STRUCT MALI_C55_PARAMS_MESH_SHADING_SELECTION(9)

💅 struct mali_c55_params_mesh_shading_selection(9) 💅

okay bestie, this is the Kernel API Manual page for the header that gets shortened to struct mali...ng_selection(9) — the full-name serve is right below, and yes, it’s giving mesh shading realness. 🫶

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🎀 NAME 🎀

struct mali_c55_params_mesh_shading_selection — Mesh table selection. That’s the whole title, and it’s iconic. ✨

✨ SYNOPSIS ✨

       struct mali_c55_params_mesh_shading_selection {
           struct v4l2_isp_params_block_header header;
           __u8 mesh_alpha_bank_r;
           __u8 mesh_alpha_bank_g;
           __u8 mesh_alpha_bank_b;
           __u8 mesh_alpha_r;
           __u8 mesh_alpha_g;
           __u8 mesh_alpha_b;
           __u16 mesh_strength;
        };

🧚 Members 🧚

• header — the Mali-C55 parameters block header. The structural moment, literally.
• mesh_alpha_bank_r — Red mesh table select (c:type:enum mali_c55_params_mesh_alpha_bank).
• mesh_alpha_bank_g — Green mesh table select (c:type:enum mali_c55_params_mesh_alpha_bank).
• mesh_alpha_bank_b — Blue mesh table select (c:type:enum mali_c55_params_mesh_alpha_bank).
• mesh_alpha_r — Blend coefficient for R [0..255].
• mesh_alpha_g — Blend coefficient for G [0..255].
• mesh_alpha_b — Blend coefficient for B [0..255].
• mesh_strength — Mesh strength in Q4.12 format [0..4096].

💖 Description 💖

Okay so the module computes the final correction coefficients by blending the ones from two light source tables. Those tables are selected independently for each colour channel by the mesh_alpha_bank_r/g/b fields. Obsessed with the per-channel independence, honestly. 🌈

For each node, the final blended coefficients are calculated with this equation:

Final coefficient = (a * LS :sub:`b` + (256 - a) * LS :sub:`a` / 256

Where a is the mesh_alpha_r/g/b value, and LS :sub:`a` and LS :sub:`b` are the node cofficients for the two tables selected by the mesh_alpha_bank_r/g/b value. (Yes, “cofficients” is exactly what the page says — we keep the lore. 💀)

The scale of the applied correction may also be controlled by tuning the mesh_strength member. It’s a modifier to the final coefficients, and it can be used to globally reduce the gains applied. slay that global gain reduction. 🔥

Also: header.type should be set to MALI_C55_PARAM_MESH_SHADING_SELECTION from :c:type:`mali_c55_param_block_type` for this block. Don’t forget the type, bestie — it’s the entry ticket. 🎟️

🌈 SEE ALSO 🌈

Kernel file: ./include/uapi/linux/media/arm/mali-c55-config.h — that’s the source file, and then the whole referenced squad:

• struct mali_c55_ae_1024bin_hist(9)
• struct mali_c55_ae_5bin_hist(9)
• struct mali_c55_awb_average_ratios(9)
• struct mali_c55_af_statistics(9)
• struct mali_c55_stats_buffer(9)
• enum mali_c55_param_block_type(9)
• struct mali_c55_params_sensor_off_preshading(9)
• enum mali_c55_aexp_hist_tap_points(9)
• enum mali_c55_aexp_skip_x(9)
• enum mali_c55_aexp_skip_y(9)
• enum mali_c55_aexp_row_column_offset(9)
• enum mali_c55_aexp_hist_plane_mode(9)
• struct mali_c55_params_aexp_hist(9)
• struct mali_c55_params_aexp_weights(9)
• struct mali_c55_params_digital_gain(9)
• enum mali_c55_awb_stats_mode(9)
• struct mali_c55_params_awb_gains(9)
• enum mali_c55_params_awb_tap_points(9)
• struct mali_c55_params_awb_config(9)
• struct mali_c55_params_mesh_shading_config(9)
• struct mali_c55_params_ccm(9)
• struct mali_c55_params_gamma(9)
• MALI_C55_PARAMS_MAX_SIZE(9)

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footer source/version: ./include/uapi/linux/media/arm • struct mali...ng_selection(9) • October 2026 — bye bestie, mwah. 💅💖