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.list = {}
   7
   8 function Mesh:set_size(size)
   9         self.size = size
  10 end
  11
  12 function Mesh:set_pos(pos)
  13         self.pos = pos
  14 end
  15
  16 function Mesh:set_texture(texture)
  17         self.textures = {texture}
  18 end
  19
  20 function Mesh:set_effect(effect, after)
  21         self.effect = effect
  22         self.effect_lasts =
  23                 (effect == Mesh.EFFECT_GROW) and RenderEngine.mesh_effect_grow_time
  24                 or
  25                 (effect == Mesh.EFFECT_FLYIN) and RenderEngine.mesh_effect_flyin_time
  26         self.after_effect = after
  27 end
  28
  29 function Mesh:add_to_scene()
  30         if self.effect then
  31                 self.created = glfw.get_time()
  32         end
  33         table.insert(Mesh.list, self)
  34 end
  35
  36 function Mesh:remove_from_scene()
  37         local i = table.indexof(Mesh.list, self)
  38         if i then
  39                 table.remove(Mesh.list, i)
  40         end
  41 end
  42
  43 function Mesh:apply_vertices(vertices)
  44         self.vertex_blob_count = #vertices / 5 / self.vertex_blob_size
  45
  46         self.vao = gl.gen_vertex_arrays(1)
  47         self.vbo = gl.gen_buffers(1)
  48
  49         gl.bind_vertex_array(self.vao)
  50
  51         gl.bind_buffer("array", self.vbo)
  52         gl.buffer_data("array", gl.pack("float", vertices), "static draw")
  53
  54         local fsize = gl.sizeof("float")
  55
  56         local stride = 5 * fsize
  57
  58         gl.vertex_attrib_pointer(0, 3, "float", false, stride, 0)
  59         gl.enable_vertex_attrib_array(0)
  60         gl.vertex_attrib_pointer(1, 2, "float", false, stride, 3 * fsize)
  61         gl.enable_vertex_attrib_array(1)
  62
  63         gl.unbind_buffer("array")
  64         gl.unbind_vertex_array()
  65
  66         return vao
  67 end
  68
  69 function Mesh:render(dtime)
  70         local pos, size, rotation = self.pos, self.size, 0
  71
  72         if self.effect then
  73                 if self.effect_lasts then
  74                         self.effect_lasts = self.effect_lasts - dtime
  75                         if self.effect_lasts < 0 then
  76                                 if self.after_effect then
  77                                         self:after_effect()
  78                                 end
  79                                 self.effect = nil
  80                                 self.effect_lasts = nil
  81                                 self.after_effect = nil
  82                                 goto draw
  83                         end
  84                 end
  85                 if self.effect == Mesh.EFFECT_GROW then
  86                         size = size * math.pow(1 - self.effect_lasts / RenderEngine.mesh_effect_grow_time, 1)
  87                 elseif self.effect == Mesh.EFFECT_FLYIN then
  88                         pos = pos - glm.vec3(0, RenderEngine.mesh_effect_flyin_offset * self.effect_lasts / RenderEngine.mesh_effect_flyin_time, 0)
  89                 elseif self.effect == Mesh.EFFECT_ROTATE then
  90                         rotation = glfw.get_time() * RenderEngine.mesh_effect_rotate_speed * math.pi * 2
  91                 end
  92         end
  93
  94         ::draw::
  95
  96         local model_matrix = 1
  97                 * glm.translate(pos)
  98                 * glm.rotate(rotation, glm.vec3(0, 1, 0))
  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_vertex_array(self.vao)
 104         for i = 1, self.vertex_blob_count do
 105                 gl.bind_texture("2d", self.textures[i])
 106                 gl.draw_arrays("triangles", (i - 1) * self.vertex_blob_size, self.vertex_blob_size)
 107         end
 108         gl.unbind_vertex_array()
 109         gl.unbind_texture("2d")
 110 end
 111
 112 return Mesh