1 // Created on: 2013-10-02
2 // Created by: Denis BOGOLEPOV
3 // Copyright (c) 2013-2014 OPEN CASCADE SAS
5 // This file is part of Open CASCADE Technology software library.
7 // This library is free software; you can redistribute it and/or modify it under
8 // the terms of the GNU Lesser General Public License version 2.1 as published
9 // by the Free Software Foundation, with special exception defined in the file
10 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
11 // distribution for complete text of the license and disclaimer of any warranty.
13 // Alternatively, this file may be used under the terms of Open CASCADE
14 // commercial license or contractual agreement.
16 #ifndef OpenGl_ShaderStates_HeaderFile
17 #define OpenGl_ShaderStates_HeaderFile
19 #include <Graphic3d_RenderTransparentMethod.hxx>
20 #include <Graphic3d_LightSet.hxx>
21 #include <OpenGl_Element.hxx>
22 #include <OpenGl_Vec.hxx>
24 class OpenGl_ShadowMapArray;
26 //! Defines interface for OpenGL state.
27 class OpenGl_StateInterface
31 //! Creates new state.
32 Standard_EXPORT OpenGl_StateInterface();
34 //! Returns current state index.
35 Standard_Size Index() const { return myIndex; }
37 //! Increment current state.
38 void Update() { ++myIndex; }
42 Standard_Size myIndex; //!< current state index
46 //! Defines state of OCCT projection transformation.
47 class OpenGl_ProjectionState : public OpenGl_StateInterface
51 //! Creates uninitialized projection state.
52 Standard_EXPORT OpenGl_ProjectionState();
54 //! Sets new projection matrix.
55 Standard_EXPORT void Set (const OpenGl_Mat4& theProjectionMatrix);
57 //! Returns current projection matrix.
58 const OpenGl_Mat4& ProjectionMatrix() const { return myProjectionMatrix; }
60 //! Returns inverse of current projection matrix.
61 Standard_EXPORT const OpenGl_Mat4& ProjectionMatrixInverse() const;
65 OpenGl_Mat4 myProjectionMatrix; //!< OCCT projection matrix
66 mutable OpenGl_Mat4 myProjectionMatrixInverse; //!< Inverse of OCCT projection matrix
67 mutable bool myInverseNeedUpdate; //!< Is inversed matrix outdated?
71 //! Defines state of OCCT model-world transformation.
72 class OpenGl_ModelWorldState : public OpenGl_StateInterface
76 //! Creates uninitialized model-world state.
77 Standard_EXPORT OpenGl_ModelWorldState();
79 //! Sets new model-world matrix.
80 Standard_EXPORT void Set (const OpenGl_Mat4& theModelWorldMatrix);
82 //! Returns current model-world matrix.
83 const OpenGl_Mat4& ModelWorldMatrix() const { return myModelWorldMatrix; }
85 //! Returns inverse of current model-world matrix.
86 Standard_EXPORT const OpenGl_Mat4& ModelWorldMatrixInverse() const;
90 OpenGl_Mat4 myModelWorldMatrix; //!< OCCT model-world matrix
91 mutable OpenGl_Mat4 myModelWorldMatrixInverse; //!< Inverse of OCCT model-world matrix
92 mutable bool myInverseNeedUpdate; //!< Is inversed matrix outdated?
96 //! Defines state of OCCT world-view transformation.
97 class OpenGl_WorldViewState : public OpenGl_StateInterface
101 //! Creates uninitialized world-view state.
102 Standard_EXPORT OpenGl_WorldViewState();
104 //! Sets new world-view matrix.
105 Standard_EXPORT void Set (const OpenGl_Mat4& theWorldViewMatrix);
107 //! Returns current world-view matrix.
108 const OpenGl_Mat4& WorldViewMatrix() const { return myWorldViewMatrix; }
110 //! Returns inverse of current world-view matrix.
111 Standard_EXPORT const OpenGl_Mat4& WorldViewMatrixInverse() const;
115 OpenGl_Mat4 myWorldViewMatrix; //!< OCCT world-view matrix
116 mutable OpenGl_Mat4 myWorldViewMatrixInverse; //!< Inverse of OCCT world-view matrix
117 mutable bool myInverseNeedUpdate; //!< Is inversed matrix outdated?
121 //! Defines state of OCCT light sources.
122 class OpenGl_LightSourceState : public OpenGl_StateInterface
126 //! Creates uninitialized state of light sources.
127 OpenGl_LightSourceState() : mySpecIBLMapLevels (0), myToCastShadows (Standard_True) {}
129 //! Sets new light sources.
130 void Set (const Handle(Graphic3d_LightSet)& theLightSources) { myLightSources = theLightSources; }
132 //! Returns current list of light sources.
133 const Handle(Graphic3d_LightSet)& LightSources() const { return myLightSources; }
135 //! Returns number of mipmap levels used in specular IBL map.
136 //! 0 by default or in case of using non-PBR shading model.
137 Standard_Integer SpecIBLMapLevels() const { return mySpecIBLMapLevels; }
139 //! Sets number of mipmap levels used in specular IBL map.
140 void SetSpecIBLMapLevels(Standard_Integer theSpecIBLMapLevels) { mySpecIBLMapLevels = theSpecIBLMapLevels; }
142 //! Returns TRUE if shadowmap is set.
143 bool HasShadowMaps() const { return myToCastShadows && !myShadowMaps.IsNull(); }
145 //! Returns shadowmap.
146 const Handle(OpenGl_ShadowMapArray)& ShadowMaps() const { return myShadowMaps; }
149 void SetShadowMaps (const Handle(OpenGl_ShadowMapArray)& theMap) { myShadowMaps = theMap; }
151 //! Returns TRUE if shadowmap should be enabled when available; TRUE by default.
152 bool ToCastShadows() const { return myToCastShadows; }
154 //! Set if shadowmap should be enabled when available.
155 void SetCastShadows (bool theToCast) { myToCastShadows = theToCast; }
159 Handle(Graphic3d_LightSet) myLightSources; //!< List of OCCT light sources
160 Standard_Integer mySpecIBLMapLevels; //!< Number of mipmap levels used in specular IBL map (0 by default or in case of using non-PBR shading model)
161 Handle(OpenGl_ShadowMapArray) myShadowMaps; //!< active shadowmap
162 Standard_Boolean myToCastShadows; //!< enable/disable shadowmap
166 //! Defines generic state of OCCT clipping state.
167 class OpenGl_ClippingState
171 //! Creates new clipping state.
172 Standard_EXPORT OpenGl_ClippingState();
174 //! Returns current state index.
175 Standard_Size Index() const { return myIndex; }
177 //! Updates current state.
178 Standard_EXPORT void Update();
180 //! Reverts current state.
181 Standard_EXPORT void Revert();
185 Standard_Size myIndex; //!< Current state index
186 Standard_Size myNextIndex; //!< Next state index
187 NCollection_List<Standard_Size> myStateStack; //!< Stack of previous states
191 //! Defines generic state of order-independent transparency rendering properties.
192 class OpenGl_OitState : public OpenGl_StateInterface
196 //! Creates new uniform state.
197 OpenGl_OitState() : myOitMode (Graphic3d_RTM_BLEND_UNORDERED), myDepthFactor (0.5f) {}
199 //! Sets the uniform values.
200 //! @param theToEnableWrite [in] flag indicating whether color and coverage
201 //! values for OIT processing should be written by shader program.
202 //! @param theDepthFactor [in] scalar factor [0-1] defining influence of depth
203 //! component of a fragment to its final coverage coefficient.
204 void Set (Graphic3d_RenderTransparentMethod theMode,
205 const float theDepthFactor)
208 myDepthFactor = static_cast<float> (Max (0.f, Min (1.f, theDepthFactor)));
211 //! Returns flag indicating whether writing of output for OIT processing
212 //! should be enabled/disabled.
213 Graphic3d_RenderTransparentMethod ActiveMode() const { return myOitMode; }
215 //! Returns factor defining influence of depth component of a fragment
216 //! to its final coverage coefficient.
217 float DepthFactor() const { return myDepthFactor; }
221 Graphic3d_RenderTransparentMethod myOitMode; //!< active OIT method for the main GLSL program
222 float myDepthFactor; //!< factor of depth influence to coverage
225 #endif // _OpenGl_State_HeaderFile