kindling-host: renderer bindings

guest/rust/hearth-guest/src/lib.rs

@@ -306,6 +306,7 @@ impl Message {
 }
 
 /// A loaded lump.
+#[derive(Debug)]
 pub struct Lump(u32);
 
 impl Drop for Lump {
@@ -315,8 +316,8 @@ impl Drop for Lump {
 }
 
 impl Lump {
-    /// Loads a new lump from in-process data.
-    pub fn load(data: &[u8]) -> Self {
+    /// Loads a new lump directly from in-process bytes.
+    pub fn load_raw(data: &[u8]) -> Self {
         unsafe {
             let ptr = data.as_ptr() as u32;
             let len = data.len() as u32;
@@ -325,6 +326,12 @@ impl Lump {
         }
     }
 
+    /// Loads a JSON-encoded lump from a serializable data type.
+    pub fn load(data: &impl Serialize) -> Self {
+        let bytes = serde_json::to_vec(data).unwrap();
+        Self::load_raw(&bytes)
+    }
+
     /// Loads a lump from the ID of an already existing lump.
     pub fn load_by_id(id: &LumpId) -> Self {
         unsafe {

kindling/host/src/lib.rs

@@ -27,6 +27,7 @@ pub mod canvas;
 pub mod debug_draw;
 pub mod fs;
 pub mod registry;
+pub mod renderer;
 pub mod terminal;
 pub mod time;
 pub mod wasm;

kindling/host/src/renderer.rs

@@ -0,0 +1,166 @@
+// Copyright (c) 2024 the Hearth contributors.
+// SPDX-License-Identifier: AGPL-3.0-or-later
+//
+// This file is part of Hearth.
+//
+// Hearth is free software: you can redistribute it and/or modify it under the
+// terms of the GNU Affero General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option)
+// any later version.
+//
+// Hearth is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+// details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with Hearth. If not, see <https://www.gnu.org/licenses/>.
+
+use super::*;
+
+use glam::{Mat4, Vec3};
+use hearth_guest::{renderer::*, Lump};
+
+lazy_static::lazy_static! {
+    static ref RENDERER: RequestResponse<RendererRequest, RendererResponse> =
+        RequestResponse::expect_service("hearth.Renderer");
+}
+
+/// Set the global ambient lighting levels.
+pub fn set_ambient_lighting(color: Vec3) {
+    let (result, _) = RENDERER.request(
+        RendererRequest::SetAmbientLighting {
+            ambient: color.extend(1.0),
+        },
+        &[],
+    );
+
+    let _ = result.unwrap();
+}
+
+/// Update the skybox with the given lump containing [TextureData].
+pub fn set_skybox(texture: &Lump) {
+    let (result, _) = RENDERER.request(
+        RendererRequest::SetSkybox {
+            texture: texture.get_id(),
+        },
+        &[],
+    );
+
+    let _ = result.unwrap();
+}
+
+/// A directional light.
+pub struct DirectionalLight(Capability);
+
+impl Drop for DirectionalLight {
+    fn drop(&mut self) {
+        self.0.kill();
+    }
+}
+
+impl DirectionalLight {
+    /// Create a new directional light.
+    pub fn new(state: DirectionalLightState) -> Self {
+        let (result, caps) = RENDERER.request(
+            RendererRequest::AddDirectionalLight {
+                initial_state: state,
+            },
+            &[],
+        );
+
+        let _ = result.expect("failed to create directional light");
+
+        Self(caps.first().unwrap().clone())
+    }
+
+    /// Internal helper function to update this light.
+    fn update(&self, update: DirectionalLightUpdate) {
+        self.0.send(&update, &[]);
+    }
+
+    /// Set this directional light's color.
+    pub fn set_color(&self, color: Vec3) {
+        self.update(DirectionalLightUpdate::Color(color));
+    }
+
+    /// Set this directional light's intensity.
+    pub fn set_intensity(&self, intensity: f32) {
+        self.update(DirectionalLightUpdate::Intensity(intensity));
+    }
+
+    /// Set this directional light's direction.
+    pub fn set_direction(&self, direction: Vec3) {
+        self.update(DirectionalLightUpdate::Direction(direction));
+    }
+
+    /// Set this distanceal light's distance.
+    pub fn set_distance(&self, distance: f32) {
+        self.update(DirectionalLightUpdate::Distance(distance));
+    }
+}
+
+/// Configuration for the creation of an [Object].
+#[derive(Clone, Debug)]
+pub struct ObjectConfig<'a> {
+    /// A reference to the lump containing this object's [MeshData].
+    pub mesh: &'a Lump,
+
+    /// An optional list of skeleton joint matrices for this object.
+    pub skeleton: Option<Vec<Mat4>>,
+
+    /// The lump containing this object's [MaterialData].
+    pub material: &'a Lump,
+
+    /// The initial transform of this object.
+    pub transform: Mat4,
+}
+
+/// An object.
+pub struct Object(Capability);
+
+impl Drop for Object {
+    fn drop(&mut self) {
+        self.0.kill();
+    }
+}
+
+impl Object {
+    /// Create a new object in the scene with the given [ObjectConfig].
+    pub fn new(config: ObjectConfig) -> Self {
+        let (result, caps) = RENDERER.request(
+            RendererRequest::AddObject {
+                mesh: config.mesh.get_id(),
+                skeleton: config.skeleton,
+                material: config.material.get_id(),
+                transform: config.transform,
+            },
+            &[],
+        );
+
+        let _ = result.expect("failed to create object");
+
+        Self(caps.first().unwrap().clone())
+    }
+
+    /// Updates the transform of this object.
+    pub fn set_transform(&self, transform: Mat4) {
+        self.0.send(&ObjectUpdate::Transform(transform), &[]);
+    }
+
+    /// Update the joint matrices of this mesh.
+    pub fn set_joint_matrices(&self, joints: Vec<Mat4>) {
+        self.0.send(&ObjectUpdate::JointMatrices(joints), &[]);
+    }
+
+    /// Update the joint transforms of this mesh.
+    pub fn set_joint_transforms(&self, joint_global: Vec<Mat4>, inverse_bind: Vec<Mat4>) {
+        self.0.send(
+            &ObjectUpdate::JointTransforms {
+                joint_global,
+                inverse_bind,
+            },
+            &[],
+        );
+    }
+}

kindling/services/skybox/src/lib.rs

@@ -17,9 +17,7 @@
 // along with Hearth. If not, see <https://www.gnu.org/licenses/>.
 
 use hearth_guest::{renderer::*, Lump};
-use kindling_host::prelude::RequestResponse;
-
-type Renderer = RequestResponse<RendererRequest, RendererResponse>;
+use kindling_host::renderer::set_skybox;
 
 /// Helper function to append a skybox image to the cube texture data.
 fn add_face(data: &mut Vec<u8>, image: &[u8]) {
@@ -37,17 +35,11 @@ pub extern "C" fn run() {
     add_face(&mut data, include_bytes!("elyvisions/sh_rt.png"));
     add_face(&mut data, include_bytes!("elyvisions/sh_lf.png"));
 
-    let texture = Lump::load(
-        &serde_json::to_vec(&TextureData {
-            label: None,
-            size: (1024, 1024).into(),
-            data,
-        })
-        .unwrap(),
-    )
-    .get_id();
+    let texture = Lump::load(&TextureData {
+        label: None,
+        size: (1024, 1024).into(),
+        data,
+    });
 
-    let renderer = Renderer::expect_service("hearth.Renderer");
-    let (result, _) = renderer.request(RendererRequest::SetSkybox { texture }, &[]);
-    result.unwrap();
+    set_skybox(&texture);
 }