HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 220

G glGetTexLevelParameter pname specifies the texture parameter whose value or values will be returned. The accepted parameter names are as follows: GL_TEXTURE_WIDTH params returns a single value, the width of the texture image. This value includes the border of the texture image. The initial value is 0. GL_TEXTURE_HEIGHT params returns a single value, the height of the texture image. This value includes the border of the texture image. The initial value is 0. GL_TEXTURE_INTERNAL_FORMAT params returns a single value, the internal format of the texture image. GL_TEXTURE_BORDER params returns a single value, the width in pixels of the border of the texture image. The initial value is 0. GL_TEXTURE_RED_SIZE,GL_TEXTURE_GREEN_SIZE, GL_TEXTURE_BLUE_SIZE, GL_TEXTURE_ALPHA_SIZE, GL_TEXTURE_LUMINANCE_SIZE, and GL_TEXTURE_INTENSITY_SIZE The internal storage resolution of an individual component. The resolution chosen by the GL will be a close match for the resolution requested by the user with the component argument of glTexImage1D or glTexImage2D. The initial value is 0. Notes If an error is generated, no change is made to the contents of params. GL_TEXTURE_INTERNAL_FORMAT is only available if the GL version is 1.1 or greater. In version 1.0, use GL_TEXTURE_COMPONENTS instead. GL_PROXY_TEXTURE_1D and GL_PROXY_TEXTURE_2D are only available if the GL version is 1.1 or greater. Errors • GL_INVALID_ENUM is generated if target or pname is not an accepted value. • GL_INVALID_VALUE is generated if level is less than 0. • GL_INVALID_VALUE may be generated if level is greater than $ log sub 2$ max, where max is the returned value of GL_MAX_TEXTURE_SIZE. • GL_INVALID_OPERATION is generated if glGetTexLevelParameter is executed between the execution of glBegin and the corresponding execution of glEnd. See Also glGetTexParameter, glCopyTexImage1D, glCopyTexImage2D, glCopyTexSubImage1D, glCopyTexSubImage2D, 220 Chapter 7