def update(self, dt):
self.elapsed_time += dt
mouse_x, mouse_y, buttons_states = self.get_mouse_state()
ImGuiExtra.begin_frame(
int(mouse_x), int(mouse_y), buttons_states, 0, self.width, self.height
)
show_example_dialog()
ImGuiExtra.end_frame()
at = (c_float * 3)(*[0.0, 1.0, 0.0])
eye = (c_float * 3)(*[0.0, 1.0, -2.5])
up = (c_float * 3)(*[0.0, 1.0, 0.0])
view = look_at(eye, at, up)
projection = proj(60.0, self.width / self.height, 0.1, 100.0)
bgfx.setViewTransform(0, as_void_ptr(view), as_void_ptr(projection))
bgfx.setViewRect(0, 0, 0, self.width, self.height)
bgfx.touch(0)
mtx = rotate_xy(0, self.elapsed_time * 0.37)
bgfx.setUniform(
self.time_uniform,
as_void_ptr((c_float * 4)(self.elapsed_time, 0.0, 0.0, 0.0)),
)
self.mesh.submit(0, self.main_program, mtx)
bgfx.frame()
def update(self, dt):
self.elapsed_time += dt
mouse_x, mouse_y, buttons_states = self.get_mouse_state()
ImGuiExtra.begin_frame(
int(mouse_x), int(mouse_y), buttons_states, 0, self.width, self.height
)
show_example_dialog()
self._create_imgui_cubes_selection_dialog()
ImGuiExtra.end_frame()
at = (c_float * 3)(*[0.0, 0.0, 0.0])
eye = (c_float * 3)(*[0.0, 0.0, -35.0])
up = (c_float * 3)(*[0.0, 1.0, 0.0])
view = look_at(eye, at, up)
projection = proj(60.0, self.width / self.height, 0.1, 100.0)
bgfx.setViewTransform(0, as_void_ptr(view), as_void_ptr(projection))
bgfx.setViewRect(0, 0, 0, self.width, self.height)
bgfx.touch(0)
for yy in range(0, 11):
for xx in range(0, 11):
mtx = rotate_xy(
self.elapsed_time + xx * 0.21, self.elapsed_time + yy * 0.37
)
mtx[3, 0] = -15.0 + xx * 3.0
mtx[3, 1] = -15.0 + yy * 3.0
mtx[3, 2] = 0.0
bgfx.setTransform(as_void_ptr(mtx), 1)
# Set vertex and index buffer.
bgfx.setVertexBuffer(0, self.vertex_buffer, 0, num_vertices)
bgfx.setIndexBuffer(
self.index_buffers[self.primitive_geometry.value],
0,
primitives[self.primitive_geometry.value].size,
)
bgfx.setState(
bgfx_states[self.primitive_geometry.value]
| (BGFX_STATE_WRITE_R if self.write_r.value else 0)
| (BGFX_STATE_WRITE_G if self.write_g.value else 0)
| (BGFX_STATE_WRITE_B if self.write_b.value else 0)
| (BGFX_STATE_WRITE_A if self.write_a.value else 0)
| BGFX_STATE_WRITE_Z
| BGFX_STATE_DEPTH_TEST_LESS
| BGFX_STATE_CULL_CW
| BGFX_STATE_MSAA,
0,
)
bgfx.submit(0, self.main_program, 0, False)
bgfx.frame()
def add_particles(self, position: tuple, radius: float, strength: float):
if self.simulate:
self._init_compute_kernels()
bgfx.setUniform(
self.position_uniform,
as_void_ptr((c_float * 2)(position[0], position[1])),
)
bgfx.setUniform(self.value_uniform,
as_void_ptr((c_float * 1)(strength)))
bgfx.setUniform(self.radius_uniform,
as_void_ptr((c_float * 1)(radius)))
bgfx.dispatch(0, self._add_particles_kernel, self._num_groups_x,
self._num_groups_x, 1)
self._flip_buffer()
def add_velocity(self, position: tuple, velocity: tuple, radius: float):
if self.simulate:
self._init_compute_kernels()
bgfx.setUniform(
self.position_uniform,
as_void_ptr((c_float * 2)(position[0], position[1])),
)
bgfx.setUniform(
self.value_uniform,
as_void_ptr((c_float * 2)(velocity[0], velocity[1])))
bgfx.setUniform(self.radius_uniform,
as_void_ptr((c_float * 1)(radius)))
bgfx.dispatch(0, self._add_velocity_kernel, self._num_groups_x,
self._num_groups_y, 1)
self._flip_velocity_buffer()
def update(self, time_delta: float):
self._init_compute_kernels()
if self.simulate:
bgfx.setUniform(self.dissipation_uniform,
as_void_ptr((c_float * 1)(self.dissipation)))
bgfx.setUniform(self.elapsed_time_uniform,
as_void_ptr((c_float * 1)(time_delta)))
bgfx.setUniform(self.speed_uniform,
as_void_ptr((c_float * 1)(self.speed)))
bgfx.dispatch(
0,
self._advect_particles_kernel,
self._num_groups_x,
self._num_groups_y,
1,
)
self._flip_buffer()
def init(self, platform_data):
bgfx.setPlatformData(platform_data)
bgfx.renderFrame()
bgfx.init(self.init_conf)
bgfx.reset(
self.width, self.height, BGFX_RESET_VSYNC, self.init_conf.resolution.format,
)
bgfx.setDebug(BGFX_DEBUG_TEXT)
bgfx.setViewClear(0, BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH, 0x443355FF, 1.0, 0)
self.vertex_layout = bgfx.VertexLayout()
self.vertex_layout.begin().add(
bgfx.Attrib.Position, 3, bgfx.AttribType.Float
).add(bgfx.Attrib.Color0, 4, bgfx.AttribType.Uint8, True).end()
# Create static vertex buffer
vb_memory = bgfx.copy(
as_void_ptr(cube_vertices), sizeof(PosColorVertex) * num_vertices
)
self.vertex_buffer = bgfx.createVertexBuffer(vb_memory, self.vertex_layout)
self.index_buffers = []
for i in range(0, len(primitives)):
ib_memory = bgfx.copy(as_void_ptr(primitives[i]), primitives[i].nbytes)
self.index_buffers.append(bgfx.createIndexBuffer(ib_memory))
# Create program from shaders.
self.main_program = bgfx.createProgram(
load_shader(
"cubes.VertexShader.vert", ShaderType.VERTEX, root_path=root_path
),
load_shader(
"cubes.FragmentShader.frag", ShaderType.FRAGMENT, root_path=root_path
),
True,
)
ImGuiExtra.create()
def _init_compute_kernels(self):
bgfx.setUniform(
self.particle_size_uniform,
as_void_ptr((c_float * 2)(self._particle_size[0],
self._particle_size[1])),
)
bgfx.setUniform(
self.velocity_size_uniform,
as_void_ptr((c_float * 2)(self._velocity_size[0],
self._velocity_size[1])),
)
bgfx.setBuffer(
TemplateConstants.PARTICLES_IN.value,
self._particles_buffer[self.PARTICLES_IN],
bgfx.Access.Write,
)
bgfx.setBuffer(
TemplateConstants.PARTICLES_OUT.value,
self._particles_buffer[self.PARTICLES_OUT],
bgfx.Access.Write,
)
def add_circle_obstacle(self,
position: tuple,
radius: float,
static=False):
if self.simulate:
self._init_compute_kernels()
bgfx.setUniform(
self.position_uniform,
as_void_ptr((c_float * 2)(position[0], position[1])),
)
bgfx.setUniform(self.radius_uniform,
as_void_ptr((c_float * 1)(radius)))
bgfx.setUniform(self.static_uniform,
as_void_ptr((c_float * 1)(1.0 if static else 0.0)))
bgfx.dispatch(
0,
self._add_circle_obstacle_kernel,
self._num_groups_x,
self._num_groups_y,
1,
)
def add_triangle_obstacle(self,
p1: tuple,
p2: tuple,
p3: tuple,
static=False):
if self.simulate:
self._init_compute_kernels()
bgfx.setUniform(self.p1_uniform,
as_void_ptr((c_float * 2)(p1[0], p1[1])))
bgfx.setUniform(self.p2_uniform,
as_void_ptr((c_float * 2)(p2[0], p2[1])))
bgfx.setUniform(self.p3_uniform,
as_void_ptr((c_float * 2)(p3[0], p3[1])))
bgfx.setUniform(self.static_uniform,
as_void_ptr((c_float * 1)(1.0 if static else 0.0)))
bgfx.dispatch(
0,
self._add_triangle_obstacle_kernel,
self._num_groups_x,
self._num_groups_y,
1,
)
def _init_compute_kernels(self):
bgfx.setUniform(self.size_uniform,
as_void_ptr((c_float * 2)(self._width, self._height)))
bgfx.setBuffer(1, self._velocity_buffer[self.VELOCITY_READ],
bgfx.Access.Read)
bgfx.setBuffer(2, self._velocity_buffer[self.VELOCITY_WRITE],
bgfx.Access.Write)
bgfx.setBuffer(3, self._pressure_buffer[self.PRESSURE_READ],
bgfx.Access.Read)
bgfx.setBuffer(4, self._pressure_buffer[self.PRESSURE_WRITE],
bgfx.Access.Write)
bgfx.setBuffer(5, self._divergence_buffer, bgfx.Access.ReadWrite)
bgfx.setBuffer(6, self._vorticity_buffer, bgfx.Access.ReadWrite)
bgfx.setBuffer(7, self._obstacles_buffer, bgfx.Access.ReadWrite)
def _update_params(self, time_delta: float):
bgfx.setUniform(self.elapsed_time_uniform,
as_void_ptr((c_float * 1)(time_delta)))
bgfx.setUniform(self.speed_uniform,
as_void_ptr((c_float * 1)(self.speed)))
bgfx.setUniform(self.dissipation_uniform,
as_void_ptr((c_float * 1)(self.dissipation)))
bgfx.setUniform(self.vorticity_scale_uniform,
as_void_ptr((c_float * 1)(self.vorticity)))
if self._viscosity > 0.0:
centre_factor = 1.0 / self.viscosity
stencil_factor = 1.0 / (4.0 + centre_factor)
bgfx.setUniform(self.alpha_uniform,
as_void_ptr((c_float * 1)(centre_factor)))
bgfx.setUniform(self.rbeta_uniform,
as_void_ptr((c_float * 1)(stencil_factor)))
def _load_mem(content: bytes) -> bgfx.Memory:
size = len(content)
memory = bgfx.copy(as_void_ptr(content), size)
return memory
def init(self, platform_data):
bgfx.renderFrame()
bgfx.setPlatformData(platform_data)
bgfx.init(self.init_conf)
bgfx.reset(
self.fb_width,
self.fb_height,
BGFX_RESET_VSYNC | BGFX_RESET_HIDPI,
self.init_conf.resolution.format,
)
bgfx.setDebug(BGFX_DEBUG_TEXT)
# bgfx.setViewClear(0, BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH, 0xFFFFFFFF, 1.0, 0)
bgfx.setViewClear(0, BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH, 0x1a0427FF,
1.0, 0)
self.vertex_layout = bgfx.VertexLayout()
self.vertex_layout.begin().add(bgfx.Attrib.Position, 3,
bgfx.AttribType.Float).add(
bgfx.Attrib.TexCoord0, 3,
bgfx.AttribType.Float).end()
self.fluid_simulator = FluidSimulator(self.width // 2,
self.height // 2,
self.vertex_layout)
self.fluid_simulator.vorticity = 1.0
self.fluid_simulator.viscosity = 0.5
self.fluid_simulator.iterations = 50
self.particle_area = SmoothParticlesArea(self.fb_width, self.fb_height,
self.fluid_simulator,
self.vertex_layout)
self.particle_area.dissipation = 0.980
# Create static vertex buffer
vb_memory = bgfx.copy(as_void_ptr(cube_vertices),
sizeof(PosColorVertex) * 4)
self.vertex_buffer = bgfx.createVertexBuffer(vb_memory,
self.vertex_layout)
ib_memory = bgfx.copy(as_void_ptr(cube_indices), cube_indices.nbytes)
self.index_buffer = bgfx.createIndexBuffer(ib_memory)
self.output_texture = bgfx.createTexture2D(
self.fb_width,
self.fb_height,
False,
1,
bgfx.TextureFormat.RGBA8,
BGFX_TEXTURE_COMPUTE_WRITE,
)
self.texture_uniform = bgfx.createUniform("InputTexture",
bgfx.UniformType.Sampler)
self.window_size_uniform = bgfx.createUniform("WindowSize",
bgfx.UniformType.Vec4)
self.velocity_size_uniform = bgfx.createUniform(
"VelocitySize", bgfx.UniformType.Vec4)
self.arrow_tile_size_uniform = bgfx.createUniform(
"ArrowTileSize", bgfx.UniformType.Vec4)
# Create program from shaders.
self.main_program = bgfx.createProgram(
load_shader("demo.VertexShader.vert",
ShaderType.VERTEX,
root_path=root_path),
load_shader(
"demo.FieldFragmentShader.frag",
ShaderType.FRAGMENT,
root_path=root_path,
),
True,
)
self.quiver_program = bgfx.createProgram(
load_shader("demo.VertexShader.vert",
ShaderType.VERTEX,
root_path=root_path),
load_shader(
"demo.QuiverFragmentShader.frag",
ShaderType.FRAGMENT,
root_path=root_path,
),
True,
)
self.cs_program = bgfx.createProgram(
load_shader("demo.ComputeShader.comp",
ShaderType.COMPUTE,
root_path=root_path),
True,
)
ImGuiExtra.create(36.0)
def update(self, dt):
mouse_x, mouse_y, buttons_states = self.get_mouse_state()
ImGuiExtra.begin_frame(int(mouse_x), int(mouse_y), buttons_states, 0,
self.fb_width, self.fb_height)
show_properties_dialog(self.fb_width, self.fb_height, self.hidpi)
self._create_imgui_config_dialog()
ImGuiExtra.end_frame()
at = (c_float * 3)(*[0.0, 0.0, 0.0])
eye = (c_float * 3)(*[0.0, 0.0, 10.0])
up = (c_float * 3)(*[0.0, 1.0, 0.0])
view = look_at(eye, at, up)
projection = proj(11.4, 1, 0.1, 100.0)
bgfx.setViewRect(0, 0, 0, self.fb_width, self.fb_height)
bgfx.setViewTransform(0, as_void_ptr(view), as_void_ptr(projection))
bgfx.setVertexBuffer(0, self.vertex_buffer, 0, 4)
bgfx.setIndexBuffer(self.index_buffer, 0, cube_indices.size)
bgfx.setState(BGFX_STATE_DEFAULT)
bgfx.setImage(0, self.output_texture, 0, bgfx.Access.Write)
self.fluid_simulator.add_circle_obstacle((0.5, 0.5), 40.0)
self.fluid_simulator.update(dt)
self.particle_area.update(dt)
if glfw.get_mouse_button(self.window, glfw.MOUSE_BUTTON_LEFT) == glfw.PRESS\
and not ImGui.GetIO().WantCaptureMouse:
n_mouse_x, n_mouse_y = self._get_normalized_mouse_coords(
mouse_x, mouse_y)
n_old_mouse_x, n_old_mouse_y = self._get_normalized_mouse_coords(
self.old_mouse_x, self.old_mouse_y)
vel_x = n_mouse_x - n_old_mouse_x
vel_y = n_mouse_y - n_old_mouse_y
# if vel_x != 0 and vel_y != 0:
self.fluid_simulator.add_velocity((n_mouse_x, n_mouse_y),
(vel_x * 10, vel_y * 10), 32.0)
self.particle_area.add_particles((n_mouse_x, n_mouse_y),
self.particles_diameter,
self.particles_strength)
self.old_mouse_x = mouse_x
self.old_mouse_y = mouse_y
bgfx.setState(0 | BGFX_STATE_WRITE_RGB | BGFX_STATE_WRITE_A
| BGFX_STATE_BLEND_ALPHA)
bgfx.dispatch(0, self.cs_program, self.fb_width // 16,
self.fb_height // 16)
bgfx.setTexture(0, self.texture_uniform, self.output_texture)
bgfx.submit(0, self.main_program, 0, False)
if self.show_quiver_plot_overlay.value:
bgfx.setBuffer(1, self.fluid_simulator.get_velocity_buffer(),
bgfx.Access.Read)
bgfx.setUniform(
self.window_size_uniform,
as_void_ptr((c_float * 2)(self.fb_width, self.fb_height)),
)
bgfx.setUniform(
self.velocity_size_uniform,
as_void_ptr((c_float * 2)(self.fluid_simulator.width,
self.fluid_simulator.height)),
)
bgfx.setUniform(
self.arrow_tile_size_uniform,
as_void_ptr((c_float * 1)(self.quiver_plot_resolutions[
self.quiver_plot_resolution.value])),
)
bgfx.submit(0, self.quiver_program, 0, False)
bgfx.frame()
def run(self):
glfw_native.glfwCreateWindow.argtypes = [
ctypes.c_int,
ctypes.c_int,
ctypes.c_char_p,
]
glfw_native.glfwCreateWindow.restype = ctypes.POINTER(glfw._GLFWwindow)
glfw_native.glfwMakeContextCurrent.argtypes = [
ctypes.POINTER(glfw._GLFWwindow)
]
glfw_native.glfwWindowShouldClose.argtypes = [
ctypes.POINTER(glfw._GLFWwindow)
]
glfw_native.glfwWindowShouldClose.restype = ctypes.c_int
glfw.init()
glfw.window_hint(glfw.CLIENT_API, glfw.NO_API)
glfw.window_hint(glfw.COCOA_RETINA_FRAMEBUFFER, glfw.TRUE)
self.window = glfw.create_window(self.width, self.height, self.title,
None, None)
self.fb_width, self.fb_height = glfw.get_framebuffer_size(self.window)
self.hidpi = self.fb_width != self.width or self.fb_height != self.height
glfw.set_window_size_callback(self.window, self._handle_window_resize)
handle, display = None, None
if sys.platform == "darwin":
handle = glfw_native.glfwGetCocoaWindow(self.window)
elif sys.platform == "win32":
handle = glfw_native.glfwGetWin32Window(self.window)
elif sys.platform == "linux" and "WAYLAND_DISPLAY" not in os.environ:
handle = glfw_native.glfwGetX11Window(self.window)
display = glfw_native.glfwGetX11Display()
elif sys.platform == "linux" and "WAYLAND_DISPLAY" in os.environ:
handle = glfw_native.glfwGetWaylandWindow(self.window)
display = glfw_native.glfwGetWaylandDisplay()
data = bgfx.PlatformData()
data.ndt = as_void_ptr(display) if display else cppyy.nullptr
data.nwh = as_void_ptr(handle)
data.context = cppyy.nullptr
data.backBuffer = cppyy.nullptr
data.backBufferDS = cppyy.nullptr
self.init(data)
last_time = None
while not glfw.window_should_close(self.window):
glfw.poll_events()
now = time.perf_counter()
if not last_time:
last_time = now
frame_time = now - last_time
last_time = now
self.update(frame_time)
self.shutdown()
glfw.terminate()