| Extracted from Pike v7.8 release 866 at 2018-07-18.

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GL

# Method GL.glCopyTexImage1D()

Method glCopyTexImage1D

  `void glCopyTexImage1D(int target, int level, int internalFormat, int x, int y, int width, int border)`

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.

Parameter `target`

  Specifies the target texture. Must be GL_TEXTURE_1D .

Parameter `level`

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

Parameter `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_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 , or GL_RGBA16 .

Parameter `x`

  Specify the window coordinates of the left corner of the row of pixels to be copied.

Parameter `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.

Parameter `border`

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

Throws

  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. .P GL_INVALID_VALUE may be generated if level is greater than log sub 2 max, where max is the returned value of GL_MAX_TEXTURE_SIZE . .P 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 , or if it 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 .