Mesa's OpenGL 3.0 TODO List Is Becoming Smaller
Via a commit to the TODO list concerning Mesa's support for the OpenGL 3.0 specification, Marek Olšák has confirmed that vertex texture image units for OGL3 are "DONE" and working on the R600 Gallium3D driver.
The OpenGL 3.0 target is actually getting shockingly close to completion. According to their TODO list, all that's left is completing the GLSL 1.30 (GL Shading Language) work, float-depth buffers, non-normalized Integer texture/frame-buffer formats, 1D/2D texture arrays, transform feedback, sRGB frame-buffer format, and depth-format cube textures. Of those outstanding action items, some items like 1D/2D texture arrays is setup within core Mesa and the software rasterizer, but isn't yet implemented by the hardware drivers.
The only items for attaining OpenGL 3.0 support that haven't been worked on at all are the float-depth buffers and depth format cube textures. Likely the biggest work item to achieve though is the proper GL Shading Language 1.30 support. Working a bit towards the GLSL 1.30 milestone is the GLSL IR to TGSI direct translator, which adds native integer support, but the Gallium3D drivers need to support the proper TGSI opcode.
Here's what the official OpenGL 3.0 TODO list looks like as of this afternoon:
GLSL 1.30 (GL_EXT_gpu_shader4, etc.) started
When all of those items are marked as being done, it will be released as Mesa 8.0. This could end up being the next release rather than Mesa 7.12 if the developers and community are able to nail in the final bits of OpenGL 3.0 / GLSL 1.30 support over the next six months.
While it will be good to finally see open-source driver support for the OpenGL 3.0 specification, by the time it's here, the Khronos Group specification will have been nearly five years old. The proprietary ATI/AMD and NVIDIA graphics drivers on Linux have meanwhile supported GL3 from nearly the start.
Beyond OpenGL 3.0, there's already 3.1/3.2/3.3 and even OpenGL 4.0/4.1 to additionally address. Several of the work items for OpenGL 3.1/3.2 compliance have been addressed, with the main 3.1 items left being texture buffer objects, uniform buffer objects, and GLSL 1.40 support. Six of the nine OpenGL 3.1 items are already marked as done.
With OpenGL 3.2, seven of the 11 items are "DONE", but the items that are untouched include the core/compatibility profiles, GLSL 1.50, and multi-sample textures. For OpenGL 3.3, 4.0, and 4.1 the burden is much greater and it's unlikely we'll see such support within the next year or two, unless some vendor(s) dramatically step-up their efforts.
The GL3/GL4 TODO list is available from the Mesa Git tree.
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