#include <ACG/Scenegraph/GLState.hh>

Public Member Functions
	GLState (bool _updateGL=true, bool _compatibilityProfile=true)
	Default constructor.

	~GLState ()
	destructor

void	makeCurrent ()
	does nothing

void	initialize ()
	initialize all state variables (called by constructor)

bool	updateGL () const
	should GL matrices be updated after each matrix operation

void	set_updateGL (bool _b)
	should GL matrices be updated after each matrix operation

unsigned int	msSinceLastRedraw () const
	time passed since last redraw in milliseconds

void	set_msSinceLastRedraw (unsigned int _ms)
	set time passed since last redraw in milliseconds

void	setState ()
	set the whole stored gl state

void	clearBuffers ()
	clear buffers viewport rectangle

const GLenum &	depthFunc () const
	get glDepthFunc() that is supposed to be active

void	set_depthFunc (const GLenum &_depth_func)
	Call glDepthFunc() to actually change the depth comparison function, and store the new value in this GLState.

Vec3d	project (const Vec3d &_point) const
	project point in world coordinates to window coordinates

Vec3d	unproject (const Vec3d &_winPoint) const
	unproject point in window coordinates _winPoint to world coordinates

void	set_color (const Vec4f &_col)
	set color

const Vec4f &	color ()
	set color

void	set_clear_color (const Vec4f &_col)
	set background color

const Vec4f &	clear_color () const
	get background color

void	set_base_color (const Vec4f &_col)
	set base color (used when lighting is off)

const Vec4f &	base_color () const
	get base color (used when lighting is off)

void	set_ambient_color (const Vec4f &_col)
	set ambient color

const Vec4f &	ambient_color () const
	get ambient color

void	set_diffuse_color (const Vec4f &_col)
	set diffuse color

const Vec4f &	diffuse_color () const
	get diffuse color

void	set_specular_color (const Vec4f &_col)
	set specular color

const Vec4f &	specular_color () const
	get specular color

void	set_overlay_color (const Vec4f &_col)
	set overlay color More...

const Vec4f &	overlay_color () const
	Get overlay color. More...

void	set_shininess (float _shininess)
	set specular shininess (must be in [0, 128])

float	shininess () const
	get specular shininess (must be in [0, 128])

void	set_point_size (float _f)
	set point size

float	point_size () const
	get point size

void	set_line_width (float _f)
	set line width

float	line_width () const
	get line width

void	set_blending (bool _b)
	set whether transparent or solid objects should be drawn

bool	blending ()
	get whether transparenet or solid objects should be drawn

void	set_twosided_lighting (bool _b)
	set whether transparent or solid objects should be drawn

bool	twosided_lighting ()
	get whether transparenet or solid objects should be drawn

void	set_multisampling (bool _b)
	Enable or disable multisampling.

bool	multisampling ()
	Get current multisampling state.

void	allow_multisampling (bool _b)
	Disable multisampling globally.

bool	multisampling_allowed ()
	Check if Multisampling is globally disabled.

int	max_texture_units () const
	Get max number of available texture units.

void	allow_mipmapping (bool _b)
	Allow mipmapping globally. More...

bool	mipmapping_allowed () const
	Get current global mipmapping state.

void	pick_init (bool _color)
	initialize name/color picking stack (like glInitNames()) More...

bool	pick_set_maximum (unsigned int _idx)
	Set the maximal number of primitives/components of your object. More...

void	pick_set_name (unsigned int _idx)
	sets the current name/color (like glLoadName(_idx)) More...

Vec4uc	pick_get_name_color (unsigned int _idx)

void	pick_push_name (unsigned int _idx)
	creates a new name the stack (like glPushName())

void	pick_pop_name ()
	pops the current name from the stack (like glPopName())

std::vector< unsigned int >	pick_color_to_stack (Vec4uc _rgba) const

unsigned int	pick_free_indicies () const
	returns the number of still available colors during color picking

bool	pick_error () const

unsigned int	pick_current_index () const
	Returns the current color picking index (can be used for caching) More...

bool	color_picking () const
	Is color picking active?

set GL projection matrix
void	reset_projection ()
	reset projection matrix (load identity)

void	set_projection (const GLMatrixd &_m)
	set projection

void	set_projection (const GLMatrixd &_m, const GLMatrixd &_inv_m)
	set projection and provide inverse projection matrix

void	ortho (double _left, double _right, double _bottom, double _top, double _near_plane, double _far_plane)
	orthographic projection

void	frustum (double _left, double _right, double _bottom, double _top, double _near_plane, double _far_plane)
	perspective projection

void	perspective (double _fovY, double _aspect, double _near_plane, double _far_plane)
	perspective projection

void	viewport (int _left, int _bottom, int _width, int _height, int _glwidth=0, int _glheight=0)
	set viewport (lower left corner, width, height, glcontext width, height)

set GL modelview matrix
void	reset_modelview ()
	reset modelview matrix (load identity)

void	set_modelview (const GLMatrixd &_m)
	set modelview

void	set_modelview (const GLMatrixd &_m, const GLMatrixd &_inv_m)
	set modelview and provide inverse modelview matrix

void	lookAt (const Vec3d &_eye, const Vec3d &_center, const Vec3d &_up)
	set camera by lookAt

void	translate (double _x, double _y, double _z, MultiplyFrom _mult_from=MULT_FROM_RIGHT)
	translate by (_x, _y, _z)

void	translate (Vec3d _vector, MultiplyFrom _mult_from=MULT_FROM_RIGHT)
	translate by _vector

void	rotate (double _angle, double _x, double _y, double _z, MultiplyFrom _mult_from=MULT_FROM_RIGHT)
	rotate around axis (_x, _y, _z) by _angle

void	scale (double _s)
	scale by (_s, _s, _s)

void	scale (double _s, MultiplyFrom)
	scale by (_s, _s, _s)

void	scale (double _sx, double _sy, double _sz, MultiplyFrom _mult_from=MULT_FROM_RIGHT)
	scale by (_sx, _sy, _sz)

void	mult_matrix (const GLMatrixd &_m, const GLMatrixd &_inv_m, MultiplyFrom _mult_from=MULT_FROM_RIGHT)
	multiply by a given transformation matrix

void	push_projection_matrix ()
	push projection matrix

void	pop_projection_matrix ()
	pop projection matrix

void	push_modelview_matrix ()
	push modelview matrix

void	pop_modelview_matrix ()
	pop modelview matrix

get GL states, matrices and projection details
const GLMatrixd &	projection () const
	get projection matrix

const GLMatrixd &	modelview () const
	get modelview matrix

const GLMatrixd &	viewport () const
	get viewport matrix

GLMatrixd	forward_projection () const
	get forward projection matrix

const GLMatrixd &	inverse_projection () const
	get inverse projection matrix

const GLMatrixd &	inverse_modelview () const
	get inverse modelview matrix

void	get_viewport (int &_left, int &_bottom, int &_width, int &_height) const
	get viewport

int	viewport_width () const
	get viewport width

int	viewport_height () const
	get viewport height

int	context_width () const
	get gl context width

int	context_height () const
	get gl context height

double	near_plane () const
	get near clipping distance

double	far_plane () const
	get far clipping distance

double	fovy () const
	get field of view in y direction

double	aspect () const
	get aspect ratio

Vec3d	eye () const
	get eye point

Vec3d	viewing_direction () const
	get viewing ray

Vec3d	viewing_direction (int _x, int _y) const
	get viewing ray through pixel (_x,_y)

Vec3d	up () const
	get up-vector w.r.t. camera coordinates

Vec3d	right () const
	get right-vector w.r.t. camera coordinates

void	viewing_ray (int _x, int _y, Vec3d &_origin, Vec3d &_direction) const

Static Public Member Functions
static void	syncFromGL ()
	synchronize this class with the OpenGL state machine

static void	depthFunc (GLenum _depthFunc)
	replaces glDepthFunc, supports locking (called in set_depthFunc too)

static void	lockDepthFunc ()

static void	unlockDepthFunc ()

static bool	isDepthFuncLocked ()

glEnable / glDisable functionality
static void	enable (GLenum _cap)
	replaces glEnable, but supports locking

static void	disable (GLenum _cap)
	replaces glDisable, but supports locking

static void	lockState (GLenum _cap)
	locks a specific cap state, such that enable() or disable() has no effect

static void	unlockState (GLenum _cap)
	unlocks a specific cap state

static bool	isStateLocked (GLenum _cap)
	returns true, if a cap state is locked

static bool	isStateEnabled (GLenum _cap)
	returns true, if a cpa state is enabled

static void	enableClientState (GLenum _cap)
	replaces glEnableClientState, supports locking

static void	disableClientState (GLenum _cap)
	replaces glDisableClientState, supports locking

static void	lockClientState (GLenum _cap)
	locks a client state

static void	unlockClientState (GLenum _cap)
	unlocks a client state

static bool	isClientStateEnabled (GLenum _cap)
	returns true, if a client state is enabled

static bool	isClientStateLocked (GLenum _cap)
	returns true, if a client state is locked

static void	blendFunc (GLenum _sfactor, GLenum _dfactor)
	replaces glBlendFunc, supports locking

static void	getBlendFunc (GLenum _sfactor, GLenum _dfactor)
	get blend function, null-ptr safe

static void	lockBlendFunc ()
	lock blend func

static void	unlockBlendFunc ()
	unlock blend func

static bool	isBlendFuncLocked ()
	get blend func locking state

static void	blendFuncSeparate (GLenum _srcRGB, GLenum _dstRGB, GLenum _srcAlpha, GLenum _dstAlpha)
	replaces glBlendFuncSeparate, supports locking

static void	getBlendFuncSeparate (GLenum _srcRGB, GLenum _dstRGB, GLenum _srcAlpha, GLenum _dstAlpha)
	get blend function, null-ptr safe

static void	lockBlendFuncSeparate (bool _rgb=true, bool _alpha=true)
	lock blend func

static void	unlockBlendFuncSeparate ()
	unlock blend func

static bool	isBlendFuncSeparateLocked ()
	get blend func locking state

static bool	isBlendFuncSeparateColorLocked ()
	replaces glEnable, but supports locking

static bool	isBlendFuncSeparateAlphaLocked ()
	replaces glEnable, but supports locking

static void	blendEquation (GLenum _mode)
	replaces glBlendEquation, supports locking

static GLenum	getBlendEquation ()
	get blend equation

static void	lockBlendEquation ()
	lock blend equation

static void	unlockBlendEquation ()
	unlock blend equation

static bool	isBlendEquationLocked ()
	get blend equation locking state

static void	blendColor (GLclampf _red, GLclampf _green, GLclampf _blue, GLclampf _alpha)
	replaces glBlendColor, supports locking

static void	getBlendColor (GLclampf *_col)
	get blend color, not null-ptr safe, 4 element color output: RGBA

static void	lockBlendColor ()
	lock blend color

static void	unlockBlendColor ()
	unlock blend color

static bool	isBlendColorLocked ()
	get blend color locking state

static void	alphaFunc (GLenum _func, GLclampf _ref)
	replaces glAlphaFunc, supports locking

static void	getAlphaFunc (GLenum _func, GLclampf _ref)
	get alpha function, null-ptr safe

static void	lockAlphaFunc ()
	lock alpha func

static void	unlockAlphaFunc ()
	unlock alpha func

static bool	isAlphaFuncLocked ()
	get alpha func locking state

static void	shadeModel (GLenum _mode)
	replaces glShadeModel, supports locking

static GLenum	getShadeModel ()
	get current shade model

static void	lockShadeModel ()
	lock shade model

static void	unlockShadeModel ()
	unlock shade model

static bool	isShadeModelLocked ()
	get shade model locking state

static void	cullFace (GLenum _mode)
	replaces glCullFace, supports locking

static GLenum	getCullFace ()
	get current cull face

static void	lockCullFace ()
	lock cull face

static void	unlockCullFace ()
	unlock cull face

static bool	isCullFaceLocked ()
	get cull face locking state

static void	depthRange (GLclampd _zNear, GLclampd _zFar)
	replaces glDepthRange, supports locking

static void	getDepthRange (GLclampd _zNearOut, GLclampd _zFarOut)
	get current depth range

static void	lockDepthRange ()
	lock depth range

static void	unlockDepthRange ()
	unlock depth range

static bool	isDepthRangeLocked ()
	get depth range locking state

GL vertex pointers
static void	vertexPointer (GLint _size, GLenum _type, GLsizei _stride, const GLvoid *_pointer)
	replaces glVertexPointer, supports locking

static void	getVertexPointer (GLint _size, GLenum _type, GLsizei _stride, const GLvoid *_pointer)
	get vertex pointer, null-ptr safe

static void	vertexPointer (const Vec2f *_p)
	Wrapper: glVertexPointer for Vec2f.

static void	vertexPointer (const Vec2d *_p)
	Wrapper: glVertexPointer for Vec2d.

static void	vertexPointer (const Vec3f *_p)
	Wrapper: glVertexPointer for Vec3f.

static void	vertexPointer (const Vec3d *_p)
	Wrapper: glVertexPointer for Vec3d.

static void	vertexPointer (const Vec4f *_p)
	Wrapper: glVertexPointer for Vec4f.

static void	vertexPointer (const Vec4d *_p)
	Wrapper: glVertexPointer for Vec4d.

static void	lockVertexPointer ()
	lock vertex pointer

static void	unlockVertexPointer ()
	unlock vertex pointer

static bool	isVertexPointerLocked ()
	get vertex pointer lock state

static void	normalPointer (GLenum _type, GLsizei _stride, const GLvoid *_pointer)
	replaces glNormalPointer, supports locking

static void	getNormalPointer (GLenum _type, GLsizei _stride, const GLvoid **_pointer)
	get normal pointer, null-ptr safe

static void	normalPointer (const Vec3f *_p)
	Wrapper: glNormalPointer for Vec3f.

static void	normalPointer (const Vec3d *_p)
	Wrapper: glNormalPointer for Vec3d.

static void	lockNormalPointer ()
	lock normal pointer

static void	unlockNormalPointer ()
	unlock normal pointer

static bool	isNormalPointerLocked ()
	get normal pointer lock state

static void	colorPointer (GLint _size, GLenum _type, GLsizei _stride, const GLvoid *_pointer)
	replaces glColorPointer, supports locking

static void	getColorPointer (GLint _size, GLenum _type, GLsizei _stride, const GLvoid *_pointer)
	get color pointer, null-ptr safe

static void	colorPointer (const Vec3uc *_p)
	Wrapper: glColorPointer for Vec3uc.

static void	colorPointer (const Vec3f *_p)
	Wrapper: glColorPointer for Vec3f.

static void	colorPointer (const Vec4uc *_p)
	Wrapper: glColorPointer for Vec4uc.

static void	colorPointer (const Vec4f *_p)
	Wrapper: glColorPointer for Vec4f.

static void	lockColorPointer ()
	lock color pointer

static void	unlockColorPointer ()
	unlock vertex pointer

static bool	isColorPointerLocked ()
	get vertex pointer lock state

static void	texcoordPointer (GLint _size, GLenum _type, GLsizei _stride, const GLvoid *_pointer)
	replaces glTexcoordPointer, supports locking

static void	getTexcoordPointer (GLint _size, GLenum _type, GLsizei _stride, const GLvoid *_pointer)
	get color pointer, null-ptr safe

static void	texcoordPointer (const float *_p)
	Wrapper: glTexcoordPointer for float.

static void	texcoordPointer (const double *_p)
	Wrapper: glTexcoordPointer for double.

static void	texcoordPointer (const Vec2f *_p)
	Wrapper: glTexcoordPointer for Vec2f.

static void	texcoordPointer (const Vec2d *_p)
	Wrapper: glTexcoordPointer for Vec2d.

static void	texcoordPointer (const Vec3f *_p)
	Wrapper: glTexcoordPointer for Vec3f.

static void	texcoordPointer (const Vec3d *_p)
	Wrapper: glTexcoordPointer for Vec3d.

static void	texcoordPointer (const Vec4f *_p)
	Wrapper: glTexcoordPointer for Vec4f.

static void	texcoordPointer (const Vec4d *_p)
	Wrapper: glTexcoordPointer for Vec4d.

static void	lockTexcoordPointer ()
	lock color pointer

static void	unlockTexcoordPointer ()
	unlock vertex pointer

static bool	isTexcoordPointerLocked ()
	get vertex pointer lock state

GL buffer binding
static void	genBuffersARB (GLsizei n, GLuint *buffers)

static void	genBuffers (GLsizei n, GLuint *buffers)

static void	bufferDataARB (GLenum target, GLsizeiptrARB size, const GLvoid *data, GLenum usage)

static void	bufferData (GLenum target, GLsizeiptr size, const GLvoid *data, GLenum usage)

static GLvoid *	mapBuffer (GLenum target, GLenum access)

static GLboolean	unmapBuffer (GLenum target)

static void	deleteBuffers (GLsizei n, const GLuint *buffers)

static void	bindBuffer (GLenum _target, GLuint _buffer)
	replaces glBindBuffer, supports locking

static void	bindBufferARB (GLenum _target, GLuint _buffer)
	same function as bindBuffer

static void	lockBufferTarget (GLenum _target)
	lock buffer target

static void	unlockBufferTarget (GLenum _target)
	unlock buffer target

static bool	isBufferTargetLocked (GLenum _target)
	get buffer target locking state

static GLuint	getBoundBuf (GLenum _target)
	get currently bound buffer

static void	drawBuffer (GLenum _mode)
	replaces glDrawBuffer, supports locking

static void	drawBuffers (GLsizei _n, const GLenum *_bufs)
	replaces glDrawBuffers, supports locking

static void	lockDrawBuffer ()
	lock draw buffer state, applies to drawBuffer and drawBuffers

static void	unlockDrawBuffer ()
	unlock draw buffer state

static bool	isDrawBufferLocked ()
	get draw buffer lock state

static void	bindFramebuffer (GLenum _target, GLuint _framebuffer)
	replaces glBindFramebuffer, supports locking

static GLuint	getFramebufferDraw ()
	get current draw framebuffer of a target More...

static GLuint	getFramebufferRead ()
	get current read framebuffer of a target More...

static void	lockFramebuffer (GLenum _target)
	lock a framebuffer target

static void	unlockFramebuffer (GLenum _target)
	unlock a framebuffer target

static bool	isFramebufferLocked (GLenum _target)
	get framebuffer target lock state

GL shader program binding
static void	useProgram (GLuint _program)
	replaces glUseProgram, supports locking

static GLuint	getProgram ()
	get bound program

static void	lockProgram ()
	lock the program

static void	unlockProgram ()
	unlock the program

static bool	isProgramLocked ()
	get program locking state

GL texture binding
static void	activeTexture (GLenum _texunit)
	replaces glActiveTexture, no locking support

static void	activeTextureARB (GLenum _texunit)
	same functiona as activeTexture

static GLenum	getActiveTexture ()
	get active GL texture

static int	getActiveTextureIndex ()
	get active texture as zero based index

static void	bindTexture (GLenum _target, GLuint _buffer)
	replaces glBindTexture, supports locking

static void	lockTextureStage ()
	locks the current texture stage (set by setActiveTexture)

static void	unlockTextureStage ()
	unlocks the current texture target

static bool	isTextureTargetLocked ()
	get texture target locking state

static GLuint	getBoundTextureBuffer ()
	get bound texture

static GLenum	getBoundTextureTarget ()
	get bound texture target

Static Public Attributes
static const Vec4f	default_clear_color
	default value for clear color

static const Vec4f	default_base_color
	default value for base color

static const Vec4f	default_ambient_color
	default value for ambient color

static const Vec4f	default_diffuse_color
	default value for diffuse color

static const Vec4f	default_specular_color
	default value for specular color

static const Vec4f	default_overlay_color
	default value for overlay color

static const float	default_shininess
	default value for shininess

Static Private Member Functions
static int	getBufferTargetIndex (GLenum _target)
	bijective map from GLenum buffer_target to [0..3], -1 if unsupported

Private Attributes
std::stack< GLMatrixd >	stack_projection_

std::stack< GLMatrixd >	stack_modelview_

std::stack< GLMatrixd >	stack_inverse_projection_

std::stack< GLMatrixd >	stack_inverse_modelview_

GLMatrixd	projection_

GLMatrixd	inverse_projection_

GLMatrixd	modelview_

GLMatrixd	inverse_modelview_

GLMatrixd	window2viewport_

GLMatrixd	inverse_window2viewport_

int	left_

int	bottom_

int	width_

int	height_

int	glwidth_

int	glheight_

double	near_plane_

double	far_plane_

Vec4f	clear_color_

Vec4f	color_

Vec4f	base_color_

Vec4f	ambient_color_

Vec4f	diffuse_color_

Vec4f	specular_color_

Vec4f	overlay_color_

float	shininess_

float	point_size_

float	line_width_

bool	twosided_lighting_

bool	multisampling_

bool	allow_multisampling_

bool	mipmapping_

bool	updateGL_

bool	blending_

unsigned int	msSinceLastRedraw_

ColorStack	colorStack_

bool	colorPicking_

Static Private Attributes
static int	num_texture_units_ = 0

static bool	depthFuncLock_ = false

static std::deque< GLStateContext >	stateStack_

static GLenum	glStateCaps [95]

static std::bitset< 0xFFFF+1 >	glStateLock_

static bool	blendFuncSeparateLock_ [2] = { false }

static bool	blendEquationLock_ = false

static bool	blendColorLock_ = false

static bool	alphaFuncLock_ = false

static bool	depthRangeLock_ = false

static int	glBufferTargetLock_ [4] = {0}

static int	glTextureStageLock_ [16] = {0}

static bool	shadeModelLock_ = false

static bool	cullFaceLock_ = false

static bool	vertexPointerLock_ = false

static bool	normalPointerLock_ = false

static bool	texcoordPointerLock_ = false

static bool	colorPointerLock_ = false

static bool	drawBufferLock_ = false

static bool	framebufferLock_ [2] = {false}

static bool	programLock_ = false

static int	maxTextureCoords_ = 0

static int	maxCombinedTextureImageUnits_ = 0

static int	maxDrawBuffers_ = 0

Profile setter
bool	compatibilityProfile_

void	setCompatibilityProfile (bool _compatibility)

bool	compatibilityProfile () const

Render pass controls
unsigned int	render_pass_

unsigned int	max_render_passes_

unsigned int	render_pass () const
	get current render pass counter

void	reset_render_pass ()
	reset render pass counter

void	next_render_pass ()
	increment render pass counter

unsigned int	max_render_passes () const
	get maximum number of render passes

void	set_max_render_passes (const unsigned int _max)
	set maximum number of render passes

Scene Infos
ACG::Vec3d	bb_min_

ACG::Vec3d	bb_max_

void	set_bounding_box (ACG::Vec3d _min, ACG::Vec3d _max)

void	get_bounding_box (ACG::Vec3d &_min, ACG::Vec3d &_max)

Detailed Description

This class stores all relevant OpenGL states and can therefore provide some nice and efficient functions like projecting, unprojecting, eye point or viewing direction.

Note: This class needs an OpenGL context. This is currently given in a QGLContext.

The projection matrix

The GLState class stores its own projection matrix which is of type GLMatrixT. Creating a viewing frustum of a perspective projection will result in the following projection matrix:

Where n is the orthogonal distance from the viewing plane (near plane) to the eye position, f is the orthogonal distance from the back clipping plane (far plane) to the eye position, l, r, t, b are scalars indicating the left, right, top and bottom coordinates of the viewing plane (so in fact we have a rectangle between the points (b,l) and (t,r)) and phi is the opening angle (field of view), also see figure 1.

Figure 1. A schematic illustration of a viewing frustum

Some useful values that can directly be computed out of the projection matrix:

Computing the fovy out of the projection matrix

Computing the aspect out of the projection matrix

Definition at line 220 of file GLState.hh.

Member Function Documentation

void ACG::GLState::allow_mipmapping ( bool _b )

inline

Allow mipmapping globally.

Note: This actually does not change the opengl state since mipmapping is turned on/off via texture parameters To change the behaviour see in TextureNode

Definition at line 1071 of file GLState.hh.

void ACG::GLState::bufferData	(	GLenum	target,
		GLsizeiptr	size,
		const GLvoid *	data,
		GLenum	usage
	)

static

Simple wrapper around glBufferData. Useful where glew cannot be included.

Definition at line 2100 of file GLState.cc.

void ACG::GLState::bufferDataARB	(	GLenum	target,
		GLsizeiptrARB	size,
		const GLvoid *	data,
		GLenum	usage
	)

static

Simple wrapper around glBufferDataARB. Useful where glew cannot be included.

Definition at line 2095 of file GLState.cc.

void ACG::GLState::deleteBuffers	(	GLsizei	n,
		const GLuint *	buffers
	)

static

Simple wrapper around glDeleteBuffers. Useful where glew cannot be included.

Definition at line 2105 of file GLState.cc.

void ACG::GLState::genBuffers	(	GLsizei	n,
		GLuint *	buffers
	)

static

Simple wrapper around glGenBuffers. Useful where glew cannot be included.

Definition at line 2091 of file GLState.cc.

void ACG::GLState::genBuffersARB	(	GLsizei	n,
		GLuint *	buffers
	)

static

Simple wrapper around glGenBuffersARB. Useful where glew cannot be included.

Definition at line 2087 of file GLState.cc.

void ACG::GLState::get_bounding_box	(	ACG::Vec3d &	_min,
		ACG::Vec3d &	_max
	)

Get the current bounding box of the scene. This has to be set before traversal happens in the viewer by using set_bounding_box

Definition at line 809 of file GLState.cc.

GLuint ACG::GLState::getFramebufferDraw ( )

static

get current draw framebuffer of a target

get current framebuffer of a target

Definition at line 1994 of file GLState.cc.

GLuint ACG::GLState::getFramebufferRead ( )

static

get current read framebuffer of a target

get current framebuffer of a target

Definition at line 2002 of file GLState.cc.

GLvoid * ACG::GLState::mapBuffer	(	GLenum	target,
		GLenum	access
	)

static

Simple wrapper around glMapBuffer. Useful where glew cannot be included.

Definition at line 2109 of file GLState.cc.

const Vec4f& ACG::GLState::overlay_color ( ) const

inline

Get overlay color.

This color does not set an opengl state but can be used to store an additional color for a wireframe.

Definition at line 958 of file GLState.hh.

std::vector< unsigned int > ACG::GLState::pick_color_to_stack ( Vec4uc _rgba ) const

converts the given color to index values on the stack (only used in color picking) This can be compared to the results of the selection buffer results

Definition at line 1087 of file GLState.cc.

unsigned int ACG::GLState::pick_current_index ( ) const

Returns the current color picking index (can be used for caching)

Is this value equal to a value used in a previous picking run, then the same colors will be used. In this case a previously calculated color array/display list can be reused.

This is basically the name of the whole object ( which would be the same as the name of the first component of the object), not the name of the primitives/components in the object!

Definition at line 1114 of file GLState.cc.

bool ACG::GLState::pick_error ( ) const

Did an error occur during picking (only used in color picking) Mostly to small color depth or wrong handling of pick_set_maximum

Definition at line 1105 of file GLState.cc.

Vec4uc ACG::GLState::pick_get_name_color ( unsigned int _idx )

returns the color that will be used for index _idx during color picking if this index will be set with pick_set_name. This can be used to generate color arrays instead of using direct gl calls for each primitive

Definition at line 1064 of file GLState.cc.

void ACG::GLState::pick_init ( bool _color )

initialize name/color picking stack (like glInitNames())

Follows the OpenGL selection buffer implementation (OpenGL Red Book Chapter 13) http://www.glprogramming.com/red/chapter13.html

Color picking is another method to realize picking. This functions replace the original OpenGL functions, to allow the handling of selection buffer picking and color based picking with the same code.

Definition at line 1039 of file GLState.cc.

bool ACG::GLState::pick_set_maximum ( unsigned int _idx )

Set the maximal number of primitives/components of your object.

Sets the maximum used name index at current stack position (only used in color picking) A restriction inside the color picking implementation forces to set the maximum used number for the following pick_set_name calls between the two pick_push_name/pick_pop_name calls.

If you create picking for your nodes, the values set with pick_set_name have to be between zero and this value.

Definition at line 1047 of file GLState.cc.

void ACG::GLState::pick_set_name ( unsigned int _idx )

sets the current name/color (like glLoadName(_idx))

This will be the index of the primitive/component in the object. If you create picking for your nodes, the values set here will be returned as the target index. So if your object has three parts, you call pick_set_name(0), than render the first component and then pick_set_name(1), ...

If you perform the picking and click on the second component, the returned index will be 1 as set in the node.

Definition at line 1057 of file GLState.cc.

void ACG::GLState::set_bounding_box	(	ACG::Vec3d	_min,
		ACG::Vec3d	_max
	)

Provide scene Information about the boundingbox via this function It is not computed by the state itself!!

Definition at line 802 of file GLState.cc.

void ACG::GLState::set_overlay_color ( const Vec4f & _col )

set overlay color

This color does not set an opengl state but can be used to store an additional color for a wireframe

Definition at line 750 of file GLState.cc.

GLboolean ACG::GLState::unmapBuffer ( GLenum target )

static

Simple wrapper around glUnmapBuffer. Useful where glew cannot be included.

Definition at line 2114 of file GLState.cc.

void ACG::GLState::viewing_ray	(	int	_x,
		int	_y,
		Vec3d &	_origin,
		Vec3d &	_direction
	)		const

get viewing ray (_orgin & _direction) through pixel (_x,_y). _direction will be nornalized.

Definition at line 926 of file GLState.cc.

Member Data Documentation

ACG::Vec3d ACG::GLState::bb_max_

private

Provide scene Information about the boundingbox via this function It is not computed by the state itself!!

Definition at line 1028 of file GLState.hh.

ACG::Vec3d ACG::GLState::bb_min_

private

Provide scene Information about the boundingbox via this function It is not computed by the state itself!!

Definition at line 1028 of file GLState.hh.

unsigned int ACG::GLState::max_render_passes_

private

holds the maximum render pass number this has to be set externally

Definition at line 1008 of file GLState.hh.

unsigned int ACG::GLState::render_pass_

private

holds the current render pass number (1-indexed) this has to be set externally

Definition at line 1004 of file GLState.hh.

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

ACG/GL/GLState.hh
ACG/GL/GLState.cc

Public Member Functions

Static Public Member Functions

Static Public Attributes

Static Private Member Functions

Private Attributes

Static Private Attributes

Profile setter

Render pass controls

Scene Infos

Detailed Description

The projection matrix

Member Function Documentation

Member Data Documentation