GL_ARB_clear_texture
https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_clear_texture.txt
GL_ARB_clear_texture

	GL_CLEAR_TEXTURE 0x9365
	void glClearTexImage (GLuint texture, GLint level, GLenum format, GLenum type, const void *data)
	void glClearTexSubImage (GLuint texture, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, const void *data)