From de850676e79da39aec6f1ce0400cfa94cecbd744 Mon Sep 17 00:00:00 2001
From: mattkae <mattkae@protonmail.com>
Date: Sun, 19 Sep 2021 16:32:15 -0400
Subject: First commit

---
 themes/main.cpp | 128 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 themes/main.cpp

(limited to 'themes/main.cpp')

diff --git a/themes/main.cpp b/themes/main.cpp
new file mode 100644
index 0000000..7941153
--- /dev/null
+++ b/themes/main.cpp
@@ -0,0 +1,128 @@
+#include "WebglContext.h"
+#include "MainLoop.h"
+#include "Renderer2d.h"
+#include "types.h"
+#include "TreeShape.h"
+
+enum Theme {
+	Default = 0,
+    Autumn
+};
+
+struct AutumnTheme {
+	TreeShape tree;
+
+	void load(Renderer2d* renderer);
+	void update(float32 dtSeconds);
+	void render(Renderer2d* renderer);
+	void unload();
+};
+
+void load(Theme theme);
+void unload();
+void update(float32 dtSeconds, void* userData);
+EM_BOOL selectNone(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData);
+EM_BOOL selectAutumn(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData);
+
+WebglContext context;
+Renderer2d renderer;
+MainLoop mainLoop;
+Theme activeTheme = Theme::Default;
+AutumnTheme autumnTheme;
+
+int main() {
+	context.init("#theme_canvas");
+	emscripten_set_click_callback("#theme_button_default", NULL, false, selectNone);
+	emscripten_set_click_callback("#theme_button_autumn", NULL, false, selectAutumn);
+	
+	return 0;
+}
+
+// -- Scene loading, updating, and unloading logic
+void load(Theme theme) {
+	if (activeTheme == theme) {
+		printf("This theme is already active.\n");
+		return;
+	}
+
+    unload(); // Try and unload before we load, so that we start fresh
+
+	activeTheme = theme;
+	renderer.load(&context);
+	mainLoop.run(update);
+
+	switch (activeTheme) {
+	case Theme::Autumn:
+		autumnTheme.load(&renderer);
+		break;
+	default:
+		break;
+	}
+}
+
+void update(float32 dtSeconds, void* userData) {
+	// -- Update
+	switch (activeTheme) {
+	case Theme::Autumn:
+		autumnTheme.update(dtSeconds);
+		break;
+	default:
+		break;
+	}
+	
+	// -- Render
+	renderer.render();
+	switch (activeTheme) {
+	case Theme::Autumn:
+		autumnTheme.render(&renderer);
+		break;
+	default:
+		break;
+	}
+}
+
+void unload() {
+	switch (activeTheme) {
+	case Theme::Autumn:
+		autumnTheme.unload();
+		break;
+	default:
+		break;
+	}
+	
+	activeTheme = Theme::Default;
+	if (mainLoop.isRunning) {
+		mainLoop.stop();
+		renderer.unload();
+	}
+}
+
+// -- HTML5 callbacks
+EM_BOOL selectNone(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData) {
+	printf("Default theme selected\n");
+	unload();
+	return true;
+}
+
+EM_BOOL selectAutumn(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData) {
+	printf("Autumn theme selected\n");
+	load(Theme::Autumn);
+	return true;
+}
+
+// -- Autumn theme
+void AutumnTheme::load(Renderer2d* renderer) {
+	tree.load(renderer);
+}
+
+void AutumnTheme::update(float32 dtSeconds) {
+	tree.update(dtSeconds);
+}
+
+void AutumnTheme::render(Renderer2d* renderer) {
+	tree.render(renderer);
+}
+
+void AutumnTheme::unload()  {
+	tree.unload();
+}
-- 
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