1GL_NV_depth_buffer_float
2http://developer.download.nvidia.com/opengl/specs/GL_NV_depth_buffer_float.txt
3GL_NV_depth_buffer_float
4
5	GL_DEPTH_COMPONENT32F_NV 0x8DAB
6	GL_DEPTH32F_STENCIL8_NV 0x8DAC
7	GL_FLOAT_32_UNSIGNED_INT_24_8_REV_NV 0x8DAD
8	GL_DEPTH_BUFFER_FLOAT_MODE_NV 0x8DAF
9	void glDepthRangedNV (GLdouble zNear, GLdouble zFar)
10	void glClearDepthdNV (GLdouble depth)
11	void glDepthBoundsdNV (GLdouble zmin, GLdouble zmax)
12