GL_NV_fence http://www.opengl.org/registry/specs/NV/fence.txt GL_NV_fence GL_ALL_COMPLETED_NV 0x84F2 GL_FENCE_STATUS_NV 0x84F3 GL_FENCE_CONDITION_NV 0x84F4 void glDeleteFencesNV (GLsizei n, const GLuint* fences) void glFinishFenceNV (GLuint fence) void glGenFencesNV (GLsizei n, GLuint* fences) void glGetFenceivNV (GLuint fence, GLenum pname, GLint* params) GLboolean glIsFenceNV (GLuint fence) void glSetFenceNV (GLuint fence, GLenum condition) GLboolean glTestFenceNV (GLuint fence)