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iris: Add a more long term TODO about timebase scaling

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This commit is contained in:
Kenneth Graunke 2018-12-14 00:51:00 -08:00
parent 7ddc1f8ded
commit 3ab3aa23c2
1 changed files with 6 additions and 0 deletions
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6
src/gallium/drivers/iris/iris_query.c
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@ -623,10 +623,15 @@ calculate_result_on_gpu(struct iris_context *ice, struct iris_query *q)
if (q->type == PIPE_QUERY_TIMESTAMP) {
ice->vtbl.load_register_mem64(batch, CS_GPR(0), q->bo,
offsetof(struct iris_query_snapshots, start));
/* TODO: This discards any fractional bits of the timebase scale.
* We would need to do a bit of fixed point math on the CS ALU, or
* launch an actual shader to calculate this with full precision.
*/
emit_mul_gpr0(batch, (1000000000ull / screen->devinfo.timestamp_frequency));
keep_gpr0_lower_n_bits(ice, 36);
return;
}
ice->vtbl.load_register_mem64(batch, CS_GPR(1), q->bo,
offsetof(struct iris_query_snapshots, start));
ice->vtbl.load_register_mem64(batch, CS_GPR(2), q->bo,
@ -646,6 +651,7 @@ calculate_result_on_gpu(struct iris_context *ice, struct iris_query *q)
gpr0_to_bool(ice);
if (q->type == PIPE_QUERY_TIME_ELAPSED) {
/* TODO: This discards fractional bits (see above). */
emit_mul_gpr0(batch, (1000000000ull / screen->devinfo.timestamp_frequency));
}
}