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1// Copyright (C) 2002-2012 Nikolaus Gebhardt
2// This file is part of the "Irrlicht Engine".
3// For conditions of distribution and use, see copyright notice in irrlicht.h
4
5#ifndef __I_TEXTURE_H_INCLUDED__
6#define __I_TEXTURE_H_INCLUDED__
7
8#include "IReferenceCounted.h"
9#include "IImage.h"
10#include "dimension2d.h"
11#include "EDriverTypes.h"
12#include "path.h"
13#include "matrix4.h"
14
15namespace irr
16{
17namespace video
18{
19
20
21//! Enumeration flags telling the video driver in which format textures should be created.
22enum E_TEXTURE_CREATION_FLAG
23{
24 /** Forces the driver to create 16 bit textures always, independent of
25 which format the file on disk has. When choosing this you may lose
26 some color detail, but gain much speed and memory. 16 bit textures can
27 be transferred twice as fast as 32 bit textures and only use half of
28 the space in memory.
29 When using this flag, it does not make sense to use the flags
30 ETCF_ALWAYS_32_BIT, ETCF_OPTIMIZED_FOR_QUALITY, or
31 ETCF_OPTIMIZED_FOR_SPEED at the same time. */
32 ETCF_ALWAYS_16_BIT = 0x00000001,
33
34 /** Forces the driver to create 32 bit textures always, independent of
35 which format the file on disk has. Please note that some drivers (like
36 the software device) will ignore this, because they are only able to
37 create and use 16 bit textures.
38 When using this flag, it does not make sense to use the flags
39 ETCF_ALWAYS_16_BIT, ETCF_OPTIMIZED_FOR_QUALITY, or
40 ETCF_OPTIMIZED_FOR_SPEED at the same time. */
41 ETCF_ALWAYS_32_BIT = 0x00000002,
42
43 /** Lets the driver decide in which format the textures are created and
44 tries to make the textures look as good as possible. Usually it simply
45 chooses the format in which the texture was stored on disk.
46 When using this flag, it does not make sense to use the flags
47 ETCF_ALWAYS_16_BIT, ETCF_ALWAYS_32_BIT, or ETCF_OPTIMIZED_FOR_SPEED at
48 the same time. */
49 ETCF_OPTIMIZED_FOR_QUALITY = 0x00000004,
50
51 /** Lets the driver decide in which format the textures are created and
52 tries to create them maximizing render speed.
53 When using this flag, it does not make sense to use the flags
54 ETCF_ALWAYS_16_BIT, ETCF_ALWAYS_32_BIT, or ETCF_OPTIMIZED_FOR_QUALITY,
55 at the same time. */
56 ETCF_OPTIMIZED_FOR_SPEED = 0x00000008,
57
58 /** Automatically creates mip map levels for the textures. */
59 ETCF_CREATE_MIP_MAPS = 0x00000010,
60
61 /** Discard any alpha layer and use non-alpha color format. */
62 ETCF_NO_ALPHA_CHANNEL = 0x00000020,
63
64 //! Allow the Driver to use Non-Power-2-Textures
65 /** BurningVideo can handle Non-Power-2 Textures in 2D (GUI), but not in 3D. */
66 ETCF_ALLOW_NON_POWER_2 = 0x00000040,
67
68 /** This flag is never used, it only forces the compiler to compile
69 these enumeration values to 32 bit. */
70 ETCF_FORCE_32_BIT_DO_NOT_USE = 0x7fffffff
71};
72
73//! Enum for the mode for texture locking. Read-Only, write-only or read/write.
74enum E_TEXTURE_LOCK_MODE
75{
76 //! The default mode. Texture can be read and written to.
77 ETLM_READ_WRITE = 0,
78
79 //! Read only. The texture is downloaded, but not uploaded again.
80 /** Often used to read back shader generated textures. */
81 ETLM_READ_ONLY,
82
83 //! Write only. The texture is not downloaded and might be uninitialised.
84 /** The updated texture is uploaded to the GPU.
85 Used for initialising the shader from the CPU. */
86 ETLM_WRITE_ONLY
87};
88
89//! Interface of a Video Driver dependent Texture.
90/** An ITexture is created by an IVideoDriver by using IVideoDriver::addTexture
91or IVideoDriver::getTexture. After that, the texture may only be used by this
92VideoDriver. As you can imagine, textures of the DirectX and the OpenGL device
93will, e.g., not be compatible. An exception is the Software device and the
94NULL device, their textures are compatible. If you try to use a texture
95created by one device with an other device, the device will refuse to do that
96and write a warning or an error message to the output buffer.
97*/
98class ITexture : public virtual IReferenceCounted
99{
100public:
101
102 //! constructor
103 ITexture(const io::path& name) : NamedPath(name)
104 {
105 }
106
107 //! Lock function.
108 /** Locks the Texture and returns a pointer to access the
109 pixels. After lock() has been called and all operations on the pixels
110 are done, you must call unlock().
111 Locks are not accumulating, hence one unlock will do for an arbitrary
112 number of previous locks. You should avoid locking different levels without
113 unlocking inbetween, though, because only the last level locked will be
114 unlocked.
115 The size of the i-th mipmap level is defined as max(getSize().Width>>i,1)
116 and max(getSize().Height>>i,1)
117 \param mode Specifies what kind of changes to the locked texture are
118 allowed. Unspecified behavior will arise if texture is written in read
119 only mode or read from in write only mode.
120 Support for this feature depends on the driver, so don't rely on the
121 texture being write-protected when locking with read-only, etc.
122 \param mipmapLevel Number of the mipmapLevel to lock. 0 is main texture.
123 Non-existing levels will silently fail and return 0.
124 \return Returns a pointer to the pixel data. The format of the pixel can
125 be determined by using getColorFormat(). 0 is returned, if
126 the texture cannot be locked. */
127 virtual void* lock(E_TEXTURE_LOCK_MODE mode=ETLM_READ_WRITE, u32 mipmapLevel=0) = 0;
128
129 //! Unlock function. Must be called after a lock() to the texture.
130 /** One should avoid to call unlock more than once before another lock.
131 The last locked mip level will be unlocked. */
132 virtual void unlock() = 0;
133
134 //! Get original size of the texture.
135 /** The texture is usually scaled, if it was created with an unoptimal
136 size. For example if the size was not a power of two. This method
137 returns the size of the texture it had before it was scaled. Can be
138 useful when drawing 2d images on the screen, which should have the
139 exact size of the original texture. Use ITexture::getSize() if you want
140 to know the real size it has now stored in the system.
141 \return The original size of the texture. */
142 virtual const core::dimension2d<u32>& getOriginalSize() const = 0;
143
144 //! Get dimension (=size) of the texture.
145 /** \return The size of the texture. */
146 virtual const core::dimension2d<u32>& getSize() const = 0;
147
148 //! Get driver type of texture.
149 /** This is the driver, which created the texture. This method is used
150 internally by the video devices, to check, if they may use a texture
151 because textures may be incompatible between different devices.
152 \return Driver type of texture. */
153 virtual E_DRIVER_TYPE getDriverType() const = 0;
154
155 //! Get the color format of texture.
156 /** \return The color format of texture. */
157 virtual ECOLOR_FORMAT getColorFormat() const = 0;
158
159 //! Get pitch of the main texture (in bytes).
160 /** The pitch is the amount of bytes used for a row of pixels in a
161 texture.
162 \return Pitch of texture in bytes. */
163 virtual u32 getPitch() const = 0;
164
165 //! Check whether the texture has MipMaps
166 /** \return True if texture has MipMaps, else false. */
167 virtual bool hasMipMaps() const { return false; }
168
169 //! Returns if the texture has an alpha channel
170 virtual bool hasAlpha() const {
171 return getColorFormat () == video::ECF_A8R8G8B8 || getColorFormat () == video::ECF_A1R5G5B5;
172 }
173
174 //! Regenerates the mip map levels of the texture.
175 /** Required after modifying the texture, usually after calling unlock().
176 \param mipmapData Optional parameter to pass in image data which will be
177 used instead of the previously stored or automatically generated mipmap
178 data. The data has to be a continuous pixel data for all mipmaps until
179 1x1 pixel. Each mipmap has to be half the width and height of the previous
180 level. At least one pixel will be always kept.*/
181 virtual void regenerateMipMapLevels(void* mipmapData=0) = 0;
182
183 //! Check whether the texture is a render target
184 /** Render targets can be set as such in the video driver, in order to
185 render a scene into the texture. Once unbound as render target, they can
186 be used just as usual textures again.
187 \return True if this is a render target, otherwise false. */
188 virtual bool isRenderTarget() const { return false; }
189
190 //! Get name of texture (in most cases this is the filename)
191 const io::SNamedPath& getName() const { return NamedPath; }
192
193protected:
194
195 //! Helper function, helps to get the desired texture creation format from the flags.
196 /** \return Either ETCF_ALWAYS_32_BIT, ETCF_ALWAYS_16_BIT,
197 ETCF_OPTIMIZED_FOR_QUALITY, or ETCF_OPTIMIZED_FOR_SPEED. */
198 inline E_TEXTURE_CREATION_FLAG getTextureFormatFromFlags(u32 flags)
199 {
200 if (flags & ETCF_OPTIMIZED_FOR_SPEED)
201 return ETCF_OPTIMIZED_FOR_SPEED;
202 if (flags & ETCF_ALWAYS_16_BIT)
203 return ETCF_ALWAYS_16_BIT;
204 if (flags & ETCF_ALWAYS_32_BIT)
205 return ETCF_ALWAYS_32_BIT;
206 if (flags & ETCF_OPTIMIZED_FOR_QUALITY)
207 return ETCF_OPTIMIZED_FOR_QUALITY;
208 return ETCF_OPTIMIZED_FOR_SPEED;
209 }
210
211 io::SNamedPath NamedPath;
212};
213
214
215} // end namespace video
216} // end namespace irr
217
218#endif
219