glGetTexParameter - return texture parameter values
void glGetTexParameterfv(GLenum target,
GLenum pname,
GLfloat * params);
void glGetTexParameteriv(GLenum target,
GLenum pname,
GLint * params);
target
Specifies the symbolic name of the target texture.
GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_1D_ARRAY,
GL_TEXTURE_2D_ARRAY, GL_TEXTURE_3D, GL_TEXTURE_RECTANGLE,
and GL_TEXTURE_CUBE_MAP are accepted.
pname
Specifies the symbolic name of a texture parameter.
GL_TEXTURE_BASE_LEVEL, GL_TEXTURE_BORDER_COLOR,
GL_TEXTURE_COMPARE_MODE, GL_TEXTURE_COMPARE_FUNC,
GL_TEXTURE_LOD_BIAS, GL_TEXTURE_MAG_FILTER,
GL_TEXTURE_MAX_LEVEL, GL_TEXTURE_MAX_LOD,
GL_TEXTURE_MIN_FILTER, GL_TEXTURE_MIN_LOD,
GL_TEXTURE_SWIZZLE_R, GL_TEXTURE_SWIZZLE_G,
GL_TEXTURE_SWIZZLE_B, GL_TEXTURE_SWIZZLE_A,
GL_TEXTURE_SWIZZLE_RGBA, GL_TEXTURE_WRAP_S,
GL_TEXTURE_WRAP_T, and GL_TEXTURE_WRAP_R 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. GL_TEXTURE_1D, GL_TEXTURE_2D,
GL_TEXTURE_3D, GL_TEXTURE_1D_ARRAY,
GL_TEXTURE_2D_ARRAY, GL_TEXTURE_RECTANGLE, and
GL_TEXTURE_CUBE_MAP specify one-, two-, or three-dimensional,
one-dimensional array, two-dimensional array, rectangle or cube-mapped
texturing, respectively. 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_SWIZZLE_R
Returns the red component swizzle. The initial value is
GL_RED.
GL_TEXTURE_SWIZZLE_G
Returns the green component swizzle. The initial value is
GL_GREEN.
GL_TEXTURE_SWIZZLE_B
Returns the blue component swizzle. The initial value is
GL_BLUE.
GL_TEXTURE_SWIZZLE_A
Returns the alpha component swizzle. The initial value is
GL_ALPHA.
GL_TEXTURE_SWIZZLE_RGBA
Returns the component swizzle for all channels in a
single query.
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_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().
If an error is generated, no change is made to the contents of
params.
GL_INVALID_ENUM is generated if target or
pname is not an accepted value.
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© 2010 Khronos Group. This document is licensed under the SGI Free
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