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1 | // Created on: 2013-09-19 |
2 | // Created by: Denis BOGOLEPOV |
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3 | // Copyright (c) 2013-2014 OPEN CASCADE SAS |
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4 | // |
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5 | // This file is part of Open CASCADE Technology software library. |
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6 | // |
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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 |
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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. |
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12 | // |
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13 | // Alternatively, this file may be used under the terms of Open CASCADE |
14 | // commercial license or contractual agreement. |
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15 | |
16 | #include <Graphic3d_ShaderObject.hxx> |
17 | #include <OpenGl_Context.hxx> |
18 | #include <OpenGl_ShaderObject.hxx> |
19 | #include <OSD_Path.hxx> |
20 | #include <Standard_Assert.hxx> |
21 | #include <TCollection_AsciiString.hxx> |
22 | |
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23 | #ifdef _WIN32 |
24 | #include <malloc.h> // for alloca() |
25 | #endif |
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26 | |
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27 | IMPLEMENT_STANDARD_RTTIEXT(OpenGl_ShaderObject,OpenGl_Resource) |
28 | |
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29 | // ======================================================================= |
30 | // function : OpenGl_ShaderObject |
31 | // purpose : Creates uninitialized shader object |
32 | // ======================================================================= |
33 | OpenGl_ShaderObject::OpenGl_ShaderObject (GLenum theType) |
34 | : myType (theType), |
35 | myShaderID (NO_SHADER) |
36 | { |
37 | // |
38 | } |
39 | |
40 | // ======================================================================= |
41 | // function : ~OpenGl_ShaderObject |
42 | // purpose : Releases resources of shader object |
43 | // ======================================================================= |
44 | OpenGl_ShaderObject::~OpenGl_ShaderObject() |
45 | { |
46 | Release (NULL); |
47 | } |
48 | |
49 | // ======================================================================= |
50 | // function : LoadSource |
51 | // purpose : Loads shader source code |
52 | // ======================================================================= |
53 | Standard_Boolean OpenGl_ShaderObject::LoadSource (const Handle(OpenGl_Context)& theCtx, |
54 | const TCollection_AsciiString& theSource) |
55 | { |
56 | if (myShaderID == NO_SHADER) |
57 | { |
58 | return Standard_False; |
59 | } |
60 | |
61 | const GLchar* aLines = theSource.ToCString(); |
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62 | theCtx->core20fwd->glShaderSource (myShaderID, 1, &aLines, NULL); |
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63 | return Standard_True; |
64 | } |
65 | |
66 | // ======================================================================= |
67 | // function : Compile |
68 | // purpose : Compiles the shader object |
69 | // ======================================================================= |
70 | Standard_Boolean OpenGl_ShaderObject::Compile (const Handle(OpenGl_Context)& theCtx) |
71 | { |
72 | if (myShaderID == NO_SHADER) |
73 | { |
74 | return Standard_False; |
75 | } |
76 | |
77 | // Try to compile shader |
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78 | theCtx->core20fwd->glCompileShader (myShaderID); |
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79 | |
80 | // Check compile status |
81 | GLint aStatus = GL_FALSE; |
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82 | theCtx->core20fwd->glGetShaderiv (myShaderID, GL_COMPILE_STATUS, &aStatus); |
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83 | return aStatus != GL_FALSE; |
84 | } |
85 | |
86 | // ======================================================================= |
87 | // function : FetchInfoLog |
88 | // purpose : Fetches information log of the last compile operation |
89 | // ======================================================================= |
90 | Standard_Boolean OpenGl_ShaderObject::FetchInfoLog (const Handle(OpenGl_Context)& theCtx, |
91 | TCollection_AsciiString& theLog) |
92 | { |
93 | if (myShaderID == NO_SHADER) |
94 | { |
95 | return Standard_False; |
96 | } |
97 | |
98 | // Load information log of the compiler |
99 | GLint aLength = 0; |
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100 | theCtx->core20fwd->glGetShaderiv (myShaderID, GL_INFO_LOG_LENGTH, &aLength); |
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101 | if (aLength > 0) |
102 | { |
103 | GLchar* aLog = (GLchar*) alloca (aLength); |
104 | memset (aLog, 0, aLength); |
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105 | theCtx->core20fwd->glGetShaderInfoLog (myShaderID, aLength, NULL, aLog); |
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106 | theLog = aLog; |
107 | } |
108 | |
109 | return Standard_True; |
110 | } |
111 | |
112 | // ======================================================================= |
113 | // function : Create |
114 | // purpose : Creates new empty shader object of specified type |
115 | // ======================================================================= |
116 | Standard_Boolean OpenGl_ShaderObject::Create (const Handle(OpenGl_Context)& theCtx) |
117 | { |
118 | if (myShaderID == NO_SHADER |
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119 | && theCtx->core20fwd != NULL) |
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120 | { |
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121 | myShaderID = theCtx->core20fwd->glCreateShader (myType); |
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122 | } |
123 | |
124 | return myShaderID != NO_SHADER; |
125 | } |
126 | |
127 | // ======================================================================= |
128 | // function : Release |
129 | // purpose : Destroys shader object |
130 | // ======================================================================= |
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131 | void OpenGl_ShaderObject::Release (OpenGl_Context* theCtx) |
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132 | { |
133 | if (myShaderID == NO_SHADER) |
134 | { |
135 | return; |
136 | } |
137 | |
138 | Standard_ASSERT_RETURN (theCtx != NULL, |
139 | "OpenGl_ShaderObject destroyed without GL context! Possible GPU memory leakage...",); |
140 | |
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141 | if (theCtx->core20fwd != NULL |
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142 | && theCtx->IsValid()) |
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143 | { |
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144 | theCtx->core20fwd->glDeleteShader (myShaderID); |
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145 | } |
146 | myShaderID = NO_SHADER; |
147 | } |