panfrost: Fix background showing when using discard
This fixes problems in a number of games, including SuperTuxKart, OpenMW and RVGL. v2: Use MALI_READS_ZS | 0x20 instead of MALI_WRITES_Z to match with the blob. Keep using 0x400 | 0x20 when depth is disabled. Closes: #2620 Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5001>
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@ -789,8 +789,14 @@ panfrost_frag_shader_meta_init(struct panfrost_context *ctx,
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* related to forward-pixel kill, as per "Mali Performance 3: Is
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* EGL_BUFFER_PRESERVED a good thing?" by Peter Harris */
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const struct pipe_depth_stencil_alpha_state *zsa = ctx->depth_stencil;
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bool depth_enabled = fs->writes_depth ||
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(zsa && zsa->depth.enabled && zsa->depth.func != PIPE_FUNC_ALWAYS);
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SET_BIT(fragmeta->unknown2_3, MALI_CAN_DISCARD, fs->can_discard);
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SET_BIT(fragmeta->midgard1.flags_lo, 0x400, fs->can_discard);
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SET_BIT(fragmeta->midgard1.flags_lo, 0x400, !depth_enabled && fs->can_discard);
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SET_BIT(fragmeta->midgard1.flags_lo, MALI_READS_ZS, depth_enabled && fs->can_discard);
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}
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panfrost_frag_meta_rasterizer_update(ctx, fragmeta);
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