From c8938fe29132a11126013ed1b010c3092f5645e4 Mon Sep 17 00:00:00 2001
From: Matt Kosarek <matt.kosarek@canonical.com>
Date: Wed, 8 Jul 2026 09:07:55 -0400
Subject: feature: improved summer scene

---
 themes/src/summer/water_model.h | 70 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 themes/src/summer/water_model.h

(limited to 'themes/src/summer/water_model.h')

diff --git a/themes/src/summer/water_model.h b/themes/src/summer/water_model.h
new file mode 100644
index 0000000..a99f91d
--- /dev/null
+++ b/themes/src/summer/water_model.h
@@ -0,0 +1,70 @@
+#ifndef WATER_MODEL_H
+#define WATER_MODEL_H
+
+#include "../mathlib.h"
+#include "../shader.h"
+#include "../types.h"
+
+struct WebglContext;
+
+/// A water mesh is a 3D plane in the simulation world.
+///
+/// The mesh reflects the sun above it and refracts whatever is
+/// below its surface. It owns its own shader, geometry buffers,
+/// and perspective camera, so it is fully standalone.
+///
+/// The mesh can be rendered and updated.
+class WaterModel {
+public:
+    WaterModel(Vector3 position, Vector3 size);
+    ~WaterModel();
+
+    /// Compile the water shader, build the grid mesh, and set up the camera.
+    void load(WebglContext* context);
+    void update(f32 dtSeconds);
+    void render();
+    void unload();
+
+    /// Direction pointing toward the sun (normalized internally) and its color,
+    /// used to fake the surface reflection.
+    void setSun(Vector3 direction, Vector4 color);
+
+private:
+    Vector3 position;
+    Vector3 size;
+
+    WebglContext* context = nullptr;
+    Shader shader = 0;
+    u32 vao = 0;
+    u32 vbo = 0;
+    u32 ebo = 0;
+    i32 numIndices = 0;
+    f32 elapsedTime = 0.f;
+
+    Mat4x4 projection;
+    Mat4x4 view;
+    Mat4x4 model;
+
+    Vector3 cameraPos;
+    Vector3 sunDir;
+    Vector3 sunColor;
+
+    static const i32 RES = 200;
+
+    struct {
+        i32 position = -1;
+    } attributes;
+
+    struct {
+        i32 projection = -1;
+        i32 view = -1;
+        i32 model = -1;
+        i32 time = -1;
+        i32 amplitude = -1;
+        i32 cameraPos = -1;
+        i32 sunDir = -1;
+        i32 sunColor = -1;
+    } uniforms;
+};
+
+#endif // WATER_MODEL_H
-- 
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