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radeonsi: simplify si_get_sample_position 

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Marek Olšák 2018-04-27 22:02:04 -04:00
parent 9f456b3a3c
commit 5769a5ec01
1 changed files with 20 additions and 29 deletions
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49
src/gallium/drivers/radeonsi/si_state_msaa.c
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@ -31,8 +31,17 @@
(((unsigned)(s2x) & 0xf) << 16) | (((unsigned)(s2y) & 0xf) << 20) | \
(((unsigned)(s3x) & 0xf) << 24) | (((unsigned)(s3y) & 0xf) << 28))
/* 2xMSAA
* There are two locations (4, 4), (-4, -4). */
/* For obtaining location coordinates from registers */
#define SEXT4(x) ((int)((x) | ((x) & 0x8 ? 0xfffffff0 : 0)))
#define GET_SFIELD(reg, index) SEXT4(((reg) >> ((index) * 4)) & 0xf)
#define GET_SX(reg, index) GET_SFIELD((reg)[(index) / 4], ((index) % 4) * 2)
#define GET_SY(reg, index) GET_SFIELD((reg)[(index) / 4], ((index) % 4) * 2 + 1)
/* 1x MSAA */
static const uint32_t sample_locs_1x =
FILL_SREG( 0, 0, 0, 0, 0, 0, 0, 0); /* S1, S2, S3 fields are not used by 1x */
/* 2x MSAA */
static const uint32_t sample_locs_2x =
FILL_SREG(4, 4, -4, -4, 0, 0, 0, 0); /* S2 & S3 fields are not used by 2x MSAA */
@ -57,47 +66,29 @@ static const uint32_t sample_locs_16x[] = {
static void si_get_sample_position(struct pipe_context *ctx, unsigned sample_count,
unsigned sample_index, float *out_value)
{
int offset, index;
struct {
int idx:4;
} val;
const uint32_t *sample_locs;
switch (sample_count) {
case 1:
default:
out_value[0] = out_value[1] = 0.5;
sample_locs = &sample_locs_1x;
break;
case 2:
offset = 4 * (sample_index * 2);
val.idx = (sample_locs_2x >> offset) & 0xf;
out_value[0] = (float)(val.idx + 8) / 16.0f;
val.idx = (sample_locs_2x >> (offset + 4)) & 0xf;
out_value[1] = (float)(val.idx + 8) / 16.0f;
sample_locs = &sample_locs_2x;
break;
case 4:
offset = 4 * (sample_index * 2);
val.idx = (sample_locs_4x >> offset) & 0xf;
out_value[0] = (float)(val.idx + 8) / 16.0f;
val.idx = (sample_locs_4x >> (offset + 4)) & 0xf;
out_value[1] = (float)(val.idx + 8) / 16.0f;
sample_locs = &sample_locs_4x;
break;
case 8:
offset = 4 * (sample_index % 4 * 2);
index = sample_index / 4;
val.idx = (sample_locs_8x[index] >> offset) & 0xf;
out_value[0] = (float)(val.idx + 8) / 16.0f;
val.idx = (sample_locs_8x[index] >> (offset + 4)) & 0xf;
out_value[1] = (float)(val.idx + 8) / 16.0f;
sample_locs = sample_locs_8x;
break;
case 16:
offset = 4 * (sample_index % 4 * 2);
index = sample_index / 4;
val.idx = (sample_locs_16x[index] >> offset) & 0xf;
out_value[0] = (float)(val.idx + 8) / 16.0f;
val.idx = (sample_locs_16x[index] >> (offset + 4)) & 0xf;
out_value[1] = (float)(val.idx + 8) / 16.0f;
sample_locs = sample_locs_16x;
break;
}
out_value[0] = (GET_SX(sample_locs, sample_index) + 8) / 16.0f;
out_value[1] = (GET_SY(sample_locs, sample_index) + 8) / 16.0f;
}
void si_emit_sample_locations(struct radeon_winsys_cs *cs, int nr_samples)