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glTexSubImage2D(3G)
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glTexSubImage2D - specify a two-dimensional texture subimage
void glTexSubImage2D(
GLenum target,
GLint level,
GLint xoffset,
GLint yoffset,
GLsizei width,
GLsizei height,
GLenum format,
GLenum type,
const GLvoid *pixels );
Specifies the target texture. Must be GL_TEXTURE_2D.
Specifies the level-of-detail number. Level 0 is the base
image level. Level n is the nth mipmap reduction image.
Specifies a texel offset in the x direction within the
texture array. Specifies a texel offset in the y direction
within the texture array. Specifies the width of the
texture subimage. Specifies the height of the texture
subimage. Specifies the of the pixel data. The following
symbolic values are accepted: GL_COLOR_INDEX, GL_RED,
GL_GREEN, GL_BLUE, GL_ALPHA, GL_RGB, GL_BGR, GL_RGBA,
GL_BGRA, GL_LUMINANCE, and GL_LUMINANCE_ALPHA. Specifies
the data type of the pixel data. The following symbolic
values are accepted: GL_UNSIGNED_BYTE, GL_BYTE, GL_BITMAP,
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. Specifies a pointer
to the image data in memory.
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
glEnable() and glDisable() with argument GL_TEXTURE_2D.
glTexSubImage2D() redefines a contiguous subregion of an
existing two-dimensional texture image. The texels referenced
by pixels 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.
glTexSubImage2D() is available only if the GL version is
1.1 or greater.
Texturing has no effect in color index mode.
glPixelStore() and glPixelTransfer() modes affect texture
images in exactly the way they affect glDrawPixels().
Formats GL_BGR, and GL_BGRA and types
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 are available only if the
GL version is 1.2 or greater.
When the GL_ARB_multitexture extension is supported,
glTexSubImage2D() specifies a two-dimensional[t]exture for
the current texture unit, specified with glActiveTextureARB().
When the GL_ARB_imaging extension is supported, the RGBA
components specified in pixels may be processed by the
imaging pipeline. See glTexImage1D() for specific
details.
GL_INVALID_ENUM is generated if target is not GL_TEXTURE_2D.
GL_INVALID_OPERATION is generated if the texture array has
not been defined by a previous glTexImage2D() operation.
GL_INVALID_VALUE is generated if level is less than 0.
GL_INVALID_VALUE may be generated if level is greater than
log sub 2max, where max is the returned value of
GL_MAX_TEXTURE_SIZE.
GL_INVALID_VALUE is generated if xoffset < -b, (xoffset +
width) > (w-b), yoffset < -b, or (yoffset + height) > (hb),
where w is the GL_TEXTURE_WIDTH, h is the GL_TEXTURE_HEIGHT,
and b is the border width of the texture
image being modified. Note that w and h include twice the
border width.
GL_INVALID_VALUE is generated if width or height is less
than 0.
GL_INVALID_ENUM is generated if format is not an accepted
constant.
GL_INVALID_ENUM is generated if type is not a type constant.
GL_INVALID_ENUM is generated if type is GL_BITMAP and format
is not GL_COLOR_INDEX.
GL_INVALID_OPERATION is generated if glTexSubImage2D() is
executed between the execution of glBegin() and the corresponding
execution of glEnd().
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.
glGetTexImage()
glIsEnabled() with argument GL_TEXTURE_2D
glActiveTextureARB(3), glCopyTexImage1D(3), , glCopyTexImage2D(3), , glCopyTexSubImage1D(3), glCopyTexSubImage2D(3), glCopyTexSubImage3D(3), , glDrawPixels(3),
glPixelStore(3), glPixelTransfer(3), glTexEnv(3), glTexImage2D(3), glTexGen(3), glTexImage1D(3), glTexImage3D(3),
glTexSubImage1D(3), glTexSubImage3D(3), glTexParameter(3)
glTexSubImage2D(3G)
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