source: GTP/trunk/App/Demos/Geom/OgreStuff/include/OgrePass.h @ 1812

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[1812]1/*
2-----------------------------------------------------------------------------
3This source file is part of OGRE
4(Object-oriented Graphics Rendering Engine)
5For the latest info, see http://ogre.sourceforge.net/
6
7Copyright (c) 2000-2005 The OGRE Team
8Also see acknowledgements in Readme.html
9
10This program is free software; you can redistribute it and/or modify it under
11the terms of the GNU Lesser General Public License as published by the Free Software
12Foundation; either version 2 of the License, or (at your option) any later
13version.
14
15This program is distributed in the hope that it will be useful, but WITHOUT
16ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
18
19You should have received a copy of the GNU Lesser General Public License along with
20this program; if not, write to the Free Software Foundation, Inc., 59 Temple
21Place - Suite 330, Boston, MA 02111-1307, USA, or go to
22http://www.gnu.org/copyleft/lesser.txt.
23-----------------------------------------------------------------------------
24*/
25#ifndef __Pass_H__
26#define __Pass_H__
27
28#include "OgrePrerequisites.h"
29#include "OgreGpuProgram.h"
30#include "OgreColourValue.h"
31#include "OgreBlendMode.h"
32#include "OgreCommon.h"
33#include "OgreLight.h"
34
35namespace Ogre {
36    /** Class defining a single pass of a Technique (of a Material), ie
37        a single rendering call.
38    @remarks
39        Rendering can be repeated with many passes for more complex effects.
40        Each pass is either a fixed-function pass (meaning it does not use
41        a vertex or fragment program) or a programmable pass (meaning it does
42        use either a vertex and fragment program, or both).
43    @par
44        Programmable passes are complex to define, because they require custom
45        programs and you have to set all constant inputs to the programs (like
46        the position of lights, any base material colours you wish to use etc), but
47        they do give you much total flexibility over the algorithms used to render your
48        pass, and you can create some effects which are impossible with a fixed-function pass.
49        On the other hand, you can define a fixed-function pass in very little time, and
50        you can use a range of fixed-function effects like environment mapping very
51        easily, plus your pass will be more likely to be compatible with older hardware.
52        There are pros and cons to both, just remember that if you use a programmable
53        pass to create some great effects, allow more time for definition and testing.
54    */
55    class _OgreExport Pass
56    {
57    protected:
58        Technique* mParent;
59        unsigned short mIndex; // pass index
60        String mName; // optional name for the pass
61        uint32 mHash; // pass hash
62        //-------------------------------------------------------------------------
63        // Colour properties, only applicable in fixed-function passes
64        ColourValue mAmbient;
65        ColourValue mDiffuse;
66        ColourValue mSpecular;   
67        ColourValue mEmissive;
68        Real mShininess;
69        TrackVertexColourType mTracking;
70        //-------------------------------------------------------------------------
71
72        //-------------------------------------------------------------------------
73        // Blending factors
74        SceneBlendFactor mSourceBlendFactor;   
75        SceneBlendFactor mDestBlendFactor;
76        //-------------------------------------------------------------------------
77
78        //-------------------------------------------------------------------------   
79        // Depth buffer settings
80        bool mDepthCheck;
81        bool mDepthWrite;
82        CompareFunction mDepthFunc;
83        ushort mDepthBias;
84
85        // Colour buffer settings
86        bool mColourWrite;
87               
88                // Alpha reject settings
89                CompareFunction mAlphaRejectFunc;
90                unsigned char mAlphaRejectVal;
91        //-------------------------------------------------------------------------   
92
93        //-------------------------------------------------------------------------
94        // Culling mode
95        CullingMode mCullMode;
96        ManualCullingMode mManualCullMode;
97        //-------------------------------------------------------------------------
98
99        /// Lighting enabled?
100        bool mLightingEnabled;
101        /// Max simultaneous lights
102        unsigned short mMaxSimultaneousLights;
103                /// Run this pass once per light?
104                bool mIteratePerLight;
105        // Should it only be run for a certain light type?
106        bool mRunOnlyForOneLightType;
107        Light::LightTypes mOnlyLightType;
108
109        /// Shading options
110        ShadeOptions mShadeOptions;
111                /// Polygon mode
112                PolygonMode mPolygonMode;
113
114        //-------------------------------------------------------------------------   
115        // Fog
116        bool mFogOverride;
117        FogMode mFogMode;
118        ColourValue mFogColour;
119        Real mFogStart;
120        Real mFogEnd;
121        Real mFogDensity;
122        //-------------------------------------------------------------------------   
123
124        /// Storage of texture unit states
125        typedef std::vector<TextureUnitState*> TextureUnitStates;
126        TextureUnitStates mTextureUnitStates;   
127
128                // Vertex program details
129                GpuProgramUsage *mVertexProgramUsage;
130        // Vertex program details
131        GpuProgramUsage *mShadowCasterVertexProgramUsage;
132        // Vertex program details
133        GpuProgramUsage *mShadowReceiverVertexProgramUsage;
134                // Fragment program details
135                GpuProgramUsage *mFragmentProgramUsage;
136                // Fragment program details
137                GpuProgramUsage *mShadowReceiverFragmentProgramUsage;
138        // Is this pass queued for deletion?
139        bool mQueuedForDeletion;
140        // number of pass iterations to perform
141        size_t mPassIterationCount;
142                // point size, applies when not using per-vertex point size
143                Real mPointSize;
144                Real mPointMinSize;
145                Real mPointMaxSize;
146                bool mPointSpritesEnabled;
147                bool mPointAttenuationEnabled;
148                // constant, linear, quadratic coeffs
149                Real mPointAttenuationCoeffs[3];
150        public:
151                typedef std::set<Pass*> PassSet;
152    protected:
153                /// List of Passes whose hashes need recalculating
154                static PassSet msDirtyHashList;
155        /// The place where passes go to die
156        static PassSet msPassGraveyard;
157    public:
158        /// Default constructor
159                Pass(Technique* parent, unsigned short index);
160        /// Copy constructor
161        Pass(Technique* parent, unsigned short index, const Pass& oth );
162        /// Operator = overload
163        Pass& operator=(const Pass& oth);
164        ~Pass();
165
166        /// Returns true if this pass is programmable ie includes either a vertex or fragment program.
167        bool isProgrammable(void) const { return mVertexProgramUsage || mFragmentProgramUsage; }
168        /// Returns true if this pass uses a programmable vertex pipeline
169        bool hasVertexProgram(void) const { return mVertexProgramUsage != NULL; }
170        /// Returns true if this pass uses a programmable fragment pipeline
171        bool hasFragmentProgram(void) const { return mFragmentProgramUsage != NULL; }
172        /// Returns true if this pass uses a shadow caster vertex program
173        bool hasShadowCasterVertexProgram(void) const { return mShadowCasterVertexProgramUsage != NULL; }
174        /// Returns true if this pass uses a shadow receiver vertex program
175        bool hasShadowReceiverVertexProgram(void) const { return mShadowReceiverVertexProgramUsage != NULL; }
176        /// Returns true if this pass uses a shadow receiver fragment program
177        bool hasShadowReceiverFragmentProgram(void) const { return mShadowReceiverFragmentProgramUsage != NULL; }
178
179
180        /// Gets the index of this Pass in the parent Technique
181        unsigned short getIndex(void) const { return mIndex; }
182        /* Set the name of the pass
183        @remarks
184        The name of the pass is optional.  Its usefull in material scripts where a material could inherit
185        from another material and only want to modify a particalar pass.
186        */
187        void setName(const String& name);
188        /// get the name of the pass
189        const String& getName(void) const { return mName; }
190
191        /** Sets the ambient colour reflectance properties of this pass.
192        @remarks
193        The base colour of a pass is determined by how much red, green and blue light is reflects
194        (provided texture layer #0 has a blend mode other than LBO_REPLACE). This property determines how
195        much ambient light (directionless global light) is reflected. The default is full white, meaning
196        objects are completely globally illuminated. Reduce this if you want to see diffuse or specular light
197        effects, or change the blend of colours to make the object have a base colour other than white.
198        @note
199        This setting has no effect if dynamic lighting is disabled (see Pass::setLightingEnabled),
200        or if this is a programmable pass.
201        */
202        void setAmbient(Real red, Real green, Real blue);
203
204        /** Sets the ambient colour reflectance properties of this pass.
205        @remarks
206        The base colour of a pass is determined by how much red, green and blue light is reflects
207        (provided texture layer #0 has a blend mode other than LBO_REPLACE). This property determines how
208        much ambient light (directionless global light) is reflected. The default is full white, meaning
209        objects are completely globally illuminated. Reduce this if you want to see diffuse or specular light
210        effects, or change the blend of colours to make the object have a base colour other than white.
211        @note
212        This setting has no effect if dynamic lighting is disabled (see Pass::setLightingEnabled),
213        or if this is a programmable pass.
214        */
215
216        void setAmbient(const ColourValue& ambient);
217
218        /** Sets the diffuse colour reflectance properties of this pass.
219        @remarks
220        The base colour of a pass is determined by how much red, green and blue light is reflects
221        (provided texture layer #0 has a blend mode other than LBO_REPLACE). This property determines how
222        much diffuse light (light from instances of the Light class in the scene) is reflected. The default
223        is full white, meaning objects reflect the maximum white light they can from Light objects.
224        @note
225        This setting has no effect if dynamic lighting is disabled (see Pass::setLightingEnabled),
226        or if this is a programmable pass.
227        */
228        void setDiffuse(Real red, Real green, Real blue, Real alpha);
229
230        /** Sets the diffuse colour reflectance properties of this pass.
231        @remarks
232        The base colour of a pass is determined by how much red, green and blue light is reflects
233        (provided texture layer #0 has a blend mode other than LBO_REPLACE). This property determines how
234        much diffuse light (light from instances of the Light class in the scene) is reflected. The default
235        is full white, meaning objects reflect the maximum white light they can from Light objects.
236        @note
237        This setting has no effect if dynamic lighting is disabled (see Pass::setLightingEnabled),
238        or if this is a programmable pass.
239        */
240        void setDiffuse(const ColourValue& diffuse);
241
242        /** Sets the specular colour reflectance properties of this pass.
243        @remarks
244        The base colour of a pass is determined by how much red, green and blue light is reflects
245        (provided texture layer #0 has a blend mode other than LBO_REPLACE). This property determines how
246        much specular light (highlights from instances of the Light class in the scene) is reflected.
247        The default is to reflect no specular light.
248        @note
249        The size of the specular highlights is determined by the separate 'shininess' property.
250        @note
251        This setting has no effect if dynamic lighting is disabled (see Pass::setLightingEnabled),
252        or if this is a programmable pass.
253        */
254        void setSpecular(Real red, Real green, Real blue, Real alpha);
255
256        /** Sets the specular colour reflectance properties of this pass.
257        @remarks
258        The base colour of a pass is determined by how much red, green and blue light is reflects
259        (provided texture layer #0 has a blend mode other than LBO_REPLACE). This property determines how
260        much specular light (highlights from instances of the Light class in the scene) is reflected.
261        The default is to reflect no specular light.
262        @note
263        The size of the specular highlights is determined by the separate 'shininess' property.
264        @note
265        This setting has no effect if dynamic lighting is disabled (see Pass::setLightingEnabled),
266        or if this is a programmable pass.
267        */
268        void setSpecular(const ColourValue& specular);
269
270        /** Sets the shininess of the pass, affecting the size of specular highlights.
271        @note
272        This setting has no effect if dynamic lighting is disabled (see Pass::setLightingEnabled),
273        or if this is a programmable pass.
274        */
275        void setShininess(Real val);
276
277        /** Sets the amount of self-illumination an object has.
278        @remarks
279        If an object is self-illuminating, it does not need external sources to light it, ambient or
280        otherwise. It's like the object has it's own personal ambient light. This property is rarely useful since
281        you can already specify per-pass ambient light, but is here for completeness.
282        @note
283        This setting has no effect if dynamic lighting is disabled (see Pass::setLightingEnabled),
284        or if this is a programmable pass.
285        */
286        void setSelfIllumination(Real red, Real green, Real blue);
287
288        /** Sets the amount of self-illumination an object has.
289        @remarks
290        If an object is self-illuminating, it does not need external sources to light it, ambient or
291        otherwise. It's like the object has it's own personal ambient light. This property is rarely useful since
292        you can already specify per-pass ambient light, but is here for completeness.
293        @note
294        This setting has no effect if dynamic lighting is disabled (see Pass::setLightingEnabled),
295        or if this is a programmable pass.
296        */
297        void setSelfIllumination(const ColourValue& selfIllum);
298
299        /** Sets which material properties follow the vertex colour
300         */
301        void setVertexColourTracking(TrackVertexColourType tracking);
302
303        /** Gets the point size of the pass.
304                @remarks
305                        This property determines what point size is used to render a point
306                        list.
307        */
308        Real getPointSize(void) const;
309
310                /** Sets the point size of this pass.
311                @remarks
312                        This setting allows you to change the size of points when rendering
313                        a point list, or a list of point sprites. The interpretation of this
314                        command depends on the Pass::setPointSizeAttenuation option - if it
315                        is off (the default), the point size is in screen pixels, if it is on,
316                        it expressed as normalised screen coordinates (1.0 is the height of
317                        the screen) when the point is at the origin.
318                @note
319                        Some drivers have an upper limit on the size of points they support
320                        - this can even vary between APIs on the same card! Don't rely on
321                        point sizes that cause the point sprites to get very large on screen,
322                        since they may get clamped on some cards. Upper sizes can range from
323                        64 to 256 pixels.
324                */
325                void setPointSize(Real ps);
326               
327                /** Sets whether or not rendering points using OT_POINT_LIST will
328                        render point sprites (textured quads) or plain points (dots).
329                @param enabled True enables point sprites, false returns to normal
330                        point rendering.
331                */     
332                void setPointSpritesEnabled(bool enabled);
333
334                /** Returns whether point sprites are enabled when rendering a
335                        point list.
336                */
337                bool getPointSpritesEnabled(void) const;
338
339                /** Sets how points are attenuated with distance.
340                @remarks
341                        When performing point rendering or point sprite rendering,
342                        point size can be attenuated with distance. The equation for
343                        doing this is attenuation = 1 / (constant + linear * dist + quadratic * d^2).
344                @par
345                        For example, to disable distance attenuation (constant screensize)
346                        you would set constant to 1, and linear and quadratic to 0. A
347                        standard perspective attenuation would be 0, 1, 0 respectively.
348                @note
349                        The resulting size is clamped to the minimum and maximum point
350                        size.
351                @param enabled Whether point attenuation is enabled
352                @param constant, linear, quadratic Parameters to the attentuation
353                        function defined above
354                */
355                void setPointAttenuation(bool enabled,
356                        Real constant = 0.0f, Real linear = 1.0f, Real quadratic = 0.0f);
357
358                /** Returns whether points are attenuated with distance. */
359                bool isPointAttenuationEnabled(void) const;
360
361                /** Returns the constant coefficient of point attenuation. */
362                Real getPointAttenuationConstant(void) const;
363                /** Returns the linear coefficient of point attenuation. */
364                Real getPointAttenuationLinear(void) const;
365                /** Returns the quadratic coefficient of point attenuation. */
366                Real getPointAttenuationQuadratic(void) const;
367
368                /** Set the minimum point size, when point attenuation is in use. */
369                void setPointMinSize(Real min);
370                /** Get the minimum point size, when point attenuation is in use. */
371                Real getPointMinSize(void) const;
372                /** Set the maximum point size, when point attenuation is in use.
373                @remarks Setting this to 0 indicates the max size supported by the card.
374                */
375                void setPointMaxSize(Real max);
376                /** Get the maximum point size, when point attenuation is in use.
377                @remarks 0 indicates the max size supported by the card.
378                */
379                Real getPointMaxSize(void) const;
380
381                /** Gets the ambient colour reflectance of the pass.
382        */
383        const ColourValue& getAmbient(void) const;
384
385        /** Gets the diffuse colour reflectance of the pass.
386        */
387        const ColourValue& getDiffuse(void) const;
388
389        /** Gets the specular colour reflectance of the pass.
390        */
391        const ColourValue& getSpecular(void) const;
392
393        /** Gets the self illumination colour of the pass.
394        */
395        const ColourValue& getSelfIllumination(void) const;
396
397        /** Gets the 'shininess' property of the pass (affects specular highlights).
398        */
399        Real getShininess(void) const;
400       
401        /** Gets which material properties follow the vertex colour
402         */
403        TrackVertexColourType getVertexColourTracking(void) const;
404
405        /** Inserts a new TextureUnitState object into the Pass.
406        @remarks
407        This unit is is added on top of all previous units.
408        */
409        TextureUnitState* createTextureUnitState(void);
410        /** Inserts a new TextureUnitState object into the Pass.
411        @remarks
412        This unit is is added on top of all previous units.
413        @param
414        name The basic name of the texture e.g. brickwall.jpg, stonefloor.png
415        @param
416        texCoordSet The index of the texture coordinate set to use.
417        @note
418        Applies to both fixed-function and programmable passes.
419        */
420        TextureUnitState* createTextureUnitState( const String& textureName, unsigned short texCoordSet = 0);
421                /** Adds the passed in TextureUnitState, to the existing Pass.
422        @param
423        state The Texture Unit State to be attached to this pass.  It must not be attached to another pass.
424        @note
425            Throws an exception if the TextureUnitState is attached to another Pass.*/
426                void addTextureUnitState(TextureUnitState* state);
427        /** Retrieves a pointer to a texture unit state so it may be modified.
428        */
429        TextureUnitState* getTextureUnitState(unsigned short index);
430        /** Retrieves the Texture Unit State matching name.
431            Returns 0 if name match is not found.
432        */
433        TextureUnitState* getTextureUnitState(const String& name);
434                /** Retrieves a const pointer to a texture unit state.
435                */
436                const TextureUnitState* getTextureUnitState(unsigned short index) const;
437                /** Retrieves the Texture Unit State matching name.
438                Returns 0 if name match is not found.
439                */
440                const TextureUnitState* getTextureUnitState(const String& name) const;
441
442        /**  Retrieve the index of the Texture Unit State in the pass.
443        @param
444        state The Texture Unit State this is attached to this pass.
445        @note
446            Throws an exception if the state is not attached to the pass.
447        */
448        unsigned short getTextureUnitStateIndex(const TextureUnitState* state);
449
450        typedef VectorIterator<TextureUnitStates> TextureUnitStateIterator;
451        /** Get an iterator over the TextureUnitStates contained in this Pass. */
452        TextureUnitStateIterator getTextureUnitStateIterator(void);
453
454                typedef ConstVectorIterator<TextureUnitStates> ConstTextureUnitStateIterator;
455                /** Get an iterator over the TextureUnitStates contained in this Pass. */
456                ConstTextureUnitStateIterator getTextureUnitStateIterator(void) const;
457
458                /** Removes the indexed texture unit state from this pass.
459        @remarks
460            Note that removing a texture which is not the topmost will have a larger performance impact.
461        */
462        void removeTextureUnitState(unsigned short index);
463
464        /** Removes all texture unit settings.
465        */
466        void removeAllTextureUnitStates(void);
467
468        /** Returns the number of texture unit settings.
469        */
470        size_t getNumTextureUnitStates(void) const
471        {
472            return mTextureUnitStates.size();
473        }
474
475        /** Sets the kind of blending this pass has with the existing contents of the scene.
476        @remarks
477        Wheras the texture blending operations seen in the TextureUnitState class are concerned with
478        blending between texture layers, this blending is about combining the output of the Pass
479        as a whole with the existing contents of the rendering target. This blending therefore allows
480        object transparency and other special effects. If all passes in a technique have a scene
481        blend, then the whole technique is considered to be transparent.
482        @par
483        This method allows you to select one of a number of predefined blending types. If you require more
484        control than this, use the alternative version of this method which allows you to specify source and
485        destination blend factors.
486        @note
487        This method is applicable for both the fixed-function and programmable pipelines.
488        @param
489        sbt One of the predefined SceneBlendType blending types
490        */
491        void setSceneBlending( const SceneBlendType sbt );
492
493        /** Allows very fine control of blending this Pass with the existing contents of the scene.
494        @remarks
495        Wheras the texture blending operations seen in the TextureUnitState class are concerned with
496        blending between texture layers, this blending is about combining the output of the material
497        as a whole with the existing contents of the rendering target. This blending therefore allows
498        object transparency and other special effects.
499        @par
500        This version of the method allows complete control over the blending operation, by specifying the
501        source and destination blending factors. The result of the blending operation is:
502        <span align="center">
503        final = (texture * sourceFactor) + (pixel * destFactor)
504        </span>
505        @par
506        Each of the factors is specified as one of a number of options, as specified in the SceneBlendFactor
507        enumerated type.
508        @param
509        sourceFactor The source factor in the above calculation, i.e. multiplied by the texture colour components.
510        @param
511        destFactor The destination factor in the above calculation, i.e. multiplied by the pixel colour components.
512        @note
513        This method is applicable for both the fixed-function and programmable pipelines.
514        */
515        void setSceneBlending( const SceneBlendFactor sourceFactor, const SceneBlendFactor destFactor);
516
517        /** Retrieves the source blending factor for the material (as set using Materiall::setSceneBlending).
518        */
519        SceneBlendFactor getSourceBlendFactor() const;
520
521        /** Retrieves the destination blending factor for the material (as set using Materiall::setSceneBlending).
522        */
523        SceneBlendFactor getDestBlendFactor() const;
524
525                /** Returns true if this pass has some element of transparency. */
526                bool isTransparent(void) const;
527
528                /** Sets whether or not this pass renders with depth-buffer checking on or not.
529        @remarks
530        If depth-buffer checking is on, whenever a pixel is about to be written to the frame buffer
531        the depth buffer is checked to see if the pixel is in front of all other pixels written at that
532        point. If not, the pixel is not written.
533        @par
534        If depth checking is off, pixels are written no matter what has been rendered before.
535        Also see setDepthFunction for more advanced depth check configuration.
536        @see
537        setDepthFunction
538        */
539        void setDepthCheckEnabled(bool enabled);
540
541        /** Returns whether or not this pass renders with depth-buffer checking on or not.
542        @see
543        setDepthCheckEnabled
544        */
545        bool getDepthCheckEnabled(void) const;
546
547        /** Sets whether or not this pass renders with depth-buffer writing on or not.
548        @remarks
549        If depth-buffer writing is on, whenever a pixel is written to the frame buffer
550        the depth buffer is updated with the depth value of that new pixel, thus affecting future
551        rendering operations if future pixels are behind this one.
552        @par
553        If depth writing is off, pixels are written without updating the depth buffer Depth writing should
554        normally be on but can be turned off when rendering static backgrounds or when rendering a collection
555        of transparent objects at the end of a scene so that they overlap each other correctly.
556        */
557        void setDepthWriteEnabled(bool enabled);
558
559        /** Returns whether or not this pass renders with depth-buffer writing on or not.
560        @see
561        setDepthWriteEnabled
562        */
563        bool getDepthWriteEnabled(void) const;
564
565        /** Sets the function used to compare depth values when depth checking is on.
566        @remarks
567        If depth checking is enabled (see setDepthCheckEnabled) a comparison occurs between the depth
568        value of the pixel to be written and the current contents of the buffer. This comparison is
569        normally CMPF_LESS_EQUAL, i.e. the pixel is written if it is closer (or at the same distance)
570        than the current contents. If you wish you can change this comparison using this method.
571        */
572        void setDepthFunction( CompareFunction func );
573        /** Returns the function used to compare depth values when depth checking is on.
574        @see
575        setDepthFunction
576        */
577        CompareFunction getDepthFunction(void) const;
578
579                /** Sets whether or not colour buffer writing is enabled for this Pass.
580                @remarks
581                        For some effects, you might wish to turn off the colour write operation
582                        when rendering geometry; this means that only the depth buffer will be
583                        updated (provided you have depth buffer writing enabled, which you
584                        probably will do, although you may wish to only update the stencil
585                        buffer for example - stencil buffer state is managed at the RenderSystem
586                        level only, not the Material since you are likely to want to manage it
587                        at a higher level).
588                */
589                void setColourWriteEnabled(bool enabled);
590                /** Determines if colour buffer writing is enabled for this pass. */
591                bool getColourWriteEnabled(void) const;
592
593        /** Sets the culling mode for this pass  based on the 'vertex winding'.
594        @remarks
595        A typical way for the rendering engine to cull triangles is based on the 'vertex winding' of
596        triangles. Vertex winding refers to the direction in which the vertices are passed or indexed
597        to in the rendering operation as viewed from the camera, and will wither be clockwise or
598        anticlockwise (that's 'counterclockwise' for you Americans out there ;) The default is
599        CULL_CLOCKWISE i.e. that only triangles whose vertices are passed/indexed in anticlockwise order
600        are rendered - this is a common approach and is used in 3D studio models for example. You can
601        alter this culling mode if you wish but it is not advised unless you know what you are doing.
602        @par
603        You may wish to use the CULL_NONE option for mesh data that you cull yourself where the vertex
604        winding is uncertain.
605        */
606        void setCullingMode( CullingMode mode );
607
608        /** Returns the culling mode for geometry rendered with this pass. See setCullingMode for more information.
609        */
610        CullingMode getCullingMode(void) const;
611
612        /** Sets the manual culling mode, performed by CPU rather than hardware.
613        @pemarks
614        In some situations you want to use manual culling of triangles rather than sending the
615        triangles to the hardware and letting it cull them. This setting only takes effect on SceneManager's
616        that use it (since it is best used on large groups of planar world geometry rather than on movable
617        geometry since this would be expensive), but if used can cull geometry before it is sent to the
618        hardware.
619        @note
620        The default for this setting is MANUAL_CULL_BACK.
621        @param
622        mode The mode to use - see enum ManualCullingMode for details
623
624        */
625        void setManualCullingMode( ManualCullingMode mode );
626
627        /** Retrieves the manual culling mode for this pass
628        @see
629        setManualCullingMode
630        */
631        ManualCullingMode getManualCullingMode(void) const;
632
633        /** Sets whether or not dynamic lighting is enabled.
634        @param
635        enabled
636        If true, dynamic lighting is performed on geometry with normals supplied, geometry without
637        normals will not be displayed.
638        @par
639        If false, no lighting is applied and all geometry will be full brightness.
640        */
641        void setLightingEnabled(bool enabled);
642
643        /** Returns whether or not dynamic lighting is enabled.
644        */
645        bool getLightingEnabled(void) const;
646
647        /** Sets the maximum number of lights to be used by this pass.
648        @remarks
649            During rendering, if lighting is enabled (or if the pass uses an automatic
650            program parameter based on a light) the engine will request the nearest lights
651            to the object being rendered in order to work out which ones to use. This
652            parameter sets the limit on the number of lights which should apply to objects
653            rendered with this pass.
654        */
655        void setMaxSimultaneousLights(unsigned short maxLights);
656        /** Gets the maximum number of lights to be used by this pass. */
657        unsigned short getMaxSimultaneousLights(void) const;
658
659        /** Sets the type of light shading required
660        @note
661        The default shading method is Gouraud shading.
662        */
663        void setShadingMode( ShadeOptions mode );
664
665        /** Returns the type of light shading to be used.
666        */
667        ShadeOptions getShadingMode(void) const;
668
669                /** Sets the type of polygon rendering required
670                @note
671                The default shading method is Solid
672                */
673                void setPolygonMode( PolygonMode mode );
674
675                /** Returns the type of light shading to be used.
676                */
677                PolygonMode getPolygonMode(void) const;
678
679        /** Sets the fogging mode applied to this pass.
680        @remarks
681        Fogging is an effect that is applied as polys are rendered. Sometimes, you want
682        fog to be applied to an entire scene. Other times, you want it to be applied to a few
683        polygons only. This pass-level specification of fog parameters lets you easily manage
684        both.
685        @par
686        The SceneManager class also has a setFog method which applies scene-level fog. This method
687        lets you change the fog behaviour for this pass compared to the standard scene-level fog.
688        @param
689        overrideScene If true, you authorise this pass to override the scene's fog params with it's own settings.
690        If you specify false, so other parameters are necessary, and this is the default behaviour for passs.
691        @param
692        mode Only applicable if overrideScene is true. You can disable fog which is turned on for the
693        rest of the scene by specifying FOG_NONE. Otherwise, set a pass-specific fog mode as
694        defined in the enum FogMode.
695        @param
696        colour The colour of the fog. Either set this to the same as your viewport background colour,
697        or to blend in with a skydome or skybox.
698        @param
699        expDensity The density of the fog in FOG_EXP or FOG_EXP2 mode, as a value between 0 and 1.
700        The default is 0.001.
701        @param
702        linearStart Distance in world units at which linear fog starts to encroach.
703        Only applicable if mode is FOG_LINEAR.
704        @param
705        linearEnd Distance in world units at which linear fog becomes completely opaque.
706        Only applicable if mode is FOG_LINEAR.
707        */
708        void setFog(
709            bool overrideScene,
710            FogMode mode = FOG_NONE,
711            const ColourValue& colour = ColourValue::White,
712            Real expDensity = 0.001, Real linearStart = 0.0, Real linearEnd = 1.0 );
713
714        /** Returns true if this pass is to override the scene fog settings.
715        */
716        bool getFogOverride(void) const;
717
718        /** Returns the fog mode for this pass.
719        @note
720        Only valid if getFogOverride is true.
721        */
722        FogMode getFogMode(void) const;
723
724        /** Returns the fog colour for the scene.
725        */
726        const ColourValue& getFogColour(void) const;
727
728        /** Returns the fog start distance for this pass.
729        @note
730        Only valid if getFogOverride is true.
731        */
732        Real getFogStart(void) const;
733
734        /** Returns the fog end distance for this pass.
735        @note
736        Only valid if getFogOverride is true.
737        */
738        Real getFogEnd(void) const;
739
740        /** Returns the fog density for this pass.
741        @note
742        Only valid if getFogOverride is true.
743        */
744        Real getFogDensity(void) const;
745
746        /** Sets the depth bias to be used for this material.
747        @remarks
748        When polygons are coplanar, you can get problems with 'depth fighting' where
749        the pixels from the two polys compete for the same screen pixel. This is particularly
750        a problem for decals (polys attached to another surface to represent details such as
751        bulletholes etc.).
752        @par
753        A way to combat this problem is to use a depth bias to adjust the depth buffer value
754        used for the decal such that it is slightly higher than the true value, ensuring that
755        the decal appears on top.
756        @param bias The bias value, should be between 0 and 16.
757        */
758        void setDepthBias(ushort bias);
759
760        /** Retrieves the depth bias value as set by setDepthValue. */
761        ushort getDepthBias(void) const;
762
763        /** Sets the way the pass will have use alpha to totally reject pixels from the pipeline.
764        @remarks
765                        The default is CMPF_ALWAYS_PASS i.e. alpha is not used to reject pixels.
766        @param func The comparison which must pass for the pixel to be written.
767        @param value 1 byte value against which alpha values will be tested(0-255)
768        @note
769                        This option applies in both the fixed function and the programmable pipeline.
770        */
771        void setAlphaRejectSettings(CompareFunction func, unsigned char value);
772
773                /** Sets the alpha reject function. See setAlphaRejectSettings for more information.
774                */
775                void setAlphaRejectFunction(CompareFunction func);
776
777                /** Gets the alpha reject value. See setAlphaRejectSettings for more information.
778                */
779                void setAlphaRejectValue(unsigned char val);
780
781                /** Gets the alpha reject function. See setAlphaRejectSettings for more information.
782        */
783                CompareFunction getAlphaRejectFunction(void) const { return mAlphaRejectFunc; }
784
785        /** Gets the alpha reject value. See setAlphaRejectSettings for more information.
786        */
787                unsigned char getAlphaRejectValue(void) const { return mAlphaRejectVal; }
788        /** Sets whether or not this pass should iterate per light which
789                    can affect the object being rendered.
790                @remarks
791                        The default behaviour for a pass (when this option is 'false'), is
792                        for a pass to be rendered only once (or the number of times set in
793                        setPassIterationCount), with all the lights which could
794                        affect this object set at the same time (up to the maximum lights
795                        allowed in the render system, which is typically 8).
796                @par
797                        Setting this option to 'true' changes this behaviour, such that
798                        instead of trying to issue render this pass once per object, it
799                        is run <b>per light</b> which can affect this object, the number of
800                        times set in setPassIterationCount (default is once). In
801                        this case, only light index 0 is ever used, and is a different light
802                        every time the pass is issued, up to the total number of lights
803                        which is affecting this object. This has 2 advantages:
804                        <ul><li>There is no limit on the number of lights which can be
805                        supported</li>
806                        <li>It's easier to write vertex / fragment programs for this because
807                        a single program can be used for any number of lights</li>
808                        </ul>
809                        However, this technique is a lot more expensive, and typically you
810                        will want an additional ambient pass, because if no lights are
811                        affecting the object it will not be rendered at all, which will look
812                        odd even if ambient light is zero (imagine if there are lit objects
813                        behind it - the objects silhouette would not show up). Therefore,
814                        use this option with care, and you would be well advised to provide
815                        a less expensive fallback technique for use in the distance.
816                @note
817                        The number of times this pass runs is still limited by the maximum
818                        number of lights allowed as set in setMaxSimultaneousLights, so
819                        you will never get more passes than this.
820        @param enabled Whether this feature is enabled
821        @param onlyForOneLightType If true, the pass will only be run for a single type
822            of light, other light types will be ignored.
823        @param lightType The single light type which will be considered for this pass
824                */
825        void setIteratePerLight(bool enabled,
826            bool onlyForOneLightType = true, Light::LightTypes lightType = Light::LT_POINT);
827
828        /** Does this pass run once for every light in range? */
829                bool getIteratePerLight(void) const { return mIteratePerLight; }
830        /** Does this pass run only for a single light type (if getIteratePerLight is true). */
831        bool getRunOnlyForOneLightType(void) const { return mRunOnlyForOneLightType; }
832        /** Gets the single light type this pass runs for if  getIteratePerLight and
833            getRunOnlyForOneLightType are both true. */
834        Light::LightTypes getOnlyLightType() const { return mOnlyLightType; }
835               
836                /// Gets the parent Technique
837        Technique* getParent(void) { return mParent; }
838
839                /// Gets the resource group of the ultimate parent Material
840                const String& getResourceGroup(void) const;
841
842                /** Sets the details of the vertex program to use.
843                @remarks
844                        Only applicable to programmable passes, this sets the details of
845                        the vertex program to use in this pass. The program will not be
846                        loaded until the parent Material is loaded.
847                @param name The name of the program - this must have been
848                        created using GpuProgramManager by the time that this Pass
849                        is loaded. If this parameter is blank, any vertex program in this pass is disabled.
850        @param resetParams
851            If true, this will create a fresh set of parameters from the
852            new program being linked, so if you had previously set parameters
853            you will have to set them again. If you set this to false, you must
854            be absolutely sure that the parameters match perfectly, and in the
855            case of named parameters refers to the indexes underlying them,
856            not just the names.
857                */
858                void setVertexProgram(const String& name, bool resetParams = true);
859                /** Sets the vertex program parameters.
860                @remarks
861                        Only applicable to programmable passes, and this particular call is
862                        designed for low-level programs; use the named parameter methods
863                        for setting high-level program parameters.
864                */
865                void setVertexProgramParameters(GpuProgramParametersSharedPtr params);
866                /** Gets the name of the vertex program used by this pass. */
867                const String& getVertexProgramName(void) const;
868        /** Gets the vertex program parameters used by this pass. */
869        GpuProgramParametersSharedPtr getVertexProgramParameters(void) const;
870                /** Gets the vertex program used by this pass, only available after _load(). */
871                const GpuProgramPtr& getVertexProgram(void) const;
872
873
874        /** Sets the details of the vertex program to use when rendering as a
875        shadow caster.
876        @remarks
877        Texture-based shadows require that the caster is rendered to a texture
878        in a solid colour (the shadow colour in the case of modulative texture
879        shadows). Whilst Ogre can arrange this for the fixed function
880        pipeline, passes which use vertex programs might need the vertex
881        programs still to run in order to preserve any deformation etc
882        that it does. However, lighting calculations must be a lot simpler,
883        with only the ambient colour being used (which the engine will ensure
884        is bound to the shadow colour).
885        @par
886        Therefore, it is up to implemetors of vertex programs to provide an
887        alternative vertex program which can be used to render the object
888        to a shadow texture. Do all the same vertex transforms, but set the
889        colour of the vertex to the ambient colour, as bound using the
890        standard auto parameter binding mechanism.
891        @note
892        Some vertex programs will work without doing this, because Ogre ensures
893        that all lights except for ambient are set black. However, the chances
894        are that your vertex program is doing a lot of unnecessary work in this
895        case, since the other lights are having no effect, and it is good practice
896        to supply an alternative.
897        @note
898        This is only applicable to programmable passes.
899        @par
900        The default behaviour is for Ogre to switch to fixed-function
901        rendering if an explict vertex program alternative is not set.
902        */
903        void setShadowCasterVertexProgram(const String& name);
904        /** Sets the vertex program parameters for rendering as a shadow caster.
905        @remarks
906        Only applicable to programmable passes, and this particular call is
907        designed for low-level programs; use the named parameter methods
908        for setting high-level program parameters.
909        */
910        void setShadowCasterVertexProgramParameters(GpuProgramParametersSharedPtr params);
911        /** Gets the name of the vertex program used by this pass when rendering shadow casters. */
912        const String& getShadowCasterVertexProgramName(void) const;
913        /** Gets the vertex program parameters used by this pass when rendering shadow casters. */
914        GpuProgramParametersSharedPtr getShadowCasterVertexProgramParameters(void) const;
915        /** Gets the vertex program used by this pass when rendering shadow casters,
916            only available after _load(). */
917        const GpuProgramPtr& getShadowCasterVertexProgram(void) const;
918
919        /** Sets the details of the vertex program to use when rendering as a
920            shadow receiver.
921        @remarks
922            Texture-based shadows require that the shadow receiver is rendered using
923            a projective texture. Whilst Ogre can arrange this for the fixed function
924            pipeline, passes which use vertex programs might need the vertex
925            programs still to run in order to preserve any deformation etc
926            that it does. So in this case, we need a vertex program which does the
927            appropriate vertex transformation, but generates projective texture
928            coordinates.
929        @par
930            Therefore, it is up to implemetors of vertex programs to provide an
931            alternative vertex program which can be used to render the object
932            as a shadow receiver. Do all the same vertex transforms, but generate
933            <strong>2 sets</strong> of texture coordinates using the auto parameter
934            ACT_TEXTURE_VIEWPROJ_MATRIX, which Ogre will bind to the parameter name /
935            index you supply as the second parameter to this method. 2 texture
936            sets are needed because Ogre needs to use 2 texture units for some
937            shadow effects.
938        @note
939            This is only applicable to programmable passes.
940        @par
941            The default behaviour is for Ogre to switch to fixed-function
942            rendering if an explict vertex program alternative is not set.         
943        */
944        void setShadowReceiverVertexProgram(const String& name);
945        /** Sets the vertex program parameters for rendering as a shadow receiver.
946        @remarks
947        Only applicable to programmable passes, and this particular call is
948        designed for low-level programs; use the named parameter methods
949        for setting high-level program parameters.
950        */
951        void setShadowReceiverVertexProgramParameters(GpuProgramParametersSharedPtr params);
952
953                /** This method allows you to specify a fragment program for use when
954                        rendering a texture shadow receiver.
955                @remarks
956                        Texture shadows are applied by rendering the receiver. Modulative texture
957                        shadows are performed as a post-render darkening pass, and as such
958                        fragment programs are generally not required per-object. Additive
959                        texture shadows, however, are applied by accumulating light masked
960                        out using a texture shadow (black & white by default, unless you
961                        customise this using SceneManager::setCustomShadowCasterMaterial).
962                        OGRE can do this for you for most materials, but if you use a custom
963                        lighting program (e.g. per pixel lighting) then you'll need to provide
964                        a custom version for receiving shadows. You don't need to provide
965                        this for shadow casters if you don't use self-shadowing since they
966                        will never be shadow receivers too.
967                @par
968                        The shadow texture is always bound to texture unit 0 when rendering
969                        texture shadow passes. Therefore your custom shadow receiver program
970                        may well just need to shift it's texture unit usage up by one unit,
971                        and take the shadow texture into account in its calculations.
972                */
973                void setShadowReceiverFragmentProgram(const String& name);
974        /** Sets the fragment program parameters for rendering as a shadow receiver.
975        @remarks
976        Only applicable to programmable passes, and this particular call is
977        designed for low-level programs; use the named parameter methods
978        for setting high-level program parameters.
979        */
980        void setShadowReceiverFragmentProgramParameters(GpuProgramParametersSharedPtr params);
981
982        /** Gets the name of the vertex program used by this pass when rendering shadow receivers. */
983        const String& getShadowReceiverVertexProgramName(void) const;
984        /** Gets the vertex program parameters used by this pass when rendering shadow receivers. */
985        GpuProgramParametersSharedPtr getShadowReceiverVertexProgramParameters(void) const;
986        /** Gets the vertex program used by this pass when rendering shadow receivers,
987        only available after _load(). */
988        const GpuProgramPtr& getShadowReceiverVertexProgram(void) const;
989
990                /** Gets the name of the fragment program used by this pass when rendering shadow receivers. */
991                const String& getShadowReceiverFragmentProgramName(void) const;
992                /** Gets the fragment program parameters used by this pass when rendering shadow receivers. */
993                GpuProgramParametersSharedPtr getShadowReceiverFragmentProgramParameters(void) const;
994                /** Gets the fragment program used by this pass when rendering shadow receivers,
995                only available after _load(). */
996                const GpuProgramPtr& getShadowReceiverFragmentProgram(void) const;
997
998                /** Sets the details of the fragment program to use.
999                @remarks
1000                        Only applicable to programmable passes, this sets the details of
1001                        the fragment program to use in this pass. The program will not be
1002                        loaded until the parent Material is loaded.
1003                @param name The name of the program - this must have been
1004                        created using GpuProgramManager by the time that this Pass
1005                        is loaded. If this parameter is blank, any fragment program in this pass is disabled.
1006        @param resetParams
1007            If true, this will create a fresh set of parameters from the
1008            new program being linked, so if you had previously set parameters
1009            you will have to set them again. If you set this to false, you must
1010            be absolutely sure that the parameters match perfectly, and in the
1011            case of named parameters refers to the indexes underlying them,
1012            not just the names.
1013                */
1014                void setFragmentProgram(const String& name, bool resetParams = true);
1015                /** Sets the vertex program parameters.
1016                @remarks
1017                        Only applicable to programmable passes.
1018                */
1019                void setFragmentProgramParameters(GpuProgramParametersSharedPtr params);
1020                /** Gets the name of the fragment program used by this pass. */
1021                const String& getFragmentProgramName(void) const;
1022                /** Gets the vertex program parameters used by this pass. */
1023                GpuProgramParametersSharedPtr getFragmentProgramParameters(void) const;
1024                /** Gets the vertex program used by this pass, only available after _load(). */
1025                const GpuProgramPtr& getFragmentProgram(void) const;
1026
1027                /** Splits this Pass to one which can be handled in the number of
1028                        texture units specified.
1029                @remarks
1030                        Only works on non-programmable passes, programmable passes cannot be
1031                        split, it's up to the author to ensure that there is a fallback Technique
1032                        for less capable cards.
1033                @param numUnits The target number of texture units
1034                @returns A new Pass which contains the remaining units, and a scene_blend
1035                                setting appropriate to approximate the multitexture. This Pass will be
1036                                attached to the parent Technique of this Pass.
1037                */
1038                Pass* _split(unsigned short numUnits);
1039
1040                /** Internal method to adjust pass index. */
1041                void _notifyIndex(unsigned short index);
1042
1043                /** Internal method for loading this pass. */
1044                void _load(void);
1045                /** Internal method for unloading this pass. */
1046                void _unload(void);
1047        // Is this loaded?
1048        bool isLoaded(void) const;
1049
1050        /** Gets the 'hash' of this pass, ie a precomputed number to use for sorting
1051        @remarks
1052            This hash is used to sort passes, and for this reason the pass is hashed
1053            using firstly its index (so that all passes are rendered in order), then
1054            by the textures which it's TextureUnitState instances are using.
1055        */
1056        uint32 getHash(void) const;
1057                /// Mark the hash as dirty
1058                void _dirtyHash(void);
1059        /** Internal method for recalculating the hash.
1060                @remarks
1061                        Do not call this unless you are sure the old hash is not still being
1062                        used by anything. If in doubt, call _dirtyHash if you want to force
1063                        recalculation of the has next time.
1064                */
1065        void _recalculateHash(void);
1066        /** Tells the pass that it needs recompilation. */
1067        void _notifyNeedsRecompile(void);
1068
1069        /** Update any automatic parameters (except lights) on this pass */
1070        void _updateAutoParamsNoLights(const AutoParamDataSource& source) const;
1071        /** Update any automatic light parameters on this pass */
1072        void _updateAutoParamsLightsOnly(const AutoParamDataSource& source) const;
1073
1074        /** Set texture filtering for every texture unit
1075        @note
1076            This property actually exists on the TextureUnitState class
1077            For simplicity, this method allows you to set these properties for
1078            every current TeextureUnitState, If you need more precision, retrieve the 
1079            TextureUnitState instance and set the property there.
1080        @see TextureUnitState::setTextureFiltering
1081        */
1082        void setTextureFiltering(TextureFilterOptions filterType);
1083        /** Sets the anisotropy level to be used for all textures.
1084        @note
1085            This property has been moved to the TextureUnitState class, which is accessible via the
1086            Technique and Pass. For simplicity, this method allows you to set these properties for
1087            every current TeextureUnitState, If you need more precision, retrieve the Technique,
1088            Pass and TextureUnitState instances and set the property there.
1089        @see TextureUnitState::setTextureAnisotropy
1090        */
1091        void setTextureAnisotropy(unsigned int maxAniso);
1092                /** Static method to retrieve all the Passes which need their
1093                    hash values recalculated.
1094                */
1095                static const PassSet& getDirtyHashList(void)
1096                { return msDirtyHashList; }
1097        /** Static method to retrieve all the Passes which are pending deletion.
1098        */
1099        static const PassSet& getPassGraveyard(void)
1100        { return msPassGraveyard; }
1101                /** Static method to reset the list of passes which need their hash
1102                    values recalculated.
1103                @remarks
1104                        For performance, the dirty list is not updated progressively as
1105                        the hashes are recalculated, instead we expect the processor of the
1106                        dirty hash list to clear the list when they are done.
1107                */
1108                static void clearDirtyHashList(void) { msDirtyHashList.clear(); }
1109
1110        /** Process all dirty and pending deletion passes. */
1111        static void processPendingPassUpdates(void);
1112
1113        /** Queue this pass for deletion when appropriate. */
1114        void queueForDeletion(void);
1115
1116        /** Returns whether this pass is ambient only.
1117        */
1118        bool isAmbientOnly(void) const;
1119
1120        /** set the number of iterations that this pass
1121        should perform when doing fast multi pass operation.
1122        @remarks
1123            Only applicable for programmable passes.
1124        @param count number of iterations to perform fast multi pass operations.
1125            A value greater than 0 will cause the pass to be executed count number of
1126            times without changing the render state.  This is very usefull for passes
1127            that use programmable shaders that have to iterate more than once but don't
1128            need a render state change.  Using multi pass can dramatically speed up rendering
1129            for materials that do things like fur, blur.
1130            A value of 0 turns off multi pass operation and the pass does
1131            the normal pass operation.
1132        */
1133        void setPassIterationCount(const size_t count) { mPassIterationCount = count; }
1134
1135        /** Gets the multi pass count value.
1136        */
1137        size_t getPassIterationCount(void) const { return mPassIterationCount; }
1138
1139        /** Applies texture names to Texture Unit State with matching texture name aliases.
1140            All Texture Unit States within the pass are checked.
1141            If matching texture aliases are found then true is returned.
1142
1143        @param
1144            aliasList is a map container of texture alias, texture name pairs
1145        @param
1146            apply set true to apply the texture aliases else just test to see if texture alias matches are found.
1147        @return
1148            True if matching texture aliases were found in the pass.
1149        */
1150        bool applyTextureAliases(const AliasTextureNamePairList& aliasList, const bool apply = true) const;
1151       
1152    };
1153
1154    enum IlluminationStage
1155    {
1156        /// Part of the rendering which occurs without any kind of direct lighting
1157        IS_AMBIENT,
1158        /// Part of the rendering which occurs per light
1159        IS_PER_LIGHT,
1160        /// Post-lighting rendering
1161        IS_DECAL
1162    };
1163    /** Struct recording a pass which can be used for a specific illumination stage.
1164    @remarks
1165        This structure is used to record categorised passes which fit into a
1166        number of distinct illumination phases - ambient, diffuse / specular
1167        (per-light) and decal (post-lighting texturing).
1168        An original pass may fit into one of these categories already, or it
1169        may require splitting into its component parts in order to be categorised
1170        properly.
1171    */
1172    struct IlluminationPass
1173    {
1174        IlluminationStage stage;
1175        /// The pass to use in this stage
1176        Pass* pass;
1177        /// Whether this pass is one which should be deleted itself
1178        bool destroyOnShutdown;
1179        /// The original pass which spawned this one
1180        Pass* originalPass;
1181    };
1182
1183    typedef std::vector<IlluminationPass*> IlluminationPassList;
1184
1185
1186}
1187
1188#endif
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