glCopyTexImage1D

From OpenGL Reference
Jump to navigation Jump to search

Copy pixels into a 1D texture image.

C Specification[edit]

void glCopyTexImage1D( GLenum target, GLint level, GLenum internalformat, GLint x, GLint y, GLsizei width, GLint border );


Parameters[edit]

target - Specifies the target texture. Must be GL_TEXTURE_1D .
level - Specifies the level-of-detail number. Level 0 is the base image level. Levelnis thenth mipmap reduction image.
internalformat - Specifies the internal format of the texture. Must be one of the following symbolic constants: GL_COMPRESSED_RED , GL_COMPRESSED_RG , GL_COMPRESSED_RGB , GL_COMPRESSED_RGBA . GL_COMPRESSED_SRGB , GL_COMPRESSED_SRGB_ALPHA . GL_DEPTH_COMPONENT , GL_DEPTH_COMPONENT16 , GL_DEPTH_COMPONENT24 , GL_DEPTH_COMPONENT32 , GL_STENCIL_INDEX8 , GL_RED , GL_RG , GL_RGB , GL_R3_G3_B2 , GL_RGB4 , GL_RGB5 , GL_RGB8 , GL_RGB10 , GL_RGB12 , GL_RGB16 , GL_RGBA , GL_RGBA2 , GL_RGBA4 , GL_RGB5_A1 , GL_RGBA8 , GL_RGB10_A2 , GL_RGBA12 , GL_RGBA16 , GL_SRGB , GL_SRGB8 , GL_SRGB_ALPHA , or GL_SRGB8_ALPHA8 .
x -y - Specify the window coordinates of the left corner of the row of pixels to be copied.
width - Specifies the width of the texture image. The height of the texture image is 1.
border - Must be 0.


Description[edit]

 glCopyTexImage1D defines a one-dimensional texture image with pixels from the current GL_READ_BUFFER .

The screen-aligned pixel row with left corner at [math]()[/math] and with a length of [math][/math] defines the texture array at the mipmap level specified by level . internalformat specifies the internal format of the texture array.

The pixels in the row are processed exactly as if glReadPixels had been called, but the process stops just before final conversion. At this point all pixel component values are clamped to the range [math][0,1][/math] and then converted to the texture's internal format for storage in the texel array.

Pixel ordering is such that lower [math][/math] screen coordinates correspond to lower texture coordinates.

If any of the pixels within the specified row of the current GL_READ_BUFFER are outside the window associated with the current rendering context, then the values obtained for those pixels are undefined.

 glCopyTexImage1D defines a one-dimensional texture image with pixels from the current GL_READ_BUFFER .

When internalformat is one of the sRGB types, the GL does not automatically convert the source pixels to the sRGB color space. In this case, the glPixelMap function can be used to accomplish the conversion.


Notes[edit]

1, 2, 3, and 4 are not accepted values for internalformat .

An image with 0 width indicates a NULL texture.

 GL_STENCIL_INDEX8 is accepted for internalformat only if the GL version is 4.4 or higher.


Errors[edit]

 GL_INVALID_ENUM is generated if target is not one of the allowable values.

 GL_INVALID_VALUE is generated if level is less than 0.

 GL_INVALID_VALUE may be generated if level is greater than [math]log_{}⁢max[/math] , where [math][/math] is the returned value of GL_MAX_TEXTURE_SIZE .

 GL_INVALID_VALUE is generated if internalformat is not an allowable value.

 GL_INVALID_VALUE is generated if width is less than 0 or greater than GL_MAX_TEXTURE_SIZE .

 GL_INVALID_VALUE is generated if border is not 0.

 GL_INVALID_OPERATION is generated if internalformat is GL_DEPTH_COMPONENT , GL_DEPTH_COMPONENT16 , GL_DEPTH_COMPONENT24 , or GL_DEPTH_COMPONENT32 and there is no depth buffer.


Associated Gets[edit]

 glGetTexImage 


Version Support[edit]

 glCopyTexImage1D  2.0+

See Also[edit]

 glCopyTexImage2D , glCopyTexSubImage1D , glCopyTexSubImage2D , glPixelStore , glTexImage1D , glTexImage2D , glTexSubImage1D , glTexSubImage2D , glTexParameter 


Copyright[edit]

Copyright© 1991-2006 Silicon Graphics, Inc. Copyright© 2012-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.