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panfrost: Implement alpha testing natively

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On Midgard, we still have to lower on v6+. Passes Piglit
./fbo-mrt-alphatest (saving a cycle in the fragment shader to
compare/discard).

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/8447>
This commit is contained in:
Alyssa Rosenzweig
2021-01-12 11:44:43 -05:00
committed by Marge Bot
parent ff44f813fb
commit 275277a2b4
4 changed files with 12 additions and 3 deletions
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6
src/gallium/drivers/panfrost/pan_cmdstream.c
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@@ -542,7 +542,7 @@ panfrost_prepare_fs_state(struct panfrost_context *ctx,
state->stencil_mask_misc.stencil_mask_back = zsa->stencil_mask_back;
state->stencil_mask_misc.stencil_enable = zsa->base.stencil[0].enabled;
state->stencil_mask_misc.alpha_to_coverage = alpha_to_coverage;
state->stencil_mask_misc.alpha_test_compare_function = MALI_FUNC_ALWAYS;
state->stencil_mask_misc.alpha_test_compare_function = zsa->alpha_func;
state->stencil_mask_misc.depth_range_1 = rast->offset_tri;
state->stencil_mask_misc.depth_range_2 = rast->offset_tri;
state->stencil_mask_misc.single_sampled_lines = !rast->multisample;
@@ -554,6 +554,10 @@ panfrost_prepare_fs_state(struct panfrost_context *ctx,
state->stencil_back = zsa->stencil_back;
state->stencil_front.reference_value = ctx->stencil_ref.ref_value[0];
state->stencil_back.reference_value = ctx->stencil_ref.ref_value[back_enab ? 1 : 0];
/* v6+ fits register preload here, no alpha testing */
if (dev->arch <= 5)
state->alpha_reference = zsa->base.alpha_ref_value;
}

5
src/gallium/drivers/panfrost/pan_context.c
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@@ -1240,8 +1240,9 @@ panfrost_create_depth_stencil_state(struct pipe_context *pipe,
so->stencil_mask_back = so->stencil_mask_front;
}
/* Alpha lowered by frontend */
assert(!zsa->alpha_enabled);
so->alpha_func = zsa->alpha_enabled ?
panfrost_translate_compare_func(zsa->alpha_func) :
MALI_FUNC_ALWAYS;
/* TODO: Bounds test should be easy */
assert(!zsa->depth_bounds_test);

1
src/gallium/drivers/panfrost/pan_context.h
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@@ -282,6 +282,7 @@ struct panfrost_vertex_state {
struct panfrost_zsa_state {
struct pipe_depth_stencil_alpha_state base;
enum mali_func alpha_func;
/* Precomputed stencil state */
struct MALI_STENCIL stencil_front;

3
src/gallium/drivers/panfrost/pan_screen.c
View File

@@ -267,7 +267,10 @@ panfrost_get_param(struct pipe_screen *screen, enum pipe_cap param)
case PIPE_CAP_MAX_VARYINGS:
return 16;
/* Removed in v6 (Bifrost) */
case PIPE_CAP_ALPHA_TEST:
return dev->arch <= 5;
case PIPE_CAP_FLATSHADE:
case PIPE_CAP_TWO_SIDED_COLOR:
case PIPE_CAP_CLIP_PLANES: