_glGetBooleanv
Jump to navigation
Jump to search
The _glGetBooleanv statement returns the value or values of a selected parameter.
Syntax
- _glGetBooleanv GLenum pname, GLboolean *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
- SUB _GL
- _glAccum, _glAlphaFunc, _glBegin, _glBlendFunc
- _glCallList, _glClearAccum, _glClearColor, _glClearDepth
- _glClearIndex, _glClearStencil, _glClipPlane, _glColor
- _glColorMask, _glColorMaterial, _glCullFace, _glDepthFunc
- _glDepthMask, _glDepthRange, _glDrawBuffer, _glEdgeFlag
- _glEnd, _glFog, _glFrontFace, _glGetClipPlane
- _glGetError, _glGetLight, _glGetMap, _glGetMaterial
- _glGetPixelMap, _glGetPolygonStipple, _glGetString, _glGetTexEnv
- _glGetTexGen, _glGetTexImage, _glGetTexLevelParameter, _glGetTexParameter
- _glHint, _glIndex, _glIndexMask, _glIsEnabled
- _glLight, _glLightModel, _glLineStipple, _glLineWidth
- _glListBase, _glLogicOp, _glMap1, _glMap2
- _glMapGrid, _glMatrixMode, _glNewList, _glNormal
- _glPixelMap, _glPixelStore, _glPixelTransfer, _glPixelZoom
- _glPointSize, _glPolygonMode, _glPolygonStipple, _glPushAttrib
- _glPushMatrix, _glPushName, _glRasterPos, _glReadPixels
- _glScissor, _glShadeModel, _glStencilFunc, _glStencilMask
- _glStencilOp, _glTexCoord, _glTexEnv, _glTexGen
- _glTexImage1D, _glTexImage2D, _glViewport