git-svn-id: http://root.cern.ch/svn/root/trunk@21453 27541ba8-7e3a-0410-8455-c3a389f83636

git-svn-id: http://root.cern.ch/svn/root/trunk@19826 27541ba8-7e3a-0410-8455-c3a389f83636

git-svn-id: http://root.cern.ch/svn/root/trunk@19825 27541ba8-7e3a-0410-8455-c3a389f83636

1. TGLViewer performs internal loop on pad-primitives.
2. Timur: generalization of gl-plot-painters to allow external access.
3. Support usage of gl-plot-painters in gl-viewer.
4. Provide a default gl-sharing context for resource optimization.


git-svn-id: http://root.cern.ch/svn/root/trunk@19153 27541ba8-7e3a-0410-8455-c3a389f83636

Major restructuring of GL viewer-scene relationship (Matevz)
===================================================

The main idea was to generalize current GL infrustructure so that the
following features can be done in the future:

1. Full pad rendering via GL including 3D histo/func painters and 2D graphics.

2. Implementation of GL canvas (with independent viewers serving as pads).

3. Multi-view event-visualization front-end.

4. Inclusion of external scenes (non-ROOT-gl) in ROOT viewer.
   Rendering of ROOT scenes in external GL frameworks.


Changes on the code level
-------------------------

0. Extend current scene/viewer classes into a 2-level class hierarchy.
   New classes TGLViewerBase and TGLSceneBase.

1. Allow scenes to be shared among viewers. View-specific scene-cache
   needs to be kept at the viewer side.

2. Viewer now manages a list of scenes. It is possible to put together
   a combination of scenes (e.g. one showing geometry, another one tracks
   and yet another clusters). Each scene can define its own clipping object.

3. Provide API for fine-grained control over rendered object removal,
   creation and update. This allows for efficient scene-updates.

4. Disentangle selection, clipping and other markup objects from
   within viewer-scene singleton.
   New classes TGLClipSet, TGLManipSet.

6. Disentangle selection management.

7. Separate overlay rendering to allow any number of active GL-GUI
   elements (like manipulators are now).
   New classes TGLOverlayElement.

8. Trailing white space has been removed in all files.


Restructure low-level interface to OpenGL (Timur)
=========================================

1. Allow sharing GL resources among viewers.

2. Do not bind GL-output (windowed or offscreen) to ROOT GUI.

New classes TGLContext, TGLFormat, TGLWidget.

This oboletes TGLKernel and TVirtualGL classes.


git-svn-id: http://root.cern.ch/svn/root/trunk@19000 27541ba8-7e3a-0410-8455-c3a389f83636

1. This is experimental slicing for tf3.
2. Small fix in TGLHistPainter.
3. Small mods in TLGTH3Slice
4. small addition in gltf3 tutorial (commented by defualt) - nice "torus" shape instead of Klein.


git-svn-id: http://root.cern.ch/svn/root/trunk@18963 27541ba8-7e3a-0410-8455-c3a389f83636

  First implementation of the 3D iso surfaces with GL. Example:

  {
     gStyle->SetCanvasPreferGL(true);
     TCanvas * canvas = new TCanvas("C","C",600,600);
     ntuple->Draw("px:py:pz>>h3");
     h3->SetContour(5);
     h3->Draw("gliso");
  }

  (Still needs improvments)


git-svn-id: http://root.cern.ch/svn/root/trunk@18426 27541ba8-7e3a-0410-8455-c3a389f83636

1. TGLParametricEquation. New class to define parametric surface. It can be
   defined by a) three equation in a "string form" (mathematical expression,
   the same as TF2) and as a pointer to function.
2. TGLParametricPlot. Painter to draw parametric surface. It has most of
   features other gl-painters have - box cut, zooming etc. + 21 color
   "schemes": you can change the color of surface (which is under cursor)
   by pressing 's' or 'S' - the same as TGLTF3Painter + wireframe mode ('w' or
   'W' key - temporary solution).


git-svn-id: http://root.cern.ch/svn/root/trunk@17525 27541ba8-7e3a-0410-8455-c3a389f83636

Small fix for user interaction in 16 bit mode.


git-svn-id: http://root.cern.ch/svn/root/trunk@17208 27541ba8-7e3a-0410-8455-c3a389f83636

  User interactions with cut modification


git-svn-id: http://root.cern.ch/svn/root/trunk@16930 27541ba8-7e3a-0410-8455-c3a389f83636

  * Comments added.
  * Box movement fixed - box cannot leave plot's area now.
  * TF3 fixed (selection was incorrect after box cut stopped movement).


git-svn-id: http://root.cern.ch/svn/root/trunk@16910 27541ba8-7e3a-0410-8455-c3a389f83636

  Box cut added for TF3, surface and box painters. To activate it - press c. To
  move this box - select it (it's highligted when selected), press shift and left
  mouse button and move it. Box can move along one of axes - X/Y/Z. Direction is
  shown as a red line. To select direction - press X or Y or Z keys.


git-svn-id: http://root.cern.ch/svn/root/trunk@16875 27541ba8-7e3a-0410-8455-c3a389f83636

Extend the TVirtualGL interface to support 16 & 32 bit display mode.
This is required for the new slicing algorithm (eg to run the tutorial
glbox.C under Windows in 16 bits display mode)


git-svn-id: http://root.cern.ch/svn/root/trunk@16607 27541ba8-7e3a-0410-8455-c3a389f83636

-  Mods for box painter, adding dynamic slicing for TH3 hist.
   try $ROOTSYS/tutorials/glbox.C


git-svn-id: http://root.cern.ch/svn/root/trunk@16397 27541ba8-7e3a-0410-8455-c3a389f83636

git-svn-id: http://root.cern.ch/svn/root/trunk@16188 27541ba8-7e3a-0410-8455-c3a389f83636

New classes:

1.
TGLBoxPainter - implements "glbox" option for TH3, shows bin contents as
boxes, which sizes are proportional to bin content. "glbox1" is the same,
as previous, but with spheres instead of boxes. Slices (XOY/YOZ/XOZ)
are now drawn as sets of rectangles.

2.
TGLLegoPainter. Changes: removed all stuff, which works with gl
projections, modelview transformations, textures, etc.

3.
TGLPlotPainter. Added common parts of different painters:
generic Paint function, PlotSelected, etc.

4.
TGLOrthoCamera. Added operations, required by gl hist painters.

5.
TGLHistPainter. Class completely changed (previously known as
TGLPadHistPainter).

6.
TGLPlotBox. New class, draws back box for different kinds of plots,
highlights planes which are under cursor, makes some sizes calculations
(converts 3d into 2d coords) etc.

7.
TGLSurfacePainter. New class, for different surf options.
Supports cartesian, polar, cylindrical and spherical coords.
Slices (XOY, YOZ, XOZ), projections.

8.
TGLTF3. New class, draws TF3. No slices available now.

9.
TGLUtil. Added new auxilary classes
TGLLevelPalette, TGL2DArray, functions, required by different plot
painters,
TGLEnableGuard and TGLDisableGuard removed from RootGL namespace into
global namespace.


git-svn-id: http://root.cern.ch/svn/root/trunk@16183 27541ba8-7e3a-0410-8455-c3a389f83636

TGLLegoPainter
   "e" option added for cartesian
   bar width/offset added for cartesian
TGLPlotPainter
   normals for trapezoids in polar/cylindrical/spherical
   coordinates are better now, so lego is "smoother".


git-svn-id: http://root.cern.ch/svn/root/trunk@15467 27541ba8-7e3a-0410-8455-c3a389f83636

  notice.


git-svn-id: http://root.cern.ch/svn/root/trunk@15417 27541ba8-7e3a-0410-8455-c3a389f83636

TGLPadHistpainter/TGLAxisPainter/TGLLegoPainter - new hist-painter
infrastructure.

First version of TGLLegoPainter, the new class to support different types
of legos:
gl + lego(1)/lego2 + pol/cyl/sph
gl + lego3

TGLUtil : Small auxilary classes.

IMPORTANT: this lego painter is still experimantal and works only if
it's enabled in system.rootrc. By default, TGLHistPainter is used now.
To enable this new system the line:

Plugin.TGLHistPainter: * TGLHistPainter RGL "TGLHistPainter(TH1*)"

Must be replaced with

Plugin.TGLHistPainter: * TGLPadHistPainter RGL "TGLPadHistPainter(TH1*)"

in $ROOTSYS/etc/system.rootrc


git-svn-id: http://root.cern.ch/svn/root/trunk@15406 27541ba8-7e3a-0410-8455-c3a389f83636