glCopyTexImage1D(3G) OpenGL Reference glCopyTexImage1D(3G)
glCopyTexImage1D - copy pixels into a 1D texture image
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_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 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
n
2 + 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.
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
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glCopyTexImage1D(3G) OpenGL Reference glCopyTexImage1D(3G)
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 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.
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 max, where
2
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 +
n
GL_MAX_TEXTURE_SIZE, or if it cannot be represented as 2 + 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.
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glCopyTexImage1D(3G) OpenGL Reference glCopyTexImage1D(3G)
glGetTexImage
glIsEnabled with argument GL_TEXTURE_1D
MACHINE DEPENDENCIES
glCopyTexImage1D and glCopyTexImage1DEXT are not supported on
RealityEngine, RealityEngine2, and VTX systems.
On InfiniteReality systems, there is a performance benefit when the width
of the image to be transferred to texture memory is a multiple of 8.
Texture borders are not supported on InfiniteReality systems.
Applications should use borderless textures and GL_CLAMP_TO_EDGE_SGIS
wrap mode.
On High Impact and Maximum Impact systems the number of bits per
component, represented internally, is the same for all components and
will be 4, 8, or 12 bits per component. All specified internal formats
will receive an equal or greater representation in this scheme, up to the
12-bit limit. High Impact and Maximum Impact on Indigo2 systems do not
support texture internal formats of the type GL_INTENSITY or GL_ALPHA,
although High Impact and Maximum Impact on Octane systems do support
these types.
High Impact and Maximum Impact on Indigo2 systems without the TRAM option
card support 4 bits per component for GL_RGB and GL_RGBA, 4/8 bits per
component for GL_LUMINANCE_ALPHA, and 4/8/12 bits per component for
GL_LUMINANCE.
glCopyPixels, glCopyTexImage2D, glCopyTexSubImage1D, glCopyTexSubImage2D,
glPixelStore, glPixelTransfer, glTexEnv, glTexGen, glTexImage1D,
glTexImage2D, glTexSubImage1D, glTexSubImage2D, glTexParameter
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