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game_mouse_flight.lua
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game_mouse_flight.lua
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-- Mouse flight
hg = require("harfang")
hg.InputInit()
hg.WindowSystemInit()
res_x, res_y = 1280, 720
win = hg.RenderInit('Harfang - Mouse Flight', res_x, res_y, hg.RF_VSync | hg.RF_MSAA8X)
res = hg.PipelineResources()
pipeline = hg.CreateForwardPipeline()
keyboard = hg.Keyboard()
mouse = hg.Mouse()
-- access to compiled resources
hg.AddAssetsFolder('resources_compiled')
-- 2D drawing helpers
vtx_layout = hg.VertexLayoutPosFloatColorFloat()
draw2D_program = hg.LoadProgramFromAssets('shaders/pos_rgb')
draw2D_render_state = hg.ComputeRenderState(hg.BM_Alpha, hg.DT_Less, hg.FC_Disabled)
function draw_circle(view_id, center, radius, color)
segment_count = 32
step = 2 * math.pi / segment_count
p0 = hg.Vec3(center.x + radius, center.y, 0)
p1 = hg.Vec3(0, 0, 0)
vtx = hg.Vertices(vtx_layout, segment_count * 2 + 2)
for i = 0, segment_count do
p1.x = radius * math.cos(i * step) + center.x
p1.y = radius * math.sin(i * step) + center.y
vtx:Begin(2 * i):SetPos(p0):SetColor0(color):End()
vtx:Begin(2 * i + 1):SetPos(p1):SetColor0(color):End()
p0.x, p0.y = p1.x, p1.y
end
hg.DrawLines(view_id, vtx, draw2D_program, draw2D_render_state)
end
-- gameplay settings
setting_camera_chase_offset = hg.Vec3(0, 0.2, 0)
setting_camera_chase_distance = 1
setting_plane_speed = 0.05
setting_plane_mouse_sensitivity = 0.5
-- setup game world
scene = hg.Scene()
hg.LoadSceneFromAssets('playground/playground.scn', scene, res, hg.GetForwardPipelineInfo())
plane_node = hg.CreateInstanceFromAssets(scene, hg.TranslationMat4(hg.Vec3(0, 4, 0)), 'paper_plane/paper_plane.scn', res, hg.GetForwardPipelineInfo())
camera_node = hg.CreateCamera(scene, hg.TranslationMat4(hg.Vec3(0, 4, -5)), 0.01, 1000)
scene:SetCurrentCamera(camera_node)
function update_plane(mouse_x_normd, mouse_y_normd)
plane_transform = plane_node:GetTransform()
plane_pos = plane_transform:GetPos()
plane_pos = plane_pos + hg.Normalize(hg.GetZ(plane_transform:GetWorld())) * setting_plane_speed
plane_pos.y = hg.Clamp(plane_pos.y, 0.1, 50) -- floor/ceiling
plane_rot = plane_transform:GetRot()
next_plane_rot = hg.Vec3(plane_rot) -- make a copy of the plane rotation
next_plane_rot.x = hg.Clamp(next_plane_rot.x + mouse_y_normd * -0.03, -0.75, 0.75)
next_plane_rot.y = next_plane_rot.y + mouse_x_normd * 0.03
next_plane_rot.z = hg.Clamp(mouse_x_normd * -0.75, -1.2, 1.2)
plane_rot = plane_rot + (next_plane_rot - plane_rot) * setting_plane_mouse_sensitivity
plane_transform:SetPos(plane_pos)
plane_transform:SetRot(plane_rot)
end
function update_chase_camera(target_pos)
camera_transform = camera_node:GetTransform()
camera_to_target = hg.Normalize(target_pos - camera_transform:GetPos())
camera_transform:SetPos(target_pos - camera_to_target * setting_camera_chase_distance) -- camera is 'distance' away from its target
camera_transform:SetRot(hg.ToEuler(hg.Mat3LookAt(camera_to_target)))
end
-- game loop
while not keyboard:Down(hg.K_Escape) and hg.IsWindowOpen(win) do
dt = hg.TickClock() -- tick clock, retrieve elapsed clock since last call
-- update mouse/keyboard devices
keyboard:Update()
mouse:Update()
-- compute ratio corrected normalized mouse position
mouse_x, mouse_y = mouse:X(), mouse:Y()
aspect_ratio = hg.ComputeAspectRatioX(res_x, res_y)
mouse_x_normd, mouse_y_normd = (mouse_x / res_x - 0.5) * aspect_ratio.x, (mouse_y / res_y - 0.5) * aspect_ratio.y
-- update gameplay elements (plane & camera)
update_plane(mouse_x_normd, mouse_y_normd)
update_chase_camera(plane_node:GetTransform():GetWorld() * setting_camera_chase_offset)
-- update scene and submit it to render pipeline
scene:Update(dt)
view_id = 0
view_id, passes_id = hg.SubmitSceneToPipeline(view_id, scene, hg.IntRect(0, 0, res_x, res_y), true, pipeline, res)
-- draw 2D GUI
hg.SetView2D(view_id, 0, 0, res_x, res_y, -1, 1, hg.CF_Depth, hg.Color.Black, 1, 0, true)
draw_circle(view_id, hg.Vec3(mouse_x, mouse_y, 0), 20, hg.Color.White) -- display mouse cursor
-- end of frame
hg.Frame()
hg.UpdateWindow(win)
end
hg.RenderShutdown()
hg.DestroyWindow(win)
hg.WindowSystemShutdown()
hg.InputShutdown()