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i965: Only set key->high_quality_derivatives when it matters.

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This avoids recompiles for shaders that don't use explicit derivatives
when ctx->Hint.FragmentShaderDerivative == GL_NICEST.

For example, GFXBench 5 Aztec Ruins sets the GL_NICEST hint before
compiling any shaders, but none of them use dFdx() or dFdy() - only
implicit derivatives.  This doesn't eliminate any recompiles, but
does eliminate one of the reasons for doing so.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Kenneth Graunke 2017-10-26 15:22:45 -07:00
parent 86c68bb886
commit 992e2cf57f
1 changed files with 1 additions and 0 deletions
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src/mesa/drivers/dri/i965/brw_wm.c
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@ -521,6 +521,7 @@ brw_wm_populate_key(struct brw_context *brw, struct brw_wm_prog_key *key)
/* _NEW_HINT */
key->high_quality_derivatives =
prog->info.uses_fddx_fddy &&
ctx->Hint.FragmentShaderDerivative == GL_NICEST;
if (devinfo->gen < 6)