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etnaviv: Support hw based rasterizer_discard

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Add native hardware support for rasterizer_discard on GPU cores that
support the HWTFB (Hardware Transform Feedback) feature. This moves
rasterizer discard handling from software clipping to dedicated
hardware state.

Passes all dEQP-GLES3.functional.rasterizer_discard.* with HWTFB.

Signed-off-by: Christian Gmeiner <cgmeiner@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/37320>
This commit is contained in:
Christian Gmeiner 2025-08-08 11:21:11 +02:00 • committed by Marge Bot
parent 53ff96a227
commit ebd5504f73
4 changed files with 10 additions and 1 deletions
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5
src/gallium/drivers/etnaviv/etnaviv_emit.c
View file

@ -606,6 +606,11 @@ etna_emit_state(struct etna_context *ctx)
}
}
if (unlikely(VIV_FEATURE(screen, ETNA_FEATURE_HWTFB) &&
(dirty & ETNA_DIRTY_RASTERIZER))) {
/*1C000*/ EMIT_STATE(TFB_CONFIG, etna_rasterizer_state(ctx->rasterizer)->TFB_CONFIG);
}
etna_coalesce_end(stream, &coalesce);
/* end only EMIT_STATE */

2
src/gallium/drivers/etnaviv/etnaviv_rasterizer.c
View file

@ -75,6 +75,8 @@ etna_rasterizer_state_create(struct pipe_context *pctx,
cs->offset_units = 0.0f;
}
cs->TFB_CONFIG = COND(so->rasterizer_discard, VIVS_TFB_CONFIG_RASTERIZER_DISCARD);
assert(!so->clip_halfz); /* could be supported with shader magic, actually
D3D z is default on older gc */

1
src/gallium/drivers/etnaviv/etnaviv_rasterizer.h
View file

@ -38,6 +38,7 @@ struct etna_rasterizer_state {
uint32_t PA_POINT_SIZE;
uint32_t PA_SYSTEM_MODE;
uint32_t SE_DEPTH_SCALE;
uint32_t TFB_CONFIG;
float offset_units;
uint32_t SE_CONFIG;
bool point_size_per_vertex;

3
src/gallium/drivers/etnaviv/etnaviv_state.c
View file

@ -812,7 +812,8 @@ etna_update_clipping(struct etna_context *ctx)
const struct etna_rasterizer_state *rasterizer = etna_rasterizer_state(ctx->rasterizer);
const struct pipe_framebuffer_state *fb = &ctx->framebuffer_s;
if (ctx->rasterizer->rasterizer_discard) {
if (!VIV_FEATURE(ctx->screen, ETNA_FEATURE_HWTFB) &&
ctx->rasterizer->rasterizer_discard) {
ctx->clipping.minx = 0;
ctx->clipping.miny = 0;
ctx->clipping.maxx = 0;