gls_render_effect.h

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/*! \file
  \brief  The disti::GlsRenderEffect class.

  \par Copyright Information

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*/
#ifndef _GLS_RENDER_EFFECT_H
#define _GLS_RENDER_EFFECT_H

#include "display_types.h"
#include "dynamic_array.h"
#include "material.h"

#include "gls_version.h"

#ifdef GLES
#    include "gls_state_manager.h"
#endif

//////////////////// Provides support for creating DLLs ////////////////////////
#if( defined( GLSGEN_EXPORT_GLSADVANCEDMESH ) || defined( GLSGEN_IMPORT_GLSADVANCEDMESH ) || defined( GLS_EXPORT_GENERATED ) || defined( GLS_IMPORT_GENERATED ) ) \
    && defined( _MSC_VER )
#    if defined( GLSGEN_EXPORT_GLSADVANCEDMESH ) || defined( GLS_EXPORT_GENERATED )
#        define GLSGEN_GlsAdvancedMesh_EXPORT __declspec( dllexport )
#    else
#        define GLSGEN_GlsAdvancedMesh_EXPORT __declspec( dllimport )
#    endif
#else
#    define GLSGEN_GlsAdvancedMesh_EXPORT
#endif
///////////////////////////////////////////////////////////////////////////////

namespace disti
{
// Forward declarations
class DisplayObject;
class TexturePalette;
class DistiAttribDict;

typedef DynamicArray<int> ReferencedTextureArray;
typedef DynamicArray<int> ReferencedMaterialArray;

// Abstract interface that is needed to tell
// the GlsGeometryResource which vertex attrib
// indices to use for a given rendering pass.
// (e.g. the attribute index to use can vary depending on
// the shader used).
class VertexAttribIndexLookup
{
public:
    virtual ~VertexAttribIndexLookup() {}

    // These are the predefined semantic values from the Cg language
    // Users should be able to define their own in the future, but these will be it for now.
    typedef enum
    {
        ATTRIB_UNDEFINED = 0,
        ATTRIB_POSITION  = 0x80000000,
        ATTRIB_NORMAL,
        ATTRIB_BLENDWEIGHT,
        ATTRIB_TANGENT,
        ATTRIB_BINORMAL,
        ATTRIB_BLENDINDICES,
        ATTRIB_PSIZE,
        ATTRIB_TEXCOORD0,
        ATTRIB_TEXCOORD1,
        ATTRIB_TEXCOORD2,
        ATTRIB_TEXCOORD3,
        ATTRIB_TEXCOORD4,
        ATTRIB_TEXCOORD5,
        ATTRIB_TEXCOORD6,
        ATTRIB_TEXCOORD7
    } AttributeSemanticEnum;

    /// \returns The attributeIndex that should be used to pass the vertex attributes or -1 if they are not needed (see glVertexAttrib)
    /// \param semanticEnum The sematic value (see AttributeSemanticEnum)
    virtual GLint GetVertexAttribIndexForSemantic( int semanticEnum ) = 0;
};

/** Abstract render effect class
  * Encapsulates an effect that can be applied to the OpenGL state to modify the appearance of geometry.
  * This API currently only supports single pass techniques.
  */
class GlsRenderEffect : public VertexAttribIndexLookup
{
protected:
    virtual ~GlsRenderEffect() {}

public:
    /** Manage references to the effect
     */
    virtual void AddRef()  = 0;
    virtual void Release() = 0;

    // Allows for static casting in compare functions
    // See RegisterNewClassID
    virtual unsigned int GlsRenderEffect_ClassID() const = 0;

    /** The TextureSettings class is used to provide the object-level
      * texturing settings to the effect
      */
    class TextureSettings
    {
    public:
        unsigned char _textureRepeat;    /**< GL_TEXTURE_WRAP_* setting (0 or 1) */
        unsigned char _textureMap;       /**< The texturing map mode setting /sa TextureMap_e */
        unsigned char _textureMagFilter; /**< The texturing magnification filter setting /sa TextureFilter_e */
        unsigned char _textureMinFilter; /**< The texturing minification filter setting /sa TextureFilter_e */

        // Initialize the TextureSettings object with the given values
        inline TextureSettings(
            unsigned char textureRepeat    = 1,
            unsigned char textureMap       = TEXTURE_MAP_REPLACE,
            unsigned char textureMagFilter = TEXTURE_FILTER_LINEAR,
            unsigned char textureMinFilter = TEXTURE_FILTER_LINEAR )
            : _textureRepeat( textureRepeat )
            , _textureMap( textureMap )
            , _textureMagFilter( textureMagFilter )
            , _textureMinFilter( textureMinFilter )
        {}
    };

    /// Apply the effect to the OpenGL state
    /// \param materialPalette  Used to access material settings
    /// \param texturePalette  Used to access texture maps
    /// \param textureSettings  The object-level texture settings
    /// \param viewToWorld3x3  A 3x3 matrix containing the current viewToWorld transfrom.  Used for environment mapping effects.
    /// \param maxLightNum The number of active lights in the scene. Used to speed up light calculations.
    /// \param activeLightMask A bit mask of which lights are active in the scene (Ex. GL_LIGHT0, GL_LIGHT2, GL_LIGHT3 and GL_LIGHT7 are active:
    ///        activeLightMask = ...10001101 last 8 bits in binary = 141u)
    virtual void SetupEffect(
        DynamicArray<Material>& materialPalette,
        TexturePalette*         texturePalette,
        const TextureSettings&  textureSettings,
        float*                  viewToWorld3x3, // 3x3 matrix (float[9])
        unsigned int            maxLightNum,
        unsigned int            activeLightMask )
        = 0;

#if !defined( GLES ) || defined( GLES20 )
    /// Remove the effect trom the OpenGL state
    virtual void CleanupEffect() = 0;
#endif

    /** Returns 0 if the effects are equal,
      * a positive number if this effect should sort after the other effect,
      * and a negative number if this effect should sort before the other effect.
      * The rendering system uses this to sort effects.
      */
    virtual int Compare( const GlsRenderEffect* other ) const = 0;

    /** Determine if two GlsRenderEffect instances are equivalent
      * The rendering system uses this to eliminate redundant effects.
      */
    inline bool Equals( const GlsRenderEffect* other ) const { return Compare( other ) == 0; }

    virtual DistiAttribDict& Attributes() = 0;

    virtual const std::string& EffectTypeName() = 0;

    // TODO: Need an API to get / set effect instance parameters without knowing it's type
    // There may be two classes of parameters:
    //  Initialization parameters: (e.g. Reference to a shader program or CG effect file to load)
    //  'Runtime' parameters: The vertex attributes, maps, etc. that are an input to the effect.

    /** Returns a new instance of the effect with the same settings as this one */
    virtual GlsRenderEffect* Clone() const = 0;

    /** Checks whether or not the effect is transparent.  Implementing is optional */
    //virtual bool HasTransparency() const {return false;}

    /** Inserts all referenced textures into the array passed in.  Implementing is optional */
    virtual void GetReferencedMaterials( ReferencedMaterialArray& referencedMaterials ){};

    /** Inserts all referenced textures into the array passed in.  Implementing is optional */
    virtual void GetReferencedTextures( ReferencedTextureArray& referencedTextures ){};

    // Enable / Disable a debug mode for all effects that support it
    // \param modeName name of the mode to enable / disable
    // \param value true to enable the mode, false to disable
    // \returns the number of effect callbacks that recognized the mode change
    static GLSGEN_GlsAdvancedMesh_EXPORT unsigned int SetDebugMode( const char* modeName, bool value );

    // Returns a new ClassID
    // Typically only called once by each GlsRenderEffect implementation
    static GLSGEN_GlsAdvancedMesh_EXPORT unsigned int RegisterNewClassID( const char* debugStr = NULL );

    // typedef for DebugMode change callbacks
    // \see RegisterDebugModeChangeCallback
    // \param user pointer that was provided when the callback was registered
    // \param modeName name of the mode that is changing
    // \param value true to enable the mode, false to disable
    // \param returns true if the callback recognized the mode change, false otherwise
    typedef bool ( *DebugModeChangeCallback )( void* user, const char* modeName, bool value );

    // Register for debug mode change notifications
    // Note: Be sure to also Unregister!
    // \see UnregisterDebugModeChangeCallback
    // \param param user pointer that will be passed to the callback
    // \param func pointer to the callback function
    // \returns true on success
    static GLSGEN_GlsAdvancedMesh_EXPORT bool RegisterDebugModeChangeCallback( void* param, DebugModeChangeCallback func );

    // Unregister for debug mode change notifications
    // The parameters must match those that were passed when the callback was registered
    // \see RegisterDebugModeChangeCallback
    // \param param user pointer that was passed to RegisterDebugModeChangeCallback
    // \param func function pointer that was passed to RegisterDebugModeChangeCallback
    // \returns true if the callback was found and unregistered
    static GLSGEN_GlsAdvancedMesh_EXPORT bool UnregisterDebugModeChangeCallback( void* param, DebugModeChangeCallback func );
};

} // namespace disti

#endif