4bf647ff3b
# Objective - Alpha blending can easily fail in many situations and requires sorting on the cpu ## Solution - Implement order independent transparency (OIT) as an alternative to alpha blending - The implementation uses 2 passes - The first pass records all the fragments colors and position to a buffer that is the size of N layers * the render target resolution. - The second pass sorts the fragments, blends them and draws them to the screen. It also currently does manual depth testing because early-z fails in too many cases in the first pass. ## Testing - We've been using this implementation at foresight in production for many months now and we haven't had any issues related to OIT. --- ## Showcase   ## Future work - Add an example showing how to use OIT for a custom material - Next step would be to implement a per-pixel linked list to reduce memory use - I'd also like to investigate using a BinnedRenderPhase instead of a SortedRenderPhase. If it works, it would make the transparent pass significantly faster. --------- Co-authored-by: Kristoffer Søholm <k.soeholm@gmail.com> Co-authored-by: JMS55 <47158642+JMS55@users.noreply.github.com> Co-authored-by: Charlotte McElwain <charlotte.c.mcelwain@gmail.com>
110 lines
4.5 KiB
WebGPU Shading Language
110 lines
4.5 KiB
WebGPU Shading Language
#define_import_path bevy_pbr::mesh_view_bindings
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#import bevy_pbr::mesh_view_types as types
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#import bevy_render::{
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view::View,
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globals::Globals,
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}
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@group(0) @binding(0) var<uniform> view: View;
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@group(0) @binding(1) var<uniform> lights: types::Lights;
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#ifdef NO_CUBE_ARRAY_TEXTURES_SUPPORT
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@group(0) @binding(2) var point_shadow_textures: texture_depth_cube;
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#else
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@group(0) @binding(2) var point_shadow_textures: texture_depth_cube_array;
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#endif
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@group(0) @binding(3) var point_shadow_textures_comparison_sampler: sampler_comparison;
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@group(0) @binding(4) var point_shadow_textures_linear_sampler: sampler;
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#ifdef NO_ARRAY_TEXTURES_SUPPORT
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@group(0) @binding(5) var directional_shadow_textures: texture_depth_2d;
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#else
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@group(0) @binding(5) var directional_shadow_textures: texture_depth_2d_array;
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#endif
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@group(0) @binding(6) var directional_shadow_textures_comparison_sampler: sampler_comparison;
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@group(0) @binding(7) var directional_shadow_textures_linear_sampler: sampler;
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#if AVAILABLE_STORAGE_BUFFER_BINDINGS >= 3
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@group(0) @binding(8) var<storage> clusterable_objects: types::ClusterableObjects;
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@group(0) @binding(9) var<storage> clusterable_object_index_lists: types::ClusterLightIndexLists;
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@group(0) @binding(10) var<storage> cluster_offsets_and_counts: types::ClusterOffsetsAndCounts;
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#else
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@group(0) @binding(8) var<uniform> clusterable_objects: types::ClusterableObjects;
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@group(0) @binding(9) var<uniform> clusterable_object_index_lists: types::ClusterLightIndexLists;
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@group(0) @binding(10) var<uniform> cluster_offsets_and_counts: types::ClusterOffsetsAndCounts;
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#endif
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@group(0) @binding(11) var<uniform> globals: Globals;
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@group(0) @binding(12) var<uniform> fog: types::Fog;
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@group(0) @binding(13) var<uniform> light_probes: types::LightProbes;
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const VISIBILITY_RANGE_UNIFORM_BUFFER_SIZE: u32 = 64u;
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#if AVAILABLE_STORAGE_BUFFER_BINDINGS >= 6
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@group(0) @binding(14) var<storage> visibility_ranges: array<vec4<f32>>;
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#else
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@group(0) @binding(14) var<uniform> visibility_ranges: array<vec4<f32>, VISIBILITY_RANGE_UNIFORM_BUFFER_SIZE>;
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#endif
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@group(0) @binding(15) var<uniform> ssr_settings: types::ScreenSpaceReflectionsSettings;
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@group(0) @binding(16) var screen_space_ambient_occlusion_texture: texture_2d<f32>;
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#ifdef MULTIPLE_LIGHT_PROBES_IN_ARRAY
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@group(0) @binding(17) var diffuse_environment_maps: binding_array<texture_cube<f32>, 8u>;
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@group(0) @binding(18) var specular_environment_maps: binding_array<texture_cube<f32>, 8u>;
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#else
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@group(0) @binding(17) var diffuse_environment_map: texture_cube<f32>;
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@group(0) @binding(18) var specular_environment_map: texture_cube<f32>;
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#endif
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@group(0) @binding(19) var environment_map_sampler: sampler;
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@group(0) @binding(20) var<uniform> environment_map_uniform: types::EnvironmentMapUniform;
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#ifdef IRRADIANCE_VOLUMES_ARE_USABLE
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#ifdef MULTIPLE_LIGHT_PROBES_IN_ARRAY
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@group(0) @binding(21) var irradiance_volumes: binding_array<texture_3d<f32>, 8u>;
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#else
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@group(0) @binding(21) var irradiance_volume: texture_3d<f32>;
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#endif
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@group(0) @binding(22) var irradiance_volume_sampler: sampler;
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#endif
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// NB: If you change these, make sure to update `tonemapping_shared.wgsl` too.
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@group(0) @binding(23) var dt_lut_texture: texture_3d<f32>;
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@group(0) @binding(24) var dt_lut_sampler: sampler;
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#ifdef MULTISAMPLED
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#ifdef DEPTH_PREPASS
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@group(0) @binding(25) var depth_prepass_texture: texture_depth_multisampled_2d;
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#endif // DEPTH_PREPASS
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#ifdef NORMAL_PREPASS
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@group(0) @binding(26) var normal_prepass_texture: texture_multisampled_2d<f32>;
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#endif // NORMAL_PREPASS
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#ifdef MOTION_VECTOR_PREPASS
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@group(0) @binding(27) var motion_vector_prepass_texture: texture_multisampled_2d<f32>;
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#endif // MOTION_VECTOR_PREPASS
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#else // MULTISAMPLED
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#ifdef DEPTH_PREPASS
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@group(0) @binding(25) var depth_prepass_texture: texture_depth_2d;
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#endif // DEPTH_PREPASS
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#ifdef NORMAL_PREPASS
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@group(0) @binding(26) var normal_prepass_texture: texture_2d<f32>;
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#endif // NORMAL_PREPASS
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#ifdef MOTION_VECTOR_PREPASS
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@group(0) @binding(27) var motion_vector_prepass_texture: texture_2d<f32>;
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#endif // MOTION_VECTOR_PREPASS
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#endif // MULTISAMPLED
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#ifdef DEFERRED_PREPASS
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@group(0) @binding(28) var deferred_prepass_texture: texture_2d<u32>;
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#endif // DEFERRED_PREPASS
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@group(0) @binding(29) var view_transmission_texture: texture_2d<f32>;
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@group(0) @binding(30) var view_transmission_sampler: sampler;
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#ifdef OIT_ENABLED
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@group(0) @binding(31) var<storage, read_write> oit_layers: array<vec2<u32>>;
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@group(0) @binding(32) var<storage, read_write> oit_layer_ids: array<atomic<i32>>;
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@group(0) @binding(33) var<uniform> oit_layers_count: i32;
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#endif OIT_ENABLED
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