Initial commit

1 files changed, 142 insertions, 0 deletions

diff --git a/txtgameengine/app.py b/txtgameengine/app.py
new file mode 100644
index 0000000..a8c9913
--- /dev/null
+++ b/txtgameengine/app.py
@@ -0,0 +1,142 @@
+import glfw
+from vulkan import *
+import time
+
+
+class PlatformError(Exception):
+    pass
+
+
+class QueueFamilies:
+    graphics_i: int
+    graphics: object
+
+
+class PlatformComponent:
+    def __init__(self, app: 'TxtGameApp'):
+        self.app = app
+
+    def init(self):
+        glfw.init()
+        self.init_vulkan()
+        self.init_window()
+
+    def init_vulkan(self):
+        self.create_instance()
+        self.pick_physical_device()
+        self.create_logical_device()
+
+    def is_device_suitable(self, device):
+        return 1
+
+    def pick_physical_device(self):
+        devices = [(d, self.is_device_suitable(d))
+                   for d in vkEnumeratePhysicalDevices(self.instance)]
+        if len(devices) == 0:
+            raise PlatformError("No vulkan devices available.")
+        device, rating = sorted(devices, key=lambda x: x[1])[-1]
+        if rating < 0:
+            raise PlatformError("No suitable devices available.")
+        self.physical_device = device
+        self.find_queue_families()
+
+    def find_queue_families(self):
+        self.queues = QueueFamilies()
+        for i, queue_family in enumerate(vkGetPhysicalDeviceQueueFamilyProperties(self.physical_device)):
+            if queue_family.queueFlags & VK_QUEUE_GRAPHICS_BIT:
+                self.queues.graphics_i = i
+
+    def create_logical_device(self):
+        queue_create_info = [VkDeviceQueueCreateInfo(
+            queueFamilyIndex=self.queues.graphics_i,
+            queueCount=1,
+            pQueuePriorities=[1],
+            flags=0,
+        )]
+        device_create = VkDeviceCreateInfo(
+            pQueueCreateInfos=queue_create_info,
+            pEnabledFeatures=vkGetPhysicalDeviceFeatures(self.physical_device),
+            flags=0,
+            ppEnabledLayerNames=self.layers,
+            ppEnabledExtensionNames=[],
+        )
+        self.logical_device = vkCreateDevice(
+            self.physical_device, device_create, None)
+        self.queues.graphic = vkGetDeviceQueue(
+            device=self.logical_device,
+            queueFamilyIndex=self.queues.graphics_i,
+            queueIndex=0,
+        )
+
+    def create_instance(self):
+        app_info = VkApplicationInfo(
+            pApplicationName=self.app.name,
+            applicationVersion=VK_MAKE_VERSION(1, 0, 0),
+            pEngineName="TxtGameEngine",
+            engineVersion=VK_MAKE_VERSION(1, 0, 0),
+            apiVersion=VK_API_VERSION_1_0,
+        )
+        extensions = glfw.get_required_instance_extensions()
+        present_layers = vkEnumerateInstanceLayerProperties()
+        missing_layers = set(self.app.requested_validation_layers) - \
+            set(l.layerName for l in present_layers)
+        if missing_layers:
+            raise PlatformError(
+                "Missing validation layers: "+str(missing_layers))
+        self.layers = self.app.requested_validation_layers
+        createInfo = VkInstanceCreateInfo(
+            pApplicationInfo=app_info,
+            flags=0,
+            enabledExtensionCount=len(extensions),
+            ppEnabledExtensionNames=extensions,
+            enabledLayerCount=len(self.layers),
+            ppEnabledLayerNames=self.layers,
+        )
+        self.instance = vkCreateInstance(createInfo, None)
+
+    def init_window(self):
+        glfw.window_hint(glfw.CLIENT_API, glfw.NO_API)
+        glfw.window_hint(glfw.RESIZABLE, glfw.FALSE)
+        self.window = glfw.create_window(
+            *self.app.size, self.app.name, None, None)
+        if not self.window:
+            raise PlatformError("Failed to initialize glfw window")
+
+    @property
+    def should_close(self) -> bool:
+        return glfw.window_should_close(self.window)
+
+    @should_close.setter
+    def should_close(self, val: bool):
+        glfw.set_window_should_close(val)
+
+    def poll_events(self):
+        glfw.poll_events()
+
+    def cleanup(self):
+        vkDestroyDevice(self.logical_device)
+        vkDestroyInstance(self.instance)
+        glfw.destroy_window(window)
+        glfw.terminate()
+
+
+class TxtGameApp:
+    PLATFORM_CLASS = PlatformComponent
+
+    def __init__(self, size: (int, int), name: str):
+        self.size = size
+        self.name = name
+        self.platform: self.PLATFORM_CLASS = self.PLATFORM_CLASS(self)
+        self.requested_validation_layers = []
+
+    def start(self):
+        self.platform.init()
+        last_update_time = time.monotonic()
+        while not self.platform.should_close:
+            update_time = time.monotonic()
+            self.platform.poll_events()
+            self.update(update_time - last_update_time)
+            last_update_time = update_time
+
+    def update(self, delta: float):
+        raise NotImplementedError