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#include "SpringTheme.hpp"
#include "../Renderer3d.h"
#include "../shader_fetcher.hpp"
#include <cstdio>
#include <emscripten/fetch.h>
void onBunnySuccess(emscripten_fetch_t *fetch) {
SpringTheme* springTheme = (SpringTheme*)fetch->userData;
springTheme->state = SpringThemeState::LoadedBunny;
printf("Finished downloading %llu bytes from URL %s.\n", fetch->numBytes, fetch->url);
const i32 len = fetch->numBytes;
springTheme->bunnyMesh = Mesh3d_fromObj(&springTheme->renderer, 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.
}
inline void fetch_bunny(SpringTheme* theme) {
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;
auto* bunny_fetch = emscripten_fetch(&attr, "themes/resources/bunny.obj");
bunny_fetch->userData = theme;
}
inline void on_shaders_loader(ShaderFetchResult* result) {
SpringTheme* theme = (SpringTheme*)result->user_data;
theme->renderer.load(theme->renderer.context, result->vertex.c_str(), result->fragment.c_str());
theme->state = SpringThemeState::LoadedShader;
fetch_bunny(theme);
}
void SpringTheme::load(WebglContext* context) {
state = SpringThemeState::Loading;
renderer.context = context;
renderer.clearColor = Vector4(160, 231, 160, 255.f).toNormalizedColor();
fetch_shader(
{
"themes/src/shaders/renderer3d.vert",
"themes/src/shaders/renderer3d.frag"
},
on_shaders_loader,
this
);
}
inline Vector3 bunnyLerp(Vector3& start, Vector3& target, f32 t) {
t = 3 * t *t - 2 * t * t * t;
return start + ((target - start) * t);
}
inline f32 verticalHopLerp(f32 start, f32 target, f32 t) {
f32 ogt = t;
t = 3 * t *t - 2 * t * t * t;
if (ogt >= 0.5f) t = 1.f - t;
return start + ((target - start) * t);
}
inline f32 rotationLerp(f32 start, f32 target, f32 t) {
return start + ((target - start) * t);
}
void SpringTheme::update(f32 dtSeconds) {
switch (state) {
case SpringThemeState::Loading: return;
case SpringThemeState::LoadedShader: return;
case SpringThemeState::LoadedBunny:
state = SpringThemeState::Idle;
stateTimer = 0.f;
bunnyHopAnimationTimer = 0.f;
break;
case SpringThemeState::Idle: {
bunnyHopAnimationTimer += dtSeconds;
const f32 HOP_FREQUENCY = 6.f;
if (bunnyHopAnimationTimer > stateTimer) {
state = SpringThemeState::PreHop;
f32 xDir = 1;
f32 yDir = 1;
if (bunnyTarget.x > 0) xDir = -1;
if (bunnyTarget.z > 0) yDir = -1;
bunnyTarget = bunnyPosition + Vector3(randomFloatBetween(0, xDir * 25), 0, randomFloatBetween(0, yDir * 25));
auto direction = (bunnyTarget - bunnyPosition);
auto distance = direction.length();
direction = direction.normalize();
numHops = ceil(distance / HOP_FREQUENCY);
hopCount = 0;
targetRotation = PI - atan2(direction.y, direction.x);
stateTimer = ((bunnyTarget - bunnyPosition).length() / bunnySpeed) / numHops;
bunnyHopAnimationTimer = 0.f;
hopIncrement = (bunnyTarget - bunnyPosition) / numHops;
}
break;
}
case SpringThemeState::PreHop: {
const f32 ROTATION_TIME = 0.5f;
bunnyHopAnimationTimer += dtSeconds;
f32 current = bunnyRotation + (targetRotation - bunnyRotation) * (bunnyHopAnimationTimer / ROTATION_TIME);
bunnyMesh.model = Mat4x4().rotate(0, current, 0).translate(bunnyPosition);
if (bunnyHopAnimationTimer > ROTATION_TIME) {
bunnyRotation = targetRotation;
bunnyHopAnimationTimer = 0;
state = SpringThemeState::Hopping;
}
break;
}
case SpringThemeState::Hopping: {
bunnyHopAnimationTimer += dtSeconds;
f32 t = bunnyHopAnimationTimer / stateTimer;
Vector3 nextPosition = bunnyPosition + hopIncrement;
auto renderPos = bunnyLerp(bunnyPosition, nextPosition, t);
if ((renderPos - nextPosition).length() < 0.01f) {
hopCount += 1;
bunnyHopAnimationTimer = 0.f;
bunnyPosition = nextPosition;
}
renderPos.y = verticalHopLerp(0.f, 4.f, t);
const f32 RMAX = PI / 16.f;
f32 zRotation = 0;
f32 start = 0.f;
f32 end = PI / 8.f;
f32 startTime = 0.f;
f32 endTime = 0.f;
bool disableRot = false;
if (t >= 0.9f) {
disableRot = true;
}
else if (t >= 0.7f) {
start = -RMAX;
end = 0.f;
startTime = 0.7f;
endTime = 0.9f;
}
else if (t >= 0.50f) {
start = 0.f;
end = -RMAX;
startTime = 0.50f;
endTime = 0.70f;
}
else if (t >= 0.40f) {
disableRot = true;
}
else if (t >= 0.20f) {
start = RMAX;
end = 0.f;
startTime = 0.20f;
endTime = 0.40f;
}
else {
start = 0.f;
end = RMAX;
startTime = 0.f;
endTime = 0.20f;
}
if (!disableRot) {
f32 totalTime = endTime - startTime;
zRotation = rotationLerp(start, end, (totalTime - (endTime - t)) / totalTime);
}
bunnyMesh.model = Mat4x4().getZRotationMatrix(zRotation).rotate(0, bunnyRotation, 0).translate(renderPos);
if (hopCount == numHops) {
bunnyPosition = bunnyTarget;
bunnyHopAnimationTimer = 0.f;
state = SpringThemeState::Idle;
stateTimer = randomFloatBetween(0.5f, 1.f);
}
break;
}
}
}
void SpringTheme::render() {
renderer.render();
if (state != SpringThemeState::Loading) {
bunnyMesh.render(&renderer);
}
}
void SpringTheme::unload() {
renderer.unload();
bunnyMesh.unload();
}
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