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// This file is part of the 64k demo project.
// It implements platform-specific windowing and input using GLFW.
// Handles fullscreen toggling and native surface creation for WebGPU.
#include "platform.h"
#include "glfw3webgpu.h"
#include <GLFW/glfw3.h>
// --- Callbacks ---
static void framebuffer_size_callback(GLFWwindow* window, int width,
int height) {
PlatformState* state = (PlatformState*)glfwGetWindowUserPointer(window);
if (state) {
state->width = width;
state->height = height;
if (height > 0) {
state->aspect_ratio = (float)width / (float)height;
}
}
}
static void glfw_key_callback(GLFWwindow* window, int key, int scancode,
int action, int mods) {
PlatformState* state = (PlatformState*)glfwGetWindowUserPointer(window);
if (action == GLFW_PRESS) {
if (key == GLFW_KEY_ESCAPE || key == GLFW_KEY_Q) {
glfwSetWindowShouldClose(window, GLFW_TRUE);
} else if (key == GLFW_KEY_F) {
if (state)
platform_toggle_fullscreen(state);
}
}
}
// --- Public API Implementation ---
PlatformState platform_init(bool fullscreen, int width, int height) {
PlatformState state = {};
state.width = width;
state.height = height;
state.is_fullscreen = fullscreen;
glfwInit();
glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
state.window =
glfwCreateWindow(state.width, state.height, "demo64k", nullptr, nullptr);
// Immediately query the actual framebuffer size for high-DPI displays
glfwGetFramebufferSize(state.window, &state.width, &state.height);
if (state.height > 0) {
state.aspect_ratio = (float)state.width / (float)state.height;
}
// Store our state in a static pointer or use the window pointer?
// We'll use a pointer to a persistent state.
// For this demo, we can assume the PlatformState persists in main().
// But we return by value. This is a bit tricky with callbacks.
// We'll fix the callbacks in platform_poll if needed, or just let main pass
// the pointer back.
glfwSetWindowUserPointer(state.window,
nullptr); // Will be set in main's state
glfwSetKeyCallback(state.window, glfw_key_callback);
glfwSetFramebufferSizeCallback(state.window, framebuffer_size_callback);
if (fullscreen) {
glfwGetWindowPos(state.window, &state.windowed_x, &state.windowed_y);
glfwGetWindowSize(state.window, &state.windowed_w, &state.windowed_h);
GLFWmonitor* monitor = glfwGetPrimaryMonitor();
const GLFWvidmode* mode = glfwGetVideoMode(monitor);
glfwSetWindowMonitor(state.window, monitor, 0, 0, mode->width, mode->height,
mode->refreshRate);
}
state.time = glfwGetTime();
return state;
}
void platform_shutdown(PlatformState* state) {
if (state->window) {
glfwDestroyWindow(state->window);
}
glfwTerminate();
}
void platform_poll(PlatformState* state) {
// Ensure the window has the current state pointer for callbacks
if (glfwGetWindowUserPointer(state->window) != state) {
glfwSetWindowUserPointer(state->window, state);
}
glfwPollEvents();
state->time = glfwGetTime();
if (state->height > 0) {
state->aspect_ratio = (float)state->width / (float)state->height;
}
}
bool platform_should_close(PlatformState* state) {
return glfwWindowShouldClose(state->window);
}
void platform_toggle_fullscreen(PlatformState* state) {
state->is_fullscreen = !state->is_fullscreen;
if (state->is_fullscreen) {
glfwGetWindowPos(state->window, &state->windowed_x, &state->windowed_y);
glfwGetWindowSize(state->window, &state->windowed_w, &state->windowed_h);
GLFWmonitor* monitor = glfwGetPrimaryMonitor();
const GLFWvidmode* mode = glfwGetVideoMode(monitor);
glfwSetWindowMonitor(state->window, monitor, 0, 0, mode->width,
mode->height, mode->refreshRate);
} else {
glfwSetWindowMonitor(state->window, nullptr, state->windowed_x,
state->windowed_y, state->windowed_w,
state->windowed_h, 0);
}
}
WGPUSurface platform_create_wgpu_surface(WGPUInstance instance,
PlatformState* state) {
return glfwCreateWindowWGPUSurface(instance, state->window);
}
double platform_get_time() {
return glfwGetTime();
}
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