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// This file is part of the 64k demo project.
// Standalone "mini-demo" for testing the 3D renderer.
#include "3d/camera.h"
#include "3d/object.h"
#include "3d/renderer.h"
#include "3d/scene.h"
#include "platform.h"
#include <iostream>
#include <vector>
#include <cmath>
#include <cstring>
#if defined(DEMO_CROSS_COMPILE_WIN32)
#include <webgpu/webgpu.h>
#else
#include <webgpu.h>
#endif
// Global State
static Renderer3D g_renderer;
static Scene g_scene;
static Camera g_camera;
static WGPUDevice g_device = nullptr;
static WGPUQueue g_queue = nullptr;
static WGPUSurface g_surface = nullptr;
static WGPUAdapter g_adapter = nullptr;
static WGPUTextureFormat g_format = WGPUTextureFormat_Undefined;
static int g_width = 1280;
static int g_height = 720;
// Reimplementing basic WebGPU init here
void init_wgpu() {
WGPUInstance instance = wgpuCreateInstance(nullptr);
if (!instance) {
std::cerr << "Failed to create WGPU instance." << std::endl;
exit(1);
}
g_surface = platform_create_wgpu_surface(instance);
if (!g_surface) {
std::cerr << "Failed to create WGPU surface." << std::endl;
exit(1);
}
WGPURequestAdapterOptions adapter_opts = {};
adapter_opts.compatibleSurface = g_surface;
adapter_opts.powerPreference = WGPUPowerPreference_HighPerformance;
#if defined(DEMO_CROSS_COMPILE_WIN32)
auto on_adapter = [](WGPURequestAdapterStatus status, WGPUAdapter adapter,
const char* message, void* userdata) {
if (status == WGPURequestAdapterStatus_Success) {
*(WGPUAdapter*)userdata = adapter;
} else {
std::cerr << "Adapter Error: " << (message ? message : "null") << std::endl;
}
};
wgpuInstanceRequestAdapter(instance, &adapter_opts, on_adapter, &g_adapter);
#else
auto on_adapter = [](WGPURequestAdapterStatus status, WGPUAdapter adapter,
WGPUStringView message, void* userdata, void* user2) {
if (status == WGPURequestAdapterStatus_Success) {
*(WGPUAdapter*)userdata = adapter;
} else {
std::cerr << "Adapter Error: " << (message.data ? message.data : "null") << std::endl;
}
};
WGPURequestAdapterCallbackInfo adapter_cb = {};
adapter_cb.mode = WGPUCallbackMode_WaitAnyOnly;
adapter_cb.callback = on_adapter;
adapter_cb.userdata1 = &g_adapter;
wgpuInstanceRequestAdapter(instance, &adapter_opts, adapter_cb);
#endif
// Spin wait for adapter
#if !defined(DEMO_CROSS_COMPILE_WIN32)
while (!g_adapter) {
wgpuInstanceProcessEvents(instance);
}
#endif
if (!g_adapter) {
std::cerr << "Failed to get adapter." << std::endl;
exit(1);
}
WGPUDeviceDescriptor device_desc = {};
#if defined(DEMO_CROSS_COMPILE_WIN32)
auto on_device = [](WGPURequestDeviceStatus status, WGPUDevice device,
const char* message, void* userdata) {
if (status == WGPURequestDeviceStatus_Success) {
*(WGPUDevice*)userdata = device;
}
};
wgpuAdapterRequestDevice(g_adapter, &device_desc, on_device, &g_device);
#else
auto on_device = [](WGPURequestDeviceStatus status, WGPUDevice device,
WGPUStringView message, void* userdata, void* user2) {
if (status == WGPURequestDeviceStatus_Success) {
*(WGPUDevice*)userdata = device;
}
};
WGPURequestDeviceCallbackInfo device_cb = {};
device_cb.mode = WGPUCallbackMode_WaitAnyOnly;
device_cb.callback = on_device;
device_cb.userdata1 = &g_device;
wgpuAdapterRequestDevice(g_adapter, &device_desc, device_cb);
#endif
#if !defined(DEMO_CROSS_COMPILE_WIN32)
// Poll until device is ready (WaitAny is unimplemented in current wgpu-native build)
while (!g_device) {
wgpuInstanceProcessEvents(instance);
}
#endif
if (!g_device) {
std::cerr << "Failed to get device." << std::endl;
exit(1);
}
g_queue = wgpuDeviceGetQueue(g_device);
WGPUSurfaceCapabilities caps = {};
wgpuSurfaceGetCapabilities(g_surface, g_adapter, &caps);
g_format = caps.formats[0];
WGPUSurfaceConfiguration config = {};
config.device = g_device;
config.format = g_format;
config.usage = WGPUTextureUsage_RenderAttachment;
config.width = g_width;
config.height = g_height;
config.presentMode = WGPUPresentMode_Fifo;
config.alphaMode = WGPUCompositeAlphaMode_Opaque;
wgpuSurfaceConfigure(g_surface, &config);
}
void setup_scene() {
g_scene.clear();
// Center Red Cube
Object3D center;
center.position = vec3(0, 0, 0);
center.color = vec4(1, 0, 0, 1);
g_scene.add_object(center);
// Orbiting Green Cubes
for (int i = 0; i < 8; ++i) {
Object3D obj;
float angle = (i / 8.0f) * 6.28318f;
obj.position = vec3(std::cos(angle) * 4.0f, 0, std::sin(angle) * 4.0f);
obj.scale = vec3(0.5f, 0.5f, 0.5f);
obj.color = vec4(0, 1, 0, 1);
g_scene.add_object(obj);
}
}
int main() {
platform_init_window(false);
init_wgpu();
g_renderer.init(g_device, g_queue, g_format);
g_renderer.resize(g_width, g_height);
setup_scene();
g_camera.position = vec3(0, 5, 10);
g_camera.target = vec3(0, 0, 0);
float time = 0.0f;
while (!platform_should_close()) {
platform_poll();
time += 0.016f; // Approx 60fps
// Animate Objects
for (size_t i = 1; i < g_scene.objects.size(); ++i) {
g_scene.objects[i].rotation = quat::from_axis(vec3(0, 1, 0), time * 2.0f + i);
g_scene.objects[i].position.y = std::sin(time * 3.0f + i) * 1.5f;
}
// Animate Camera Height and Radius
float cam_radius = 10.0f + std::sin(time * 0.3f) * 4.0f;
float cam_height = 5.0f + std::cos(time * 0.4f) * 3.0f;
g_camera.set_look_at(
vec3(std::sin(time * 0.5f) * cam_radius, cam_height, std::cos(time * 0.5f) * cam_radius),
vec3(0, 0, 0),
vec3(0, 1, 0)
);
// Render Frame
WGPUSurfaceTexture surface_tex;
wgpuSurfaceGetCurrentTexture(g_surface, &surface_tex);
if (surface_tex.status == WGPUSurfaceGetCurrentTextureStatus_SuccessOptimal) {
WGPUTextureViewDescriptor view_desc = {};
view_desc.format = g_format;
view_desc.dimension = WGPUTextureViewDimension_2D;
view_desc.baseMipLevel = 0;
view_desc.mipLevelCount = 1;
view_desc.baseArrayLayer = 0;
view_desc.arrayLayerCount = 1;
view_desc.aspect = WGPUTextureAspect_All;
WGPUTextureView view = wgpuTextureCreateView(surface_tex.texture, &view_desc);
g_renderer.render(g_scene, g_camera, time, view);
wgpuTextureViewRelease(view);
wgpuSurfacePresent(g_surface);
wgpuTextureRelease(surface_tex.texture);
}
#if !defined(DEMO_CROSS_COMPILE_WIN32)
// Poll events for wgpu-native to ensure callbacks fire and frame presents?
// We don't have easy access to instance here unless we store it globally.
// Let's just assume Present handles enough synchronization for this demo.
#endif
}
g_renderer.shutdown();
platform_shutdown();
return 0;
}
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