Alexander Gavrilov
4d3bfb3f41
Subdivision surface efficiency relies on caching pre-computed topology
data for evaluation between frames. However, while eed45d2a23
introduced a second GPU subdiv evaluator type, it still only kept
one slot for caching this runtime data per mesh.
The result is that if the mesh is also needed on CPU, for instance
due to a modifier on a different object (e.g. shrinkwrap), the two
evaluators are used at the same time and fight over the single slot.
This causes the topology data to be discarded and recomputed twice
per frame.
Since avoiding duplicate evaluation is a complex task, this fix
simply adds a second separate cache slot for the GPU data, so that
the cost is simply running subdivision twice, not recomputing topology
twice.
To help diagnostics, I also add a message to show when GPU evaluation
is actually used to the modifier panel. Two frame counters are used
to suppress flicker in the UI panel.
Differential Revision: https://developer.blender.org/D17117
Pull Request #104441
102 lines
3.4 KiB
C++
102 lines
3.4 KiB
C++
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright 2021 Blender Foundation. All rights reserved. */
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/** \file
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* \ingroup bke
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*/
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#pragma once
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#include "BKE_subdiv.h"
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#include "BLI_sys_types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Hardcoded for until GPU shaders are automatically generated, then we will have a more
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* programmatic way of detecting this. */
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#define MAX_GPU_SUBDIV_SSBOS 12
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struct Mesh;
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struct Object;
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struct Scene;
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struct Subdiv;
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struct SubdivSettings;
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struct SubsurfModifierData;
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/* Runtime subsurf modifier data, cached in modifier on evaluated meshes. */
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typedef struct SubsurfRuntimeData {
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/* Subdivision settings, exists before descriptor or mesh wrapper is created. */
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SubdivSettings settings;
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/* Cached subdivision surface descriptor, with topology and settings. */
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struct Subdiv *subdiv_cpu;
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struct Subdiv *subdiv_gpu;
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/* Recent usage markers for UI diagnostics. To avoid UI flicker due to races
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* between evaluation and UI redraw, they are set to 2 when an evaluator is used,
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* and count down every frame. */
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char used_cpu, used_gpu;
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/* Cached mesh wrapper data, to be used for GPU subdiv or lazy evaluation on CPU. */
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bool has_gpu_subdiv;
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int resolution;
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bool use_optimal_display;
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bool calc_loop_normals;
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bool use_loop_normals;
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/* Cached from the draw code for stats display. */
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int stats_totvert;
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int stats_totedge;
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int stats_totpoly;
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int stats_totloop;
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} SubsurfRuntimeData;
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SubdivSettings BKE_subsurf_modifier_settings_init(const struct SubsurfModifierData *smd,
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bool use_render_params);
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bool BKE_subsurf_modifier_runtime_init(struct SubsurfModifierData *smd, bool use_render_params);
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bool BKE_subsurf_modifier_use_custom_loop_normals(const struct SubsurfModifierData *smd,
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const struct Mesh *mesh);
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/**
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* Return true if GPU subdivision evaluation is disabled by force due to incompatible mesh or
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* modifier settings. This will only return true if GPU subdivision is enabled in the preferences
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* and supported by the GPU. It is mainly useful for showing UI messages.
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*/
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bool BKE_subsurf_modifier_force_disable_gpu_evaluation_for_mesh(
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const struct SubsurfModifierData *smd, const struct Mesh *mesh);
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/**
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* \param skip_check_is_last: When true, we assume that the modifier passed is the last enabled
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* modifier in the stack.
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*/
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bool BKE_subsurf_modifier_can_do_gpu_subdiv(const struct Scene *scene,
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const struct Object *ob,
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const struct Mesh *mesh,
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const struct SubsurfModifierData *smd,
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int required_mode);
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bool BKE_subsurf_modifier_has_gpu_subdiv(const struct Mesh *mesh);
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extern void (*BKE_subsurf_modifier_free_gpu_cache_cb)(struct Subdiv *subdiv);
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/**
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* Main goal of this function is to give usable subdivision surface descriptor
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* which matches settings and topology.
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*/
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struct Subdiv *BKE_subsurf_modifier_subdiv_descriptor_ensure(
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struct SubsurfRuntimeData *runtime_data, const struct Mesh *mesh, bool for_draw_code);
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/**
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* Return the #ModifierMode required for the evaluation of the subsurf modifier,
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* which should be used to check if the modifier is enabled.
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*/
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int BKE_subsurf_modifier_eval_required_mode(bool is_final_render, bool is_edit_mode);
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#ifdef __cplusplus
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}
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#endif
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