iPhone对OpenGL ES的支持程度！
GLBenchMark的结果：
http://www.glbenchmark.com/phonedetails.jsp?benchmark=pro&D=Apple%20iPhone&testgroup=gl
这个很重要，复制一份，以备不时之需：
| OpenGL ES Environment Variables | |
| GL_VENDOR | Imagination Technologies |
| GL_VERSION | OpenGL ES-CM 1.1 |
| GL_RENDERER | PowerVR MBXLite with VGPLite |
| GL_EXTENSIONS | GL_OES_byte_coordinates GL_OES_compressed_paletted_texture GL_OES_fixed_point GL_OES_point_size_array GL_OES_point_sprite GL_OES_read_format GL_OES_single_precision GL_ARB_texture_env_combine GL_ARB_texture_env_dot3 GL_OES_draw_texture GL_IMG_texture_format_BGRA8888 GL_APPLE_texture_rectangle GL_APPLE_client_storage |
| GL_RED_BITS | 8 |
| GL_GREEN_BITS | 8 |
| GL_BLUE_BITS | 8 |
| GL_ALPHA_BITS | 8 |
| GL_DEPTH_BITS | 24 |
| GL_STENCIL_BITS | 0 |
| GL_SUBPIXEL_BITS | 4 |
| GL_MAX_LIGHTS | 8 |
| GL_IMPLEMENTATION_COLOR_READ_FORMAT_OES | 6408 |
| GL_IMPLEMENTATION_COLOR_READ_TYPE_OES | 5121 |
| GL_MAX_CLIP_PLANES | 1 |
| GL_MAX_MODELVIEW_STACK_DEPTH | 16 |
| GL_MAX_TEXTURE_STACK_DEPTH | 4 |
| GL_MAX_PROJECTION_STACK_DEPTH | 2 |
| GL_MAX_TEXTURE_SIZE | 2048 |
| GL_MAX_TEXTURE_UNITS | 2 |
| GL_MAX_VIEWPORT_WIDTH | 2048 |
| GL_MAX_VIEWPORT_HEIGHT | 1024 |
| GL_NUM_COMPRESSED_TEXTURE_FORMATS | 14 |
| GL_ALIASED_LINE_WIDTH_MIN | 1 |
| GL_ALIASED_LINE_WIDTH_MAX | 32 |
| GL_ALIASED_POINT_SIZE_MIN | 1 |
| GL_ALIASED_POINT_SIZE_MAX | 32 |
| GL_SMOOTH_LINE_WIDTH_MIN | 1 |
| GL_SMOOTH_LINE_WIDTH_MAX | 1 |
| GL_SMOOTH_POINT_SIZE_MIN | 1 |
| GL_SMOOTH_POINT_SIZE_MAX | 1 |
| EGL Native Platform Graphics Interface | |||||||||||||||||||||||||||||||||||||||||||||||
| EGL Vendor | Imagination Technologies | ||||||||||||||||||||||||||||||||||||||||||||||
| EGL Version | 1.1 build 1 | ||||||||||||||||||||||||||||||||||||||||||||||
| EGL Extensions | EGL_IMG_power_management | ||||||||||||||||||||||||||||||||||||||||||||||
| EGL Selected Configuration |
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