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ACG::GLState Class Reference

`#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