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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2021 Blender Foundation. All rights reserved. */
#include "BKE_subdiv_modifier.h"
#include "MEM_guardedalloc.h"
#include "DNA_mesh_types.h"
#include "DNA_modifier_types.h"
#include "DNA_object_types.h"
#include "DNA_scene_types.h"
#include "DNA_userdef_types.h"
#include "BKE_modifier.h"
#include "BKE_subdiv.h"
#include "GPU_capabilities.h"
#include "GPU_context.h"
#include "opensubdiv_capi.h"
bool BKE_subsurf_modifier_runtime_init(SubsurfModifierData *smd, const bool use_render_params)
{
const int requested_levels = (use_render_params) ? smd->renderLevels : smd->levels;
SubdivSettings settings;
settings.is_simple = (smd->subdivType == SUBSURF_TYPE_SIMPLE);
settings.is_adaptive = !(smd->flags & eSubsurfModifierFlag_UseRecursiveSubdivision);
settings.level = settings.is_simple ? 1 :
(settings.is_adaptive ? smd->quality : requested_levels);
settings.use_creases = (smd->flags & eSubsurfModifierFlag_UseCrease);
settings.vtx_boundary_interpolation = BKE_subdiv_vtx_boundary_interpolation_from_subsurf(
smd->boundary_smooth);
settings.fvar_linear_interpolation = BKE_subdiv_fvar_interpolation_from_uv_smooth(
smd->uv_smooth);
SubsurfRuntimeData *runtime_data = (SubsurfRuntimeData *)smd->modifier.runtime;
if (settings.level == 0) {
/* Modifier is effectively disabled, but still update settings if runtime data
* was already allocated. */
if (runtime_data) {
runtime_data->settings = settings;
}
return false;
}
/* Allocate runtime data if it did not exist yet. */
if (runtime_data == NULL) {
runtime_data = MEM_callocN(sizeof(*runtime_data), "subsurf runtime");
smd->modifier.runtime = runtime_data;
}
runtime_data->settings = settings;
return true;
}
static ModifierData *modifier_get_last_enabled_for_mode(const Scene *scene,
const Object *ob,
int required_mode)
{
ModifierData *md = ob->modifiers.last;
while (md) {
if (BKE_modifier_is_enabled(scene, md, required_mode)) {
break;
}
md = md->prev;
}
return md;
}
bool BKE_subsurf_modifier_use_custom_loop_normals(const SubsurfModifierData *smd, const Mesh *mesh)
{
return (smd->flags & eSubsurfModifierFlag_UseCustomNormals) && (mesh->flag & ME_AUTOSMOOTH) &&
CustomData_has_layer(&mesh->ldata, CD_CUSTOMLOOPNORMAL);
}
static bool subsurf_modifier_use_autosmooth_or_split_normals(const SubsurfModifierData *smd,
const Mesh *mesh)
{
return (mesh->flag & ME_AUTOSMOOTH) || BKE_subsurf_modifier_use_custom_loop_normals(smd, mesh);
}
static bool is_subdivision_evaluation_possible_on_gpu(void)
{
/* Only OpenGL is supported for OpenSubdiv evaluation for now. */
if (GPU_backend_get_type() != GPU_BACKEND_OPENGL) {
return false;
}
if (!(GPU_compute_shader_support() && GPU_shader_storage_buffer_objects_support())) {
return false;
}
if (GPU_max_compute_shader_storage_blocks() < MAX_GPU_SUBDIV_SSBOS) {
return false;
}
const int available_evaluators = openSubdiv_getAvailableEvaluators();
if ((available_evaluators & OPENSUBDIV_EVALUATOR_GLSL_COMPUTE) == 0) {
return false;
}
return true;
}
bool BKE_subsurf_modifier_force_disable_gpu_evaluation_for_mesh(const SubsurfModifierData *smd,
const Mesh *mesh)
{
if ((U.gpu_flag & USER_GPU_FLAG_SUBDIVISION_EVALUATION) == 0) {
/* GPU subdivision is explicitly disabled, so we don't force it. */
return false;
}
if (!is_subdivision_evaluation_possible_on_gpu()) {
/* The GPU type is not compatible with the subdivision. */
return false;
}
return subsurf_modifier_use_autosmooth_or_split_normals(smd, mesh);
}
bool BKE_subsurf_modifier_can_do_gpu_subdiv(const Scene *scene,
const Object *ob,
const Mesh *mesh,
const SubsurfModifierData *smd,
int required_mode)
{
if ((U.gpu_flag & USER_GPU_FLAG_SUBDIVISION_EVALUATION) == 0) {
return false;
}
/* Deactivate GPU subdivision if autosmooth or custom split normals are used as those are
* complicated to support on GPU, and should really be separate workflows. */
if (subsurf_modifier_use_autosmooth_or_split_normals(smd, mesh)) {
return false;
}
ModifierData *md = modifier_get_last_enabled_for_mode(scene, ob, required_mode);
if (md != (const ModifierData *)smd) {
return false;
}
return is_subdivision_evaluation_possible_on_gpu();
}
bool BKE_subsurf_modifier_has_gpu_subdiv(const Mesh *mesh)
{
SubsurfRuntimeData *runtime_data = mesh->runtime.subsurf_runtime_data;
return runtime_data && runtime_data->has_gpu_subdiv;
}
void (*BKE_subsurf_modifier_free_gpu_cache_cb)(Subdiv *subdiv) = NULL;
Subdiv *BKE_subsurf_modifier_subdiv_descriptor_ensure(SubsurfRuntimeData *runtime_data,
const Mesh *mesh,
const bool for_draw_code)
{
if (runtime_data->subdiv && runtime_data->set_by_draw_code != for_draw_code) {
BKE_subdiv_free(runtime_data->subdiv);
runtime_data->subdiv = NULL;
}
Subdiv *subdiv = BKE_subdiv_update_from_mesh(
runtime_data->subdiv, &runtime_data->settings, mesh);
runtime_data->subdiv = subdiv;
runtime_data->set_by_draw_code = for_draw_code;
return subdiv;
}
int BKE_subsurf_modifier_eval_required_mode(bool is_final_render, bool is_edit_mode)
{
if (is_final_render) {
return eModifierMode_Render;
}
return eModifierMode_Realtime | (is_edit_mode ? eModifierMode_Editmode : 0);
}
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