Manpages OpenGL - glgettexparameter

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Name

glGetTexParameter — return texture parameter values

C Specification

`void glGetTexParameterfv(`	GLenum	`target`,
	GLenum	`pname`,
	GLfloat *	`params)`;

`void glGetTexParameteriv(`	GLenum	`target`,
	GLenum	`pname`,
	GLint *	`params)`;

Parameters

target: Specifies the symbolic name of the target texture. GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, and GL_TEXTURE_CUBE_MAP are accepted.
pname: Specifies the symbolic name of a texture parameter. GL_TEXTURE_MAG_FILTER, GL_TEXTURE_MIN_FILTER, GL_TEXTURE_MIN_LOD, GL_TEXTURE_MAX_LOD, GL_TEXTURE_BASE_LEVEL, GL_TEXTURE_MAX_LEVEL, GL_TEXTURE_WRAP_S, GL_TEXTURE_WRAP_T, GL_TEXTURE_WRAP_R, GL_TEXTURE_BORDER_COLOR, GL_TEXTURE_PRIORITY, GL_TEXTURE_RESIDENT, GL_TEXTURE_COMPARE_MODE, GL_TEXTURE_COMPARE_FUNC, GL_DEPTH_TEXTURE_MODE, and GL_GENERATE_MIPMAP are accepted.
params: Returns the texture parameters.

Description

glGetTexParameter returns in params the value or values of the texture parameter specified as pname. target defines the target texture, either GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D, or GL_TEXTURE_CUBE_MAP, to specify one-, two-, or three-dimensional or cube-mapped texturing. pname accepts the same symbols as glTexParameter, with the same interpretations:

GL_TEXTURE_MAG_FILTER: Returns the single-valued texture magnification filter, a symbolic constant. The initial value is GL_LINEAR.
GL_TEXTURE_MIN_FILTER: Returns the single-valued texture minification filter, a symbolic constant. The initial value is GL_NEAREST_MIPMAP_LINEAR.
GL_TEXTURE_MIN_LOD: Returns the single-valued texture minimum level-of-detail value. The initial value is -1000 .
GL_TEXTURE_MAX_LOD: Returns the single-valued texture maximum level-of-detail value. The initial value is 1000.
GL_TEXTURE_BASE_LEVEL: Returns the single-valued base texture mipmap level. The initial value is 0.
GL_TEXTURE_MAX_LEVEL: Returns the single-valued maximum texture mipmap array level. The initial value is 1000.
GL_TEXTURE_WRAP_S: Returns the single-valued wrapping function for texture coordinate s, a symbolic constant. The initial value is GL_REPEAT.
GL_TEXTURE_WRAP_T: Returns the single-valued wrapping function for texture coordinate t, a symbolic constant. The initial value is GL_REPEAT.
GL_TEXTURE_WRAP_R: Returns the single-valued wrapping function for texture coordinate r, a symbolic constant. The initial value is GL_REPEAT.
GL_TEXTURE_BORDER_COLOR: Returns four integer or floating-point numbers that comprise the RGBA color of the texture border. Floating-point values are returned in the range 0 1 . Integer values are returned as a linear mapping of the internal floating-point representation such that 1.0 maps to the most positive representable integer and -1.0 maps to the most negative representable integer. The initial value is (0, 0, 0, 0).
GL_TEXTURE_PRIORITY: Returns the residence priority of the target texture (or the named texture bound to it). The initial value is 1. See glPrioritizeTextures.
GL_TEXTURE_RESIDENT: Returns the residence status of the target texture. If the value returned in params is GL_TRUE, the texture is resident in texture memory. See glAreTexturesResident.
GL_TEXTURE_COMPARE_MODE: Returns a single-valued texture comparison mode, a symbolic constant. The initial value is GL_NONE. See glTexParameter.
GL_TEXTURE_COMPARE_FUNC: Returns a single-valued texture comparison function, a symbolic constant. The initial value is GL_LEQUAL. See glTexParameter.
GL_DEPTH_TEXTURE_MODE: Returns a single-valued texture format indicating how the depth values should be converted into color components. The initial value is GL_LUMINANCE. See glTexParameter.
GL_GENERATE_MIPMAP: Returns a single boolean value indicating if automatic mipmap level updates are enabled. See glTexParameter.

Notes

GL_TEXTURE_PRIORITY and GL_TEXTURE_RESIDENT are available only if the GL version is 1.1 or greater.

GL_TEXTURE_3D, GL_TEXTURE_MIN_LOD, GL_TEXTURE_MAX_LOD, GL_TEXTURE_BASE_LEVEL, GL_TEXTURE_MAX_LEVEL, and GL_TEXTURE_WRAP_R are available only if the GL version is 1.2 or greater.

GL_TEXTURE_COMPARE_MODE, GL_TEXTURE_COMPARE_FUNC, and GL_GENERATE_MIPMAP is available only if the GL version is 1.4 or greater.

If an error is generated, no change is made to the contents of params.

Errors

GL_INVALID_ENUM is generated if target or pname is not an accepted value.

GL_INVALID_OPERATION is generated if glGetTexParameter is executed between the execution of glBegin and the corresponding execution of glEnd.