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panfrost/midgard/disasm: Varying perspective divides

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With an extra flag, we're able to do a perspective division "for free"
while loading a varying.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
This commit is contained in:
Alyssa Rosenzweig 2019-06-10 11:18:41 -07:00
parent fc472007e7
commit 109460f03a
2 changed files with 28 additions and 4 deletions
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15
src/gallium/drivers/panfrost/midgard/disassemble.c
View file

@ -924,12 +924,21 @@ print_varying_parameters(midgard_load_store_word *word)
else
printf(".interp%d", param.interpolation);
}
} else if (param.flat || param.interpolation) {
if (param.modifier != midgard_varying_mod_none) {
if (param.modifier == midgard_varying_mod_perspective_w)
printf(".perspectivew");
else if (param.modifier == midgard_varying_mod_perspective_z)
printf(".perspectivez");
else
printf(".mod%d", param.modifier);
}
} else if (param.flat || param.interpolation || param.modifier) {
printf(" /* is_varying not set but varying metadata attached */");
}
if (param.zero1 || param.zero2)
printf(" /* zero tripped, %d %d */ ", param.zero1, param.zero2);
if (param.zero0 || param.zero1 || param.zero2)
printf(" /* zero tripped, %d %d %d */ ", param.zero0, param.zero1, param.zero2);
}
static bool

17
src/gallium/drivers/panfrost/midgard/midgard.h
View file

@ -435,10 +435,25 @@ typedef enum {
midgard_interp_default = 2
} midgard_interpolation;
typedef enum {
midgard_varying_mod_none = 0,
/* Other values unknown */
/* Take the would-be result and divide all components by its z/w
* (perspective division baked in with the load) */
midgard_varying_mod_perspective_z = 2,
midgard_varying_mod_perspective_w = 3,
} midgard_varying_modifier;
typedef struct
__attribute__((__packed__))
{
unsigned zero1 : 4; /* Always zero */
unsigned zero0 : 1; /* Always zero */
midgard_varying_modifier modifier : 2;
unsigned zero1: 1; /* Always zero */
/* Varying qualifiers, zero if not a varying */
unsigned flat : 1;