GL 3.0:
GLSL changes (GL_EXT_gpu_shader4, etc) not started
-Conditional rendering (GL_NV_conditional_render) DONE (swrast only)
+Conditional rendering (GL_NV_conditional_render) DONE (swrast & softpipe)
Map buffer subranges (GL_APPLE_flush_buffer_range) not started
Float textures, renderbuffers some infrastructure done
Framebuffer objects (GL_EXT_framebuffer_object) DONE
Half-float some infrastructure done
Multisample blit DONE
Non-normalized Integer texture/framebuffer formats not started
-1D/2D Texture arrays mostly done
+1D/2D Texture arrays core Mesa, swrast done
Packed depth/stencil formats DONE
Per-buffer blend and masks (GL_EXT_draw_buffers2) DONE
GL_EXT_texture_compression_rgtc not started
sRGB framebuffer format (GL_EXT_framebuffer_sRGB) not started
glClearBuffer commands DONE, except for dispatch
glGetStringi command DONE, except for dispatch
+glTexParameterI, glGetTexParameterI commands DONE, except for dispatch
+glVertexAttribI commands not started
+glBindFragDataLocation, glGetFragDataLocation cmds not started
+glBindBufferRange, glBindBufferBase commands not started
GL 3.1:
Fence objects (GL_ARB_sync) DONE
+
+More info about these features and the work involved can be found at
+http://dri.freedesktop.org/wiki/MissingFunctionality