177 lines
6.5 KiB
C++
177 lines
6.5 KiB
C++
// Copyright (C) 2002-2007 Nikolaus Gebhardt
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#ifndef __I_TEXTURE_H_INCLUDED__
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#define __I_TEXTURE_H_INCLUDED__
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#include "IUnknown.h"
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#include "IImage.h"
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#include "dimension2d.h"
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#include "EDriverTypes.h"
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#include "irrString.h"
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#include "matrix4.h"
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namespace irr
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{
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namespace video
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{
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//! Enumeration flags telling the video driver in which format textures
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//! should be created.
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enum E_TEXTURE_CREATION_FLAG
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{
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//! Forces the driver to create 16 bit textures always, independent of
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//! which format the file on disk has. When choosing this you may loose
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//! some color detail, but gain much speed and memory. 16 bit textures
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//! can be transferred twice as fast as 32 bit textures and only use
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//! half of the space in memory.
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//! When using this flag, it does not make sense to use the flags
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//! ETCF_ALWAYS_32_BIT, ETCF_OPTIMIZED_FOR_QUALITY,
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//! or ETCF_OPTIMIZED_FOR_SPEED at the same time.
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ETCF_ALWAYS_16_BIT = 0x00000001,
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//! Forces the driver to create 32 bit textures always, independent of
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//! which format the file on disk has. Please note that some drivers
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//! (like the software device) will ignore this, because they are only
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//! able to create and use 16 bit textures.
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//! When using this flag, it does not make sense to use the flags
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//! ETCF_ALWAYS_16_BIT, ETCF_OPTIMIZED_FOR_QUALITY,
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//! or ETCF_OPTIMIZED_FOR_SPEED at the same time.
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ETCF_ALWAYS_32_BIT = 0x00000002,
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//! Lets the driver decide in which format the textures are created and
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//! tries to make the textures look as good as possible.
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//! Usually it simply chooses the format in which the texture was stored on disk.
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//! When using this flag, it does not make sense to use the flags
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//! ETCF_ALWAYS_16_BIT, ETCF_ALWAYS_32_BIT,
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//! or ETCF_OPTIMIZED_FOR_SPEED at the same time.
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ETCF_OPTIMIZED_FOR_QUALITY = 0x00000004,
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//! Lets the driver decide in which format the textures are created and
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//! tries to create them maximizing render speed.
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//! When using this flag, it does not make sense to use the flags
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//! ETCF_ALWAYS_16_BIT, ETCF_ALWAYS_32_BIT, or ETCF_OPTIMIZED_FOR_QUALITY,
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//! at the same time.
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ETCF_OPTIMIZED_FOR_SPEED = 0x00000008,
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//! Automatically creates mip map levels for the textures.
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ETCF_CREATE_MIP_MAPS = 0x00000010,
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//! Discard any alpha layer and use non-alpha color format.
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ETCF_NO_ALPHA_CHANNEL = 0x00000020,
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//! This flag is never used, it only forces the compiler to
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//! compile these enumeration values to 32 bit.
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ETCF_FORCE_32_BIT_DO_NOT_USE = 0x7fffffff
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};
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//! Helper function, helps to get the desired texture creation format from the flags.
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//! Returns either ETCF_ALWAYS_32_BIT, ETCF_ALWAYS_16_BIT, ETCF_OPTIMIZED_FOR_QUALITY,
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//! or ETCF_OPTIMIZED_FOR_SPEED.
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inline E_TEXTURE_CREATION_FLAG getTextureFormatFromFlags(u32 flags)
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{
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if (flags & ETCF_OPTIMIZED_FOR_SPEED)
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return ETCF_OPTIMIZED_FOR_SPEED;
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if (flags & ETCF_ALWAYS_16_BIT)
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return ETCF_ALWAYS_16_BIT;
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if (flags & ETCF_ALWAYS_32_BIT)
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return ETCF_ALWAYS_32_BIT;
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if (flags & ETCF_OPTIMIZED_FOR_QUALITY)
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return ETCF_OPTIMIZED_FOR_QUALITY;
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return ETCF_OPTIMIZED_FOR_SPEED;
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}
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//! Interface of a Video Driver dependent Texture.
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/**
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An ITexture is created by an IVideoDriver by using IVideoDriver::addTexture or
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IVideoDriver::getTexture. After that, the texture may only be used by this VideoDriver.
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As you can imagine, textures of the DirectX and the OpenGL device will, e.g., not be compatible.
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An exception is the Software device and the NULL device, their textures are compatible.
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If you try to use a texture created by one device with an other device, the device
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will refuse to do that and write a warning or an error message to the output buffer.
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*/
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class ITexture : public virtual IUnknown
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{
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public:
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//! constructor
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ITexture(const c8* name) : Name(name)
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{
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Name.make_lower();
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}
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//! destructor
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virtual ~ITexture() {};
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//! Lock function.
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/** Locks the Texture and returns a pointer to access the
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pixels. After lock() has been called and all operations on the pixels
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are done, you must call unlock().
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\return Returns a pointer to the pixel data. The format of the pixel can
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be determinated by using getColorFormat(). NULL is returned, if
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the texture cannot be locked. */
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virtual void* lock() = 0;
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//! Unlock function. Must be called after a lock() to the texture.
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virtual void unlock() = 0;
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//! Returns original size of the texture.
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/** The texture is usually
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scaled, if it was created with an unoptimal size. For example if the size
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of the texture file it was loaded from was not a power of two. This returns
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the size of the texture, it had before it was scaled. Can be useful
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when drawing 2d images on the screen, which should have the exact size
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of the original texture. Use ITexture::getSize() if you want to know
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the real size it has now stored in the system.
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\return Returns the original size of the texture. */
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virtual const core::dimension2d<s32>& getOriginalSize() = 0;
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//! Returns dimension (=size) of the texture.
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/** \return Returns the size of the texture. */
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virtual const core::dimension2d<s32>& getSize() = 0;
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//! Returns driver type of texture.
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/** This is the driver, which created the texture.
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This method is used internally by the video devices, to check, if they may
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use a texture because textures may be incompatible between different
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devices.
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\return Returns driver type of texture. */
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virtual E_DRIVER_TYPE getDriverType() = 0;
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//! Returns the color format of texture.
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/** \return Returns the color format of texture. */
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virtual ECOLOR_FORMAT getColorFormat() const = 0;
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//! Returns pitch of texture (in bytes).
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/** The pitch is the amount of bytes
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used for a row of pixels in a texture.
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\return Returns pitch of texture in bytes. */
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virtual u32 getPitch() const = 0;
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//! Returns whether the texture has MipMaps
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/** \return Returns true if texture has MipMaps, else false. */
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virtual bool hasMipMaps() const { return false; }
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//! Regenerates the mip map levels of the texture.
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/** Useful after locking and modifying the texture */
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virtual void regenerateMipMapLevels() = 0;
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//! Returns name of texture (in most cases this is the filename)
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const core::stringc& getName() { return Name; }
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protected:
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core::stringc Name;
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};
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} // end namespace video
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} // end namespace irr
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#endif
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