GlTexSubImage2D: Difference between revisions

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'''_glTexSubImage2D:''' specify a two-dimensional texture subimage
{{DISPLAYTITLE:_glTexSubImage2D}}
The '''_glTexSubImage2D''' statement specifies a portion of an existing one-dimensional texture image. You cannot define a new texture with '''_glTexSubImage2D'''.




{{PageSyntax}}
{{PageSyntax}}
: [[_glTexSubImage2D]] GLenum {{Parameter|target}}, GLint {{Parameter|level}}, GLint {{Parameter|xoffset}}, GLint {{Parameter|yoffset}}, GLsizei {{Parameter|width}}, GLsizei {{Parameter|height}}, GLenum {{Parameter|format}}, GLenum {{Parameter|type}}, const GLvoid {{Parameter|*pixels}}


  SUB _glTexSubImage2D (BYVAL target AS _UNSIGNED LONG, BYVAL level AS LONG, BYVAL xoffset AS LONG, BYVAL yoffset AS LONG, BYVAL width AS LONG, BYVAL height AS LONG, BYVAL format AS _UNSIGNED LONG, BYVAL type AS _UNSIGNED LONG, pixels AS _OFFSET)
  void '''_glTexSubImage2D'''(GLenum {{Parameter|target}}, GLint {{Parameter|level}}, GLint {{Parameter|xoffset}}, GLint {{Parameter|yoffset}}, GLsizei {{Parameter|width}}, GLsizei {{Parameter|height}}, GLenum {{Parameter|format}}, GLenum {{Parameter|type}}, const GLvoid * {{Parameter|data}});


 
{{PageParameters}}
; target
* OpenGL is using its own set of variable types to describe its command parameters.
: Specifies the target texture. Must be {{KW|_GL_TEXTURE_2D}}, {{KW|_GL_TEXTURE_CUBE_MAP_POSITIVE_X}}, {{KW|_GL_TEXTURE_CUBE_MAP_NEGATIVE_X}}, {{KW|_GL_TEXTURE_CUBE_MAP_POSITIVE_Y}}, {{KW|_GL_TEXTURE_CUBE_MAP_NEGATIVE_Y}}, {{KW|_GL_TEXTURE_CUBE_MAP_POSITIVE_Z}}, {{KW|_GL_TEXTURE_CUBE_MAP_NEGATIVE_Z}}, or {{KW|_GL_TEXTURE_1D_ARRAY}}.
* Use the following table to find the respective QB64 [[Variable Types]].
; level
{{OpenGLTypesPlugin}}
: Specifies the level-of-detail number. Level 0 is the base image level. Level ''n'' is the ''n''th mipmap reduction image.
; xoffset
: Specifies a texel offset in the x direction within the texture array.
; yoffset
: Specifies a texel offset in the y direction within the texture array.
; width
: Specifies the width of the texture subimage.
; height
: Specifies the height of the texture subimage.
{{Glapi pixeltransferupparams|}}




{{PageDescription}}
{{PageDescription}}
 
* OpenGL's documentation is available in several places, so we won't reproduce it here for another time.
Texturing maps a portion of a specified texture image onto each graphical primitive for which texturing is enabled.
* The full description for this command can be found at [https://learn.microsoft.com/en-us/windows/win32/opengl/gltexsubimage2d Microsoft Docs] and is also valid for QB64 usage.
 
'''_glTexSubImage2D''' redefines a contiguous subregion of an existing two-dimensional or one-dimensional array texture image. The texels referenced by {{Parameter|data}} replace the portion of the existing texture array with x indices {{Parameter|xoffset}} and ''xoffset'' + ''width'' - 1, inclusive, and y indices {{Parameter|yoffset}} and ''yoffset'' + ''height'' - 1, inclusive. This region may not include any texels outside the range of the texture array as it was originally specified. It is not an error to specify a subtexture with zero width or height, but such a specification has no effect.
 
If a non-zero named buffer object is bound to the {{KW|_GL_PIXEL_UNPACK_BUFFER}} target (see {{KW|_glBindBuffer}}) while a texture image is specified, {{Parameter|data}} is treated as a byte offset into the buffer object's data store.
 
 
{{PageNotes}}
 
{{KW|_glPixelStore}} modes affect texture images.
 
'''_glTexSubImage2D''' specifies a two-dimensional subtexture for the current texture unit, specified with {{KW|_glActiveTexture}}.
 
 
{{PageErrors}}
 
{{KW|_GL_INVALID_ENUM}} is generated if {{Parameter|target}} is not {{KW|_GL_TEXTURE_2D}}, {{KW|_GL_TEXTURE_CUBE_MAP_POSITIVE_X}}, {{KW|_GL_TEXTURE_CUBE_MAP_NEGATIVE_X}}, {{KW|_GL_TEXTURE_CUBE_MAP_POSITIVE_Y}}, {{KW|_GL_TEXTURE_CUBE_MAP_NEGATIVE_Y}}, {{KW|_GL_TEXTURE_CUBE_MAP_POSITIVE_Z}}, {{KW|_GL_TEXTURE_CUBE_MAP_NEGATIVE_Z}}, or {{KW|_GL_TEXTURE_1D_ARRAY}}.
 
{{KW|_GL_INVALID_ENUM}} is generated if {{Parameter|format}} is not an accepted format constant.
 
{{KW|_GL_INVALID_ENUM}} is generated if {{Parameter|type}} is not a type constant.
 
{{KW|_GL_INVALID_VALUE}} is generated if {{Parameter|level}} is less than 0.
 
{{KW|_GL_INVALID_VALUE}} may be generated if {{Parameter|level}} is greater than log<sub>2</sub>(''max''), where ''max'' is the returned value of {{KW|_GL_MAX_TEXTURE_SIZE}}.
 
{{KW|_GL_INVALID_VALUE}} is generated if ''xoffset'' < 0, (''xoffset'' + ''width'') > ''w'', ''yoffset'' < 0, or (''yoffset'' + ''height'') > ''h'', where ''w'' is the {{KW|_GL_TEXTURE_WIDTH}} and ''h'' is the {{KW|_GL_TEXTURE_HEIGHT}}.
 
{{KW|_GL_INVALID_VALUE}} is generated if {{Parameter|width}} or {{Parameter|height}} is less than 0.
 
{{KW|_GL_INVALID_OPERATION}} is generated if the texture array has not been defined by a previous {{KW|_glTexImage2D}} operation.
 
{{KW|_GL_INVALID_OPERATION}} is generated if {{Parameter|type}} is one of {{KW|_GL_UNSIGNED_BYTE_3_3_2}}, {{KW|_GL_UNSIGNED_BYTE_2_3_3_REV}}, {{KW|_GL_UNSIGNED_SHORT_5_6_5}}, or {{KW|_GL_UNSIGNED_SHORT_5_6_5_REV}} and {{Parameter|format}} is not {{KW|_GL_RGB}}.
 
{{KW|_GL_INVALID_OPERATION}} is generated if {{Parameter|type}} is one of {{KW|_GL_UNSIGNED_SHORT_4_4_4_4}}, {{KW|_GL_UNSIGNED_SHORT_4_4_4_4_REV}}, {{KW|_GL_UNSIGNED_SHORT_5_5_5_1}}, {{KW|_GL_UNSIGNED_SHORT_1_5_5_5_REV}}, {{KW|_GL_UNSIGNED_INT_8_8_8_8}}, {{KW|_GL_UNSIGNED_INT_8_8_8_8_REV}}, {{KW|_GL_UNSIGNED_INT_10_10_10_2}}, or {{KW|_GL_UNSIGNED_INT_2_10_10_10_REV}} and {{Parameter|format}} is neither {{KW|_GL_RGBA}} nor {{KW|_GL_BGRA}}.
 
{{KW|_GL_INVALID_OPERATION}} is generated if a non-zero buffer object name is bound to the {{KW|_GL_PIXEL_UNPACK_BUFFER}} target and the buffer object's data store is currently mapped.
 
{{KW|_GL_INVALID_OPERATION}} is generated if a non-zero buffer object name is bound to the {{KW|_GL_PIXEL_UNPACK_BUFFER}} target and the data would be unpacked from the buffer object such that the memory reads required would exceed the data store size.
 
{{KW|_GL_INVALID_OPERATION}} is generated if a non-zero buffer object name is bound to the {{KW|_GL_PIXEL_UNPACK_BUFFER}} target and {{Parameter|data}} is not evenly divisible into the number of bytes needed to store in memory a datum indicated by {{Parameter|type}}.
 
 
{{PageUseWith}}
 
{{KW|_glGetTexImage}}
 
{{KW|_glGet}} with argument {{KW|_GL_PIXEL_UNPACK_BUFFER_BINDING}}




{{PageSeeAlso}}
{{PageSeeAlso}}
 
* [[_GL|SUB _GL]]
[[_GL|SUB _GL]]
* [[_glCopyTexImage1D]], [[_glCopyTexImage2D]], [[_glCopyTexSubImage1D]], [[_glCopyTexSubImage2D]]
{{KW|_glActiveTexture}}, {{KW|_glBindTexture}}, {{KW|_glTexSubImage1D}}, {{KW|_glTexSubImage3D}}, {{KW|_glCopyTexImage2D}}, {{KW|_glTexImage2D}}, {{KW|_glTexStorage2D}}, {{KW|_glTextureView}}, {{KW|_glPixelStore}}
* [[_glDrawPixels]], [[_glEnable]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glfog _glFog], [[_glGetTexImage]]
 
* [[_glIsEnabled]], [https://learn.microsoft.com/en-us/windows/win32/opengl/glpixelstore-functions _glPixelStore], [https://learn.microsoft.com/en-us/windows/win32/opengl/glpixeltransfer _glPixelTransfer], [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]], [[_glTexSubImage1D]]
{{PageCopyright}}
* [[_glTexImage2D]], [https://learn.microsoft.com/en-us/windows/win32/opengl/gltexparameter-functions _glTexParameter]




{{PageNavigation}}
{{PageNavigation}}

Latest revision as of 01:50, 28 January 2023

The _glTexSubImage2D statement specifies a portion of an existing one-dimensional texture image. You cannot define a new texture with _glTexSubImage2D.


Syntax

_glTexSubImage2D GLenum target, GLint level, GLint xoffset, GLint yoffset, 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


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