GlGetFloatv: Difference between revisions

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(Created page with "{{DISPLAYTITLE:_glGetFloatv}} The '''_glGetFloatv''' statement returns the value or values of a selected parameter. {{PageSyntax}} : '''_glGetFloatv''' GLenum {{Parameter|pname}}, GLfloat {{Parameter|*params}} {{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. {{OpenGLTypesPlugin}} {{PageDescription}} * OpenGL's documentation is available in...")
 
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{{PageSyntax}}
{{PageSyntax}}
: '''_glGetFloatv''' GLenum {{Parameter|pname}}, GLfloat {{Parameter|*params}}
: [[_glGetFloatv]] GLenum {{Parameter|pname}}, GLfloat {{Parameter|*params}}




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{{PageDescription}}
{{PageDescription}}
* OpenGL's documentation is available in several places, so we won't reproduce it here for another time.
* 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://docs.microsoft.com/en-us/windows/win32/opengl/glgetfloatv Microsoft Docs] and is also valid for QB64 usage.
* The full description for this command can be found at [https://learn.microsoft.com/en-us/windows/win32/opengl/glgetfloatv Microsoft Docs] and is also valid for QB64 usage.




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* [[_glAccum]], [[_glAlphaFunc]], [[_glBegin]], [[_glBlendFunc]]
* [[_glAccum]], [[_glAlphaFunc]], [[_glBegin]], [[_glBlendFunc]]
* [[_glCallList]], [[_glClearAccum]], [[_glClearColor]], [[_glClearDepth]]
* [[_glCallList]], [[_glClearAccum]], [[_glClearColor]], [[_glClearDepth]]
* [[_glClearIndex]], [[_glClearStencil]], [[_glClipPlane]], [https://docs.microsoft.com/en-us/windows/win32/opengl/glcolor-functions _glColor]
* [[_glClearIndex]], [[_glClearStencil]], [[_glClipPlane]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glcolor-functions _glColor]
* [[_glColorMask]], [[_glColorMaterial]], [[_glCullFace]], [[_glDepthFunc]]
* [[_glColorMask]], [[_glColorMaterial]], [[_glCullFace]], [[_glDepthFunc]]
* [[_glDepthMask]], [[_glDepthRange]], [[_glDrawBuffer]], [https://docs.microsoft.com/en-us/windows/win32/opengl/gledgeflag-functions _glEdgeFlag]
* [[_glDepthMask]], [[_glDepthRange]], [[_glDrawBuffer]], [https://learn.microsoft.com/en-us/windows/win32/opengl/gledgeflag-functions _glEdgeFlag]
* [[_glEnd]], [https://docs.microsoft.com/en-us/windows/win32/opengl/glfog _glFog], [[_glFrontFace]], [[_glGetClipPlane]]
* [[_glEnd]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glfog _glFog], [[_glFrontFace]], [[_glGetClipPlane]]
* [[_glGetError]], [https://docs.microsoft.com/en-us/windows/win32/opengl/glgetlight _glGetLight], [https://docs.microsoft.com/en-us/windows/win32/opengl/glgetmap _glGetMap], [https://docs.microsoft.com/en-us/windows/win32/opengl/glgetmaterial _glGetMaterial]
* [[_glGetError]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glgetlight _glGetLight], [https://learn.microsoft.com/en-us/windows/win32/opengl/glgetmap _glGetMap], [https://learn.microsoft.com/en-us/windows/win32/opengl/glgetmaterial _glGetMaterial]
* [https://docs.microsoft.com/en-us/windows/win32/opengl/glgetpixelmap _glGetPixelMap], [[_glGetPolygonStipple]], [[_glGetString]], [https://docs.microsoft.com/en-us/windows/win32/opengl/glgettexenv _glGetTexEnv]
* [https://learn.microsoft.com/en-us/windows/win32/opengl/glgetpixelmap _glGetPixelMap], [[_glGetPolygonStipple]], [[_glGetString]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glgettexenv _glGetTexEnv]
* [https://docs.microsoft.com/en-us/windows/win32/opengl/glgettexgen _glGetTexGen], [[_glGetTexImage]], [https://docs.microsoft.com/en-us/windows/win32/opengl/glgettexlevelparameter _glGetTexLevelParameter], [https://docs.microsoft.com/en-us/windows/win32/opengl/glgettexparameter _glGetTexParameter]
* [https://learn.microsoft.com/en-us/windows/win32/opengl/glgettexgen _glGetTexGen], [[_glGetTexImage]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glgettexlevelparameter _glGetTexLevelParameter], [https://learn.microsoft.com/en-us/windows/win32/opengl/glgettexparameter _glGetTexParameter]
* [[_glHint]], [https://docs.microsoft.com/en-us/windows/win32/opengl/glindex-functions _glIndex], [[_glIndexMask]], [[_glIsEnabled]]
* [[_glHint]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glindex-functions _glIndex], [[_glIndexMask]], [[_glIsEnabled]]
* [https://docs.microsoft.com/en-us/windows/win32/opengl/gllight-functions _glLight], [https://docs.microsoft.com/en-us/windows/win32/opengl/gllightmodel-functions _glLightModel], [[_glLineStipple]], [[_glLineWidth]]
* [https://learn.microsoft.com/en-us/windows/win32/opengl/gllight-functions _glLight], [https://learn.microsoft.com/en-us/windows/win32/opengl/gllightmodel-functions _glLightModel], [[_glLineStipple]], [[_glLineWidth]]
* [[_glListBase]], [[_glLogicOp]], [https://docs.microsoft.com/en-us/windows/win32/opengl/glmap1 _glMap1], [https://docs.microsoft.com/en-us/windows/win32/opengl/glmap2 _glMap2]
* [[_glListBase]], [[_glLogicOp]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glmap1 _glMap1], [https://learn.microsoft.com/en-us/windows/win32/opengl/glmap2 _glMap2]
* [https://docs.microsoft.com/en-us/windows/win32/opengl/glmapgrid-functions _glMapGrid], [[_glMatrixMode]], [[_glNewList]], [https://docs.microsoft.com/en-us/windows/win32/opengl/glnormal-functions _glNormal]
* [https://learn.microsoft.com/en-us/windows/win32/opengl/glmapgrid-functions _glMapGrid], [[_glMatrixMode]], [[_glNewList]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glnormal-functions _glNormal]
* [https://docs.microsoft.com/en-us/windows/win32/opengl/glpixelmap _glPixelMap], [https://docs.microsoft.com/en-us/windows/win32/opengl/glpixelstore-functions _glPixelStore], [https://docs.microsoft.com/en-us/windows/win32/opengl/glpixeltransfer _glPixelTransfer], [[_glPixelZoom]]
* [https://learn.microsoft.com/en-us/windows/win32/opengl/glpixelmap _glPixelMap], [https://learn.microsoft.com/en-us/windows/win32/opengl/glpixelstore-functions _glPixelStore], [https://learn.microsoft.com/en-us/windows/win32/opengl/glpixeltransfer _glPixelTransfer], [[_glPixelZoom]]
* [[_glPointSize]], [[_glPolygonMode]], [[_glPolygonStipple]], [[_glPushAttrib]]
* [[_glPointSize]], [[_glPolygonMode]], [[_glPolygonStipple]], [[_glPushAttrib]]
* [[_glPushMatrix]], [[_glPushName]], [https://docs.microsoft.com/en-us/windows/win32/opengl/glrasterpos-functions _glRasterPos], [[_glReadPixels]]
* [[_glPushMatrix]], [[_glPushName]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glrasterpos-functions _glRasterPos], [[_glReadPixels]]
* [[_glScissor]], [[_glShadeModel]], [[_glStencilFunc]], [[_glStencilMask]]
* [[_glScissor]], [[_glShadeModel]], [[_glStencilFunc]], [[_glStencilMask]]
* [[_glStencilOp]], [https://docs.microsoft.com/en-us/windows/win32/opengl/gltexcoord-functions _glTexCoord], [https://docs.microsoft.com/en-us/windows/win32/opengl/gltexenv-functions _glTexEnv], [https://docs.microsoft.com/en-us/windows/win32/opengl/gltexgen-functions _glTexGen]
* [[_glStencilOp]], [https://learn.microsoft.com/en-us/windows/win32/opengl/gltexcoord-functions _glTexCoord], [https://learn.microsoft.com/en-us/windows/win32/opengl/gltexenv-functions _glTexEnv], [https://learn.microsoft.com/en-us/windows/win32/opengl/gltexgen-functions _glTexGen]
* [[_glTexImage1D]], [[_glTexImage2D]], [[_glViewport]]
* [[_glTexImage1D]], [[_glTexImage2D]], [[_glViewport]]




{{PageNavigation}}
{{PageNavigation}}
[[Category:Final]]

Latest revision as of 00:59, 28 January 2023

The _glGetFloatv statement returns the value or values of a selected parameter.


Syntax

_glGetFloatv GLenum pname, GLfloat *params


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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