1GL_ARB_enhanced_layouts 2http://www.opengl.org/registry/specs/ARB/enhanced_layouts.txt 3GL_ARB_enhanced_layouts 4 5 GL_LOCATION_COMPONENT 0x934A 6 GL_TRANSFORM_FEEDBACK_BUFFER_INDEX 0x934B 7 GL_TRANSFORM_FEEDBACK_BUFFER_STRIDE 0x934C 8