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gl::PixelBuffer< T > Class Template Reference

Wrapper around a pixel buffer. More...

#include <GLUtil.hh>

Inheritance diagram for gl::PixelBuffer< T >:
Inheritance graph
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Public Member Functions

 PixelBuffer ()=default
 
 PixelBuffer (PixelBuffer &&other) noexcept
 
PixelBufferoperator= (PixelBuffer &&other) noexcept
 
void setImage (GLuint width, GLuint height)
 Sets the image for this buffer. More...
 
void bind () const
 Bind this PixelBuffer. More...
 
void unbind () const
 Unbind this buffer. More...
 
T * getOffset (GLuint x, GLuint y)
 Gets a pointer relative to the start of this buffer. More...
 
T * mapWrite ()
 Maps the contents of this buffer into memory. More...
 
void unmap () const
 Unmaps the contents of this buffer. More...
 

Detailed Description

template<typename T>
class gl::PixelBuffer< T >

Wrapper around a pixel buffer.

The pixel buffer will be allocated in VRAM if possible, in main RAM otherwise. The pixel type is templatized T.

Note: openGL ES 2.0 does not yet support this. So for now we always use the fallback implementation, maybe we can re-enable this when we switch to openGL ES 3.0.

Definition at line 151 of file GLUtil.hh.

Constructor & Destructor Documentation

◆ PixelBuffer() [1/2]

template<typename T >
gl::PixelBuffer< T >::PixelBuffer ( )
default

◆ PixelBuffer() [2/2]

template<typename T >
gl::PixelBuffer< T >::PixelBuffer ( PixelBuffer< T > &&  other)
noexcept

Definition at line 232 of file GLUtil.hh.

Member Function Documentation

◆ bind()

template<typename T >
void gl::PixelBuffer< T >::bind

Bind this PixelBuffer.

Must be called before the methods getOffset() or mapWrite() are used. (Is a wrapper around glBindBuffer).

Definition at line 270 of file GLUtil.hh.

Referenced by openmsx::GLHQLiteScaler::uploadBlock(), and openmsx::GLHQScaler::uploadBlock().

◆ getOffset()

template<typename T >
T * gl::PixelBuffer< T >::getOffset ( GLuint  x,
GLuint  y 
)

Gets a pointer relative to the start of this buffer.

You must not dereference this pointer, but you can pass it to glTexImage etc when this buffer is bound as the source.

Precondition
This PixelBuffer must be bound (see bind()) before calling this method.

Definition at line 286 of file GLUtil.hh.

References openmsx::x.

Referenced by openmsx::GLHQLiteScaler::uploadBlock(), and openmsx::GLHQScaler::uploadBlock().

◆ mapWrite()

template<typename T >
T * gl::PixelBuffer< T >::mapWrite

Maps the contents of this buffer into memory.

The returned buffer is write-only (reading could be very slow or even result in a segfault).

Returns
Pointer through which you can write pixels to this buffer, or 0 if the buffer could not be mapped.
Precondition
This PixelBuffer must be bound (see bind()) before calling this method.

Definition at line 299 of file GLUtil.hh.

Referenced by openmsx::GLHQLiteScaler::uploadBlock(), and openmsx::GLHQScaler::uploadBlock().

◆ operator=()

template<typename T >
PixelBuffer< T > & gl::PixelBuffer< T >::operator= ( PixelBuffer< T > &&  other)
noexcept

Definition at line 242 of file GLUtil.hh.

References std::swap().

◆ setImage()

template<typename T >
void gl::PixelBuffer< T >::setImage ( GLuint  width,
GLuint  height 
)

Sets the image for this buffer.

TODO: Actually, only image size for now; later, if we need it, image data too.

Definition at line 252 of file GLUtil.hh.

Referenced by openmsx::GLHQLiteScaler::GLHQLiteScaler(), and openmsx::GLHQScaler::GLHQScaler().

◆ unbind()

template<typename T >
void gl::PixelBuffer< T >::unbind

Unbind this buffer.

Definition at line 278 of file GLUtil.hh.

Referenced by openmsx::GLHQLiteScaler::uploadBlock(), and openmsx::GLHQScaler::uploadBlock().

◆ unmap()

template<typename T >
void gl::PixelBuffer< T >::unmap

Unmaps the contents of this buffer.

After this call, you must no longer use the pointer returned by mapWrite.

Definition at line 310 of file GLUtil.hh.

Referenced by openmsx::GLHQLiteScaler::uploadBlock(), and openmsx::GLHQScaler::uploadBlock().


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