4.7 KiB
_glCopyTexImage1D: copy pixels into a 1D texture image
Syntax
SUB _glCopyTexImage1D (BYVAL target AS _UNSIGNED LONG, BYVAL level AS LONG, BYVAL internalFormat AS _UNSIGNED LONG, BYVAL x AS LONG, BYVAL y AS LONG, BYVAL width AS LONG, BYVAL border AS LONG)
void _glCopyTexImage1D(GLenum target, GLint level, GLenum internalformat, GLint x, GLint y, GLsizei width, GLint border);
; 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_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_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 This value must be 0.
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 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 [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
1, 2, 3, and 4 are not accepted values for internalformat.
An image with 0 width indicates a NULL texture.
Error(s)
_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 log2(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 _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.
Use With
See Also
_GL _glActiveTexture, _glBindTexture, _glBindFramebuffer, _glCopyTexImage2D, _glCopyImageSubData, _glCopyTexSubImage1D, _glCopyTexSubImage2D, _glReadBuffer