modules/RenderEngine/src/mesh.lua

   1 local Mesh = Dragonblocks.create_class()
   2
   3 Mesh.EFFECT_GROW = 1
   4 Mesh.EFFECT_FLYIN = 2
   5 Mesh.EFFECT_ROTATE = 3
   6 Mesh.CUBE = RenderEngine:run("cube")
   7 Mesh.list = {}
   8
   9 function Mesh:set_size(size)
  10         self.size = size
  11 end
  12
  13 function Mesh:set_pos(pos)
  14         self.pos = pos
  15 end
  16
  17 function Mesh:set_texture(texture)
  18         self.texture = texture
  19 end
  20
  21 function Mesh:set_effect(effect, after)
  22         self.effect = effect
  23         self.effect_lasts =
  24                 (effect == Mesh.EFFECT_GROW) and RenderEngine.mesh_effect_grow_time
  25                 or
  26                 (effect == Mesh.EFFECT_FLYIN) and RenderEngine.mesh_effect_flyin_time
  27         self.after_effect = after
  28 end
  29
  30 function Mesh:add_to_scene()
  31         if self.effect then
  32                 self.created = glfw.get_time()
  33         end
  34         table.insert(Mesh.list, self)
  35 end
  36
  37 function Mesh:remove_from_scene()
  38         local i = table.indexof(Mesh.list, self)
  39         if i then
  40                 table.remove(Mesh.list, i)
  41         end
  42 end
  43
  44 function Mesh:make_cube()
  45         self:apply_vertices(Mesh.CUBE)
  46 end
  47
  48 function Mesh:apply_vertices(vertices)
  49         self.vao = gl.gen_vertex_arrays(1)
  50         self.vbo = gl.gen_buffers(1)
  51
  52         gl.bind_vertex_array(self.vao)
  53
  54         gl.bind_buffer("array", self.vbo)
  55         gl.buffer_data("array", gl.pack("float", vertices), "static draw")
  56
  57         local fsize = gl.sizeof("float")
  58
  59         local stride = 5 * fsize
  60
  61         gl.vertex_attrib_pointer(0, 3, "float", false, stride, 0)
  62         gl.enable_vertex_attrib_array(0)
  63         gl.vertex_attrib_pointer(1, 2, "float", false, stride, 3 * fsize)
  64         gl.enable_vertex_attrib_array(1)
  65
  66         gl.unbind_buffer("array")
  67         gl.unbind_vertex_array()
  68
  69         return vao
  70 end
  71
  72 function Mesh:render(dtime)
  73         local pos, size = self.pos, self.size
  74
  75         if self.effect then
  76                 if self.effect_lasts then
  77                         self.effect_lasts = self.effect_lasts - dtime
  78                         if self.effect_lasts < 0 then
  79                                 if self.after_effect then
  80                                         self:after_effect()
  81                                 end
  82                                 self.effect = nil
  83                                 self.effect_lasts = nil
  84                                 self.after_effect = nil
  85                                 goto draw
  86                         end
  87                 end
  88                 if self.effect == Mesh.EFFECT_GROW then
  89                         size = size * math.pow(1 - self.effect_lasts / RenderEngine.mesh_effect_grow_time, 1)
  90                 elseif self.effect == Mesh.EFFECT_FLYIN then
  91                         pos = pos - glm.vec3(0, RenderEngine.mesh_effect_flyin_offset * self.effect_lasts / RenderEngine.mesh_effect_flyin_time, 0)
  92                 end
  93         end
  94
  95         ::draw::
  96
  97         local model_matrix = 1
  98                 * glm.translate(pos)
  99                 * glm.scale(size)
 100
 101         gl.uniform_matrix4f(gl.get_uniform_location(RenderEngine.shaders, "model"), true, model_matrix)
 102         gl.active_texture(0)
 103         gl.bind_texture("2d", self.texture)
 104         gl.bind_vertex_array(self.vao)
 105         gl.draw_arrays("triangles", 0, 36)
 106         gl.unbind_vertex_array()
 107         gl.unbind_texture("2d")
 108 end
 109
 110 return Mesh