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Object-Oriented Graphics Rendering Engine
Ogre::GLTextureManager Class Reference

GL-specific implementation of a TextureManager. More...

#include <OgreGLTextureManager.h>

+ Inheritance diagram for Ogre::GLTextureManager:

Public Member Functions

 GLTextureManager (GLRenderSystem *renderSystem)
 
virtual ~GLTextureManager ()
 
PixelFormat getNativeFormat (TextureType ttype, PixelFormat format, int usage) override
 Gets the format which will be natively used for a requested format given the constraints of the current device. More...
 
bool isHardwareFilteringSupported (TextureType ttype, PixelFormat format, int usage, bool preciseFormatOnly=false) override
 Returns whether this render system has hardware filtering supported for the texture format requested with the given usage options. More...
 
- Public Member Functions inherited from Ogre::TextureManager
 TextureManager (void)
 
virtual ~TextureManager ()
 
const TexturePtr_getWarningTexture ()
 Internal method to create a warning texture (bound when a texture unit is blank) More...
 
TexturePtr create (const String &name, const String &group, bool isManual=false, ManualResourceLoader *loader=0, const NameValuePairList *createParams=0)
 Create a new texture. More...
 
virtual TexturePtr createManual (const String &name, const String &group, TextureType texType, uint width, uint height, uint depth, int numMipmaps, PixelFormat format, int usage=TU_DEFAULT, ManualResourceLoader *loader=0, bool hwGammaCorrection=false, uint fsaa=0, const String &fsaaHint=BLANKSTRING)
 Create a manual texture with specified width, height and depth (not loaded from a file). More...
 
TexturePtr createManual (const String &name, const String &group, TextureType texType, uint width, uint height, int numMipmaps, PixelFormat format, int usage=TU_DEFAULT, ManualResourceLoader *loader=0, bool hwGammaCorrection=false, uint fsaa=0, const String &fsaaHint=BLANKSTRING)
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts. More...
 
ResourceCreateOrRetrieveResult createOrRetrieve (const String &name, const String &group, bool isManual, ManualResourceLoader *loader, const NameValuePairList *createParams, TextureType texType, int numMipmaps=MIP_DEFAULT, Real gamma=1.0f, bool isAlpha=false, PixelFormat desiredFormat=PF_UNKNOWN, bool hwGammaCorrection=false)
 
SamplerPtr createSampler (const String &name=BLANKSTRING)
 create a new sampler More...
 
TexturePtr getByName (const String &name, const String &groupName=RGN_DEFAULT) const
 Retrieves a pointer to a resource by name, or null if the resource does not exist. More...
 
virtual uint32 getDefaultNumMipmaps ()
 Gets the default number of mipmaps to be used for loaded textures. More...
 
const SamplerPtrgetDefaultSampler ()
 get the default sampler More...
 
virtual ushort getPreferredFloatBitDepth (void) const
 Gets preferred bit depth for float pixel format textures. More...
 
virtual ushort getPreferredIntegerBitDepth (void) const
 Gets preferred bit depth for integer pixel format textures. More...
 
const SamplerPtrgetSampler (const String &name) const
 retrieve an named sampler More...
 
virtual bool isEquivalentFormatSupported (TextureType ttype, PixelFormat format, int usage)
 Returns whether this render system can support the texture format requested with the given usage options, or another format with no quality reduction. More...
 
virtual bool isFormatSupported (TextureType ttype, PixelFormat format, int usage)
 Returns whether this render system can natively support the precise texture format requested with the given usage options. More...
 
TexturePtr load (const String &name, const String &group, TextureType texType=TEX_TYPE_2D, int numMipmaps=MIP_DEFAULT, Real gamma=1.0f, PixelFormat desiredFormat=PF_UNKNOWN, bool hwGammaCorrection=false)
 Loads a texture from a file. More...
 
TexturePtr load (const String &name, const String &group, TextureType texType, int numMipmaps, Real gamma, bool isAlpha, PixelFormat desiredFormat=PF_UNKNOWN, bool hwGammaCorrection=false)
 
virtual TexturePtr loadImage (const String &name, const String &group, const Image &img, TextureType texType=TEX_TYPE_2D, int numMipmaps=MIP_DEFAULT, Real gamma=1.0f, bool isAlpha=false, PixelFormat desiredFormat=PF_UNKNOWN, bool hwGammaCorrection=false)
 Loads a texture from an Image object. More...
 
virtual TexturePtr loadRawData (const String &name, const String &group, DataStreamPtr &stream, ushort width, ushort height, PixelFormat format, TextureType texType=TEX_TYPE_2D, int numMipmaps=MIP_DEFAULT, Real gamma=1.0f, bool hwGammaCorrection=false)
 Loads a texture from a raw data stream. More...
 
TexturePtr prepare (const String &name, const String &group, TextureType texType=TEX_TYPE_2D, int numMipmaps=MIP_DEFAULT, Real gamma=1.0f, bool isAlpha=false, PixelFormat desiredFormat=PF_UNKNOWN, bool hwGammaCorrection=false)
 Prepares to loads a texture from a file. More...
 
void removeAllNamedSamplers ()
 clear the list of named samplers More...
 
virtual void setDefaultNumMipmaps (uint32 num)
 Sets the default number of mipmaps to be used for loaded textures, for when textures are loaded automatically (e.g. More...
 
virtual void setPreferredBitDepths (ushort integerBits, ushort floatBits, bool reloadTextures=true)
 Sets preferred bit depth for integer and float pixel format. More...
 
virtual void setPreferredFloatBitDepth (ushort bits, bool reloadTextures=true)
 Sets preferred bit depth for float pixel format textures. More...
 
virtual void setPreferredIntegerBitDepth (ushort bits, bool reloadTextures=true)
 Sets preferred bit depth for integer pixel format textures. More...
 
- Public Member Functions inherited from Ogre::ResourceManager
 ResourceManager ()
 
virtual ~ResourceManager ()
 
virtual void _notifyResourceLoaded (Resource *res)
 Notify this manager that a resource which it manages has been loaded. More...
 
virtual void _notifyResourceTouched (Resource *res)
 Notify this manager that a resource which it manages has been 'touched', i.e. More...
 
virtual void _notifyResourceUnloaded (Resource *res)
 Notify this manager that a resource which it manages has been unloaded. More...
 
ResourceCreateOrRetrieveResult createOrRetrieve (const String &name, const String &group, bool isManual=false, ManualResourceLoader *loader=0, const NameValuePairList *createParams=0)
 Create a new resource, or retrieve an existing one with the same name if it already exists. More...
 
ResourcePtr createResource (const String &name, const String &group, bool isManual=false, ManualResourceLoader *loader=0, const NameValuePairList *createParams=0)
 Creates a new blank resource, but does not immediately load it. More...
 
void destroyAllResourcePools ()
 destroy all pools More...
 
void destroyResourcePool (ResourcePool *pool)
 Destroy a resource pool. More...
 
void destroyResourcePool (const String &name)
 Destroy a resource pool. More...
 
virtual ResourcePtr getByHandle (ResourceHandle handle) const
 Retrieves a pointer to a resource by handle, or null if the resource does not exist. More...
 
Real getLoadingOrder (void) const override
 Gets the loading order for scripts of this type. More...
 
size_t getMemoryBudget (void) const
 Get the limit on the amount of memory this resource handler may use. More...
 
size_t getMemoryUsage (void) const
 Gets the current memory usage, in bytes. More...
 
virtual ResourcePtr getResourceByName (const String &name, const String &groupName=RGN_DEFAULT) const
 Retrieves a pointer to a resource by name, or null if the resource does not exist. More...
 
ResourceMapIterator getResourceIterator (void)
 Returns an iterator over all resources in this manager. More...
 
ResourcePoolgetResourcePool (const String &name)
 Create a resource pool, or reuse one that already exists. More...
 
const StringgetResourceType (void) const
 Gets a string identifying the type of resource this manager handles. More...
 
const StringVectorgetScriptPatterns (void) const override
 Gets the file patterns which should be used to find scripts for this class. More...
 
bool getVerbose (void)
 Gets whether this manager and its resources habitually produce log output. More...
 
ResourcePtr load (const String &name, const String &group, bool isManual=false, ManualResourceLoader *loader=0, const NameValuePairList *loadParams=0, bool backgroundThread=false)
 Generic load method, used to create a Resource specific to this ResourceManager without using one of the specialised 'load' methods (containing per-Resource-type parameters). More...
 
void parseScript (DataStreamPtr &stream, const String &groupName) override
 Parse a script file. More...
 
ResourcePtr prepare (const String &name, const String &group, bool isManual=false, ManualResourceLoader *loader=0, const NameValuePairList *loadParams=0, bool backgroundThread=false)
 Generic prepare method, used to create a Resource specific to this ResourceManager without using one of the specialised 'prepare' methods (containing per-Resource-type parameters). More...
 
void reloadAll (bool reloadableOnly=true)
 Caused all currently loaded resources to be reloaded. More...
 
virtual void reloadAll (Resource::LoadingFlags flags)
 Caused all currently loaded resources to be reloaded. More...
 
void reloadUnreferencedResources (bool reloadableOnly=true)
 Caused all currently loaded but not referenced by any other object resources to be reloaded. More...
 
void remove (const ResourcePtr &r)
 Remove a single resource. More...
 
void remove (const String &name, const String &group=RGN_DEFAULT)
 
void remove (ResourceHandle handle)
 
virtual void removeAll (void)
 Removes all resources. More...
 
virtual void removeUnreferencedResources (bool reloadableOnly=true)
 Remove all resources which are not referenced by any other object. More...
 
bool resourceExists (const String &name, const String &group=RGN_DEFAULT) const
 Returns whether the named resource exists in this manager. More...
 
bool resourceExists (ResourceHandle handle) const
 Returns whether a resource with the given handle exists in this manager. More...
 
void setMemoryBudget (size_t bytes)
 Set a limit on the amount of memory this resource handler may use. More...
 
void setVerbose (bool v)
 Sets whether this manager and its resources habitually produce log output. More...
 
void unload (const String &name, const String &group=RGN_DEFAULT)
 Unloads a single resource by name. More...
 
void unload (ResourceHandle handle)
 Unloads a single resource by handle. More...
 
void unloadAll (bool reloadableOnly=true)
 Unloads all resources. More...
 
virtual void unloadAll (Resource::LoadingFlags flags)
 Unloads all resources. More...
 
void unloadUnreferencedResources (bool reloadableOnly=true)
 Unload all resources which are not referenced by any other object. More...
 
- Public Member Functions inherited from Ogre::ScriptLoader
virtual ~ScriptLoader ()
 
- Public Member Functions inherited from Ogre::Singleton< TextureManager >
 Singleton (void)
 
 ~Singleton (void)
 

Additional Inherited Members

- Public Types inherited from Ogre::ResourceManager
typedef std::pair< ResourcePtr, bool > ResourceCreateOrRetrieveResult
 
typedef std::map< ResourceHandle, ResourcePtrResourceHandleMap
 
typedef std::unordered_map< String, ResourcePtrResourceMap
 
typedef MapIterator< ResourceHandleMapResourceMapIterator
 
typedef std::unordered_map< String, ResourceMapResourceWithGroupMap
 
- Static Public Member Functions inherited from Ogre::TextureManager
static TextureManagergetSingleton (void)
 Get the singleton instance. More...
 
static TextureManagergetSingletonPtr (void)
 Get the singleton instance. More...
 
- Static Public Member Functions inherited from Ogre::Singleton< TextureManager >
static TextureManagergetSingleton (void)
 Get the singleton instance. More...
 
static TextureManagergetSingletonPtr (void)
 Get the singleton instance. More...
 

Detailed Description

GL-specific implementation of a TextureManager.

Constructor & Destructor Documentation

◆ GLTextureManager()

Ogre::GLTextureManager::GLTextureManager ( GLRenderSystem renderSystem)

◆ ~GLTextureManager()

virtual Ogre::GLTextureManager::~GLTextureManager ( )
virtual

Member Function Documentation

◆ getNativeFormat()

PixelFormat Ogre::GLTextureManager::getNativeFormat ( TextureType  ttype,
PixelFormat  format,
int  usage 
)
overridevirtual

Gets the format which will be natively used for a requested format given the constraints of the current device.

Implements Ogre::TextureManager.

◆ isHardwareFilteringSupported()

bool Ogre::GLTextureManager::isHardwareFilteringSupported ( TextureType  ttype,
PixelFormat  format,
int  usage,
bool  preciseFormatOnly = false 
)
overridevirtual

Returns whether this render system has hardware filtering supported for the texture format requested with the given usage options.

Not all texture format are supports filtering by the hardware, i.e. some cards support floating point format, but it doesn't supports filtering on the floating point texture at all, or only a subset floating point formats have flitering supported.

In the case you want to write shader to work with floating point texture, and you want to produce better visual quality, it's necessary to flitering the texture manually in shader (potential requires four or more texture fetch instructions, plus several arithmetic instructions) if filtering doesn't supported by hardware. But in case on the hardware that supports floating point filtering natively, it had better to adopt this capability for performance (because only one texture fetch instruction are required) and doesn't loss visual quality.
This method allow you queries hardware texture filtering capability to deciding which version of the shader to be used. Note it's up to you to write multi-version shaders for support various hardware, internal engine can't do that for you automatically.
Note
Under GL, texture filtering are always supported by driver, but if it's not supported by hardware natively, software simulation will be used, and you will end up with very slow speed (less than 0.1 fps for example). To slove this performance problem, you must disable filtering manually (by use filtering none in the material script's texture_unit section, or call TextureUnitState::setTextureFiltering with TFO_NONE if populate material in code).
Parameters
ttypeThe texture type requested
formatThe pixel format requested
usageThe kind of usage this texture is intended for, a combination of the TextureUsage flags.
preciseFormatOnlyWhether precise or fallback format mode is used to detecting. In case the pixel format doesn't supported by device, false will be returned if in precise mode, and natively used pixel format will be actually use to check if in fallback mode.
Returns
true if the texture filtering is supported.

Reimplemented from Ogre::TextureManager.


The documentation for this class was generated from the following file: