Package panamagl.platform.linux

Class FBO_linux

java.lang.Object

panamagl.offscreen.AFBO

panamagl.platform.linux.FBO_linux

All Implemented Interfaces:

panamagl.offscreen.FBO

public class FBO_linux
extends panamagl.offscreen.AFBO
implements panamagl.offscreen.FBO

A frame buffer object, or FBO_linux, can render OpenGL into an offscreen buffer that can later be converted to an Image. See : https://www.khronos.org/opengl/wiki/Framebuffer_Object https://www.khronos.org/opengl/wiki/Common_Mistakes https://www.khronos.org/opengl/wiki/Framebuffer_Object_Extension_Examples#Quick_example,_render_to_texture_(2D) Hint : to debug this class, invoke a program using it with flag -Dpanamagl.offscreen.FBO

Author:

Martin Pernollet

Field Summary

Fields

Modifier and Type	Field	Description
protected boolean	arrayExport
protected int	border
protected int	channels
protected Arena	classArena	Memory arena to load OpenGL extension.
protected MemorySegment	glBindFramebuffer
protected MemorySegment	glBindRenderbuffer
protected MemorySegment	glCheckFramebufferStatus
protected MemorySegment	glDeleteFramebuffers
protected MemorySegment	glDeleteRenderbuffers
protected MemorySegment	glFramebufferRenderbuffer
protected MemorySegment	glFramebufferTexture2D
protected MemorySegment	glGenFramebuffers
protected MemorySegment	glGenRenderbuffers
protected MemorySegment	glRenderbufferStorage
protected static int	INT_SIZE
protected int	level

Fields inherited from class panamagl.offscreen.AFBO

auto, debug, format, frameBufferIds, height, idFrameBuffer, idRenderBuffer, idTexture, internalFormat, pixelBuffer, pixels, prepared, renderArena, renderBufferIds, textureBufferIds, textureType, width

Constructor Summary

Constructors

Constructor	Description
FBO_linux()
FBO_linux(int width, int height)

Method Summary

Modifier and Type	Method	Description
protected void	init()	Initialize pointers to OpenGL extensions allowing to perform offscreen rendering
void	prepare(panamagl.opengl.GL gl)	Allocate memory segments required to perform offscreen rendering using the frame buffer object, unless resource have already been prepared.
MemorySegment	readPixels(panamagl.opengl.GL gl)	Return all pixels.
void	release(panamagl.opengl.GL gl)	Release resources held by this FBO utility.
protected void	unbindFramebuffer()

Methods inherited from class panamagl.offscreen.AFBO

diagnoseError, getHeight, getWidth, isPrepared, prepareRenderArena, releaseRenderArena, resize

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface panamagl.offscreen.FBO

getHeight, getWidth, isPrepared, resize

Field Details

level

protected int level

border

protected int border

channels

protected int channels

arrayExport

protected boolean arrayExport

classArena

protected Arena classArena

Memory arena to load OpenGL extension. Will live until this class dies.

glGenFramebuffers

protected MemorySegment glGenFramebuffers

glBindFramebuffer

protected MemorySegment glBindFramebuffer

glFramebufferTexture2D

protected MemorySegment glFramebufferTexture2D

glGenRenderbuffers

protected MemorySegment glGenRenderbuffers

glBindRenderbuffer

protected MemorySegment glBindRenderbuffer

glRenderbufferStorage

protected MemorySegment glRenderbufferStorage

glFramebufferRenderbuffer

protected MemorySegment glFramebufferRenderbuffer

glCheckFramebufferStatus

protected MemorySegment glCheckFramebufferStatus

glDeleteRenderbuffers

protected MemorySegment glDeleteRenderbuffers

glDeleteFramebuffers

protected MemorySegment glDeleteFramebuffers

INT_SIZE

protected static int INT_SIZE

Constructor Details

FBO_linux

public FBO_linux()

FBO_linux

public FBO_linux(int width,
 int height)

Method Details

init

protected void init()

Initialize pointers to OpenGL extensions allowing to perform offscreen rendering

prepare

public void prepare(panamagl.opengl.GL gl)

Allocate memory segments required to perform offscreen rendering using the frame buffer object, unless resource have already been prepared. All memory segments are freed by calling release(GL).

Specified by:

prepare in interface panamagl.offscreen.FBO

release

public void release(panamagl.opengl.GL gl)

Release resources held by this FBO utility.

Specified by:

release in interface panamagl.offscreen.FBO

readPixels

public MemorySegment readPixels(panamagl.opengl.GL gl)

Return all pixels. Their lifetime is bounded to the AFBO.renderArena.

Specified by:

readPixels in interface panamagl.offscreen.FBO

unbindFramebuffer

protected void unbindFramebuffer()