glGetTexParameter

glGetTexParameterfv, glGetTexParameteriv: 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, and GL_TEXTURE_3D_EXT are accepted.
pname: Specifies the symbolic name of a texture parameter. GL_TEXTURE_MAG_FILTER, GL_TEXTURE_MIN_FILTER, GL_TEXTURE_WRAP_R_EXT, GL_TEXTURE_WRAP_S, GL_TEXTURE_WRAP_T, GL_TEXTURE_BORDER_COLOR, GL_TEXTURE_PRIORITY, GL_GENERATE_MIPMAP_EXT, GL_TEXTURE_COMPARE_EXT, GL_TEXTURE_COMPARE_OPERATOR_EXT, and GL_TEXTURE_RESIDENT are accepted.
params: Returns the texture parameters.

glGetTexParameter returns in params the value or values of the texture parameter specified as pname. target defines the target texture, either GL_TEXTURE_1D or GL_TEXTURE_2D, to specify one- or two-dimensional 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_WRAP_R_EXT: Returns the single-valued wrapping function for texture coordinate r, a symbolic constant.
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_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_GENERATE_MIPMAP_EXT: Returns the single-valued flag which determines whether automatic mip level generation is in effect, either GL_TRUE or GL_FALSE.
GL_TEXTURE_COMPARE_EXT: Returns the single-valued flag which determines whether depth texture comparision is enabled, either GL_TRUE or GL_FALSE.
GL_TEXTURE_COMPARE_OPERATOR_EXT: Returns the single-valued depth texture comparision operator, a symbolic constant.
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.

Notes

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

GL_TEXTURE_WRAP_R_EXT and the target GL_TEXTURE_3D_EXT are only supported if the extension GL_EXT_texture3D is supported.

GL_GENERATE_MIPMAP_EXT is only supported if the extension GL_EXT_generate_mipmap is supported.

GL_TEXTURE_COMPARE_EXT and GL_TEXTURE_COMPARE_OPERATOR_EXT are only supported if the extension GL_EXT_shadow is supported.

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.

glGetTexParameter

C Specification

Parameters

Description

Notes

Errors

See Also