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| * OpenGL is using its own set of variable types to describe its command 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]]. | | * Use the following table to find the respective QB64 [[Variable Types]]. |
| {{FixedStart}}
| |
| +=====================================================================================================================+
| |
| | Numerical types |
| |
| +======================+====================+============================+============================+===============+
| |
| | Type Name | Type suffix symbol | Minimum value | Maximum value | Size in Bytes |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | _BIT | ` | -1 | 0 | 1/8 |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | _BIT * n | `n | -128 | 127 | n/8 |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | _UNSIGNED _BIT | ~` | 0 | 1 | 1/8 |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | _BYTE | %% | -128 | 127 | 1 |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | _UNSIGNED _BYTE | ~%% | 0 | 255 | 1 |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | INTEGER | % | -32,768 | 32,767 | 2 |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | _UNSIGNED INTEGER | ~% | 0 | 65,535 | 2 |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | LONG | & | -2,147,483,648 | 2,147,483,647 | 4 |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | _UNSIGNED LONG | ~& | 0 | 4,294,967,295 | 4 |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | _INTEGER64 | && | -9,223,372,036,854,775,808 | 9,223,372,036,854,775,807 | 8 |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | _UNSIGNED _INTEGER64 | ~&& | 0 | 18,446,744,073,709,551,615 | 8 |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | SINGLE | ! or none | -2.802597E-45 | +3.402823E+38 | 4 |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | DOUBLE | # | -4.490656458412465E-324 | +1.797693134862310E+308 | 8 |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | _FLOAT | ## | -1.18E-4932 | +1.18E+4932 | 32(10 used) |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | _OFFSET | %& | -9,223,372,036,854,775,808 | 9,223,372,036,854,775,807 | use LEN |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | _UNSIGNED _OFFSET | ~%& | 0 | 18,446,744,073,709,551,615 | use LEN |
| |
| +----------------------+--------------------+----------------------------+----------------------------+---------------+
| |
| | _MEM | none | This is an internal TYPE like memory variable. |
| |
| +----------------------+--------------------+-------------------------------------------------------------------------+
| |
| {{FixedEnd}}
| |
| {{TextStart}} | | {{TextStart}} |
| '''OpenGL''' | '''C/C++''' | '''QB64''' | | '''OpenGL''' | '''C/C++''' | '''QB64''' |
The _glAccum statement operates on the accumulation buffer.
Syntax
- _glAccum GLenum op, GLfloat value
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.
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 | 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.
|
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
Navigation:
Main Page with Articles and Tutorials
Keyword Reference - Alphabetical
Keyword Reference - By usage
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