GLCOPYTEXIMAGE1D(3G)

✨ NAME ✨

glCopyTexImage1D — copy pixels into a 1D texture image. okay bestie, that's the whole assignment, and this is the GLCOPYTEXIMAGE1D(3G) page from the 3G manual. buckle up. 💖

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💻 C SPECIFICATION 💻

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

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🎀 PARAMETERS 🎀

• target — which texture target we're hitting. Must be GL_TEXTURE_1D. no other target, no cap.
• level — the level-of-detail number. Level 0 is the base image level. Level n is the nth mipmap reduction image.
• internalformat — the internal format of the texture. Must be one of these exact symbolic constants, bestie: 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.
• x, y — window coordinates of the left corner of the row of pixels to be copied.
• width — width of the texture image. Must be 0 or 2n+2*border for some integer n. The height of the texture image is 1.
• border — width of the border. Must be either 0 or 1.

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🦋 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. 🚨

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

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💀 ERRORS 💀

• GL_INVALID_ENUM — generated if target is not one of the allowable values.
• GL_INVALID_VALUE — generated if level is less than 0.
• GL_INVALID_VALUE — may be generated if level is greater than log2max, where max is the returned value of GL_MAX_TEXTURE_SIZE.
• GL_INVALID_VALUE — generated if internalformat is not an allowable value.
• GL_INVALID_VALUE — generated if width is less than 0 or greater than 2 + GL_MAX_TEXTURE_SIZE, or if it cannot be represented as 2n+2*(border) for some integer value of n.
• GL_INVALID_VALUE — generated if border is not 0 or 1.
• GL_INVALID_OPERATION — generated if glCopyTexImage1D is executed between the execution of glBegin and the corresponding execution of glEnd.

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🔥 ASSOCIATED GETS 🔥

• glGetTexImage
• glIsEnabled with argument GL_TEXTURE_1D

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🌈 SEE ALSO 🌈

• glCopyPixels(3G)
• glCopyTexImage2D(3G)
• glCopyTexSubImage1D(3G)
• glCopyTexSubImage2D(3G)
• glPixelStore(3G)
• glPixelTransfer(3G)
• glTexEnv(3G)
• glTexGen(3G)
• glTexImage1D(3G)
• glTexImage2D(3G)
• glTexSubImage1D(3G)
• glTexSubImage2D(3G)
• glTexParameter(3G)

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💖 okay that's the whole GLCOPYTEXIMAGE1D(3G) page from the 3G manual set — footer included. The footer line is literally just GLCOPYTEXIMAGE1D(3G) (no separate source/version/date line printed here), so that's the cute sign-off: GLCOPYTEXIMAGE1D(3G) and we're out. periodt. ✨