0022819: Redesign of OpenGl driver
[occt.git] / src / OpenGl / OpenGl_Context.cxx
CommitLineData
2166f0fa
SK
1// File: OpenGl_Context.cxx
2// Created: 26 January 2012
3// Author: Kirill GAVRILOV
4// Copyright: OPEN CASCADE 2012
5
6#include <OpenGl_Context.hxx>
7
8IMPLEMENT_STANDARD_HANDLE (OpenGl_Context, Standard_Transient)
9IMPLEMENT_STANDARD_RTTIEXT(OpenGl_Context, Standard_Transient)
10
11#if (!defined(_WIN32) && !defined(__WIN32__))
12 #include <GL/glx.h>
13#endif
14
15// =======================================================================
16// function : OpenGl_Context
17// purpose :
18// =======================================================================
19OpenGl_Context::OpenGl_Context()
20: arbVBO (NULL),
21 extFBO (NULL)
22{
23 //
24}
25
26// =======================================================================
27// function : ~OpenGl_Context
28// purpose :
29// =======================================================================
30OpenGl_Context::~OpenGl_Context()
31{
32 //
33}
34
35// =======================================================================
36// function : CheckExtension
37// purpose :
38// =======================================================================
39Standard_Boolean OpenGl_Context::CheckExtension (const char* theExtName,
40 const char* theExtString)
41{
42 if (theExtName == NULL
43 || theExtString == NULL) {
44 std::cerr << "CheckExtension called with NULL string! No GL context?\n";
45 return Standard_False;
46 }
47
48 // Search for theExtName in the extensions string.
49 // Use of strstr() is not sufficient because extension names can be prefixes of other extension names.
50 char* aPtrIter = (char* )theExtString;
51 int anExtNameLen = strlen(theExtName);
52 const char* aPtrEnd = aPtrIter + strlen(theExtString);
53
54 while (aPtrIter < aPtrEnd)
55 {
56 int n = strcspn (aPtrIter, " ");
57 if ((n == anExtNameLen) && (strncmp (theExtName, aPtrIter, n) == 0))
58 return Standard_True;
59
60 aPtrIter += (n + 1);
61 }
62 return Standard_False;
63}
64
65// =======================================================================
66// function : Init
67// purpose :
68// =======================================================================
69void OpenGl_Context::Init()
70{
71 const char* anExtString = (const char* )glGetString (GL_EXTENSIONS);
72 if (CheckExtension ("GL_ARB_vertex_buffer_object", anExtString))
73 {
74 arbVBO = new OpenGl_ArbVBO();
75 memset(arbVBO, 0, sizeof(OpenGl_ArbVBO)); // nullify whole structure for safety
76 if (!FindProc ("glGenBuffersARB", arbVBO->glGenBuffersARB)
77 || !FindProc ("glBindBufferARB", arbVBO->glBindBufferARB)
78 || !FindProc ("glBufferDataARB", arbVBO->glBufferDataARB)
79 || !FindProc ("glDeleteBuffersARB", arbVBO->glDeleteBuffersARB))
80 {
81 delete arbVBO;
82 arbVBO = NULL;
83 }
84 }
85
86 if (CheckExtension ("GL_EXT_framebuffer_object", anExtString))
87 {
88 extFBO = new OpenGl_ExtFBO();
89 memset(extFBO, 0, sizeof(OpenGl_ExtFBO)); // nullify whole structure for safety
90 if (!FindProc ("glGenFramebuffersEXT", extFBO->glGenFramebuffersEXT)
91 || !FindProc ("glDeleteFramebuffersEXT", extFBO->glDeleteFramebuffersEXT)
92 || !FindProc ("glBindFramebufferEXT", extFBO->glBindFramebufferEXT)
93 || !FindProc ("glFramebufferTexture2DEXT", extFBO->glFramebufferTexture2DEXT)
94 || !FindProc ("glCheckFramebufferStatusEXT", extFBO->glCheckFramebufferStatusEXT)
95 || !FindProc ("glGenRenderbuffersEXT", extFBO->glGenRenderbuffersEXT)
96 || !FindProc ("glDeleteRenderbuffersEXT", extFBO->glDeleteRenderbuffersEXT)
97 || !FindProc ("glBindRenderbufferEXT", extFBO->glBindRenderbufferEXT)
98 || !FindProc ("glRenderbufferStorageEXT", extFBO->glRenderbufferStorageEXT)
99 || !FindProc ("glFramebufferRenderbufferEXT", extFBO->glFramebufferRenderbufferEXT))
100 {
101 delete extFBO;
102 extFBO = NULL;
103 }
104 }
105}