    {-# LANGUAGE ForeignFunctionInterface, CPP #-}
    --------------------------------------------------------------------------------
    -- |
    -- Module      :  Graphics.Rendering.OpenGL.Raw.NV.OcclusionQuery
    -- Copyright   :  (c) Sven Panne 2009
    -- License     :  BSD-style (see the file LICENSE)
    --
    -- Maintainer  :  sven.panne@aedion.de
    -- Stability   :  stable
    -- Portability :  portable
    --
    -- All raw functions and tokens from the NV_occlusion_query not already in the
    -- OpenGL 3.1 core, see
    -- <http://www.opengl.org/registry/specs/NV/occlusion_query.txt>.
    --
    --------------------------------------------------------------------------------

    module Graphics.Rendering.OpenGL.Raw.NV.OcclusionQuery (
       -- * Functions
       glGenOcclusionQueries,
       glDeleteOcclusionQueries,
       glIsOcclusionQuery,
       glBeginOcclusionQuery,
       glEndOcclusionQuery,
       glGetOcclusionQueryiv,
       glGetOcclusionQueryuiv,
       -- * Tokens
       gl_OCCLUSION_TEST,
       gl_OCCLUSION_TEST_RESULT,
       gl_PIXEL_COUNTER_BITS,
       gl_CURRENT_OCCLUSION_QUERY_ID,
       gl_PIXEL_COUNT,
       gl_PIXEL_COUNT_AVAILABLE
    ) where

    import Foreign.Ptr
    import Foreign.C.Types
    import Graphics.Rendering.OpenGL.Raw.Core31.Types
    import Graphics.Rendering.OpenGL.Raw.Extensions

    #include "HsOpenGLRaw.h"

    extensionNameString :: String
    extensionNameString = "GL_NV_occlusion_query"

    EXTENSION_ENTRY(glGenOcclusionQueries,GLsizei -> Ptr GLuint -> IO ())
    EXTENSION_ENTRY(glDeleteOcclusionQueries,GLsizei -> Ptr GLuint -> IO ())
    EXTENSION_ENTRY(glIsOcclusionQuery,GLuint -> IO ())
    EXTENSION_ENTRY(glBeginOcclusionQuery,GLuint -> IO ())
    EXTENSION_ENTRY(glEndOcclusionQuery,IO ())
    EXTENSION_ENTRY(glGetOcclusionQueryiv,GLuint -> GLenum -> Ptr GLint -> IO ())
    EXTENSION_ENTRY(glGetOcclusionQueryuiv,GLuint -> GLenum -> Ptr GLuint -> IO ())

    gl_OCCLUSION_TEST :: GLenum
    gl_OCCLUSION_TEST = 0x8165

    gl_OCCLUSION_TEST_RESULT :: GLenum
    gl_OCCLUSION_TEST_RESULT = 0x8166

    gl_PIXEL_COUNTER_BITS :: GLenum
    gl_PIXEL_COUNTER_BITS = 0x8864

    gl_CURRENT_OCCLUSION_QUERY_ID :: GLenum
    gl_CURRENT_OCCLUSION_QUERY_ID = 0x8865

    gl_PIXEL_COUNT :: GLenum
    gl_PIXEL_COUNT = 0x8866

    gl_PIXEL_COUNT_AVAILABLE :: GLenum
    gl_PIXEL_COUNT_AVAILABLE = 0x8867