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i965: Flip the non-coherent framebuffer fetch extension bit on G45-Gen8 hardware.

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This is not enabled on the original Gen4 part because it lacks surface
state tile offsets so it may not be possible to sample from arbitrary
non-zero layers of the framebuffer depending on the miptree layout (it
should be possible to work around this by allocating a scratch surface
and doing the same hack currently used for render targets, but meh...).

On Gen9+ even though it should mostly work (feel free to force-enable
it in order to compare the coherent and non-coherent paths in terms of
performance), there are some corner cases like 1D array layered
framebuffers that cannot be handled easily by the non-coherent path
because of the incompatible layout in memory of 1D and 2D miptrees (it
should be possible to work around this too by doing state-dependent
recompiles, but it's hard to care enough since Gen9 has native support
for coherent render target reads...)

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Francisco Jerez 2016-07-19 15:23:30 -07:00
parent ecc4800383
commit 8a2f19a777
1 changed files with 3 additions and 0 deletions
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3
src/mesa/drivers/dri/i965/intel_extensions.c
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@ -281,6 +281,9 @@ intelInitExtensions(struct gl_context *ctx)
ctx->Extensions.EXT_shader_integer_mix = ctx->Const.GLSLVersion >= 130;
ctx->Extensions.MESA_shader_integer_functions = ctx->Const.GLSLVersion >= 130;
if ((brw->is_g4x || brw->gen >= 5) && brw->gen < 9)
ctx->Extensions.MESA_shader_framebuffer_fetch_non_coherent = true;
if (brw->gen >= 5) {
ctx->Extensions.ARB_texture_query_levels = ctx->Const.GLSLVersion >= 130;
ctx->Extensions.ARB_texture_query_lod = true;