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glCopyTexImage1D — copy pixels into a 1D texture image

C Specification

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

Parameters

target

Specifies the target texture. Must be GL_TEXTURE_1D.

level

Specifies the level-of-detail number. Level 0 is the base image level. Level n is the nth mipmap reduction image.

internalformat

Specifies the internal format of the texture. Must be one of the following symbolic constants: GL_ALPHA, GL_ALPHA4, GL_ALPHA8, GL_ALPHA12, GL_ALPHA16, GL_COMPRESSED_ALPHA, GL_COMPRESSED_LUMINANCE, GL_COMPRESSED_LUMINANCE_ALPHA, GL_COMPRESSED_INTENSITY, GL_COMPRESSED_RGB, GL_COMPRESSED_RGBA, GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT24, GL_DEPTH_COMPONENT32, GL_LUMINANCE, GL_LUMINANCE4, GL_LUMINANCE8, GL_LUMINANCE12, GL_LUMINANCE16, GL_LUMINANCE_ALPHA, GL_LUMINANCE4_ALPHA4, GL_LUMINANCE6_ALPHA2, GL_LUMINANCE8_ALPHA8, GL_LUMINANCE12_ALPHA4, GL_LUMINANCE12_ALPHA12, GL_LUMINANCE16_ALPHA16, GL_INTENSITY, GL_INTENSITY4, GL_INTENSITY8, GL_INTENSITY12, GL_INTENSITY16, 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_SLUMINANCE, GL_SLUMINANCE8, GL_SLUMINANCE_ALPHA, GL_SLUMINANCE8_ALPHA8, 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. Must be 0 or 2 n + 2 ⁡ border for some integer n. The height of the texture image is 1.

border

Specifies the width of the border. Must be either 0 or 1.

Description

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

The screen-aligned pixel row with left corner at x y and with a length of width + 2 ⁡ border 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 glCopyPixels had been called, but the process stops just before final conversion. At this point all pixel component values are clamped to the range 0 1 and then converted to the texture's internal format for storage in the texel array.

Pixel ordering is such that lower x 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

glCopyTexImage1D is available only if the GL version is 1.1 or greater.

Texturing has no effect in color index mode.

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

An image with 0 width indicates a NULL texture.

When the ARB_imaging extension is supported, the RGBA components copied from the framebuffer may be processed by the imaging pipeline. See glTexImage1D for specific details.

GL_DEPTH_COMPONENT, GL_DEPTH_COMPONENT16, GL_DEPTH_COMPONENT24, and GL_DEPTH_COMPONENT32 are available only if the GL version is 1.4 or greater.

Non-power-of-two textures are supported if the GL version is 2.0 or greater, or if the implementation exports the GL_ARB_texture_non_power_of_two extension.

The GL_SRGB, GL_SRGB8, GL_SRGB_ALPHA, GL_SRGB8_ALPHA8, GL_SLUMINANCE, GL_SLUMINANCE8, GL_SLUMINANCE_ALPHA, and GL_SLUMINANCE8_ALPHA8 internal formats are only available if the GL version is 2.1 or greater. See glTexImage1D for specific details about sRGB conversion.

Errors

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 log 2 ⁢ max , where max 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 2 + GL_MAX_TEXTURE_SIZE.

GL_INVALID_VALUE is generated if non-power-of-two textures are not supported and the width cannot be represented as 2 n + 2 ⁡ border for some integer value of n.

GL_INVALID_VALUE is generated if border is not 0 or 1.

GL_INVALID_OPERATION is generated if glCopyTexImage1D is executed between the execution of glBegin and the corresponding execution of glEnd.

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

glGetTexImage

glIsEnabled with argument GL_TEXTURE_1D

See Also

glCopyPixels, glCopyTexImage2D, glCopyTexSubImage1D, glCopyTexSubImage2D, glPixelStore, glPixelTransfer, glTexEnv, glTexGen, glTexImage1D, glTexImage2D, glTexSubImage1D, glTexSubImage2D, 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/.