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#include "WebglContext.h"
#include "MainLoop.h"
#include "Renderer2d.h"
#include "Renderer3d.h"
#include "types.h"
#include "TreeShape.h"
#include "LeafParticleRender.h"
#include "Snowflake.h"
#include <cstdio>
#include <emscripten/fetch.h>
enum Theme {
Default = 0,
Autumn,
Winter,
Spring
};
struct AutumnTheme {
TreeShape tree;
LeafParticleRender leafParticles;
void load(Renderer2d* renderer);
void update(f32 dtSeconds);
void render(Renderer2d* renderer);
void unload();
};
struct WinterTheme {
SnowflakeParticleRenderer spr;
void load(Renderer2d* renderer);
void update(f32 dtSeconds);
void render(Renderer2d* renderer);
void unload();
};
struct SpringTheme {
bool canRenderBunny = false;
Mesh3d bunnyMesh;
void load(Renderer3D* renderer);
void update(f32 dtSeconds);
void render(Renderer3D* renderer);
void unload();
};
void load(Theme theme);
void unload();
void update(f32 dtSeconds, void* userData);
EM_BOOL selectNone(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData);
EM_BOOL selectAutumn(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData);
EM_BOOL selectWinter(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData);
EM_BOOL selectSpring(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData);
WebglContext context;
Renderer2d renderer2d;
Renderer3D renderer3d;
MainLoop mainLoop;
Theme activeTheme = Theme::Default;
AutumnTheme autumnTheme;
WinterTheme winterTheme;
SpringTheme springTheme;
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);
emscripten_set_click_callback("#theme_button_winter", NULL, false, selectWinter);
emscripten_set_click_callback("#theme_button_spring", NULL, false, selectSpring);
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;
mainLoop.run(update);
switch (activeTheme) {
case Theme::Autumn:
renderer2d.load(&context);
autumnTheme.load(&renderer2d);
break;
case Theme::Winter:
renderer2d.load(&context);
winterTheme.load(&renderer2d);
break;
case Theme::Spring:
renderer3d.load(&context);
springTheme.load(&renderer3d);
break;
default:
break;
}
}
void update(f32 dtSeconds, void* userData) {
// -- Update
switch (activeTheme) {
case Theme::Autumn:
autumnTheme.update(dtSeconds);
break;
case Theme::Winter:
winterTheme.update(dtSeconds);
break;
case Theme::Spring:
springTheme.update(dtSeconds);
break;
default:
break;
}
// -- Render
switch (activeTheme) {
case Theme::Autumn:
renderer2d.render();
autumnTheme.render(&renderer2d);
break;
case Theme::Winter:
renderer2d.render();
winterTheme.render(&renderer2d);
break;
case Theme::Spring:
renderer3d.render();
springTheme.render(&renderer3d);
break;
default:
break;
}
}
void unload() {
switch (activeTheme) {
case Theme::Autumn:
autumnTheme.unload();
break;
case Theme::Winter:
winterTheme.unload();
break;
case Theme::Spring:
springTheme.unload();
break;
default:
break;
}
activeTheme = Theme::Default;
if (mainLoop.isRunning) {
mainLoop.stop();
renderer2d.unload();
renderer3d.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;
}
EM_BOOL selectWinter(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData) {
printf("Winter theme selected\n");
load(Theme::Winter);
return true;
}
EM_BOOL selectSpring(int eventType, const EmscriptenMouseEvent* mouseEvent, void* userData) {
printf("Spring theme selected\n");
load(Theme::Spring);
return true;
}
// -- Autumn theme
void AutumnTheme::load(Renderer2d* renderer) {
renderer->clearColor = Vector4(252, 210, 153, 255).toNormalizedColor();
auto lr = tree.load(renderer);
leafParticles.load(renderer, &lr);
}
void AutumnTheme::update(f32 dtSeconds) {
tree.update(dtSeconds);
leafParticles.update(dtSeconds);
}
void AutumnTheme::render(Renderer2d* renderer) {
tree.render(renderer);
leafParticles.render(renderer);
}
void AutumnTheme::unload() {
tree.unload();
leafParticles.unload();
}
// -- Winter theme
void WinterTheme::load(Renderer2d* renderer) {
renderer->clearColor = Vector4(200, 229, 239, 255).toNormalizedColor();
SnowflakeLoadParameters lp;
lp.spawnIntervalSeconds = 0.05;
spr.load(lp, renderer);
}
void WinterTheme::update(f32 dtSeconds) {
spr.update(dtSeconds);
}
void WinterTheme::render(Renderer2d* renderer) {
spr.render(renderer);
}
void WinterTheme::unload() {
spr.unload();
}
// -- Spring theme
void onBunnySuccess(emscripten_fetch_t *fetch) {
springTheme.canRenderBunny = true;
printf("Finished downloading %llu bytes from URL %s.\n", fetch->numBytes, fetch->url);
const i32 len = fetch->numBytes;
springTheme.bunnyMesh = Mesh3d_fromObj(&renderer3d, fetch->data, len);
// The data is now available at fetch->data[0] through fetch->data[fetch->numBytes-1];
emscripten_fetch_close(fetch); // Free data associated with the fetch.
}
void onBunnyFail(emscripten_fetch_t *fetch) {
printf("Downloading %s failed, HTTP failure status code: %d.\n", fetch->url, fetch->status);
emscripten_fetch_close(fetch); // Also free data on failure.
}
void SpringTheme::load(Renderer3D* renderer) {
canRenderBunny = false;
renderer->clearColor = Vector4(160, 231, 160, 255.f).toNormalizedColor();
emscripten_fetch_attr_t attr;
emscripten_fetch_attr_init(&attr);
strcpy(attr.requestMethod, "GET");
attr.attributes = EMSCRIPTEN_FETCH_LOAD_TO_MEMORY;
attr.onsuccess = onBunnySuccess;
attr.onerror = onBunnyFail;
emscripten_fetch(&attr, "themes/resources/bunny.obj");
}
void SpringTheme::update(f32 dtSeconds) {
}
void SpringTheme::render(Renderer3D* renderer) {
renderer->render();
if (canRenderBunny) {
bunnyMesh.render(renderer);
}
}
void SpringTheme::unload() {
bunnyMesh.unload();
}
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