View2DShaderGLSL Class Reference

specialized shader that uses GLSL to implement a (up-to) 16 bit Hardware Lut More...

#include <View2DShaderGLSL.h>

Inheritance diagram for View2DShaderGLSL:

Classes
struct	Shader
	Stores a full shader program for the given configuration. More...
struct	ShaderConfig
	Stores a shader configuration. More...

Public Member Functions
	View2DShaderGLSL ()
	~View2DShaderGLSL () override
void	bind (View2DTexture *texture, int tw, int th) override
	binds/activates the shader
const char *	name () override
	get the shader's name
void	unbind () override
	deactivates the shader
Public Member Functions inherited from View2DTextureLUTShader
	View2DTextureLUTShader ()
	~View2DTextureLUTShader () override
void	bindFilterKernelTexture () override
	bind the filter kernel texture
void	bindLutTexture () override
	bind the lut texture to the current texture unit
float	getLutHeightScaleFactor () override
SbVec2s	getLutTextureSize () override
Public Member Functions inherited from View2DShader
	View2DShader ()
virtual	~View2DShader ()
virtual void	getRequiredTextureLayout (View2DTexture *texture, GLuint &format, GLuint &internalFormat, GLuint &transferDataType)
	returns the required texture layout that a GL texture must use, as GL_format enums and datatypes
virtual void	setLut (View2DLut *newLut)
	sets the lut currently used
View2DLut *	getLut ()
	gets the lut
void	invalidateLut ()
	invalidate the lut

Static Public Member Functions
static bool	mayUseShaders ()
	returns if GLSL shaders may be used
static bool	runsInHardware ()
	returns if the shader is supported and would run in hardware (calling this method requires a valid GL context!)
Static Public Member Functions inherited from View2DShader
static void	applyTextureFilter (View2DTextureFilter filter)
	set the correct texture filtering on the currently bound texture

Additional Inherited Members
Protected Member Functions inherited from View2DTextureLUTShader
void	createLutTexture ()
	creates a 2D texture from the shader's LUT
void	updateLutTexture ()
	upload the lut to the texture (texture must be already created)
void	destroyLutTexture ()
	frees the lut texture
void	createFilterKernelTexture ()
	create 1d filter kernel texture (using the approach described in section 20.2 of GPU Gems 2)
void	destroyFilterKernelTexture ()
	destroy the filter kernel
Static Protected Member Functions inherited from View2DTextureLUTShader
static GLint	desiredLutTextureFormat ()
Protected Attributes inherited from View2DTextureLUTShader
ml::GLTexture	_lutTexture
	texture that stores the LUT data
GLint	_lutTextureFormat
ml::GLTexture	_kernelTexture
int	_lutTextureWidth
	power-of-two width of lut texture
int	_lutTextureHeight
	power-of-two height of lut texture
int	_lutHeight
	number of COMPLETE texture rows used by the LUT (an additional row may be used partly)
Protected Attributes inherited from View2DShader
View2DLut *	_lut
	pointer to the LUT data
ml::LUTDataId	_lastLutChangeID
	id of last lut
int	_lastLutSize
	last size of lut

Detailed Description

specialized shader that uses GLSL to implement a (up-to) 16 bit Hardware Lut

The RGBA LookupTable is loaded into a 2D texture of 256 pixels width and dynamic height. The texture lookups and color interpolation is done with two "assembly" fragment programs, one for bilinear interpolation and one for nearest neigbor interpolation. The shader interacts with the View2DTexture and it's bind message is called by each subtexture that the View2DTexture renders. This is done because the size of the textures changes and this size is needed as local parameters in the fragment program.

Definition at line 32 of file View2DShaderGLSL.h.

Constructor & Destructor Documentation

View2DShaderGLSL()

View2DShaderGLSL::View2DShaderGLSL

(

)

~View2DShaderGLSL()

View2DShaderGLSL::~View2DShaderGLSL ( )

override

Member Function Documentation

bind()

void View2DShaderGLSL::bind ( View2DTexture * texture, int tw, int th )

overridevirtual

binds/activates the shader

Implements View2DShader.

mayUseShaders()

static bool View2DShaderGLSL::mayUseShaders ( )

static

returns if GLSL shaders may be used

name()

const char * View2DShaderGLSL::name ( )

overridevirtual

get the shader's name

Implements View2DShader.

runsInHardware()

static bool View2DShaderGLSL::runsInHardware ( )

static

returns if the shader is supported and would run in hardware (calling this method requires a valid GL context!)

unbind()

void View2DShaderGLSL::unbind ( )

overridevirtual

deactivates the shader

Implements View2DShader.

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

• MeVisLab/Standard/Sources/Inventor/SoView2D/View2DShaderGLSL.h