HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 219

Chapter 7 G glGetTexLevelParameter glGetTexLevelParameter glGetTexLevelParameterfv, glGetTexLevelParameteriv: return texture parameter values for a specific level of detail. C Specification void glGetTexLevelParameterfv( GLenum target, GLint level, GLenum pname GLfloat *params) void glGetTexLevelParameteriv( GLenum target, GLint level, GLenum pname, GLint *params) Parameters target level pname params Specifies the symbolic name of the target texture, either GL_TEXTURE_1D, GL_TEXTURE_2D, GL_PROXY_TEXTURE_1D, or GL_PROXY_TEXTURE_2D. Specifies the level-of-detail number of the desired image. Level 0 is the base image level. Level n is the nth mipmap reduction image. Specifies the symbolic name of a texture parameter. GL_TEXTURE_WIDTH, GL_TEXTURE_HEIGHT, GL_TEXTURE_INTERNAL_FORMAT, GL_TEXTURE_BORDER, 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 are accepted. Returns the requested data. Description glGetTexLevelParameter returns in params texture parameter values for a specific level-of-detail value, specified as level. target defines the target texture, either GL_TEXTURE_1D, GL_TEXTURE_2D, GL_PROXY_TEXTURE_1D, or GL_PROXY_TEXTURE_2D. GL_MAX_TEXTURE_SIZE is not really descriptive enough. It has to report the largest square texture image that can be accommodated with mipmaps and borders, but a long skinny texture, or a texture without mipmaps and borders, may easily fit in texture memory. The proxy targets allow the user to more accurately query whether the GL can accommodate a texture of a given configuration. If the texture cannot be accommodated, the texture state variables, which may be queried with glGetTexLevelParameter, are set to 0. If the texture can be accommodated, the texture state values will be set as they would be set for a non-proxy target. 219