GlCopyTexImage2D: Difference between revisions
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* [[_GL|SUB _GL]] | * [[_GL|SUB _GL]] | ||
* [[_glBegin]], [[_glCopyTexImage1D]], [[_glDrawPixels]], [[_glEnd]] | * [[_glBegin]], [[_glCopyTexImage1D]], [[_glDrawPixels]], [[_glEnd]] | ||
* [ | * [https://docs.microsoft.com/en-us/windows/win32/opengl/glfog _glFog], [https://docs.microsoft.com/en-us/windows/win32/opengl/glpixelstore-functions _glPixelStore], [https://docs.microsoft.com/en-us/windows/win32/opengl/glpixeltransfer _glPixelTransfer], [https://docs.microsoft.com/en-us/windows/win32/opengl/gltexenv-functions _glTexEnv] | ||
* [ | * [https://docs.microsoft.com/en-us/windows/win32/opengl/gltexgen-functions _glTexGen], [[_glTexImage1D]], [[_glTexImage2D]], [https://docs.microsoft.com/en-us/windows/win32/opengl/gltexparameter-functions _glTexParameter] | ||
Revision as of 16:21, 22 July 2022
The _glCopyTexImage2D statement copies pixels from the framebuffer into a two-dimensional texture image.
Syntax
- _glCopyTexImage2D GLenum target, GLint level, GLenum internalFormat, GLint x, GLint y, GLsizei width, GLsizei height, GLint border
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
- _glBegin, _glCopyTexImage1D, _glDrawPixels, _glEnd
- _glFog, _glPixelStore, _glPixelTransfer, _glTexEnv
- _glTexGen, _glTexImage1D, _glTexImage2D, _glTexParameter