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frontend/nine: Fix ff position_t fallback when w = 0

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For post-transformed vertices, w = 0 is similar to
w = 1. Replace the value to fix rcp(w).

It is common for apps to pass w = 0 for
position_t.

cc: mesa-stable

Signed-off-by: Axel Davy <davyaxel0@gmail.com>
Acked-by: David Heidelberg <david.heidelberg@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18021>
This commit is contained in:
Axel Davy
2022-07-28 22:55:40 +02:00
parent 93da6e9f34
commit b5df20568a
1 changed files with 3 additions and 0 deletions
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3
src/gallium/frontends/nine/nine_ff.c
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@@ -455,6 +455,9 @@ nine_ff_build_vs(struct NineDevice9 *device, struct vs_build_ctx *vs)
ureg_ADD(ureg, ureg_writemask(tmp, TGSI_WRITEMASK_XY), ureg_src(tmp), ureg_imm1f(ureg, -1.0f));
/* Y needs to be reversed */
ureg_MOV(ureg, ureg_writemask(tmp, TGSI_WRITEMASK_Y), ureg_negate(ureg_src(tmp)));
/* Replace w by 1 if it equals to 0 */
ureg_CMP(ureg, ureg_writemask(tmp, TGSI_WRITEMASK_W), ureg_negate(ureg_abs(ureg_scalar(ureg_src(tmp), TGSI_SWIZZLE_W))),
ureg_scalar(ureg_src(tmp), TGSI_SWIZZLE_W), ureg_imm1f(ureg, 1.0f));
/* inverse rhw */
ureg_RCP(ureg, ureg_writemask(tmp, TGSI_WRITEMASK_W), _W(tmp));
/* multiply X, Y, Z by w */