glCopyTexImage2D — copy pixels into a 2D texture image
void glCopyTexImage2D( | GLenum | target, |
| GLint | level, | |
| GLenum | internalformat, | |
| GLint | x, | |
| GLint | y, | |
| GLsizei | width, | |
| GLsizei | height, | |
| GLint | border); |
target
Specifies the target texture.
Must be GL_TEXTURE_2D,
GL_TEXTURE_CUBE_MAP_POSITIVE_X,
GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
GL_TEXTURE_CUBE_MAP_POSITIVE_Z, or
GL_TEXTURE_CUBE_MAP_NEGATIVE_Z.
levelSpecifies 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, ySpecify the window coordinates of the lower left corner of the rectangular region of pixels to be copied.
width
Specifies the width of the texture image.
Must be 0 or
height
Specifies the height of the texture image.
Must be 0 or
borderSpecifies the width of the border. Must be either 0 or 1.
glCopyTexImage2D defines a two-dimensional texture image, or cube-map texture image
with pixels from the current
GL_READ_BUFFER.
The screen-aligned pixel rectangle with lower left corner at (x,
y) and with a width of
level.
internalformat specifies the internal format of the texture array.
The pixels in the rectangle 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
Pixel ordering is such that lower
If any of the pixels within the specified rectangle 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.
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.
glCopyTexImage2D 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 height or width of 0 indicates a NULL texture.
When the ARB_imaging extension is supported, the RGBA components read from the framebuffer may be processed by the imaging pipeline. See glTexImage1D for specific details.
GL_TEXTURE_CUBE_MAP_POSITIVE_X,
GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
GL_TEXTURE_CUBE_MAP_POSITIVE_Z,
GL_TEXTURE_CUBE_MAP_NEGATIVE_Z, or
GL_PROXY_TEXTURE_CUBE_MAP are available only if the GL version is 1.3
or greater.
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.
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 glTexImage2D for specific details about sRGB conversion.
GL_INVALID_ENUM is generated if target is not GL_TEXTURE_2D,
GL_TEXTURE_CUBE_MAP_POSITIVE_X,
GL_TEXTURE_CUBE_MAP_NEGATIVE_X,
GL_TEXTURE_CUBE_MAP_POSITIVE_Y,
GL_TEXTURE_CUBE_MAP_NEGATIVE_Y,
GL_TEXTURE_CUBE_MAP_POSITIVE_Z, or
GL_TEXTURE_CUBE_MAP_NEGATIVE_Z.
GL_INVALID_VALUE is generated if level is less than 0.
GL_INVALID_VALUE may be generated if level is greater
than
GL_MAX_TEXTURE_SIZE.
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 or depth cannot be represented as
GL_INVALID_VALUE is generated if border is not 0 or 1.
GL_INVALID_VALUE is generated if internalformat is not an
accepted format.
GL_INVALID_OPERATION is generated if glCopyTexImage2D 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.
glCopyPixels, glCopyTexImage1D, glCopyTexSubImage1D, glCopyTexSubImage2D, glPixelStore, glPixelTransfer, glTexEnv, glTexGen, glTexImage1D, glTexImage2D, glTexSubImage1D, glTexSubImage2D, glTexParameter
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