Implement Shadows #24

Merged

SeanOMik merged 28 commits from feat/shadow-maps into main

2024-08-10 03:10:30 +00:00

SeanOMik commented

2024-08-10 02:58:11 +00:00

Owner

This PR implements shadows for point lights, spot lights, and directional lights. It also has soft shadows with PCF for all light types, and PCSS for directional lights only.

You can modify the light caster settings with an ecs world resource:

world.add_resource(ShadowCasterSettings {
    // Non directional lights ignore this and will fall-back to PCF
    filtering_mode: ShadowFilteringMode::Pcss,
    pcf_samples_num: 25,
    pcss_blocker_search_samples: 25,
    ..Default::default()
});

You can also set specific caster settings on individual lights by adding the same struct as a component to the entity that casts the light:

let mut light_tran = Transform::from_xyz(0.0, 0.0, 0.0);
light_tran.scale = Vec3::new(0.5, 0.5, 0.5);
light_tran.rotate_x(math::Angle::Degrees(-45.0));
light_tran.rotate_y(math::Angle::Degrees(-35.0));
world.spawn((
    //cube_mesh.clone(),
    DirectionalLight {
        enabled: true,
        color: Vec3::new(1.0, 0.95, 0.9),
        intensity: 0.9,
    },
    ShadowCasterSettings {
        filtering_mode: ShadowFilteringMode::Pcss,
        pcf_samples_num: 64,
        pcss_blocker_search_samples: 36,
        constant_depth_bias_scale: 5.0,
        ..Default::default()
    },
    light_tran,
));

By default, all lights cast shadows, #23 will fix that.

This PR implements shadows for point lights, spot lights, and directional lights. It also has soft shadows with PCF for all light types, and PCSS for directional lights only. You can modify the light caster settings with an ecs world resource: ```rust world.add_resource(ShadowCasterSettings { // Non directional lights ignore this and will fall-back to PCF filtering_mode: ShadowFilteringMode::Pcss, pcf_samples_num: 25, pcss_blocker_search_samples: 25, ..Default::default() }); ``` You can also set specific caster settings on individual lights by adding the same struct as a component to the entity that casts the light: ```rust let mut light_tran = Transform::from_xyz(0.0, 0.0, 0.0); light_tran.scale = Vec3::new(0.5, 0.5, 0.5); light_tran.rotate_x(math::Angle::Degrees(-45.0)); light_tran.rotate_y(math::Angle::Degrees(-35.0)); world.spawn(( //cube_mesh.clone(), DirectionalLight { enabled: true, color: Vec3::new(1.0, 0.95, 0.9), intensity: 0.9, }, ShadowCasterSettings { filtering_mode: ShadowFilteringMode::Pcss, pcf_samples_num: 64, pcss_blocker_search_samples: 36, constant_depth_bias_scale: 5.0, ..Default::default() }, light_tran, )); ``` By default, all lights cast shadows, #23 will fix that.

SeanOMik added the

Kind/Feature

Priority

Medium

labels 2024-08-10 02:58:11 +00:00

SeanOMik added 28 commits 2024-08-10 02:58:12 +00:00

create an example for testing shadow maps 7ff67a194b

render: move most of the mesh processing to a MeshPrepare node 3a80c069c9

Moving that out of the MeshesPass makes the rendering meshes accessible to other passes/nodes. The shadow pass will need access to them which is why this was done now

render: create a depth map for the directional light e8974bbd44

render: start moving to a shadow map atlas texture and expose the resources as slots 7b2d2424a3

render: bind the shadow map atlas to the meshes shaders 1c649b2eb6

render: bind direction light projection matrix to meshes shader 6c6893149a

render: get simple directional shadow maps working fd65f754cf

render: cull back faces, code cleanup to fix warnings 6d57b40629

render: implement simple texture atlas for the shadow maps e2b554b4ef

render: implement packed texture atlas for shadow maps a4ce4cb432

render: provide shadow texture atlas frame for each shadow casting light cc1c482c40

render: create a GpuSlotBuffer for stable indices in a gpu buffer 87aa440691

render: fix shadow map atlas packing by writing my own skyline packer 40fa9c09da

render: point light shadows in texture atlas, fix bug with unaligned GpuSlotBuffer b45c2f4fab