GlDrawPixels: Difference between revisions
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(Created page with "{{DISPLAYTITLE:_glDrawPixels}} The '''_glDrawPixels''' statement writes a block of pixels to the framebuffer. {{PageSyntax}} : '''_glDrawPixels''' GLsizei {{Parameter|width}}, GLsizei {{Parameter|height}}, GLenum {{Parameter|format}}, GLenum {{Parameter|type}}, const GLvoid {{Parameter|*pixels}} {{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]...") |
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{{PageSyntax}} | {{PageSyntax}} | ||
: | : [[_glDrawPixels]] GLsizei {{Parameter|width}}, GLsizei {{Parameter|height}}, GLenum {{Parameter|format}}, GLenum {{Parameter|type}}, const GLvoid {{Parameter|*pixels}} | ||
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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:// | * The full description for this command can be found at [https://learn.microsoft.com/en-us/windows/win32/opengl/gldrawpixels Microsoft Docs] and is also valid for QB64 usage. | ||
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* [[_GL|SUB _GL]] | * [[_GL|SUB _GL]] | ||
* [[_glAlphaFunc]], [[_glBegin]], [[_glBlendFunc]], [[_glCopyPixels]] | * [[_glAlphaFunc]], [[_glBegin]], [[_glBlendFunc]], [[_glCopyPixels]] | ||
* [[_glDepthFunc]], [[_glEnd]], [https:// | * [[_glDepthFunc]], [[_glEnd]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glgetbooleanv--glgetdoublev--glgetfloatv--glgetintegerv _glGet], [[_glLogicOp]] | ||
* [https:// | * [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]] | ||
* [https:// | * [https://learn.microsoft.com/en-us/windows/win32/opengl/glrasterpos-functions _glRasterPos], [[_glReadPixels]], [[_glScissor]], [[_glStencilFunc]] | ||
{{PageNavigation}} | {{PageNavigation}} | ||
Latest revision as of 00:50, 28 January 2023
The _glDrawPixels statement writes a block of pixels to the framebuffer.
Syntax
- _glDrawPixels GLsizei width, GLsizei height, GLenum format, GLenum type, const GLvoid *pixels
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
- _glAlphaFunc, _glBegin, _glBlendFunc, _glCopyPixels
- _glDepthFunc, _glEnd, _glGet, _glLogicOp
- _glPixelMap, _glPixelStore, _glPixelTransfer, _glPixelZoom
- _glRasterPos, _glReadPixels, _glScissor, _glStencilFunc