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39 
40 #ifndef QOPENGLVERTEXARRAYOBJECT_P_H
41 #define QOPENGLVERTEXARRAYOBJECT_P_H
42 
43 //
44 //  W A R N I N G
45 //  -------------
46 //
47 // This file is not part of the Qt API.  It exists for the convenience
48 // of the Qt OpenGL classes.  This header file may change from
49 // version to version without notice, or even be removed.
50 //
51 // We mean it.
52 //
53 
54 #include <QtCore/qglobal.h>
55 
56 #ifndef QT_NO_OPENGL
57 
58 #include <QtGui/qopengl.h>
59 
60 QT_BEGIN_NAMESPACE
61 
62 class QOpenGLVertexArrayObjectHelper;
63 class QOpenGLContext;
64 
65 void Q_GUI_EXPORT qtInitializeVertexArrayObjectHelper(QOpenGLVertexArrayObjectHelper *helper, QOpenGLContext *context);
66 
67 class QOpenGLVertexArrayObjectHelper
68 {
Q_DISABLE_COPY(QOpenGLVertexArrayObjectHelper)69     Q_DISABLE_COPY(QOpenGLVertexArrayObjectHelper)
70 
71 public:
72     explicit inline QOpenGLVertexArrayObjectHelper(QOpenGLContext *context)
73         : GenVertexArrays(nullptr)
74         , DeleteVertexArrays(nullptr)
75         , BindVertexArray(nullptr)
76         , IsVertexArray(nullptr)
77     {
78         qtInitializeVertexArrayObjectHelper(this, context);
79     }
80 
isValid()81     inline bool isValid() const
82     {
83         return GenVertexArrays && DeleteVertexArrays && BindVertexArray && IsVertexArray;
84     }
85 
glGenVertexArrays(GLsizei n,GLuint * arrays)86     inline void glGenVertexArrays(GLsizei n, GLuint *arrays) const
87     {
88         GenVertexArrays(n, arrays);
89     }
90 
glDeleteVertexArrays(GLsizei n,const GLuint * arrays)91     inline void glDeleteVertexArrays(GLsizei n, const GLuint *arrays) const
92     {
93         DeleteVertexArrays(n, arrays);
94     }
95 
glBindVertexArray(GLuint array)96     inline void glBindVertexArray(GLuint array) const
97     {
98         BindVertexArray(array);
99     }
100 
glIsVertexArray(GLuint array)101     inline GLboolean glIsVertexArray(GLuint array) const
102     {
103         return IsVertexArray(array);
104     }
105 
106 private:
107     friend void Q_GUI_EXPORT qtInitializeVertexArrayObjectHelper(QOpenGLVertexArrayObjectHelper *helper, QOpenGLContext *context);
108 
109     // Function signatures are equivalent between desktop core, ARB, APPLE, ES 3 and ES 2 extensions
110     typedef void (QOPENGLF_APIENTRYP qt_GenVertexArrays_t)(GLsizei n, GLuint *arrays);
111     typedef void (QOPENGLF_APIENTRYP qt_DeleteVertexArrays_t)(GLsizei n, const GLuint *arrays);
112     typedef void (QOPENGLF_APIENTRYP qt_BindVertexArray_t)(GLuint array);
113     typedef GLboolean (QOPENGLF_APIENTRYP qt_IsVertexArray_t)(GLuint array);
114 
115     qt_GenVertexArrays_t GenVertexArrays;
116     qt_DeleteVertexArrays_t DeleteVertexArrays;
117     qt_BindVertexArray_t BindVertexArray;
118     qt_IsVertexArray_t IsVertexArray;
119 };
120 
121 QT_END_NAMESPACE
122 
123 #endif // QT_NO_OPENGL
124 
125 #endif // QOPENGLVERTEXARRAYOBJECT_P_H
126