def load(self, file_path: str, renderer: SDL_Renderer) -> bool:
temp_surface = SDL_LoadBMP(file_path)
if not temp_surface:
return False
self._texture = SDL_CreateTextureFromSurface(renderer, temp_surface)
SDL_FreeSurface(temp_surface)
if not self._texture:
return False
return True
def _create_texture(self):
text_surface = TTF_RenderText_Shaded(self.font, self._text.encode("UTF-8"), self.text_color,
self.background_color)
if text_surface is None:
raise TTF_GetError()
texture = SDL_CreateTextureFromSurface(self.renderer, text_surface)
if texture is None:
raise SDLError()
SDL_FreeSurface(text_surface)
return texture
def main():
window = sdl2.ext.Window("Hello World",
size=(WIDTH * SCALE, HEIGHT * SCALE))
window.show()
renderer = sdl2.ext.Renderer(window)
game_tex = SDL_CreateTexture(
renderer.sdlrenderer,
SDL_PIXELFORMAT_RGBA8888,
SDL_TEXTUREACCESS_TARGET,
WIDTH,
HEIGHT,
)
temp_tex = SDL_CreateTexture(
renderer.sdlrenderer,
SDL_PIXELFORMAT_RGBA8888,
SDL_TEXTUREACCESS_TARGET,
WIDTH,
HEIGHT,
)
blendmode = SDL_ComposeCustomBlendMode(
# src col factor
sdl2.blendmode.SDL_BLENDFACTOR_ONE,
# dst col factor
sdl2.blendmode.SDL_BLENDFACTOR_ONE,
# color operation
sdl2.blendmode.SDL_BLENDOPERATION_SUBTRACT,
# src alpha factor
sdl2.blendmode.SDL_BLENDFACTOR_SRC_ALPHA,
# dst alpha factor
sdl2.blendmode.SDL_BLENDFACTOR_ZERO,
# alpha operation
sdl2.blendmode.SDL_BLENDOPERATION_ADD,
)
surfaces = {
"link-right": SDL_LoadBMP(b"link-right.bmp"),
"flame": SDL_LoadBMP(b"flame.bmp"),
"overlay": sdl2.sdlimage.IMG_Load(b"overlay.png"),
}
images = {
key: SDL_CreateTextureFromSurface(renderer.sdlrenderer, img)
for key, img in surfaces.items()
}
link_x = 3
flame_x = 20
flame_y = 20
flame_w = 16
flame_h = 16
def draw():
# clear the surface
SDL_RenderClear(renderer.sdlrenderer)
# start rendering to the temporary texture
# which will contain Link with a shadow
SDL_SetRenderTarget(renderer.sdlrenderer, temp_tex)
# with a transparent background
SDL_SetRenderDrawColor(renderer.sdlrenderer, 0, 0, 0, 0)
SDL_RenderClear(renderer.sdlrenderer)
# blit overlay to temp texture
link_target = SDL_Rect(link_x, link_x, 16, 16)
overlay_target = SDL_Rect(flame_x + link_x, flame_y + link_x, 16, 16)
SDL_RenderCopy(renderer.sdlrenderer, images["overlay"], overlay_target,
link_target)
# blit Link to temp texture,
# using his own alpha but subtracting colour from the overlay
link_target = SDL_Rect(link_x, link_x, 16, 16)
SDL_SetTextureBlendMode(images["link-right"], blendmode)
SDL_RenderCopy(renderer.sdlrenderer, images["link-right"], None,
link_target)
# render to the game map
SDL_SetRenderTarget(renderer.sdlrenderer, game_tex)
# with a gloomy red backdrop
SDL_SetRenderDrawColor(renderer.sdlrenderer, 30, 20, 25, 255)
SDL_RenderClear(renderer.sdlrenderer)
# draw the bonfire
target = SDL_Rect(flame_x, flame_y, flame_w, flame_h)
SDL_RenderCopy(renderer.sdlrenderer, images["flame"], None, target)
# draw the game map to the screen, scaled up
SDL_SetTextureBlendMode(temp_tex, SDL_BLENDMODE_BLEND)
SDL_RenderCopy(renderer.sdlrenderer, temp_tex, None, None)
# blit surface onto screen, scaled up
SDL_SetRenderTarget(renderer.sdlrenderer, None)
SDL_RenderCopy(renderer.sdlrenderer, game_tex, None, None)
SDL_RenderPresent(renderer.sdlrenderer)
window.refresh()
running = True
while running:
events = sdl2.ext.get_events()
for event in events:
if event.type == SDL_QUIT:
running = False
break
elif event.type == SDL_KEYDOWN:
if event.key.keysym.sym == sdl2.SDLK_RIGHT:
link_x += 1
sdl2.SDL_Delay(10)
draw()
for image in surfaces.values():
SDL_FreeSurface(image)
window.close()
SDL_Quit()
return 0
def __del__(self, _SDL_FreeSurface=SDL_FreeSurface):
if self._surface:
SDL_FreeSurface(self._surface)
def free(self, surface, _SDL_FreeSurface=SDL_FreeSurface):
SDL_FreeSurface(surface)