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Implement distance fade and transparency

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The built-in ALPHA in spatial shaders comes pre-set with a per-instance
transparency value. Multiply by it if you want to keep it.

The transparency value of any given GeometryInstance3D is affected by:
   - Its new "transparency" property.
   - Its own visiblity range when the new "visibility_range_fade_mode"
     property is set to "Self".
   - Its parent visibility range when the parent's fade mode is
     set to "Dependencies".

The "Self" mode will fade-out the instance when reaching the visibility
range limits, while the "Dependencies" mode will fade-in its
dependencies.

Per-instance transparency is only implemented in the forward clustered
renderer, support for mobile should be added in the future.

Co-authored-by: reduz <reduzio@gmail.com>
This commit is contained in:
JFonS 2021-07-20 15:17:34 -03:00 • committed by jfons
parent 88d9914519
commit c571e4a7f4
21 changed files with 371 additions and 92 deletions
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12
servers/rendering/renderer_scene_cull.h
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@ -267,7 +267,8 @@ public:
FLAG_VISIBILITY_DEPENDENCY_NEEDS_CHECK = (3 << 20), // 2 bits, overlaps with the other vis. dependency flags
FLAG_VISIBILITY_DEPENDENCY_HIDDEN_CLOSE_RANGE = (1 << 20),
FLAG_VISIBILITY_DEPENDENCY_HIDDEN = (1 << 21),
FLAG_GEOM_PROJECTOR_SOFTSHADOW_DIRTY = (1 << 22),
FLAG_VISIBILITY_DEPENDENCY_FADE_CHILDREN = (1 << 22),
FLAG_GEOM_PROJECTOR_SOFTSHADOW_DIRTY = (1 << 23),
};
uint32_t flags = 0;
@ -286,12 +287,14 @@ public:
struct InstanceVisibilityData {
uint64_t viewport_state = 0;
int32_t array_index = -1;
RS::VisibilityRangeFadeMode fade_mode = RS::VISIBILITY_RANGE_FADE_DISABLED;
Vector3 position;
Instance *instance = nullptr;
float range_begin = 0.0f;
float range_end = 0.0f;
float range_begin_margin = 0.0f;
float range_end_margin = 0.0f;
float children_fade_alpha = 1.0f;
};
class VisibilityArray : public BinSortedArray<InstanceVisibilityData> {
@ -440,6 +443,7 @@ public:
float visibility_range_end;
float visibility_range_begin_margin;
float visibility_range_end_margin;
RS::VisibilityRangeFadeMode visibility_range_fade_mode = RS::VISIBILITY_RANGE_FADE_DISABLED;
Instance *visibility_parent = nullptr;
Set<Instance *> visibility_dependencies;
uint32_t visibility_dependencies_depth;
@ -920,6 +924,7 @@ public:
virtual void instance_set_blend_shape_weight(RID p_instance, int p_shape, float p_weight);
virtual void instance_set_surface_override_material(RID p_instance, int p_surface, RID p_material);
virtual void instance_set_visible(RID p_instance, bool p_visible);
virtual void instance_geometry_set_transparency(RID p_instance, float p_transparency);
virtual void instance_set_custom_aabb(RID p_instance, AABB p_aabb);
@ -941,7 +946,7 @@ public:
virtual void instance_geometry_set_cast_shadows_setting(RID p_instance, RS::ShadowCastingSetting p_shadow_casting_setting);
virtual void instance_geometry_set_material_override(RID p_instance, RID p_material);
virtual void instance_geometry_set_visibility_range(RID p_instance, float p_min, float p_max, float p_min_margin, float p_max_margin);
virtual void instance_geometry_set_visibility_range(RID p_instance, float p_min, float p_max, float p_min_margin, float p_max_margin, RS::VisibilityRangeFadeMode p_fade_mode);
virtual void instance_geometry_set_lightmap(RID p_instance, RID p_lightmap, const Rect2 &p_lightmap_uv_scale, int p_slice_index);
virtual void instance_geometry_set_lod_bias(RID p_instance, float p_lod_bias);
@ -1013,7 +1018,7 @@ public:
void _visibility_cull_threaded(uint32_t p_thread, VisibilityCullData *cull_data);
void _visibility_cull(const VisibilityCullData &cull_data, uint64_t p_from, uint64_t p_to);
_FORCE_INLINE_ void _visibility_cull(const VisibilityCullData &cull_data, uint64_t p_idx);
template <bool p_fade_check>
_FORCE_INLINE_ int _visibility_range_check(InstanceVisibilityData &r_vis_data, const Vector3 &p_camera_pos, uint64_t p_viewport_mask);
struct CullData {
@ -1030,6 +1035,7 @@ public:
void _scene_cull_threaded(uint32_t p_thread, CullData *cull_data);
void _scene_cull(CullData &cull_data, InstanceCullResult &cull_result, uint64_t p_from, uint64_t p_to);
_FORCE_INLINE_ bool _visibility_parent_check(const CullData &p_cull_data, const InstanceData &p_instance_data);
bool _render_reflection_probe_step(Instance *p_instance, int p_step);
void _render_scene(const RendererSceneRender::CameraData *p_camera_data, RID p_render_buffers, RID p_environment, RID p_force_camera_effects, uint32_t p_visible_layers, RID p_scenario, RID p_viewport, RID p_shadow_atlas, RID p_reflection_probe, int p_reflection_probe_pass, float p_screen_lod_threshold, bool p_using_shadows = true, RenderInfo *r_render_info = nullptr);