GlDeleteTextures: Difference between revisions

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(Created page with "'''_glDeleteTextures:''' delete named textures {{PageSyntax}} : SUB _glDeleteTextures (BYVAL n AS LONG, textures AS _UNSIGNED LONG) : void '''_glDeleteTextures'''(GLsizei {{Parameter|n}}, const GLuint * {{Parameter|textures}}); ; n : Specifies the number of textures to be deleted. ; textures : Specifies an array of textures to be deleted. {{PageDescription}} '''_glDeleteTextures''' deletes {{Parameter|n}} textures named by the elements of the array {{Parameter...")
 
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'''_glDeleteTextures:''' delete named textures
{{DISPLAYTITLE:_glDeleteTextures}}
The '''_glDeleteTextures''' statement deletes named textures.




{{PageSyntax}}
{{PageSyntax}}
: [[_glDeleteTextures]] GLsizei {{Parameter|n}}, const GLuint {{Parameter|*textures}}


:  SUB _glDeleteTextures (BYVAL n AS LONG, textures AS _UNSIGNED LONG)


:  void '''_glDeleteTextures'''(GLsizei {{Parameter|n}}, const GLuint * {{Parameter|textures}});
{{PageParameters}}
 
* 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]].
; n
{{OpenGLTypesPlugin}}
: Specifies the number of textures to be deleted.
; textures
: Specifies an array of textures to be deleted.




{{PageDescription}}
{{PageDescription}}
 
* OpenGL's documentation is available in several places, so we won't reproduce it here for another time.
'''_glDeleteTextures''' deletes {{Parameter|n}} textures named by the elements of the array {{Parameter|textures}}. After a texture is deleted, it has no contents or dimensionality, and its name is free for reuse (for example by {{KW|_glGenTextures}}). If a texture that is currently bound is deleted, the binding reverts to 0 (the default texture).
* The full description for this command can be found at [https://learn.microsoft.com/en-us/windows/win32/opengl/gldeletetextures Microsoft Docs] and is also valid for QB64 usage.
 
'''_glDeleteTextures''' silently ignores 0's and names that do not correspond to existing textures.
 
 
{{PageErrors}}
 
{{KW|_GL_INVALID_VALUE}} is generated if {{Parameter|n}} is negative.
 
 
{{PageUseWith}}
 
{{KW|_glIsTexture}}




{{PageSeeAlso}}
{{PageSeeAlso}}
 
* [[_GL|SUB _GL]]
[[_GL|SUB _GL]]
* [[_glAreTexturesResident]], [[_glBegin]], [[_glBindTexture]], [[_glEnd]]
{{KW|_glBindTexture}}, {{KW|_glGenTextures}}, {{KW|_glIsTexture}}
* [[_glGenTextures]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glgetbooleanv--glgetdoublev--glgetfloatv--glgetintegerv _glGet], [https://learn.microsoft.com/en-us/windows/win32/opengl/glgettexparameter _glGetTexParameter], [[_glIsTexture]]
* [[_glPrioritizeTextures]], [https://learn.microsoft.com/en-us/windows/win32/opengl/gltexgen-functions _glTexGen], [[_glTexImage1D]], [[_glTexImage2D]]
* [https://learn.microsoft.com/en-us/windows/win32/opengl/gltexparameter-functions _glTexParameter]




{{PageCopyright}}
{{PageNavigation}}

Latest revision as of 00:48, 28 January 2023

The _glDeleteTextures statement deletes named textures.


Syntax

_glDeleteTextures GLsizei n, const GLuint *textures


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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