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* [[_GL|SUB _GL]]
* [[_GL|SUB _GL]]
* [[_glCallList]], [[_glCallLists]], [https://docs.microsoft.com/en-us/windows/win32/opengl/glcolor-functions _glColor], [https://docs.microsoft.com/en-us/windows/win32/opengl/gledgeflag-functions _glEdgeFlag]
* [[_glCallList]], [[_glCallLists]], [https://docs.microsoft.com/en-us/windows/win32/opengl/glcolor-functions _glColor], [https://docs.microsoft.com/en-us/windows/win32/opengl/gledgeflag-functions _glEdgeFlag]
* [https://docs.microsoft.com/en-us/windows/win32/opengl/glend _glEnd], [https://docs.microsoft.com/en-us/windows/win32/opengl/glevalcoord-functions _glEvalCoord], [https://docs.microsoft.com/en-us/windows/win32/opengl/glevalpoint _glEvalPoint], [https://docs.microsoft.com/en-us/windows/win32/opengl/glindex-functions _glIndex]
* [[_glEnd]], [https://docs.microsoft.com/en-us/windows/win32/opengl/glevalcoord-functions _glEvalCoord], [https://docs.microsoft.com/en-us/windows/win32/opengl/glevalpoint _glEvalPoint], [https://docs.microsoft.com/en-us/windows/win32/opengl/glindex-functions _glIndex]
* [https://docs.microsoft.com/en-us/windows/win32/opengl/glmaterial-functions _glMaterial], [https://docs.microsoft.com/en-us/windows/win32/opengl/glnormal-functions _glNormal], [https://docs.microsoft.com/en-us/windows/win32/opengl/gltexcoord-functions _glTexCoord], [https://docs.microsoft.com/en-us/windows/win32/opengl/glvertex-functions _glVertex]
* [https://docs.microsoft.com/en-us/windows/win32/opengl/glmaterial-functions _glMaterial], [https://docs.microsoft.com/en-us/windows/win32/opengl/glnormal-functions _glNormal], [https://docs.microsoft.com/en-us/windows/win32/opengl/gltexcoord-functions _glTexCoord], [https://docs.microsoft.com/en-us/windows/win32/opengl/glvertex-functions _glVertex]


Revision as of 16:15, 23 July 2022

The _glBegin and _glEnd statements delimit the vertices of a primitive or a group of like primitives.


Syntax

_glBegin GLenum mode


Parameters

  • OpenGL is using its own set of variable types to describe its command parameters.
  • Use the following table to find the respective QB64 Variable Types.
   Table 2: Relations between the OpenGL variable types vs. C/C++ and QB64.
 ┌──────────────┬────────────────┬──────────────────────────────────────────┐
 │    OpenGL    │     C/C++      │     QB64                                 │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLenum       │ unsigned int   │ _UNSIGNED LONG                           │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLboolean    │ unsigned char  │ _UNSIGNED _BYTE                          │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLbitfield   │ unsigned int   │ _UNSIGNED LONG                           │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLbyte       │ signed char    │ _BYTE                                    │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLshort      │ short          │ INTEGER                                  │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLint        │ int            │ LONG                                     │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLsizei      │ int            │ LONG                                     │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLubyte      │ unsigned char  │ _UNSIGNED _BYTE                          │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLushort     │ unsigned short │ _UNSIGNED INTEGER                        │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLuint       │ unsigned int   │ _UNSIGNED LONG                           │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLfloat      │ float          │ SINGLE                                   │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLclampf     │ float          │ SINGLE                                   │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLdouble     │ double         │ DOUBLE                                   │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLclampd     │ double         │ DOUBLE                                   │
 ├──────────────┼────────────────┼──────────────────────────────────────────┤
 │ GLvoid   (1) │ void           │ _OFFSET(any fixed lenght string or _BYTE │
 │              │                │         array element)                   │
 └──────────────┴────────────────┴──────────────────────────────────────────┘
 Note: If a parameter has an asterisk (*) in front, then it's a pointer to
       the designated OpenGL variable type, rather than a value of that type.
       Those must be passed using the _OFFSET(...) notation.

 E.g.  GLuint *anyParam is actually the offset of a _UNSIGNED LONG (~&)
       variable or array, which must be passed as _OFFSET(anyVar~&) or
       _OFFSET(anyArr~&()) respectively.

  (1)  This type is regularly only used for pointers (with asterisk (*)) to
       any byte sized memory data, hence _BYTE or fixed length strings.


Description

  • OpenGL's documentation is available in several places, so we won't reproduce it here for another time.
  • The full description for this command can be found at Microsoft Docs and is also valid for QB64 usage.


See also


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