VRS::AlphaTextureShadowTechniqueGL Class Reference
#include <vrs/opengl/depthmapshadowtechniquegl.h>
Public Member Functions | |
| AlphaTextureShadowTechniqueGL (int alphaMapResolution=512) | |
| virtual bool | isSupported (Engine *, bool verbose) const |
| virtual int | rate (Engine *) const |
| VRS_TYPEINFO (AlphaTextureShadowTechniqueGL, ShadowTechniqueTemplateGL) | |
| VRS_SERIALIZABLE (AlphaTextureShadowTechniqueGL) | |
Protected Member Functions | |
| virtual void | startHook (Engine *) |
| called by start() | |
| virtual void | stopHook (Engine *) |
| called by stop() | |
| virtual bool | preparePassHook (Engine *) |
| virtual void | finishPassHook (Engine *) |
| called by finishPass() | |
| virtual void | nextPassHook (Engine *) |
| called by nextPass() | |
| virtual bool | prepareEvalHook (Engine *engine, const Shape *shape) |
| virtual void | finishEvalHook (Engine *engine, const Shape *shape, bool render) |
| virtual void | setupShadowTest (bool onOff, Engine *) |
| virtual void | toggleShadowTest (bool receiving, Engine *) |
Constructor & Destructor Documentation
| VRS::AlphaTextureShadowTechniqueGL::AlphaTextureShadowTechniqueGL | ( | int | alphaMapResolution = 512 |
) |
The AlphaTextureShadowTechniqueGL renders on shapes with active Shadowed attribute a shadow, caused by shapes with active Shadowcasting attribute and the corresponding light source contained in those attributes.
The technique is registered in the ShadowTechniqueGL factory, so normally it is not necessary to use the technique directly. The technique also works directly in the scene graph, though.
Pointlights are not well supported by this Technique. Spotlights could be supported better, but in the moment they are not. So use Distantlights for your shadows right now.
The main idea for this technique is described in the PhD thesis of Wolfgang Heidrich, available at http://www.cs.ubc.ca/~heidrich/Papers/phd.pdf
Member Function Documentation
| virtual bool VRS::AlphaTextureShadowTechniqueGL::isSupported | ( | Engine * | , | |
| bool | verbose | |||
| ) | const [virtual] |
Requires multitexturing, the GL_EXT_texture_env_combine-extension, a stencil buffer and a PBuffer. For the latter on NVidia Cards, use recent drivers. I am not sure of results with other graphic cards.
Implements VRS::ShadowTechniqueTemplateGL.
| virtual int VRS::AlphaTextureShadowTechniqueGL::rate | ( | Engine * | ) | const [virtual] |
For rating this technique in the ShadowTechniqueGL factory. Rating is 100, so less than the DepthTextureShadowTechniqueGL. In doubt this latter technique is chosen.
Implements VRS::ShadowTechniqueTemplateGL.
| VRS::AlphaTextureShadowTechniqueGL::VRS_TYPEINFO | ( | AlphaTextureShadowTechniqueGL | , | |
| ShadowTechniqueTemplateGL | ||||
| ) |
| VRS::AlphaTextureShadowTechniqueGL::VRS_SERIALIZABLE | ( | AlphaTextureShadowTechniqueGL | ) |
| virtual void VRS::AlphaTextureShadowTechniqueGL::startHook | ( | Engine * | ) | [protected, virtual] |
| virtual void VRS::AlphaTextureShadowTechniqueGL::stopHook | ( | Engine * | ) | [protected, virtual] |
| virtual bool VRS::AlphaTextureShadowTechniqueGL::preparePassHook | ( | Engine * | ) | [protected, virtual] |
called by preparePass(). If the result is true, the pass will be evaluated in any case. If the result is false, it is up to the ShadowTechniqueTemplateGL base technique whether the pass is evaluated or not. (see preparePass() )
Implements VRS::ShadowTechniqueTemplateGL.
| virtual void VRS::AlphaTextureShadowTechniqueGL::finishPassHook | ( | Engine * | ) | [protected, virtual] |
| virtual void VRS::AlphaTextureShadowTechniqueGL::nextPassHook | ( | Engine * | ) | [protected, virtual] |
| virtual bool VRS::AlphaTextureShadowTechniqueGL::prepareEvalHook | ( | Engine * | , | |
| const Shape * | ||||
| ) | [protected, virtual] |
called by prepareEval(). If the result is false, the shape will not be rendered in any case. If the result is true, it is up to the ShadowTechniqueTemplateGL base technique whether the shape is rendered or not (see prepareEval() )
Implements VRS::ShadowTechniqueTemplateGL.
| virtual void VRS::AlphaTextureShadowTechniqueGL::finishEvalHook | ( | Engine * | , | |
| const Shape * | , | |||
| bool | render | |||
| ) | [protected, virtual] |
called by finishEval(). render contains the information whether the shape has been rendered or not.
Implements VRS::ShadowTechniqueTemplateGL.
| virtual void VRS::AlphaTextureShadowTechniqueGL::setupShadowTest | ( | bool | onOff, | |
| Engine * | ||||
| ) | [protected, virtual] |
For SIMPLESHADOWADDLIGHT pass, if onOff is true, sets up opengl stenciling and/or blending function in a way that only fragments in light are rendered. If onOff is false, the settings are undone.
Implements VRS::ShadowTechniqueTemplateGL.
| virtual void VRS::AlphaTextureShadowTechniqueGL::toggleShadowTest | ( | bool | receiving, | |
| Engine * | ||||
| ) | [protected, virtual] |
For SIMPLESHADOWADDLIGHT pass, enables resp. disables the fragment check for shadowed regions.
Implements VRS::ShadowTechniqueTemplateGL.
The documentation for this class was generated from the following file: