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
+ (incl. GL_EXT_packed_float, GL_EXT_shared_exponent)
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
Red and red/green texture formats Ian?
-Transform feedback (GL_EXT_transform_feedback) not started
+Transform feedback (GL_EXT_transform_feedback) ~50% done
Vertex array objects (GL_APPLE_vertex_array_object) DONE
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:
GLSL 1.30 and 1.40 not started
-Instanced drawing (GL_ARB_draw_instanced) not started
+Instanced drawing (GL_ARB_draw_instanced) ~50% done
Buffer copying (GL_ARB_copy_buffer) DONE
Primitive restart (GL_NV_primitive_restart) not started
16 vertex texture image units not started
Geometry shaders (GL_ARB_geometry_shader4) partially done (Zack)
BGRA vertex order (GL_ARB_vertex_array_bgra) DONE
Base vertex offset(GL_ARB_draw_elements_base_vertex) DONE
-Frag shader coord (GL_ARB_fragment_coord_conventions) not started
+Frag shader coord (GL_ARB_fragment_coord_conventions) DONE (swrast, gallium)
Provoking vertex (GL_ARB_provoking_vertex) DONE
Seamless cubemaps (GL_ARB_seamless_cube_map) DONE, mostly?
Multisample textures (GL_ARB_texture_multisample) not started
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