Image living on the graphics card that can be used for drawing. More...
#include <Texture.hpp>
Public Types | |
enum | CoordinateType { Normalized, Pixels } |
Types of texture coordinates that can be used for rendering. More... | |
Public Member Functions | |
Texture () | |
Default constructor. More... | |
Texture (const Texture ©) | |
Copy constructor. More... | |
~Texture () | |
Destructor. More... | |
bool | create (unsigned int width, unsigned int height) |
Create the texture. More... | |
bool | loadFromFile (const std::string &filename, const IntRect &area=IntRect()) |
Load the texture from a file on disk. More... | |
bool | loadFromMemory (const void *data, std::size_t size, const IntRect &area=IntRect()) |
Load the texture from a file in memory. More... | |
bool | loadFromStream (InputStream &stream, const IntRect &area=IntRect()) |
Load the texture from a custom stream. More... | |
bool | loadFromImage (const Image &image, const IntRect &area=IntRect()) |
Load the texture from an image. More... | |
Vector2u | getSize () const |
Return the size of the texture. More... | |
Image | copyToImage () const |
Copy the texture pixels to an image. More... | |
void | update (const Uint8 *pixels) |
Update the whole texture from an array of pixels. More... | |
void | update (const Uint8 *pixels, unsigned int width, unsigned int height, unsigned int x, unsigned int y) |
Update a part of the texture from an array of pixels. More... | |
void | update (const Image &image) |
Update the texture from an image. More... | |
void | update (const Image &image, unsigned int x, unsigned int y) |
Update a part of the texture from an image. More... | |
void | update (const Window &window) |
Update the texture from the contents of a window. More... | |
void | update (const Window &window, unsigned int x, unsigned int y) |
Update a part of the texture from the contents of a window. More... | |
void | setSmooth (bool smooth) |
Enable or disable the smooth filter. More... | |
bool | isSmooth () const |
Tell whether the smooth filter is enabled or not. More... | |
void | setRepeated (bool repeated) |
Enable or disable repeating. More... | |
bool | isRepeated () const |
Tell whether the texture is repeated or not. More... | |
Texture & | operator= (const Texture &right) |
Overload of assignment operator. More... | |
unsigned int | getNativeHandle () const |
Get the underlying OpenGL handle of the texture. More... | |
Static Public Member Functions | |
static void | bind (const Texture *texture, CoordinateType coordinateType=Normalized) |
Bind a texture for rendering. More... | |
static unsigned int | getMaximumSize () |
Get the maximum texture size allowed. More... | |
Static Private Member Functions | |
static void | ensureGlContext () |
Make sure that a valid OpenGL context exists in the current thread. More... | |
Friends | |
class | RenderTexture |
class | RenderTarget |
Image living on the graphics card that can be used for drawing.
sf::Texture stores pixels that can be drawn, with a sprite for example.
A texture lives in the graphics card memory, therefore it is very fast to draw a texture to a render target, or copy a render target to a texture (the graphics card can access both directly).
Being stored in the graphics card memory has some drawbacks. A texture cannot be manipulated as freely as a sf::Image, you need to prepare the pixels first and then upload them to the texture in a single operation (see Texture::update).
sf::Texture makes it easy to convert from/to sf::Image, but keep in mind that these calls require transfers between the graphics card and the central memory, therefore they are slow operations.
A texture can be loaded from an image, but also directly from a file/memory/stream. The necessary shortcuts are defined so that you don't need an image first for the most common cases. However, if you want to perform some modifications on the pixels before creating the final texture, you can load your file to a sf::Image, do whatever you need with the pixels, and then call Texture::loadFromImage.
Since they live in the graphics card memory, the pixels of a texture cannot be accessed without a slow copy first. And they cannot be accessed individually. Therefore, if you need to read the texture's pixels (like for pixel-perfect collisions), it is recommended to store the collision information separately, for example in an array of booleans.
Like sf::Image, sf::Texture can handle a unique internal representation of pixels, which is RGBA 32 bits. This means that a pixel must be composed of 8 bits red, green, blue and alpha channels – just like a sf::Color.
Usage example:
Like sf::Shader that can be used as a raw OpenGL shader, sf::Texture can also be used directly as a raw texture for custom OpenGL geometry.
Definition at line 47 of file Texture.hpp.
Types of texture coordinates that can be used for rendering.
Enumerator | |
---|---|
Normalized |
Texture coordinates in range [0 .. 1]. |
Pixels |
Texture coordinates in range [0 .. size]. |
Definition at line 55 of file Texture.hpp.
sf::Texture::Texture | ( | ) |
Default constructor.
Creates an empty texture.
sf::Texture::Texture | ( | const Texture & | copy | ) |
Copy constructor.
copy | instance to copy |
sf::Texture::~Texture | ( | ) |
Destructor.
|
static |
Bind a texture for rendering.
This function is not part of the graphics API, it mustn't be used when drawing SFML entities. It must be used only if you mix sf::Texture with OpenGL code.
The coordinateType argument controls how texture coordinates will be interpreted. If Normalized (the default), they must be in range [0 .. 1], which is the default way of handling texture coordinates with OpenGL. If Pixels, they must be given in pixels (range [0 .. size]). This mode is used internally by the graphics classes of SFML, it makes the definition of texture coordinates more intuitive for the high-level API, users don't need to compute normalized values.
texture | Pointer to the texture to bind, can be null to use no texture |
coordinateType | Type of texture coordinates to use |
Image sf::Texture::copyToImage | ( | ) | const |
Copy the texture pixels to an image.
This function performs a slow operation that downloads the texture's pixels from the graphics card and copies them to a new image, potentially applying transformations to pixels if necessary (texture may be padded or flipped).
bool sf::Texture::create | ( | unsigned int | width, |
unsigned int | height | ||
) |
Create the texture.
If this function fails, the texture is left unchanged.
width | Width of the texture |
height | Height of the texture |
|
static |
Get the maximum texture size allowed.
This maximum size is defined by the graphics driver. You can expect a value of 512 pixels for low-end graphics card, and up to 8192 pixels or more for newer hardware.
Note: The first call to this function, whether by your code or SFML will result in a context switch.
unsigned int sf::Texture::getNativeHandle | ( | ) | const |
Get the underlying OpenGL handle of the texture.
You shouldn't need to use this function, unless you have very specific stuff to implement that SFML doesn't support, or implement a temporary workaround until a bug is fixed.
Vector2u sf::Texture::getSize | ( | ) | const |
Return the size of the texture.
bool sf::Texture::isRepeated | ( | ) | const |
Tell whether the texture is repeated or not.
bool sf::Texture::isSmooth | ( | ) | const |
Tell whether the smooth filter is enabled or not.
Load the texture from a file on disk.
This function is a shortcut for the following code:
The area argument can be used to load only a sub-rectangle of the whole image. If you want the entire image then leave the default value (which is an empty IntRect). If the area rectangle crosses the bounds of the image, it is adjusted to fit the image size.
The maximum size for a texture depends on the graphics driver and can be retrieved with the getMaximumSize function.
If this function fails, the texture is left unchanged.
filename | Path of the image file to load |
area | Area of the image to load |
Load the texture from an image.
The area argument can be used to load only a sub-rectangle of the whole image. If you want the entire image then leave the default value (which is an empty IntRect). If the area rectangle crosses the bounds of the image, it is adjusted to fit the image size.
The maximum size for a texture depends on the graphics driver and can be retrieved with the getMaximumSize function.
If this function fails, the texture is left unchanged.
image | Image to load into the texture |
area | Area of the image to load |
bool sf::Texture::loadFromMemory | ( | const void * | data, |
std::size_t | size, | ||
const IntRect & | area = IntRect() |
||
) |
Load the texture from a file in memory.
This function is a shortcut for the following code:
The area argument can be used to load only a sub-rectangle of the whole image. If you want the entire image then leave the default value (which is an empty IntRect). If the area rectangle crosses the bounds of the image, it is adjusted to fit the image size.
The maximum size for a texture depends on the graphics driver and can be retrieved with the getMaximumSize function.
If this function fails, the texture is left unchanged.
data | Pointer to the file data in memory |
size | Size of the data to load, in bytes |
area | Area of the image to load |
bool sf::Texture::loadFromStream | ( | InputStream & | stream, |
const IntRect & | area = IntRect() |
||
) |
Load the texture from a custom stream.
This function is a shortcut for the following code:
The area argument can be used to load only a sub-rectangle of the whole image. If you want the entire image then leave the default value (which is an empty IntRect). If the area rectangle crosses the bounds of the image, it is adjusted to fit the image size.
The maximum size for a texture depends on the graphics driver and can be retrieved with the getMaximumSize function.
If this function fails, the texture is left unchanged.
stream | Source stream to read from |
area | Area of the image to load |
Overload of assignment operator.
right | Instance to assign |
void sf::Texture::setRepeated | ( | bool | repeated | ) |
Enable or disable repeating.
Repeating is involved when using texture coordinates outside the texture rectangle [0, 0, width, height]. In this case, if repeat mode is enabled, the whole texture will be repeated as many times as needed to reach the coordinate (for example, if the X texture coordinate is 3 * width, the texture will be repeated 3 times). If repeat mode is disabled, the "extra space" will instead be filled with border pixels. Warning: on very old graphics cards, white pixels may appear when the texture is repeated. With such cards, repeat mode can be used reliably only if the texture has power-of-two dimensions (such as 256x128). Repeating is disabled by default.
repeated | True to repeat the texture, false to disable repeating |
void sf::Texture::setSmooth | ( | bool | smooth | ) |
Enable or disable the smooth filter.
When the filter is activated, the texture appears smoother so that pixels are less noticeable. However if you want the texture to look exactly the same as its source file, you should leave it disabled. The smooth filter is disabled by default.
smooth | True to enable smoothing, false to disable it |
void sf::Texture::update | ( | const Uint8 * | pixels | ) |
Update the whole texture from an array of pixels.
The pixel array is assumed to have the same size as the area rectangle, and to contain 32-bits RGBA pixels.
No additional check is performed on the size of the pixel array, passing invalid arguments will lead to an undefined behavior.
This function does nothing if pixels is null or if the texture was not previously created.
pixels | Array of pixels to copy to the texture |
void sf::Texture::update | ( | const Uint8 * | pixels, |
unsigned int | width, | ||
unsigned int | height, | ||
unsigned int | x, | ||
unsigned int | y | ||
) |
Update a part of the texture from an array of pixels.
The size of the pixel array must match the width and height arguments, and it must contain 32-bits RGBA pixels.
No additional check is performed on the size of the pixel array or the bounds of the area to update, passing invalid arguments will lead to an undefined behavior.
This function does nothing if pixels is null or if the texture was not previously created.
pixels | Array of pixels to copy to the texture |
width | Width of the pixel region contained in pixels |
height | Height of the pixel region contained in pixels |
x | X offset in the texture where to copy the source pixels |
y | Y offset in the texture where to copy the source pixels |
void sf::Texture::update | ( | const Image & | image | ) |
Update the texture from an image.
Although the source image can be smaller than the texture, this function is usually used for updating the whole texture. The other overload, which has (x, y) additional arguments, is more convenient for updating a sub-area of the texture.
No additional check is performed on the size of the image, passing an image bigger than the texture will lead to an undefined behavior.
This function does nothing if the texture was not previously created.
image | Image to copy to the texture |
void sf::Texture::update | ( | const Image & | image, |
unsigned int | x, | ||
unsigned int | y | ||
) |
Update a part of the texture from an image.
No additional check is performed on the size of the image, passing an invalid combination of image size and offset will lead to an undefined behavior.
This function does nothing if the texture was not previously created.
image | Image to copy to the texture |
x | X offset in the texture where to copy the source image |
y | Y offset in the texture where to copy the source image |
void sf::Texture::update | ( | const Window & | window | ) |
Update the texture from the contents of a window.
Although the source window can be smaller than the texture, this function is usually used for updating the whole texture. The other overload, which has (x, y) additional arguments, is more convenient for updating a sub-area of the texture.
No additional check is performed on the size of the window, passing a window bigger than the texture will lead to an undefined behavior.
This function does nothing if either the texture or the window was not previously created.
window | Window to copy to the texture |
void sf::Texture::update | ( | const Window & | window, |
unsigned int | x, | ||
unsigned int | y | ||
) |
Update a part of the texture from the contents of a window.
No additional check is performed on the size of the window, passing an invalid combination of window size and offset will lead to an undefined behavior.
This function does nothing if either the texture or the window was not previously created.
window | Window to copy to the texture |
x | X offset in the texture where to copy the source window |
y | Y offset in the texture where to copy the source window |