1. Assets 1. Ресурсы

2. Project Structure 2. Структура проекта

Create a project folder named pysdl3-image-app. You can keep your assets in an assets/images directory.

Создайте папку проекта с именем pysdl3-image-app. Вы можете хранить свои ресурсы в директории assets/images.

pysdl3-image-app/
├── assets/images/
│   └── right-arrow.png
└── main.py

3. Source Code 3. Исходный код

Copy this code into main.py:

Скопируйте этот код в файл main.py:

import ctypes
import os

# REQUIRED: Set environment variables BEFORE importing sdl3
os.environ["SDL_MAIN_USE_CALLBACKS"] = "1"
os.environ["SDL_RENDER_DRIVER"] = "opengl"

import sdl3

# Initialize global pointers
renderer = ctypes.POINTER(sdl3.SDL_Renderer)()
window = ctypes.POINTER(sdl3.SDL_Window)()
texture = ctypes.POINTER(sdl3.SDL_Texture)()

@sdl3.SDL_AppInit_func
def SDL_AppInit(appstate, argc, argv):
    global texture, window, renderer
    
    if not sdl3.SDL_Init(sdl3.SDL_INIT_VIDEO):
        return sdl3.SDL_APP_FAILURE

    if not sdl3.SDL_CreateWindowAndRenderer("PySDL3 Image".encode(), 250, 250, 0, window, renderer):
        return sdl3.SDL_APP_FAILURE

    # Assuming crate.png works as in your "good" example
    texturePath = "assets/images/right-arrow.png".encode()
    
    # We call the loader; it will initialize the image subsystem internally if needed
    texture = sdl3.IMG_LoadTexture(renderer, texturePath)
    
    if not texture:
        sdl3.SDL_Log("Failed to load texture: %s".encode() % sdl3.SDL_GetError())
        return sdl3.SDL_APP_FAILURE

    return sdl3.SDL_APP_CONTINUE

@sdl3.SDL_AppEvent_func
def SDL_AppEvent(appstate, event):
    if sdl3.SDL_DEREFERENCE(event).type == sdl3.SDL_EVENT_QUIT:
        return sdl3.SDL_APP_SUCCESS
    return sdl3.SDL_APP_CONTINUE

@sdl3.SDL_AppIterate_func
def SDL_AppIterate(appstate):
    sdl3.SDL_SetRenderDrawColor(renderer, 100, 100, 100, 255)
    sdl3.SDL_RenderClear(renderer)

    srcRect = sdl3.SDL_FRect(0.0, 0.0, 512.0, 512.0)
    destRect = sdl3.SDL_FRect(50.0, 50.0, 100.0, 100.0)
    
    # Pass by reference to ensure the C-side receives the correct memory address
    sdl3.SDL_RenderTexture(renderer, texture, ctypes.byref(srcRect), ctypes.byref(destRect))

    sdl3.SDL_RenderPresent(renderer)
    return sdl3.SDL_APP_CONTINUE

@sdl3.SDL_AppQuit_func
def SDL_AppQuit(appstate, result):
    global texture
    if texture:
        sdl3.SDL_DestroyTexture(texture)

4. Running the Application 4. Запуск приложения