glGetTexParameter Subroutine

OpenGL 1.1 for AIX: Reference Manual

glGetTexParameter Subroutine

Purpose

Returns texture parameter values.

Library

OpenGL C bindings library: libGL.a

C Syntax

void glGetTexParameterfv(GLenum Target,
           GLenum ParameterName, 
           GLfloat *ParameterValues)

void glGetTexParameteriv(GLenum Target,
           GLenum ParameterName, 
           GLint *ParameterValues)

Parameters

Target	Specifies the symbolic name of the target texture. GL_TEXTURE_1D, GL_TEXTURE_2D, and GL_TEXTURE_3D_EXT (EXT_texture_3D) are accepted.
ParameterName	Specifies the symbolic name of a texture parameter. GL_TEXTURE_MAG_FILTER, GL_TEXTURE_MIN_FILTER, GL_TEXTURE_PRIORITY, GL_TEXTURE_PRIORITY_EXT, GL_TEXTURE_RESIDENT, GL_TEXTURE_RESIDENT_EXT, GL_TEXTURE_WRAP_R_EXT, GL_TEXTURE_WRAP_S, GL_TEXTURE_WRAP_T, and GL_TEXTURE_BORDER_COLOR are accepted.
ParameterValues	Returns the texture parameters.

Description

The glGetTexParameter subroutine returns in ParameterValues the value or values of the texture parameter specified as ParameterName. Target defines the target texture, either GL_TEXTURE_1D, GL_TEXTURE_2D, and GL_TEXTURE_3D_EXT (if the 3D texture extension is supported). ParameterName accepts the same symbols as glTexParameter, with the same interpretations:

GL_TEXTURE_BORDER_COLOR	Returns four integer or floating-point numbers that comprise the red, green, blue, alpha (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.
GL_TEXTURE_MAG_FILTER	Returns the single-valued texture magnification filter, a symbolic constant.
GL_TEXTURE_MIN_FILTER	Returns the single-valued texture minification filter, a symbolic constant.
GL_TEXTURE_PRIORITY (1.1 only)
GL_TEXTURE_PRIORITY_EXT (EXT_texture_object)
	Returns the priority of the target texture (or the named texture bound to it). The initial value is 1. See glPrioritizeTextures.
GL_TEXTURE_RESIDENT (1.1 only)
GL_TEXTURE_RESIDENT_EXT (EXT_texture_object)
	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_WRAP_R (EXT_texture_3D)	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.
GL_TEXTURE_WRAP_T	Returns the single-valued wrapping function for texture coordinate t, a symbolic constant.

Notes

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

Errors

GL_INVALID_ENUM	Either Target or ParameterName is not an accepted value.
GL_INVALID_OPERATION	The glGetTexParameter subroutine is called between a call to glBegin and the corresponding call to glEnd.

Files

/usr/include/GL/gl.h

Contains C language constants, variable type definitions, and ANSI function prototypes for OpenGL.

Related Information

The glBegin or glEnd subroutine, glTexParameter subroutine.

OpenGL Overview.