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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2021 Blender Foundation. All rights reserved. */
/** \file
* \ingroup bke
*/
#pragma once
#include "BKE_subdiv.h"
#include "BLI_sys_types.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Hardcoded for until GPU shaders are automatically generated, then we will have a more
* programmatic way of detecting this. */
#define MAX_GPU_SUBDIV_SSBOS 12
struct Mesh;
struct Object;
struct Scene;
struct Subdiv;
struct SubdivSettings;
struct SubsurfModifierData;
/* Runtime subsurf modifier data, cached in modifier on evaluated meshes. */
typedef struct SubsurfRuntimeData {
/* Subdivision settings, exists before descriptor or mesh wrapper is created. */
SubdivSettings settings;
/* Cached subdivision surface descriptor, with topology and settings. */
struct Subdiv *subdiv;
bool set_by_draw_code;
/* Cached mesh wrapper data, to be used for GPU subdiv or lazy evaluation on CPU. */
bool has_gpu_subdiv;
int resolution;
bool use_optimal_display;
bool calc_loop_normals;
bool use_loop_normals;
/* Cached from the draw code for stats display. */
int stats_totvert;
int stats_totedge;
int stats_totpoly;
int stats_totloop;
} SubsurfRuntimeData;
bool BKE_subsurf_modifier_runtime_init(struct SubsurfModifierData *smd, bool use_render_params);
bool BKE_subsurf_modifier_use_custom_loop_normals(const struct SubsurfModifierData *smd,
const struct Mesh *mesh);
/**
* Return true if GPU subdivision evaluation is disabled by force due to incompatible mesh or
* modifier settings. This will only return true if GPU subdivision is enabled in the preferences
* and supported by the GPU. It is mainly useful for showing UI messages.
*/
bool BKE_subsurf_modifier_force_disable_gpu_evaluation_for_mesh(
const struct SubsurfModifierData *smd, const struct Mesh *mesh);
/**
* \param skip_check_is_last: When true, we assume that the modifier passed is the last enabled
* modifier in the stack.
*/
bool BKE_subsurf_modifier_can_do_gpu_subdiv(const struct Scene *scene,
const struct Object *ob,
const struct Mesh *mesh,
const struct SubsurfModifierData *smd,
int required_mode);
bool BKE_subsurf_modifier_has_gpu_subdiv(const struct Mesh *mesh);
extern void (*BKE_subsurf_modifier_free_gpu_cache_cb)(struct Subdiv *subdiv);
/**
* Main goal of this function is to give usable subdivision surface descriptor
* which matches settings and topology.
*/
struct Subdiv *BKE_subsurf_modifier_subdiv_descriptor_ensure(
struct SubsurfRuntimeData *runtime_data, const struct Mesh *mesh, bool for_draw_code);
/**
* Return the #ModifierMode required for the evaluation of the subsurf modifier,
* which should be used to check if the modifier is enabled.
*/
int BKE_subsurf_modifier_eval_required_mode(bool is_final_render, bool is_edit_mode);
#ifdef __cplusplus
}
#endif
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