Difference between revisions of "GLAPI/glTexSubImage2D"

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(Function Definition)
m (Bot: Adding better formatting.)
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; target
 
; target
: Specifies the target texture. Must be {{enum|GL_TEXTURE_2D}}, {{enum|GL_TEXTURE_CUBE_MAP_POSITIVE_X}}, {{enum|GL_TEXTURE_CUBE_MAP_NEGATIVE_X}}, {{enum|GL_TEXTURE_CUBE_MAP_POSITIVE_Y}}, {{enum|GL_TEXTURE_CUBE_MAP_NEGATIVE_Y}}, {{enum|GL_TEXTURE_CUBE_MAP_POSITIVE_Z}}, or {{enum|GL_TEXTURE_CUBE_MAP_NEGATIVE_Z}}.
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: Specifies the target texture. Must be {{enum|GL_TEXTURE_2D}}, {{enum|GL_TEXTURE_CUBE_MAP_POSITIVE_X}}, {{enum|GL_TEXTURE_CUBE_MAP_NEGATIVE_X}}, {{enum|GL_TEXTURE_CUBE_MAP_POSITIVE_Y}}, {{enum|GL_TEXTURE_CUBE_MAP_NEGATIVE_Y}}, {{enum|GL_TEXTURE_CUBE_MAP_POSITIVE_Z}}, {{enum|GL_TEXTURE_CUBE_MAP_NEGATIVE_Z}}, or {{enum|GL_TEXTURE_1D_ARRAY}}.
 
; level
 
; level
 
: Specifies the level-of-detail number. Level 0 is the base image level. Level ''n'' is the ''n''th mipmap reduction image.
 
: Specifies the level-of-detail number. Level 0 is the base image level. Level ''n'' is the ''n''th mipmap reduction image.
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== Description ==
 
== Description ==
  
Texturing maps a portion of a specified texture image onto each graphical primitive for which texturing is enabled. To enable and disable two-dimensional texturing, call {{apifunc|glEnable}} and {{apifunc|glDisable}} with argument {{enum|GL_TEXTURE_2D}}.
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Texturing maps a portion of a specified texture image onto each graphical primitive for which texturing is enabled.
  
'''glTexSubImage2D''' redefines a contiguous subregion of an existing two-dimensional texture image. The texels referenced by {{param|data}} replace the portion of the existing texture array with x indices {{param|xoffset}} and ''xoffset'' + ''width'' - 1, inclusive, and y indices {{param|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.
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'''glTexSubImage2D''' redefines a contiguous subregion of an existing two-dimensional or one-dimensional array texture image. The texels referenced by {{param|data}} replace the portion of the existing texture array with x indices {{param|xoffset}} and ''xoffset'' + ''width'' - 1, inclusive, and y indices {{param|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 {{enum|GL_PIXEL_UNPACK_BUFFER}} target (see {{apifunc|glBindBuffer}}) while a texture image is specified, {{param|data}} is treated as a byte offset into the buffer object's data store.
 
If a non-zero named buffer object is bound to the {{enum|GL_PIXEL_UNPACK_BUFFER}} target (see {{apifunc|glBindBuffer}}) while a texture image is specified, {{param|data}} is treated as a byte offset into the buffer object's data store.
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== Errors ==
 
== Errors ==
  
{{enum|GL_INVALID_ENUM}} is generated if {{param|target}} is not {{enum|GL_TEXTURE_2D}}, {{enum|GL_TEXTURE_CUBE_MAP_POSITIVE_X}}, {{enum|GL_TEXTURE_CUBE_MAP_NEGATIVE_X}}, {{enum|GL_TEXTURE_CUBE_MAP_POSITIVE_Y}}, {{enum|GL_TEXTURE_CUBE_MAP_NEGATIVE_Y}}, {{enum|GL_TEXTURE_CUBE_MAP_POSITIVE_Z}}, or {{enum|GL_TEXTURE_CUBE_MAP_NEGATIVE_Z}}.
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{{enum|GL_INVALID_ENUM}} is generated if {{param|target}} is not {{enum|GL_TEXTURE_2D}}, {{enum|GL_TEXTURE_CUBE_MAP_POSITIVE_X}}, {{enum|GL_TEXTURE_CUBE_MAP_NEGATIVE_X}}, {{enum|GL_TEXTURE_CUBE_MAP_POSITIVE_Y}}, {{enum|GL_TEXTURE_CUBE_MAP_NEGATIVE_Y}}, {{enum|GL_TEXTURE_CUBE_MAP_POSITIVE_Z}}, {{enum|GL_TEXTURE_CUBE_MAP_NEGATIVE_Z}}, or {{enum|GL_TEXTURE_1D_ARRAY}}.
  
 
{{enum|GL_INVALID_ENUM}} is generated if {{param|format}} is not an accepted format constant.
 
{{enum|GL_INVALID_ENUM}} is generated if {{param|format}} is not an accepted format constant.

Revision as of 22:01, 17 August 2012

glTexSubImage2D
Core in version 4.5
Core since version 1.0

glTexSubImage2D: specify a two-dimensional texture subimage

Function Definition

 void glTexSubImage2D(GLenum target​, GLint level​, GLint xoffset​, GLint yoffset​, GLsizei width​, GLsizei height​, GLenum format​, GLenum type​, const GLvoid * data​);
target
Specifies the target texture. Must be GL_TEXTURE_2D, GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, or GL_TEXTURE_1D_ARRAY.
level
Specifies the level-of-detail number. Level 0 is the base image level. Level n is the nth 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.
format
Specifies the format of the pixel data. For transfers of depth, stencil, or depth/stencil data, you must use GL_DEPTH_COMPONENT, GL_STENCIL_INDEX, or GL_DEPTH_STENCIL, where appropriate. For transfers of normalized integer or floating-point color image data, you must use one of the following: GL_RED, GL_GREEN, GL_BLUE, GL_RG, GL_RGB, GL_BGR, GL_RGBA, and GL_BGRA. For transfers of non-normalized integer data, you must use one of the following: GL_RED_INTEGER, GL_GREEN_INTEGER, GL_BLUE_INTEGER, GL_RG_INTEGER, GL_RGB_INTEGER, GL_BGR_INTEGER, GL_RGBA_INTEGER, and GL_BGRA_INTEGER.
type
Specifies the data type of the pixel data. The following symbolic values are accepted: GL_UNSIGNED_BYTE, GL_BYTE, GL_UNSIGNED_SHORT, GL_SHORT, GL_UNSIGNED_INT, GL_INT, GL_FLOAT, GL_UNSIGNED_BYTE_3_3_2, GL_UNSIGNED_BYTE_2_3_3_REV, GL_UNSIGNED_SHORT_5_6_5, GL_UNSIGNED_SHORT_5_6_5_REV, GL_UNSIGNED_SHORT_4_4_4_4, GL_UNSIGNED_SHORT_4_4_4_4_REV, GL_UNSIGNED_SHORT_5_5_5_1, GL_UNSIGNED_SHORT_1_5_5_5_REV, GL_UNSIGNED_INT_8_8_8_8, GL_UNSIGNED_INT_8_8_8_8_REV, GL_UNSIGNED_INT_10_10_10_2, and GL_UNSIGNED_INT_2_10_10_10_REV.
data
Specifies a pointer to the image data in memory, or if a buffer is bound to GL_PIXEL_UNPACK_BUFFER, this provides an integer offset into the bound buffer object. If a buffer is not bound to GL_PIXEL_UNPACK_BUFFER, and this parameter is NULL, no Pixel Transfer will be performed.


Description

Texturing maps a portion of a specified texture image onto each graphical primitive for which texturing is enabled.

glTexSubImage2D redefines a contiguous subregion of an existing two-dimensional or one-dimensional array texture image. The texels referenced by data​ replace the portion of the existing texture array with x indices xoffset​ and xoffset + width - 1, inclusive, and y indices 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 GL_PIXEL_UNPACK_BUFFER target (see glBindBuffer) while a texture image is specified, data​ is treated as a byte offset into the buffer object's data store.

Notes

glPixelStore modes affect texture images.

glTexSubImage2D specifies a two-dimensional subtexture for the current texture unit, specified with glActiveTexture.

Errors

GL_INVALID_ENUM is generated if target​ is not GL_TEXTURE_2D, GL_TEXTURE_CUBE_MAP_POSITIVE_X, GL_TEXTURE_CUBE_MAP_NEGATIVE_X, GL_TEXTURE_CUBE_MAP_POSITIVE_Y, GL_TEXTURE_CUBE_MAP_NEGATIVE_Y, GL_TEXTURE_CUBE_MAP_POSITIVE_Z, GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, or GL_TEXTURE_1D_ARRAY.

GL_INVALID_ENUM is generated if format​ is not an accepted format constant.

GL_INVALID_ENUM is generated if type​ is not a type constant.

GL_INVALID_VALUE is generated if level​ is less than 0.

GL_INVALID_VALUE may be generated if level​ is greater than log2(max), where max is the returned value of GL_MAX_TEXTURE_SIZE.

GL_INVALID_VALUE is generated if xoffset < 0, (xoffset + width) > w, yoffset < 0, or (yoffset + height) > h, where w is the GL_TEXTURE_WIDTH and h is the GL_TEXTURE_HEIGHT.

GL_INVALID_VALUE is generated if width​ or height​ is less than 0.

GL_INVALID_OPERATION is generated if the texture array has not been defined by a previous glTexImage2D operation.

GL_INVALID_OPERATION is generated if type​ is one of GL_UNSIGNED_BYTE_3_3_2, GL_UNSIGNED_BYTE_2_3_3_REV, GL_UNSIGNED_SHORT_5_6_5, or GL_UNSIGNED_SHORT_5_6_5_REV and format​ is not GL_RGB.

GL_INVALID_OPERATION is generated if type​ is one of GL_UNSIGNED_SHORT_4_4_4_4, GL_UNSIGNED_SHORT_4_4_4_4_REV, GL_UNSIGNED_SHORT_5_5_5_1, GL_UNSIGNED_SHORT_1_5_5_5_REV, GL_UNSIGNED_INT_8_8_8_8, GL_UNSIGNED_INT_8_8_8_8_REV, GL_UNSIGNED_INT_10_10_10_2, or GL_UNSIGNED_INT_2_10_10_10_REV and format​ is neither GL_RGBA nor GL_BGRA.

GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the GL_PIXEL_UNPACK_BUFFER target and the buffer object's data store is currently mapped.

GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the 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.

GL_INVALID_OPERATION is generated if a non-zero buffer object name is bound to the GL_PIXEL_UNPACK_BUFFER target and data​ is not evenly divisible into the number of bytes needed to store in memory a datum indicated by type​.

Associated Gets

glGetTexImage

glGet with argument GL_PIXEL_UNPACK_BUFFER_BINDING

See Also

glActiveTexture, glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D, glCopyTexSubImage2D, glCopyTexSubImage3D, glPixelStore, glTexImage1D, glTexImage2D, glTexImage3D, glTexSubImage1D, glTexSubImage3D, glTexParameter

Copyright

Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.