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iris: Add and use convert_depth_value 

Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7410>
This commit is contained in:
Nanley Chery 2020-10-19 15:31:24 -07:00 committed by Marge Bot
parent 2e713313a2
commit 667813431c
1 changed files with 18 additions and 10 deletions
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28
src/gallium/drivers/iris/iris_clear.c
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@ -440,6 +440,23 @@ can_fast_clear_depth(struct iris_context *ice,
box->y + box->height);
}
static float
convert_depth_value(enum pipe_format format, double depth)
{
/* Quantize the clear value to what can be stored in the actual depth
* buffer. This makes checking for changes more accurate because the actual
* depth bits are compared. It also prevents us from getting a too-accurate
* depth value during depth testing or when sampling with HiZ enabled.
*/
if (format == PIPE_FORMAT_Z32_FLOAT) {
return depth;
} else {
const unsigned nbits = format == PIPE_FORMAT_Z16_UNORM ? 16 : 24;
const uint32_t depth_max = (1 << nbits) - 1;
return (unsigned)(depth * depth_max) / (float)depth_max;
}
}
static void
fast_clear_depth(struct iris_context *ice,
struct iris_resource *res,
@ -450,16 +467,7 @@ fast_clear_depth(struct iris_context *ice,
struct pipe_resource *p_res = (void *) res;
struct iris_batch *batch = &ice->batches[IRIS_BATCH_RENDER];
/* Quantize the clear value to what can be stored in the actual depth
* buffer. This makes the following check more accurate because it now
* checks if the actual depth bits will match. It also prevents us from
* getting a too-accurate depth value during depth testing or when sampling
* with HiZ enabled.
*/
const unsigned nbits = p_res->format == PIPE_FORMAT_Z16_UNORM ? 16 : 24;
const uint32_t depth_max = (1 << nbits) - 1;
depth = p_res->format == PIPE_FORMAT_Z32_FLOAT ? depth :
(unsigned)(depth * depth_max) / (float)depth_max;
depth = convert_depth_value(p_res->format, depth);
bool update_clear_depth = false;