];
            }
        }
        if (skin == null)
            skin = r_notexture; // fallback...
        GL_Bind(skin.texnum);

        // draw it

        gl.glShadeModel(GL.GL_SMOOTH);

        GL_TexEnv(GL.GL_MODULATE);
        if ((currententity.flags & Defines.RF_TRANSLUCENT) != 0) {
            gl.glEnable(GL.GL_BLEND);
        }

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

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

        if (r_lerpmodels.value == 0.0f)
            currententity.backlerp = 0;
        GL_DrawAliasFrameLerp(paliashdr, currententity.backlerp);

        GL_TexEnv(GL.GL_REPLACE);
        gl.glShadeModel(GL.GL_FLAT);

        gl.glPopMatrix();

        if ((currententity.flags & Defines.RF_WEAPONMODEL) != 0
                && (r_lefthand.value == 1.0F)) {
            gl.glMatrixMode(GL.GL_PROJECTION);
            gl.glPopMatrix();
            gl.glMatrixMode(GL.GL_MODELVIEW);
            gl.glCullFace(GL.GL_FRONT);
        }

        if ((currententity.flags & Defines.RF_TRANSLUCENT) != 0) {
            gl.glDisable(GL.GL_BLEND);
        }

        if ((currententity.flags & Defines.RF_DEPTHHACK) != 0)
            gl.glDepthRange(gldepthmin, gldepthmax);

        if (gl_shadows.value != 0.0f
                && (currententity.flags & (Defines.RF_TRANSLUCENT | Defines.RF_WEAPONMODEL)) == 0) {
            gl.glPushMatrix();
            R_RotateForEntity(e);
            gl.glDisable(GL.GL_TEXTURE_2D);
            gl.glEnable(GL.GL_BLEND);
            gl.glColor4f(0, 0, 0, 0.5f);
            GL_DrawAliasShadow(paliashdr, currententity.frame);
            gl.glEnable(GL.GL_TEXTURE_2D);
            gl.glDisable(GL.GL_BLEND);
            gl.glPopMatrix();
        }
        gl.glColor4f(1, 1, 1, 1);
    }

}