src/gallium/drivers/i915/TODO

   1 Random list of problems with i915g:
   2
   3 - What does this button do? Figure out LIS7 with regards to depth offset.
   4
   5 - Dies with BadDrawable on GLXFBconfig changes/destruction. Makes piglit totally
   6   unusable :( Upgrading xserver helped here, it doesn't crash anymore. Still
   7   broken, it doesn't update the viewport/get new buffers.
   8
   9 - Y-tiling is even more fun. i915c doesn't use it, maybe there's a reason?
  10   Texture sampling from Y-tiled buffers seems to work, though (save above
  11   problems).
  12   RESOLVED: Y-tiling works with the render engine, but not with the blitter.
  13   Use u_blitter and hw clears (PRIM3D_CLEAR_RECT).
  14
  15 - src/xvmc/i915_structs.h in xf86-video-intel has a few more bits of various
  16   commands defined. Scavenge them and see what's useful.
  17
  18 - Do smarter remapping. Right now we send everything onto tex coords 0-7.
  19   We could also use diffuse/specular and pack two sets of 2D coords in a single
  20   4D. Is it a big problem though? We're more limited by the # of texture
  21   indirections and the # of instructions.
  22
  23 - Finish front/back face. We need to add face support to lp_build_system_values_array and use it in draw_llvm.c.
  24
  25 - More optimizations, like replacing ADD + MUL with MAD or use DP2ADD.
  26
  27 - Replace constants and immediates which are 0,1,-1 or a combination of those with a swizzle.
  28
  29 - Schedule instructions to minimize the number of phases. One way is to replace
  30   R registers responsible for a boundary with U registers to avoid phase
  31   boundaries.
  32
  33 - Continue a previous primitive when there are no state changes
  34
  35 - Fix fragment discard
  36
  37 Other bugs can be found here:
  38 https://gitlab.freedesktop.org/mesa/mesa/-/issues?scope=all&utf8=%E2%9C%93&state=opened&label_name[]=i915g