GlClearDepth: Difference between revisions

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(Created page with "'''_glClearDepth:''' specify the clear value for the depth buffer {{PageSyntax}} :: SUB _glClearDepth (BYVAL depth AS DOUBLE) :: void '''_glClearDepth'''(GLdouble {{Parameter|depth}}); :: void '''_glClearDepthf'''(GLfloat {{Parameter|depth}}); ; depth : Specifies the depth value used when the depth buffer is cleared. The initial value is 1. {{PageDescription}} '''_glClearDepth''' specifies the depth value used by {{KW|_glClear}} to clear the depth buffer. Values s...")
 
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'''_glClearDepth:''' specify the clear value for the depth buffer
{{DISPLAYTITLE:_glClearDepth}}
The '''_glClearDepth''' statement specifies the clear value for the depth buffer.




{{PageSyntax}}
{{PageSyntax}}
: [[_glClearDepth]] GLclampd {{Parameter|depth}}


:: SUB _glClearDepth (BYVAL depth AS DOUBLE)
:: void '''_glClearDepth'''(GLdouble {{Parameter|depth}});
:: void '''_glClearDepthf'''(GLfloat {{Parameter|depth}});


; depth
{{PageParameters}}
: Specifies the depth value used when the depth buffer is cleared. The initial value is 1.
* 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]].
{{OpenGLTypesPlugin}}




{{PageDescription}}
{{PageDescription}}
* 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 [https://learn.microsoft.com/en-us/windows/win32/opengl/glcleardepth Microsoft Docs] and is also valid for QB64 usage.


'''_glClearDepth''' specifies the depth value used by {{KW|_glClear}} to clear the depth buffer. Values specified by '''_glClearDepth''' are clamped to the range [0, 1].
{{PageNotes}}
The type of the {{Parameter|depth}} parameter was changed from GLclampf to GLfloat for '''_glClearDepthf''' and from GLclampd to GLdouble for '''_glClearDepth'''. This change is transparent to user code.
{{PageUseWith}}
{{KW|_glGet}} with argument {{KW|_GL_DEPTH_CLEAR_VALUE}}


{{PageSeeAlso}}
{{PageSeeAlso}}
 
* [[_GL|SUB _GL]]
[[_GL|SUB _GL]]
* [[_glBegin]], [[_glClear]], [[_glEnd]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glgetbooleanv--glgetdoublev--glgetfloatv--glgetintegerv _glGet]
{{KW|_glClear}}




{{PageCopyright}}
{{PageNavigation}}

Latest revision as of 00:37, 28 January 2023

The _glClearDepth statement specifies the clear value for the depth buffer.


Syntax

_glClearDepth GLclampd depth


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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