def init_gl(self):
'''initialize the opengl resources needed for presenting windows
* a shader program
* a vertex buffer
* a texture for Label windows
'''
self.program = GlProgram(shaders.vertex_flat, shaders.fragment_flat)
self.buffer = gl.GLuint(0)
gl.glGenBuffers(1, pointer(self.buffer))
self.texture = gl.GLuint(0)
gl.glGenTextures(1, pointer(self.texture))
gl.glBindTexture(gl.GL_TEXTURE_2D, self.texture)
gl.glTexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER, gl.GL_NEAREST)
gl.glTexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAG_FILTER, gl.GL_NEAREST)
gl.glTexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_WRAP_S, gl.GL_CLAMP_TO_EDGE)
gl.glTexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_WRAP_T, gl.GL_CLAMP_TO_EDGE)
gl.glBindTexture(gl.GL_TEXTURE_2D, 0)
class WindowManager():
'''
The window manager is responsible for drawing the windows and
for forwarding events to the windows.
It uses a TextManager object to manage the texture resources used by the Label objects.
The window manager creates an invisible root window which is the ancestor to all windows managed.
'''
def __init__(self):
'''initialize the WindowManager'''
self.textmanager = TextManager()
self.root = Window(None, 0, 0, 1, 1)
self.root.manager = self
self.init_gl()
def init_gl(self):
'''initialize the opengl resources needed for presenting windows
* a shader program
* a vertex buffer
* a texture for Label windows
'''
self.program = GlProgram(shaders.vertex_flat, shaders.fragment_flat)
self.buffer = gl.GLuint(0)
gl.glGenBuffers(1, pointer(self.buffer))
self.texture = gl.GLuint(0)
gl.glGenTextures(1, pointer(self.texture))
gl.glBindTexture(gl.GL_TEXTURE_2D, self.texture)
gl.glTexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER, gl.GL_NEAREST)
gl.glTexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAG_FILTER, gl.GL_NEAREST)
gl.glTexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_WRAP_S, gl.GL_CLAMP_TO_EDGE)
gl.glTexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_WRAP_T, gl.GL_CLAMP_TO_EDGE)
gl.glBindTexture(gl.GL_TEXTURE_2D, 0)
def draw(self):
'''
Draw the windows.
'''
self.program.use()
data = list(self.root.get_data(0, 0))
data = (gl.GLfloat * len(data))(*data)
gl.glBindBuffer(gl.GL_ARRAY_BUFFER, self.buffer)
gl.glBufferData(gl.GL_ARRAY_BUFFER, sizeof(data), data, gl.GL_DYNAMIC_DRAW)
gl.glActiveTexture(gl.GL_TEXTURE0)
gl.glBindTexture(gl.GL_TEXTURE_2D, self.texture)
if self.textmanager.dirty:
# only upload the texture to the GPU if it has actually changed
gl.glTexImage2D(gl.GL_TEXTURE_2D,
0, # level
gl.GL_R8,
self.textmanager.width,
self.textmanager.height,
0,
gl.GL_RED,
gl.GL_UNSIGNED_BYTE,
ctypes.create_string_buffer(self.textmanager.img.tobytes()))
self.textmanager.dirty = False
self.program.uniform1i(b"tex", 0) # set to 0 because the texture is bound to GL_TEXTURE0
self.program.vertex_attrib_pointer(self.buffer, b"position", 4)
# self.program.vertex_attrib_pointer(self.buffer, b"texcoord", 2, stride=4 * sizeof(gl.GLfloat), offset=2 * sizeof(gl.GLfloat))
gl.glDrawArrays(gl.GL_QUADS, 0, len(data) // 4)
def on_mouse_press(self, x, y, button, modifiers):
'''forward the event to the root window'''
return self.root.on_mouse_press(x, y, button, modifiers)
def on_resize(self, x, y):
'''update the window manager when the opengl viewport is resized'''
self.program.uniform2f(b'window_size', x, -y)
