1991-2006 Silicon Graphics, Inc. glGetTexEnv 3G glGetTexEnv return texture environment parameters void glGetTexEnvfv GLenum target GLenum pname GLfloat * params void glGetTexEnviv GLenum target GLenum pname GLint * params target Specifies a texture environment. May be GL_TEXTURE_ENV, GL_TEXTURE_FILTER_CONTROL, or GL_POINT_SPRITE. pname Specifies the symbolic name of a texture environment parameter. Accepted values are GL_TEXTURE_ENV_MODE, GL_TEXTURE_ENV_COLOR, GL_TEXTURE_LOD_BIAS, GL_COMBINE_RGB, GL_COMBINE_ALPHA, GL_SRC0_RGB, GL_SRC1_RGB, GL_SRC2_RGB, GL_SRC0_ALPHA, GL_SRC1_ALPHA, GL_SRC2_ALPHA, GL_OPERAND0_RGB, GL_OPERAND1_RGB, GL_OPERAND2_RGB, GL_OPERAND0_ALPHA, GL_OPERAND1_ALPHA, GL_OPERAND2_ALPHA, GL_RGB_SCALE, GL_ALPHA_SCALE, or GL_COORD_REPLACE. params Returns the requested data. glGetTexEnv returns in params selected values of a texture environment that was specified with glTexEnv. target specifies a texture environment. When target is GL_TEXTURE_FILTER_CONTROL, pname must be GL_TEXTURE_LOD_BIAS. When target is GL_POINT_SPRITE, pname must be GL_COORD_REPLACE. When target is GL_TEXTURE_ENV, pname can be GL_TEXTURE_ENV_MODE, GL_TEXTURE_ENV_COLOR, GL_COMBINE_RGB, GL_COMBINE_ALPHA, GL_RGB_SCALE, GL_ALPHA_SCALE, GL_SRC0_RGB, GL_SRC1_RGB, GL_SRC2_RGB, GL_SRC0_ALPHA, GL_SRC1_ALPHA, or GL_SRC2_ALPHA. pname names a specific texture environment parameter, as follows: GL_TEXTURE_ENV_MODE params returns the single-valued texture environment mode, a symbolic constant. The initial value is GL_MODULATE. GL_TEXTURE_ENV_COLOR params returns four integer or floating-point values that are the texture environment color. Integer values, when requested, are linearly mapped from 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_LOD_BIAS params returns a single floating-point value that is the texture level-of-detail bias. The initial value is 0. GL_COMBINE_RGB params returns a single symbolic constant value representing the current RGB combine mode. The initial value is GL_MODULATE. GL_COMBINE_ALPHA params returns a single symbolic constant value representing the current alpha combine mode. The initial value is GL_MODULATE. GL_SRC0_RGB params returns a single symbolic constant value representing the texture combiner zero's RGB source. The initial value is GL_TEXTURE. GL_SRC1_RGB params returns a single symbolic constant value representing the texture combiner one's RGB source. The initial value is GL_PREVIOUS. GL_SRC2_RGB params returns a single symbolic constant value representing the texture combiner two's RGB source. The initial value is GL_CONSTANT. GL_SRC0_ALPHA params returns a single symbolic constant value representing the texture combiner zero's alpha source. The initial value is GL_TEXTURE. GL_SRC1_ALPHA params returns a single symbolic constant value representing the texture combiner one's alpha source. The initial value is GL_PREVIOUS. GL_SRC2_ALPHA params returns a single symbolic constant value representing the texture combiner two's alpha source. The initial value is GL_CONSTANT. GL_OPERAND0_RGB params returns a single symbolic constant value representing the texture combiner zero's RGB operand. The initial value is GL_SRC_COLOR. GL_OPERAND1_RGB params returns a single symbolic constant value representing the texture combiner one's RGB operand. The initial value is GL_SRC_COLOR. GL_OPERAND2_RGB params returns a single symbolic constant value representing the texture combiner two's RGB operand. The initial value is GL_SRC_ALPHA. GL_OPERAND0_ALPHA params returns a single symbolic constant value representing the texture combiner zero's alpha operand. The initial value is GL_SRC_ALPHA. GL_OPERAND1_ALPHA params returns a single symbolic constant value representing the texture combiner one's alpha operand. The initial value is GL_SRC_ALPHA. GL_OPERAND2_ALPHA params returns a single symbolic constant value representing the texture combiner two's alpha operand. The initial value is GL_SRC_ALPHA. GL_RGB_SCALE params returns a single floating-point value representing the current RGB texture combiner scaling factor. The initial value is 1.0. GL_ALPHA_SCALE params returns a single floating-point value representing the current alpha texture combiner scaling factor. The initial value is 1.0. GL_COORD_REPLACE params returns a single boolean value representing the current point sprite texture coordinate replacement enable state. The initial value is GL_FALSE. If an error is generated, no change is made to the contents of params. For OpenGL versions 1.3 and greater, or when the ARB_multitexture extension is supported, glGetTexEnv returns the texture environment parameters for the active texture unit. GL_COMBINE_RGB, GL_COMBINE_ALPHA, GL_SRC0_RGB, GL_SRC1_RGB, GL_SRC2_RGB, GL_SRC0_ALPHA, GL_SRC1_ALPHA, GL_SRC2_ALPHA, GL_OPERAND0_RGB, GL_OPERAND1_RGB, GL_OPERAND2_RGB, GL_OPERAND0_ALPHA, GL_OPERAND1_ALPHA, GL_OPERAND2_ALPHA, GL_RGB_SCALE, and GL_ALPHA_SCALE are available only if the GL version is 1.3 or greater. GL_TEXTURE_FILTER_CONTROL and GL_TEXTURE_LOD_BIAS are available only if the GL version is 1.4 or greater. GL_POINT_SPRITE and GL_COORD_REPLACE are available only if the GL version is 2.0 or greater. GL_INVALID_ENUM is generated if target or pname is not an accepted value. GL_INVALID_OPERATION is generated if glGetTexEnv is executed between the execution of glBegin and the corresponding execution of glEnd. glActiveTexture, glTexEnv Copyright 1991-2006 Silicon Graphics, Inc. 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