1 // Created on: 2013-09-20
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 #include <Graphic3d_ShaderProgram.hxx>
18 #include <Graphic3d_GraphicDriver.hxx>
19 #include <Graphic3d_ShaderObject.hxx>
20 #include <OSD_Directory.hxx>
21 #include <OSD_Environment.hxx>
22 #include <OSD_File.hxx>
23 #include <OSD_Path.hxx>
24 #include <Standard_Atomic.hxx>
26 IMPLEMENT_STANDARD_RTTIEXT(Graphic3d_ShaderProgram,Standard_Transient)
30 static volatile Standard_Integer THE_PROGRAM_OBJECT_COUNTER = 0;
33 // =======================================================================
34 // function : ShadersFolder
36 // =======================================================================
37 const TCollection_AsciiString& Graphic3d_ShaderProgram::ShadersFolder()
39 static Standard_Boolean THE_IS_DEFINED = Standard_False;
40 static TCollection_AsciiString THE_SHADERS_FOLDER;
43 THE_IS_DEFINED = Standard_True;
44 OSD_Environment aDirEnv ("CSF_ShadersDirectory");
45 THE_SHADERS_FOLDER = aDirEnv.Value();
46 if (THE_SHADERS_FOLDER.IsEmpty())
48 OSD_Environment aCasRootEnv ("CASROOT");
49 THE_SHADERS_FOLDER = aCasRootEnv.Value();
50 if (!THE_SHADERS_FOLDER.IsEmpty())
52 THE_SHADERS_FOLDER += "/src/Shaders";
56 if (THE_SHADERS_FOLDER.IsEmpty())
58 return THE_SHADERS_FOLDER;
61 const OSD_Path aDirPath (THE_SHADERS_FOLDER);
62 OSD_Directory aDir (aDirPath);
63 const TCollection_AsciiString aProgram = THE_SHADERS_FOLDER + "/Declarations.glsl";
64 OSD_File aProgramFile (aProgram);
66 || !aProgramFile.Exists())
68 std::cerr << "Standard GLSL programs are not found in: " << THE_SHADERS_FOLDER.ToCString() << std::endl;
69 throw Standard_Failure("CSF_ShadersDirectory or CASROOT is set incorrectly");
72 return THE_SHADERS_FOLDER;
75 // =======================================================================
76 // function : Graphic3d_ShaderProgram
77 // purpose : Creates new empty program object
78 // =======================================================================
79 Graphic3d_ShaderProgram::Graphic3d_ShaderProgram()
80 : myNbLightsMax (THE_MAX_LIGHTS_DEFAULT),
81 myNbClipPlanesMax (THE_MAX_CLIP_PLANES_DEFAULT),
82 myNbFragOutputs (THE_NB_FRAG_OUTPUTS),
83 myHasWeightOitOutput (false)
85 myID = TCollection_AsciiString ("Graphic3d_ShaderProgram_")
86 + TCollection_AsciiString (Standard_Atomic_Increment (&THE_PROGRAM_OBJECT_COUNTER));
89 // =======================================================================
90 // function : ~Graphic3d_ShaderProgram
91 // purpose : Releases resources of program object
92 // =======================================================================
93 Graphic3d_ShaderProgram::~Graphic3d_ShaderProgram()
98 // =======================================================================
100 // purpose : Checks if the program object is valid or not
101 // =======================================================================
102 Standard_Boolean Graphic3d_ShaderProgram::IsDone() const
104 if (myShaderObjects.IsEmpty())
106 return Standard_False;
109 for (Graphic3d_ShaderObjectList::Iterator anIt (myShaderObjects); anIt.More(); anIt.Next())
111 if (!anIt.Value()->IsDone())
112 return Standard_False;
115 return Standard_True;
118 // =======================================================================
119 // function : AttachShader
120 // purpose : Attaches shader object to the program object
121 // =======================================================================
122 Standard_Boolean Graphic3d_ShaderProgram::AttachShader (const Handle(Graphic3d_ShaderObject)& theShader)
124 if (theShader.IsNull())
126 return Standard_False;
129 for (Graphic3d_ShaderObjectList::Iterator anIt (myShaderObjects); anIt.More(); anIt.Next())
131 if (anIt.Value() == theShader)
132 return Standard_False;
135 myShaderObjects.Append (theShader);
136 return Standard_True;
139 // =======================================================================
140 // function : DetachShader
141 // purpose : Detaches shader object from the program object
142 // =======================================================================
143 Standard_Boolean Graphic3d_ShaderProgram::DetachShader (const Handle(Graphic3d_ShaderObject)& theShader)
145 if (theShader.IsNull())
147 return Standard_False;
150 for (Graphic3d_ShaderObjectList::Iterator anIt (myShaderObjects); anIt.More(); anIt.Next())
152 if (anIt.Value() == theShader)
154 myShaderObjects.Remove (anIt);
155 return Standard_True;
159 return Standard_False;
162 // =======================================================================
163 // function : ClearVariables
164 // purpose : Removes all custom uniform variables from the program
165 // =======================================================================
166 void Graphic3d_ShaderProgram::ClearVariables()
171 // =======================================================================
172 // function : SetAttributes
174 // =======================================================================
175 void Graphic3d_ShaderProgram::SetVertexAttributes (const Graphic3d_ShaderAttributeList& theAttributes)
177 myAttributes = theAttributes;