glGetTexLevelParameter — return texture parameter values for a specific level of detail
void glGetTexLevelParameterfv(
|
GLenum target, |
| GLint level, | |
| GLenum pname, | |
GLfloat * params); |
void glGetTexLevelParameteriv(
|
GLenum target, |
| GLint level, | |
| GLenum pname, | |
GLint * params); |
target
Specifies the symbolic name of the target texture,
one of
GL_TEXTURE_2D,
GL_TEXTURE_3D,
GL_TEXTURE_2D_ARRAY,
GL_TEXTURE_2D_MULTISAMPLE,
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.
level
Specifies the level-of-detail number of the desired image. Level 0 is the base image level. Level is the th mipmap reduction image.
pname
Specifies the symbolic name of a texture parameter.
GL_TEXTURE_WIDTH,
GL_TEXTURE_HEIGHT,
GL_TEXTURE_DEPTH,
GL_TEXTURE_INTERNAL_FORMAT,
GL_TEXTURE_SAMPLES,
GL_TEXTURE_FIXED_SAMPLE_LOCATIONS,
GL_TEXTURE_RED_SIZE,
GL_TEXTURE_GREEN_SIZE,
GL_TEXTURE_BLUE_SIZE,
GL_TEXTURE_ALPHA_SIZE,
GL_TEXTURE_DEPTH_SIZE,
GL_TEXTURE_STENCIL_SIZE,
GL_TEXTURE_SHARED_SIZE,
GL_TEXTURE_RED_TYPE,
GL_TEXTURE_GREEN_TYPE,
GL_TEXTURE_BLUE_TYPE,
GL_TEXTURE_ALPHA_TYPE,
GL_TEXTURE_DEPTH_TYPE, and
GL_TEXTURE_COMPRESSED
are accepted.
params
Returns the requested data.
glGetTexLevelParameter returns in params texture parameter values for a specific
level-of-detail value,
specified as level.
target defines the target texture,
either GL_TEXTURE_2D, GL_TEXTURE_3D,
GL_TEXTURE_2D_ARRAY, GL_TEXTURE_2D_MULTISAMPLE,
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.
pname specifies the texture parameter whose value or values
will be returned.
The accepted parameter names are as follows:
GL_TEXTURE_WIDTH
params returns a single value,
the width of the texture image.
The initial value is 0.
GL_TEXTURE_HEIGHT
params returns a single value,
the height of the texture image.
The initial value is 0.
GL_TEXTURE_DEPTH
params returns a single value,
the depth of the texture image.
The initial value is 0.
GL_TEXTURE_INTERNAL_FORMAT
params returns a single value,
the internal format of the texture image.
GL_TEXTURE_SAMPLES
params returns a single value,
the number of samples of the texture image.
GL_FIXED_SAMPLE_LOCATIONS
params returns a single boolean value
indicating if texture sample fixed locations are enabled.
GL_TEXTURE_RED_TYPE,
GL_TEXTURE_GREEN_TYPE,
GL_TEXTURE_BLUE_TYPE,
GL_TEXTURE_ALPHA_TYPE,
GL_TEXTURE_DEPTH_TYPE
The data type used to store the component.
The types GL_NONE, GL_SIGNED_NORMALIZED,
GL_UNSIGNED_NORMALIZED, GL_FLOAT,
GL_INT, and GL_UNSIGNED_INT may be returned
to indicate missing, signed normalized fixed-point, unsigned normalized fixed-point,
floating-point, signed unnormalized integer,
and unsigned unnormalized integer components, respectively.
GL_TEXTURE_RED_SIZE,
GL_TEXTURE_GREEN_SIZE,
GL_TEXTURE_BLUE_SIZE,
GL_TEXTURE_ALPHA_SIZE,
GL_TEXTURE_DEPTH_SIZE,
GL_TEXTURE_SHARED_SIZE
The actual internal storage resolution of an individual component.
GL_TEXTURE_COMPRESSED
params returns a single boolean value indicating if the texture image is
stored in a compressed internal format.
If an error is generated,
no change is made to the contents of params.
glGetTexLevelParameter returns the texture level parameters for the active texture unit.
GL_INVALID_ENUM is generated if target or pname is not an
accepted value.
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_MAX_3D_TEXTURE_SIZE or GL_MAX_CUBEMAP_TEXTURE_SIZE.
GL_INVALID_VALUE is generated if target is GL_TEXTURE_2D_MULTISAMPLE
and level is not zero.
| OpenGL ES API Version | |||
|---|---|---|---|
| Function Name | 2.0 | 3.0 | 3.1 |
glGetTexLevelParameterfv
|
- | - | ✔ |
glGetTexLevelParameteriv
|
- | - | ✔ |
glActiveTexture, glGetTexParameter, glCopyTexImage2D, glCopyTexSubImage2D, glCopyTexSubImage3D, glTexImage2D, glTexImage3D, glTexSubImage2D, glTexSubImage3D, glTexParameter glTexStorage2D, glTexStorage2DMultisample, glTexStorage3D,
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