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1 | // Created on: 2013-09-19 |
2 | // Created by: Denis BOGOLEPOV |
3 | // Copyright (c) 2013 OPEN CASCADE SAS |
4 | // |
5 | // The content of this file is subject to the Open CASCADE Technology Public |
6 | // License Version 6.5 (the "License"). You may not use the content of this file |
7 | // except in compliance with the License. Please obtain a copy of the License |
8 | // at http://www.opencascade.org and read it completely before using this file. |
9 | // |
10 | // The Initial Developer of the Original Code is Open CASCADE S.A.S., having its |
11 | // main offices at: 1, place des Freres Montgolfier, 78280 Guyancourt, France. |
12 | // |
13 | // The Original Code and all software distributed under the License is |
14 | // distributed on an "AS IS" basis, without warranty of any kind, and the |
15 | // Initial Developer hereby disclaims all such warranties, including without |
16 | // limitation, any warranties of merchantability, fitness for a particular |
17 | // purpose or non-infringement. Please see the License for the specific terms |
18 | // and conditions governing the rights and limitations under the License. |
19 | |
20 | #include <Graphic3d_ShaderObject.hxx> |
21 | #include <OpenGl_Context.hxx> |
22 | #include <OpenGl_ShaderObject.hxx> |
23 | #include <OSD_Path.hxx> |
24 | #include <Standard_Assert.hxx> |
25 | #include <TCollection_AsciiString.hxx> |
26 | |
27 | IMPLEMENT_STANDARD_HANDLE (OpenGl_ShaderObject, OpenGl_Resource) |
28 | IMPLEMENT_STANDARD_RTTIEXT(OpenGl_ShaderObject, OpenGl_Resource) |
29 | |
30 | // ======================================================================= |
31 | // function : OpenGl_ShaderObject |
32 | // purpose : Creates uninitialized shader object |
33 | // ======================================================================= |
34 | OpenGl_ShaderObject::OpenGl_ShaderObject (GLenum theType) |
35 | : myType (theType), |
36 | myShaderID (NO_SHADER) |
37 | { |
38 | // |
39 | } |
40 | |
41 | // ======================================================================= |
42 | // function : ~OpenGl_ShaderObject |
43 | // purpose : Releases resources of shader object |
44 | // ======================================================================= |
45 | OpenGl_ShaderObject::~OpenGl_ShaderObject() |
46 | { |
47 | Release (NULL); |
48 | } |
49 | |
50 | // ======================================================================= |
51 | // function : LoadSource |
52 | // purpose : Loads shader source code |
53 | // ======================================================================= |
54 | Standard_Boolean OpenGl_ShaderObject::LoadSource (const Handle(OpenGl_Context)& theCtx, |
55 | const TCollection_AsciiString& theSource) |
56 | { |
57 | if (myShaderID == NO_SHADER) |
58 | { |
59 | return Standard_False; |
60 | } |
61 | |
62 | const GLchar* aLines = theSource.ToCString(); |
63 | theCtx->core20->glShaderSource (myShaderID, 1, &aLines, NULL); |
64 | return Standard_True; |
65 | } |
66 | |
67 | // ======================================================================= |
68 | // function : Compile |
69 | // purpose : Compiles the shader object |
70 | // ======================================================================= |
71 | Standard_Boolean OpenGl_ShaderObject::Compile (const Handle(OpenGl_Context)& theCtx) |
72 | { |
73 | if (myShaderID == NO_SHADER) |
74 | { |
75 | return Standard_False; |
76 | } |
77 | |
78 | // Try to compile shader |
79 | theCtx->core20->glCompileShader (myShaderID); |
80 | |
81 | // Check compile status |
82 | GLint aStatus = GL_FALSE; |
83 | theCtx->core20->glGetShaderiv (myShaderID, GL_COMPILE_STATUS, &aStatus); |
84 | return aStatus != GL_FALSE; |
85 | } |
86 | |
87 | // ======================================================================= |
88 | // function : FetchInfoLog |
89 | // purpose : Fetches information log of the last compile operation |
90 | // ======================================================================= |
91 | Standard_Boolean OpenGl_ShaderObject::FetchInfoLog (const Handle(OpenGl_Context)& theCtx, |
92 | TCollection_AsciiString& theLog) |
93 | { |
94 | if (myShaderID == NO_SHADER) |
95 | { |
96 | return Standard_False; |
97 | } |
98 | |
99 | // Load information log of the compiler |
100 | GLint aLength = 0; |
101 | theCtx->core20->glGetShaderiv (myShaderID, GL_INFO_LOG_LENGTH, &aLength); |
102 | if (aLength > 0) |
103 | { |
104 | GLchar* aLog = (GLchar*) alloca (aLength); |
105 | memset (aLog, 0, aLength); |
106 | theCtx->core20->glGetShaderInfoLog (myShaderID, aLength, NULL, aLog); |
107 | theLog = aLog; |
108 | } |
109 | |
110 | return Standard_True; |
111 | } |
112 | |
113 | // ======================================================================= |
114 | // function : Create |
115 | // purpose : Creates new empty shader object of specified type |
116 | // ======================================================================= |
117 | Standard_Boolean OpenGl_ShaderObject::Create (const Handle(OpenGl_Context)& theCtx) |
118 | { |
119 | if (myShaderID == NO_SHADER |
120 | && theCtx->core20 != NULL) |
121 | { |
122 | myShaderID = theCtx->core20->glCreateShader (myType); |
123 | } |
124 | |
125 | return myShaderID != NO_SHADER; |
126 | } |
127 | |
128 | // ======================================================================= |
129 | // function : Release |
130 | // purpose : Destroys shader object |
131 | // ======================================================================= |
132 | void OpenGl_ShaderObject::Release (const OpenGl_Context* theCtx) |
133 | { |
134 | if (myShaderID == NO_SHADER) |
135 | { |
136 | return; |
137 | } |
138 | |
139 | Standard_ASSERT_RETURN (theCtx != NULL, |
140 | "OpenGl_ShaderObject destroyed without GL context! Possible GPU memory leakage...",); |
141 | |
142 | if (theCtx->core20 != NULL) |
143 | { |
144 | theCtx->core20->glDeleteShader (myShaderID); |
145 | } |
146 | myShaderID = NO_SHADER; |
147 | } |