rr_gl::FBO Class Reference

#include <FBO.h>

Public Member Functions
void	restore ()
	FBO ()

Static Public Member Functions
static void	setRenderTarget (GLenum attachment, GLenum target, const Texture *texture, const FBO &oldState)
static void	setRenderTargetGL (GLenum attachment, GLenum target, GLuint texture, const FBO &oldState)
static void	setRenderBuffers (GLenum draw_buffer)
static bool	isOk ()
static const FBO &	getState ()

Detailed Description

Lets you set, save and restore render target.

Constructor & Destructor Documentation

FBO()

rr_gl::FBO::FBO

(

)

Initializes new instance of default framebuffer, without modifying OpenGL state. Calling restore() would restore default framebuffer.

Member Function Documentation

setRenderTarget()

static void rr_gl::FBO::setRenderTarget ( GLenum  attachment, GLenum  target, const Texture *  texture, const FBO &  oldState  )

static

Sets render target.

Default (provided by windowing system) and non-default (texture) targets are never mixed, so by setting texture, any previous default render target is automatically unset. To render to custom color and depth textures, call setRenderTarget twice, once for each texture. To return back to default render target, call restore() on previously backed up state, or on newly constructed FBO.

Parameters

attachment	GL_DEPTH_ATTACHMENT or GL_COLOR_ATTACHMENT0.
target	GL_TEXTURE_2D or GL_TEXTURE_CUBE_MAP_POSITIVE_X or _NEGATIVE_X or _POSITIVE_Y or _NEGATIVE_Y or _POSITIVE_Z or _NEGATIVE_Z.
texture	Texture to be set as render target. May be nullptr. If you set both color and depth, sizes must match.
oldState	When setting nullptr color texture, setRenderBuffers(oldState.buffers) restores old buffers.

setRenderTargetGL()

static void rr_gl::FBO::setRenderTargetGL ( GLenum  attachment, GLenum  target, GLuint  texture, const FBO &  oldState  )

static

Similar to setRenderTarget(), but with raw OpenGL texture id instead of Lightsprint Texture.

setRenderBuffers()

static void rr_gl::FBO::setRenderBuffers ( GLenum  draw_buffer )

static

Wrapper for glDrawBuffer() and glReadBuffer().

It is used internally by setRenderTarget(), it is rarely needed outside. We only use it for setting left&right in quad buffered stereo. Possible parameters: GL_NONE, GL_COLOR_ATTACHMENT0, GL_BACK_LEFT, GL_BACK_RIGHT..

isOk()

static bool rr_gl::FBO::isOk ( )

static

Check whether render target is set correctly (all textures the same size etc).

getState()

static const FBO & rr_gl::FBO::getState ( )

static

Return current state, what textures are set as render target.

restore()

void rr_gl::FBO::restore

(

)

Restore saved state.