sl@0: /*
sl@0: * Copyright (c) 2003 Nokia Corporation and/or its subsidiary(-ies).
sl@0: * All rights reserved.
sl@0: * This component and the accompanying materials are made available
sl@0: * under the terms of the License "Eclipse Public License v1.0"
sl@0: * which accompanies this distribution, and is available
sl@0: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: *
sl@0: * Initial Contributors:
sl@0: * Nokia Corporation - initial contribution.
sl@0: *
sl@0: * Contributors:
sl@0: *
sl@0: * Description: Appearance implementation
sl@0: *
sl@0: */
sl@0: 
sl@0: 
sl@0: /*!
sl@0:  * \internal
sl@0:  * \file
sl@0:  * \brief Appearance implementation
sl@0:  */
sl@0: 
sl@0: #ifndef M3G_CORE_INCLUDE
sl@0: #   error included by m3g_core.c; do not compile separately.
sl@0: #endif
sl@0: 
sl@0: #include "m3g_appearance.h"
sl@0: #include "m3g_vertexbuffer.h"
sl@0: 
sl@0: /*----------------------------------------------------------------------
sl@0:  * Private functions
sl@0:  *--------------------------------------------------------------------*/
sl@0: 
sl@0: /*!
sl@0:  * \internal
sl@0:  * \brief Applies default appearance values to OpenGL.
sl@0:  */
sl@0: static void m3gApplyAppearanceDefaults(RenderContext *ctx)
sl@0: {
sl@0:     int i;
sl@0:     m3gApplyCompositingMode(NULL, ctx);
sl@0:     m3gApplyPolygonMode(NULL);
sl@0:     m3gApplyMaterial(NULL, 0x10000);
sl@0: 	m3gApplyFog(NULL);
sl@0: 
sl@0:     for (i = 0; i < M3G_NUM_TEXTURE_UNITS; ++i) {
sl@0:         glActiveTexture(GL_TEXTURE0 + i);
sl@0:         glDisable(GL_TEXTURE_2D);
sl@0:     }
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \internal
sl@0:  * \brief Generate a hash number for a pointer
sl@0:  */
sl@0: static M3Guint m3gGenPointerHash(const void *ptr)
sl@0: {
sl@0:     M3Guint p = ((M3Guint) ptr) >> 2;
sl@0:     M3Guint key = p ^ (p >> 5) ^ (p >> 10) ^ (p >> 15) ^ (p >> 20) ^ (p >> 25);
sl@0:     return key;
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \internal
sl@0:  * \brief Generate a quick hash bit pattern for the textures of this
sl@0:  * appearance object
sl@0:  */
sl@0: static M3Guint m3gGen12BitTextureHash(const Appearance *app)
sl@0: {
sl@0:     M3Guint key = 0; 
sl@0: 	
sl@0:     int i;
sl@0:     
sl@0:     for (i = 0; i < M3G_NUM_TEXTURE_UNITS; ++i) {
sl@0:         const Texture *tex = app->texture[i];
sl@0:         if (tex) {
sl@0:             key ^= (m3gGenPointerHash(m3gGetTextureImage((M3GTexture)tex)) >> i) << 6;
sl@0:             key ^= (m3gGenPointerHash(tex) >> i) & 0x3Fu;
sl@0:         }
sl@0:     }
sl@0:     return key & ((1u<<12)-1);
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \internal
sl@0:  * \brief Generate the sorting key for render queue
sl@0:  *
sl@0:  * Sort key is a combination of user settable layer and
sl@0:  * blending mode. Blended objects are always drawn last.
sl@0:  *
sl@0:  * \param appearance    Appearance object
sl@0:  * \return              sort key
sl@0:  */
sl@0: static void m3gRegenerateSortKey(Appearance *appearance)
sl@0: {
sl@0: 	M3Guint key = 0;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0: 
sl@0:     /*------------------------------------------------------------
sl@0:      * First do the mandatory sorting by layer index and blending
sl@0:      * state; this currently uses the top eight bits, 31..24
sl@0:      *-----------------------------------------------------------*/
sl@0:         
sl@0:     key = (appearance->layer - M3G_APPEARANCE_MIN_LAYER)
sl@0:         << (33 - M3G_APPEARANCE_HARD_SORT_BITS);
sl@0:     
sl@0:     /* NOTE the blending state bit is not set here, but dynamically in
sl@0:      * m3gGetAppearanceSortKey; this way we do not need to implement
sl@0:      * signaling from CompositingMode to Appearance when the blending
sl@0:      * state changes */
sl@0: 
sl@0:     /*-----------------------------------------------------------------
sl@0:      * The rest of the bits, 23..0, affect performance only; ideally,
sl@0:      * these should be sorted so that the more expensive state is in the
sl@0:      * higher bits, but this is largely dependent on the hardware
sl@0:      *----------------------------------------------------------------*/
sl@0: 
sl@0:     /* Texturing changes are often expensive in graphics hardware, so
sl@0:      * we put a hash of the texture objects into the top twelve
sl@0:      * bits
sl@0:      *
sl@0:      * NOTE we do not currently update this if a texture image
sl@0:      * changes, but that shouldn't happen too often and only has
sl@0:      * relatively minor performance implications
sl@0:      */
sl@0: 
sl@0:     key |= m3gGen12BitTextureHash(appearance) << 12;
sl@0: 
sl@0:     /* Use the rest of the bits for the various components; depth
sl@0:      * function changes are another potentially costly operation, so
sl@0:      * put that next */
sl@0: 
sl@0:     key |= (m3gGenPointerHash(appearance->compositingMode) & 0x0Fu) << 8;
sl@0:     key |= (m3gGenPointerHash(appearance->material) & 0x07u) << 5;
sl@0:     key |= (m3gGenPointerHash(appearance->polygonMode) & 0x07u) << 2;
sl@0:     key |= (m3gGenPointerHash(appearance->fog) & 0x03u);
sl@0:     
sl@0:     /* Store the final value */
sl@0:     appearance->sortKey = key;
sl@0: }
sl@0: 
sl@0: /*----------------------------------------------------------------------
sl@0:  * Internal functions
sl@0:  *--------------------------------------------------------------------*/
sl@0: 
sl@0: /*!
sl@0:  * \internal
sl@0:  * \brief Destroys this Appearance object.
sl@0:  *
sl@0:  * \param obj Appearance object
sl@0:  */
sl@0: static void m3gDestroyAppearance(Object *obj)
sl@0: {
sl@0:     int i;
sl@0:     Appearance *appearance = (Appearance *) obj;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0: 
sl@0:     M3G_ASSIGN_REF(appearance->compositingMode, NULL);
sl@0:     M3G_ASSIGN_REF(appearance->fog,             NULL);
sl@0:     M3G_ASSIGN_REF(appearance->material,        NULL);
sl@0:     M3G_ASSIGN_REF(appearance->polygonMode,     NULL);
sl@0:     for (i = 0; i < M3G_NUM_TEXTURE_UNITS; ++i) {
sl@0:         M3G_ASSIGN_REF(appearance->texture[i], NULL);
sl@0:     }
sl@0:     
sl@0:     m3gDestroyObject(obj);
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \internal
sl@0:  * \brief Applies Apperance settings to current OpenGL state
sl@0:  *
sl@0:  * \note m3gReleaseTextures must be called when no longer using this,
sl@0:  * to properly reset texture usage counters and unmap the texture
sl@0:  * images.
sl@0:  * 
sl@0:  * \param appearance    Appearance object
sl@0:  * \param alphaFactor   alpha factor as 1.16 fixed point
sl@0:  */
sl@0: static void m3gApplyAppearance(const Appearance *appearance,
sl@0: 							   RenderContext *ctx,
sl@0:                                M3Gint alphaFactor)
sl@0: {
sl@0:     M3G_ASSERT_GL;
sl@0: 
sl@0:     if (appearance != NULL) {
sl@0:         int i;
sl@0: 
sl@0: #       if defined(M3G_NGL_TEXTURE_API)
sl@0:         m3gLockMemory(M3G_INTERFACE(appearance)); /* for textures */
sl@0: #       endif
sl@0:     
sl@0:         m3gApplyCompositingMode(appearance->compositingMode, ctx);
sl@0:         m3gApplyPolygonMode(appearance->polygonMode);
sl@0:         m3gApplyMaterial(appearance->material, alphaFactor);
sl@0:         m3gApplyFog(appearance->fog);
sl@0: 
sl@0:         for (i = 0; i < M3G_NUM_TEXTURE_UNITS; ++i) {
sl@0:             Texture *tex = appearance->texture[i];
sl@0:             glActiveTexture(GL_TEXTURE0 + i);
sl@0:             if (tex != NULL) {
sl@0:                 glEnable(GL_TEXTURE_2D);
sl@0:                 m3gBindTexture(appearance->texture[i]);
sl@0:             }
sl@0:             else {
sl@0:                 glDisable(GL_TEXTURE_2D);
sl@0:             }
sl@0:         }
sl@0:     }
sl@0:     else {
sl@0:         m3gApplyAppearanceDefaults(ctx);
sl@0:     }
sl@0: 
sl@0:     M3G_ASSERT_GL;
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \internal
sl@0:  * \brief Release the textures bound for this appearance
sl@0:  */
sl@0: static void m3gReleaseTextures(const Appearance *appearance)
sl@0: {
sl@0:     if (appearance != NULL) {
sl@0:         int i;
sl@0: 
sl@0:         for (i = 0; i < M3G_NUM_TEXTURE_UNITS; ++i) {
sl@0:             Texture *tex = appearance->texture[i];
sl@0:             if (tex != NULL) {
sl@0:                 m3gReleaseTexture(tex);
sl@0:             }
sl@0:         }
sl@0: 
sl@0: #       if defined(M3G_NGL_TEXTURE_API)
sl@0:         m3gUnlockMemory(M3G_INTERFACE(appearance));
sl@0: #       endif
sl@0:     }
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \internal
sl@0:  * \brief Overloaded Object3D method.
sl@0:  *
sl@0:  * \param self Appearance object
sl@0:  * \param time current world time
sl@0:  * \return minimum validity
sl@0:  */
sl@0: static M3Gint m3gAppearanceApplyAnimation(Object *self, M3Gint time) {
sl@0:     M3Gint i, validity, minValidity = 0x7fffffff;
sl@0:     Appearance *appearance = (Appearance *)self;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0: 
sl@0:     if (appearance->compositingMode != NULL) {
sl@0:         validity = M3G_VFUNC(Object, appearance->compositingMode, applyAnimation)((Object *)appearance->compositingMode, time);
sl@0:         minValidity = (validity < minValidity ? validity : minValidity);
sl@0:     }
sl@0:     if (appearance->fog != NULL) {
sl@0:         validity = M3G_VFUNC(Object, appearance->fog, applyAnimation)((Object *)appearance->fog, time);
sl@0:         minValidity = (validity < minValidity ? validity : minValidity);
sl@0:     }
sl@0:     if (appearance->material != NULL) {
sl@0:         validity = M3G_VFUNC(Object, appearance->material, applyAnimation)((Object *)appearance->material, time);
sl@0:         minValidity = (validity < minValidity ? validity : minValidity);
sl@0:     }
sl@0:     for (i = 0; i < M3G_NUM_TEXTURE_UNITS; ++i) {
sl@0:         if (appearance->texture[i] != NULL) {
sl@0:             validity = M3G_VFUNC(Object, appearance->texture[i], applyAnimation)((Object *)appearance->texture[i], time);
sl@0:             minValidity = (validity < minValidity ? validity : minValidity);
sl@0:         }
sl@0:     }
sl@0: 
sl@0:     /* no animations can target an Appearance directly, so we need
sl@0:        not call super.applyAnimation() here. */
sl@0:     return minValidity;
sl@0: }    
sl@0: 
sl@0: /*!
sl@0:  * \internal
sl@0:  * \brief Overloaded Object3D method.
sl@0:  */
sl@0: static Object *m3gAppearanceFindID(Object *self, M3Gint userID)
sl@0: {
sl@0:     int i;
sl@0:     Appearance *app = (Appearance *)self;
sl@0:     Object *found = m3gObjectFindID(self, userID);
sl@0:     
sl@0:     if (!found && app->compositingMode) {
sl@0:         found = m3gFindID((Object*) app->compositingMode, userID);
sl@0:     }
sl@0:     if (!found && app->polygonMode) {
sl@0:         found = m3gFindID((Object*) app->polygonMode, userID);
sl@0:     }
sl@0:     if (!found && app->fog) {
sl@0:         found = m3gFindID((Object*) app->fog, userID);
sl@0:     }
sl@0:     if (!found && app->material) {
sl@0:         found = m3gFindID((Object*) app->material, userID);
sl@0:     }
sl@0:     for (i = 0; !found && i < M3G_NUM_TEXTURE_UNITS; ++i) {
sl@0:         if (app->texture[i]) {
sl@0:             found = m3gFindID((Object*) app->texture[i], userID);
sl@0:         }
sl@0:     }
sl@0:     return found;
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \internal
sl@0:  * \brief Overloaded Object3D method.
sl@0:  *
sl@0:  * \param self Appearance object
sl@0:  * \param references array of reference objects
sl@0:  * \return number of references
sl@0:  */
sl@0: static M3Gint m3gAppearanceDoGetReferences(Object *self, Object **references)
sl@0: {
sl@0:     Appearance *app = (Appearance *)self;
sl@0:     M3Gint i, num = m3gObjectDoGetReferences(self, references);
sl@0:     if (app->compositingMode != NULL) {
sl@0:         if (references != NULL)
sl@0:             references[num] = (Object *)app->compositingMode;
sl@0:         num++;
sl@0:     }
sl@0:     if (app->polygonMode != NULL) {
sl@0:         if (references != NULL)
sl@0:             references[num] = (Object *)app->polygonMode;
sl@0:         num++;
sl@0:     }
sl@0:     if (app->fog != NULL) {
sl@0:         if (references != NULL)
sl@0:             references[num] = (Object *)app->fog;
sl@0:         num++;
sl@0:     }
sl@0:     if (app->material != NULL) {
sl@0:         if (references != NULL)
sl@0:             references[num] = (Object *)app->material;
sl@0:         num++;
sl@0:     }
sl@0:     for (i = 0; i < M3G_NUM_TEXTURE_UNITS; i++) {
sl@0:         if (app->texture[i] != NULL) {
sl@0:             if (references != NULL)
sl@0:                 references[num] = (Object *)app->texture[i];
sl@0:             num++;
sl@0:         }
sl@0:     }
sl@0:     return num;
sl@0: }
sl@0: 
sl@0: 
sl@0: /*!
sl@0:  * \internal
sl@0:  * \brief Overloaded Object3D method.
sl@0:  *
sl@0:  * \param originalObj original Appearance object
sl@0:  * \param cloneObj pointer to cloned Appearance object
sl@0:  * \param pairs array for all object-duplicate pairs
sl@0:  * \param numPairs number of pairs
sl@0:  */
sl@0: static M3Gbool m3gAppearanceDuplicate(const Object *originalObj,
sl@0:                                       Object **cloneObj,
sl@0:                                       Object **pairs,
sl@0:                                       M3Gint *numPairs)
sl@0: {
sl@0:     M3Gint i;
sl@0:     Appearance *original = (Appearance *)originalObj;
sl@0:     Appearance *clone = (Appearance *)m3gCreateAppearance(originalObj->interface);
sl@0:     *cloneObj = (Object *)clone;
sl@0:     if (*cloneObj == NULL) {
sl@0:         return M3G_FALSE;
sl@0:     }
sl@0: 
sl@0:     if (m3gObjectDuplicate(originalObj, cloneObj, pairs, numPairs)) {
sl@0:         clone->layer = original->layer;
sl@0:     
sl@0:         M3G_ASSIGN_REF(clone->compositingMode, original->compositingMode);
sl@0:         M3G_ASSIGN_REF(clone->fog, original->fog);
sl@0:         M3G_ASSIGN_REF(clone->polygonMode, original->polygonMode);
sl@0:         M3G_ASSIGN_REF(clone->material, original->material);
sl@0:         for (i = 0; i < M3G_NUM_TEXTURE_UNITS; i++) {
sl@0:             M3G_ASSIGN_REF(clone->texture[i], original->texture[i]);
sl@0:         }
sl@0: 
sl@0:         m3gRegenerateSortKey(clone);
sl@0:         
sl@0:         return M3G_TRUE;
sl@0:     }
sl@0:     else {
sl@0:         return M3G_FALSE;
sl@0:     }
sl@0: }
sl@0: 
sl@0: /*----------------------------------------------------------------------
sl@0:  * Virtual function table
sl@0:  *--------------------------------------------------------------------*/
sl@0: 
sl@0: static const ObjectVFTable m3gvf_Appearance = {
sl@0:     m3gAppearanceApplyAnimation,
sl@0:     m3gObjectIsCompatible,
sl@0:     m3gObjectUpdateProperty,
sl@0:     m3gAppearanceDoGetReferences,
sl@0:     m3gAppearanceFindID,
sl@0:     m3gAppearanceDuplicate,
sl@0:     m3gDestroyAppearance
sl@0: };
sl@0: 
sl@0: 
sl@0: /*----------------------------------------------------------------------
sl@0:  * Public API functions
sl@0:  *--------------------------------------------------------------------*/
sl@0: 
sl@0: /*!
sl@0:  * \brief Creates a new Appearance with default values
sl@0:  *
sl@0:  * \param hInterface            M3G interface
sl@0:  * \retval Appearance new Appearance object
sl@0:  * \retval NULL Appearance creating failed
sl@0:  */
sl@0: /*@access M3GInterface@*/
sl@0: /*@access M3GAppearance@*/
sl@0: M3G_API M3GAppearance m3gCreateAppearance(M3GInterface hInterface)
sl@0: {
sl@0:     Interface *m3g = (Interface *) hInterface;
sl@0:     M3G_VALIDATE_INTERFACE(m3g);
sl@0:     {
sl@0:         Appearance *appearance = m3gAllocZ(m3g, sizeof(Appearance));
sl@0: 
sl@0:         if (appearance != NULL) {
sl@0:     		m3gInitObject(&appearance->object, m3g, M3G_CLASS_APPEARANCE);
sl@0:             m3gRegenerateSortKey(appearance);
sl@0:         }
sl@0:         
sl@0:         return (M3GAppearance) appearance;
sl@0:     }
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \brief Get compositing mode
sl@0:  *
sl@0:  * \param hAppearance Appearance object
sl@0:  * \return CompositingMode object
sl@0:  */
sl@0: M3G_API M3GCompositingMode m3gGetCompositingMode(M3GAppearance hAppearance)
sl@0: {
sl@0:     const Appearance *appearance = (const Appearance *) hAppearance;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0:     return (M3GCompositingMode)(appearance->compositingMode);
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \brief Get fog
sl@0:  *
sl@0:  * \param hAppearance Appearance object
sl@0:  * \return Fog object
sl@0:  */
sl@0: M3G_API M3GFog m3gGetFog(M3GAppearance hAppearance)
sl@0: {
sl@0:     const Appearance *appearance = (const Appearance *) hAppearance;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0:     return (M3GFog)(appearance->fog);
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \brief Get material
sl@0:  *
sl@0:  * \param hAppearance Appearance object
sl@0:  * \return Material object
sl@0:  */
sl@0: M3G_API M3GMaterial m3gGetMaterial(M3GAppearance hAppearance)
sl@0: {
sl@0:     const Appearance *appearance = (const Appearance *) hAppearance;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0:     return (M3GMaterial)(appearance->material);
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \brief Get polygon mode
sl@0:  *
sl@0:  * \param hAppearance Appearance object
sl@0:  * \return PolygonMode object
sl@0:  */
sl@0: M3G_API M3GPolygonMode m3gGetPolygonMode(M3GAppearance hAppearance)
sl@0: {
sl@0:     const Appearance *appearance = (const Appearance *) hAppearance;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0:     return (M3GPolygonMode)(appearance->polygonMode);
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \brief Get texture
sl@0:  *
sl@0:  * \param hAppearance Appearance object
sl@0:  * \param unit texturing unit
sl@0:  * \return Texture2D object
sl@0:  */
sl@0: M3G_API M3GTexture m3gGetTexture(M3GAppearance hAppearance, M3Gint unit)
sl@0: {
sl@0:     const Appearance *appearance = (const Appearance *) hAppearance;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0:     if (!m3gInRange(unit, 0, M3G_NUM_TEXTURE_UNITS - 1)) {
sl@0:         m3gRaiseError(M3G_INTERFACE(appearance), M3G_INVALID_INDEX);
sl@0:         return (M3GTexture) NULL;
sl@0:     }
sl@0:     return (M3GTexture)(appearance->texture[unit]);
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \brief Get layer
sl@0:  *
sl@0:  * \param hAppearance Appearance object
sl@0:  * \return layer number
sl@0:  */
sl@0: M3G_API M3Gint m3gGetLayer(M3GAppearance hAppearance)
sl@0: {
sl@0:     const Appearance *appearance = (const Appearance *) hAppearance;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0:     return appearance->layer;
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \brief Set compositing mode
sl@0:  *
sl@0:  * \param hAppearance Appearance object
sl@0:  * \param hMode CompositingMode object
sl@0:  */
sl@0: M3G_API void m3gSetCompositingMode(M3GAppearance hAppearance,
sl@0:                                    M3GCompositingMode hMode)
sl@0: {
sl@0:     Appearance *appearance = (Appearance *) hAppearance;
sl@0:     CompositingMode *mode = (CompositingMode *) hMode;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0:     
sl@0:     M3G_ASSIGN_REF(appearance->compositingMode, mode);
sl@0: 
sl@0:     m3gRegenerateSortKey(appearance);
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \brief Set polygon mode
sl@0:  *
sl@0:  * \param hAppearance Appearance object
sl@0:  * \param hMode PolygonMode object
sl@0:  */
sl@0: M3G_API void m3gSetPolygonMode(M3GAppearance hAppearance,
sl@0:                                M3GPolygonMode hMode)
sl@0: {
sl@0:     Appearance *appearance = (Appearance *) hAppearance;
sl@0:     PolygonMode *mode = (PolygonMode *) hMode;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0: 
sl@0:     M3G_ASSIGN_REF(appearance->polygonMode, mode);
sl@0: 
sl@0:     m3gRegenerateSortKey(appearance);
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \brief Set layer
sl@0:  *
sl@0:  * \param hAppearance Appearance object
sl@0:  * \param layer layer number
sl@0:  */
sl@0: M3G_API void m3gSetLayer(M3GAppearance hAppearance, M3Gint layer)
sl@0: {
sl@0:     Appearance *appearance = (Appearance *) hAppearance;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0: 
sl@0:     /* Check for errors */
sl@0:     if (!m3gInRange(layer, M3G_APPEARANCE_MIN_LAYER, M3G_APPEARANCE_MAX_LAYER)) {
sl@0:         m3gRaiseError(M3G_INTERFACE(appearance), M3G_INVALID_INDEX);
sl@0:         return;
sl@0:     }
sl@0: 
sl@0:     appearance->layer = (M3Gshort) layer;
sl@0:     
sl@0:     m3gRegenerateSortKey(appearance);
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \brief Set material
sl@0:  *
sl@0:  * \param hAppearance Appearance object
sl@0:  * \param hMaterial Material object
sl@0:  */
sl@0: M3G_API void m3gSetMaterial(M3GAppearance hAppearance,
sl@0:                             M3GMaterial hMaterial)
sl@0: {
sl@0:     Appearance *appearance = (Appearance *) hAppearance;
sl@0:     Material *material = (Material *) hMaterial;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0: 
sl@0:     M3G_ASSIGN_REF(appearance->material, material);
sl@0:     
sl@0:     if (material != NULL) {
sl@0:         appearance->vertexMask |= (M3Gushort)M3G_NORMAL_BIT;
sl@0:     }
sl@0:     else {
sl@0:         appearance->vertexMask &= ~(M3Gushort)M3G_NORMAL_BIT;
sl@0:     }
sl@0: 
sl@0:     m3gRegenerateSortKey(appearance);
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \brief Set texture
sl@0:  *
sl@0:  * \param hAppearance Appearance object
sl@0:  * \param unit texturing unit
sl@0:  * \param hTexture Texture2D object
sl@0:  */
sl@0: M3G_API void m3gSetTexture(M3GAppearance hAppearance,
sl@0:                            M3Gint unit, M3GTexture hTexture)
sl@0: {
sl@0:     Appearance *appearance = (Appearance *) hAppearance;
sl@0:     Texture *texture = (Texture *) hTexture;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0:     
sl@0:     if (!m3gInRange(unit, 0, M3G_NUM_TEXTURE_UNITS - 1)) {
sl@0:         m3gRaiseError(M3G_INTERFACE(appearance), M3G_INVALID_INDEX);
sl@0:         return;
sl@0:     }
sl@0:     
sl@0:     M3G_ASSIGN_REF(appearance->texture[unit], texture);
sl@0:     
sl@0:     if (texture != NULL) {
sl@0:         appearance->vertexMask |= (M3Gushort) (M3G_TEXCOORD0_BIT << unit);
sl@0:     }
sl@0:     else {
sl@0:         appearance->vertexMask &= (M3Gushort) ~(M3G_TEXCOORD0_BIT << unit);
sl@0:     }
sl@0: 
sl@0:     m3gRegenerateSortKey(appearance);
sl@0: }
sl@0: 
sl@0: /*!
sl@0:  * \brief Set fog
sl@0:  *
sl@0:  * \param hAppearance Appearance object
sl@0:  * \param hFog Fog object
sl@0:  */
sl@0: M3G_API void m3gSetFog(M3GAppearance hAppearance, M3GFog hFog)
sl@0: {
sl@0:     Appearance *appearance = (Appearance *) hAppearance;
sl@0:     M3G_VALIDATE_OBJECT(appearance);
sl@0: 	
sl@0: 	M3G_ASSIGN_REF(appearance->fog, hFog);
sl@0: 
sl@0:     m3gRegenerateSortKey(appearance);
sl@0: }
sl@0: