Utility functions for working with OpenGL and/or GlImages. More...

Detailed Description

Utility functions for working with OpenGL and/or GlImages.

Functions
std::pair< double, double >	shiftScaleStorageToNormalized (const ImageDescriptor &desc)
	Returns the storage vs.

std::pair< double, double >	shiftScaleOrignalToNormalized (const ImageDescriptor &desc)
	Returns the original vs.

double	storageToNormalized (const ImageDescriptor &desc, double intensity)
	Transforms the given image intensity as stored on the CPU to the normalized intensity range as it is retrieved in GLSL shaders.

double	storageToNormalized (const Image *image, double intensity)

double	normalizedToStorage (const ImageDescriptor &desc, double intensity)
	Transforms the given image intensity from the normalized intensity range as it is retrieved in GLSL shaders to its actual value as stored on the CPU side.

double	normalizedToStorage (const Image *image, double intensity)

vec2	windowLevelOriginalToNormalized (const ImageDescriptor &desc, double window, double level)
	Transforms window/level from original value domain to normalized value domain.

vec2	windowLevelOriginalToNormalized (const Image *image, double window, double level)

vec2	windowLevelNormalizedToOriginal (const ImageDescriptor &desc, double window, double level)
	Transforms window/level from normalized value domain to original value domain.

vec2	windowLevelNormalizedToOriginal (const Image *image, double window, double level)

bool	checkOpenGlStateDefaults ()
	Checks that the current OpenGL state is according to the defined default values.

void	resetOpenGlStateDefaults ()
	Resets the OpenGL state to the following results:

Function Documentation

◆ shiftScaleStorageToNormalized()

std::pair< double, double > shiftScaleStorageToNormalized ( const ImageDescriptor & desc )

Returns the storage vs.

normalized (in GL) constants {normShift, normScale} such that

storage = (normalized * normScale) + normShift

normalized = (storage - normShift) / normScale;

See also: PixelValueDomains

◆ shiftScaleOrignalToNormalized()

std::pair< double, double > shiftScaleOrignalToNormalized ( const ImageDescriptor & desc )

Returns the original vs.

normalized (in GL) constants {totalShift, totalScale} such that

original = (normalized * totalScale) + totalShift

normalized = (original - totalShift) / totalScale

See also: PixelValueDomains

◆ storageToNormalized()

double storageToNormalized	(	const ImageDescriptor &	desc,
		double	intensity )

Transforms the given image intensity as stored on the CPU to the normalized intensity range as it is retrieved in GLSL shaders.

Integral image types (both signed and unsigned) are mapped to [0, 1] range. Float image types keep their domain.

See also: PixelValueDomains

◆ normalizedToStorage()

double normalizedToStorage	(	const ImageDescriptor &	desc,
		double	intensity )

Transforms the given image intensity from the normalized intensity range as it is retrieved in GLSL shaders to its actual value as stored on the CPU side.

Integral image types (both signed and unsigned) are mapped from [0, 1] range. Float image types keep their domain.

See also: PixelValueDomains

◆ windowLevelOriginalToNormalized()

vec2 windowLevelOriginalToNormalized	(	const ImageDescriptor &	desc,
		double	window,
		double	level )

Transforms window/level from original value domain to normalized value domain.

The return value encodes (window, level) as vec2.

See also: PixelValueDomains

◆ windowLevelNormalizedToOriginal()

vec2 windowLevelNormalizedToOriginal	(	const ImageDescriptor &	desc,
		double	window,
		double	level )

Transforms window/level from normalized value domain to original value domain.

The return value encodes (window, level) as vec2.

See also: PixelValueDomains

◆ checkOpenGlStateDefaults()

bool checkOpenGlStateDefaults ( )

Checks that the current OpenGL state is according to the defined default values.

All algorithms/renderers should reset the state to these settings when finished:

GL_DEPTH_DEST: disabled
glDepthFunc: GL_LESS
glClearDepth: 1.0
GL_BLEND: disabled
glBlendFunc: GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA
GL_SCISSOR_TEST: disabled

◆ resetOpenGlStateDefaults()

void resetOpenGlStateDefaults ( )

Resets the OpenGL state to the following results:

GL_DEPTH_DEST: disabled
glDepthFunc: GL_LESS
glClearDepth: 1.0
GL_BLEND: disabled
glBlendFunc: GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA
GL_SCISSOR_TEST: disabled