Owl — A fast, lightweight, and flexible game engine for the TI-Nspire

[hoffa]

I've been working on a tile engine I named Owl. I had tried it before, but it was generally quite slow and a pain in the butt to use and adapt. I tried it again, but this time a lot more seriously, and it's been progressing nicely. My goal is to make a fast (fast as in TI-Nspire Lua fast), clean, flexible and lightweight tile map engine that anyone can use. The engine currently supports arbitrary-sized maps with scrolling, easy tile, object (anything that can change state during the game), and event (detonate the nuke when Link reads that sign) management. To keep the games responsive, playable and frustration-free, scrolling and movement is blocky, i.e. no smooth scrolling or fancy walking animations (although there will be basic animation management).

As mentioned up there, graphics-heavy TI-Nspire Lua programs (read: programs that use the TI.Image format to draw images a lot) are usually rather slow. But because sprites with a lot of transparent pixels and primitive shapes can be drawn relatively quickly, to tackle the issue of slowness I decided that every tile is defined by an optional background color and and a (hopefully) partially transparent sprite that comes on top of it. That in most cases improves the speed quite a bit. Also I'm working on a map format that will increase the FPS by a good 10%—40%.

All I can give you right now is the current source code, which is kept and updated whenever I commit a change on github (I repeat, it's not ready for public use): https://github.com/Hoffa/Owl

I'll at some point write some sort of documentation and release a public version (when I feel it works and am generally pleased with it, might take some time), but until then you can play around with the code on github if you wish.

EDIT: on hold while I work on the SDL port.

[adriweb]

Awesome !

I'll take a close look

Here's the source code (extracted with the sdk ... )
(and optimized images (replaced \000 with \0

Code: Select All | Copy To Clipboard

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Coyote = class() function Coyote:init(x, y, width, height, options)     options = options or {}     self.gc = platform.gc()     self.x = x     self.y = y     self.width = width     self.height = height     self.tiles = {}     self.controls = options.controls or {up = "up",                                          down = "down",                                          left = "left",                                          right = "right"}     self.player = {}     self.tileSize = options.tileSize or 16     self.scrollThreshold = options.scrollThreshold or 1     self.outOfBoundsColor = options.outOfBoundsColor or {0, 0, 0}     self.tileCount = 0 end function Coyote:loadTile(sprites, color, walkable)     self.tileCount = self.tileCount + 1     self.tiles[self.tileCount] = {}     local tile = self.tiles[self.tileCount]     if type(sprites) == "string" then         tile.sprites = {image.new(sprites)}     elseif type(sprites) == "table" then         tile.sprites = {}         for i = 1, #sprites do             tile.sprites[i] = image.new(sprites[i])         end     end     tile.color = color     tile.walkable = walkable     return self.tileCount end function Coyote:handleMoveKey(key)     local direction = (key == self.controls.up and 1)                     or (key == self.controls.right and 2)                     or (key == self.controls.down and 3)                     or (key == self.controls.left and 4)     local map = self.area.map     local player = self.player     if direction == self.player.direction then         local x = player.x + ((direction == 2 and 1) or (direction == 4 and -1) or 0)         local y = player.y + ((direction == 1 and -1) or (direction == 3 and 1) or 0)         if self.tiles[map.data[y][x]].walkable then             local object = self.area:getObjectAt(x, y)             if not object or self.tiles[object.tile].walkable then                 player.x = x                 player.y = y             end         end         if self:processEvents() then             return         end         map.x = map.x + ((player.x <= map.x + self.scrollThreshold and -1)                          or (player.x + self.scrollThreshold > map.x + self.width and 1)                          or 0)         map.y = map.y + ((player.y <= map.y + self.scrollThreshold and -1)                          or (player.y + self.scrollThreshold > map.y + self.height and 1)                          or 0)     end     self.player.direction = direction end function Coyote:handleEventKey()     self:processEvents(true) end function Coyote:processEvents(keyPressed)     for i = 1, #self.area.events do         local event = self.area.events[i]         if event.x == self.player.x         and event.y == self.player.y         and event.keyPress == (keyPressed or false) then             if not event.direction             or event.direction == self.player.direction then                 event.callback()                 return true             end         end     end end function Coyote:setPlayer(tile, x, y, offsetX, offsetY, direction)     local player = self.player     player.tile = tile     player.x = x     player.y = y     player.offset = {x = offsetX or 0, y = offsetY or 0}     player.direction = direction or 3 end function Coyote:setArea(area)     self.area = area end function Coyote:movePlayer(x, y)     self.player.x = x     self.player.y = y end function Coyote:relativeToAbsolutePosition(x, y)     return ((x - self.area.map.x - 1) * self.tileSize) + self.x,            ((y - self.area.map.y - 1) * self.tileSize) + self.y end function Coyote:drawTileMap()     local x = self.x     local y = self.y     local area = self.area     for i = area.map.y + 1, area.map.y + self.height do         for j = area.map.x + 1, area.map.x + self.width do             if j > 0 and j <= area.map.width and i > 0 and i <= area.map.height             and area.map.data[i][j] > 0 then                 local tile = self.tiles[area.map.data[i][j]]                 if tile.color then                     self.gc:setColorRGB(tile.color[1], tile.color[2], tile.color[3])                     self.gc:fillRect(x, y, self.tileSize, self.tileSize)                 end                 if tile.sprites then                     self.gc:drawImage(tile.sprites[1], x, y)                 end             elseif self.outOfBoundsColor then                 self.gc:setColorRGB(self.outOfBoundsColor[1],                                     self.outOfBoundsColor[2],                                     self.outOfBoundsColor[3])                 self.gc:fillRect(x, y, self.tileSize, self.tileSize)             end             x = x + self.tileSize         end         x = self.x         y = y + self.tileSize     end end function Coyote:drawObjects()     local map = self.area.map     for name, object in pairs(self.area.objects) do         if object.x > map.x and object.x <= map.x + self.width         and object.y > map.y and object.y <= map.y + self.height then             local x, y = self:relativeToAbsolutePosition(object.x, object.y)             self.gc:drawImage(self.tiles[object.tile].sprites[object.currentSprite], x, y)         end     end end function Coyote:drawPlayer()     local x, y = self:relativeToAbsolutePosition(self.player.x, self.player.y)     self.gc:drawImage(self.tiles[self.player.tile].sprites[self.player.direction],                       x + self.player.offset.x, y + self.player.offset.y) end function Coyote:draw()     self:drawTileMap()     self:drawObjects()     self:drawPlayer() end Area = class() function Area:init(super, map, x, y)     self.super = super     self.map = {data = map,                 width = #map[1],                 height = #map,                 x = x or 0,                 y = y or 0}     self.objects = {}     self.events = {} end function Area:newObject(name, tile, x, y)     self.objects[name] = {tile = tile, x = x, y = y, currentSprite = 1} end function Area:newEvent(x, y, direction, keyPress, callback)     table.insert(self.events, {x = x, y = y,                                direction = direction,                                keyPress = keyPress,                                callback = callback}) end function Area:getObjectAt(x, y)     for _, object in pairs(self.objects) do         if object.x == x and object.y == y then             return object         end     end end function Area:moveObject(name, x, y)     self.objects[name].x = x     self.objects[name].y = y end function Area:setObjectSprite(name, spriteNumber)     self.objects[name].currentSprite = spriteNumber end function Area:destroyObject(name)     self.objects[name] = nil end function a1Toa2()     coyote:setArea(a2)     coyote:movePlayer(4, 5) end function a2Toa1()     coyote:setArea(a1)     coyote:movePlayer(12, 2) end function signRead()     a2:destroyObject("blocking_bush") end function on.arrowKey(key)     coyote:handleMoveKey(key)     platform.window:invalidate() end function on.enterKey()     coyote:handleEventKey()     platform.window:invalidate() end local bushS = "\016\0\0\0\016\0\0\0\0\0\0\0 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local flowersS = "\016\0\0\0\016\0\0\0\0\0\0\0 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local fenceS = "\016\0\0\0\016\0\0\0\0\0\0\0 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local stonesS = "\016\0\0\0\016\0\0\0\0\0\0\0 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local signS = "\016\0\0\0\016\0\0\0\0\0\0\0 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local map1 = {{2,2,2,2,2,2,2,2,2,2,2,5,2,2,2},               {2,1,1,1,1,1,1,1,1,4,3,5,3,3,2},               {2,1,1,1,1,3,1,1,1,4,4,5,4,4,2},               {2,3,1,5,5,5,5,5,1,1,1,5,1,1,2},               {2,1,1,5,1,1,1,5,3,1,1,5,1,1,2},               {2,1,1,5,1,1,1,5,1,1,1,5,1,1,2},               {2,1,1,5,1,1,1,5,5,5,5,5,3,1,2},               {2,1,1,5,3,1,1,1,1,1,1,1,1,1,2},               {2,1,1,5,1,1,1,1,3,1,1,1,1,1,2},               {2,4,4,2,4,4,1,1,1,1,1,1,3,1,2},               {2,3,3,5,3,4,1,1,1,1,1,1,1,1,2},               {2,2,2,5,2,2,2,2,2,2,2,2,2,2,2}} local map2 = {{2,2,2,2,2,2},               {2,3,1,1,1,2},               {2,1,1,3,1,2},               {2,1,4,1,4,2},               {2,3,4,1,4,2},               {2,2,2,5,2,2}} local initialized = false function on.paint(gc)     if not initialized then         coyote = Coyote(63, 26, 12, 10)         coyote:loadTile(nil, {72, 152, 72}, true)         local bushT = coyote:loadTile(bushS, {40, 120, 56}, false)         coyote:loadTile(flowersS, {72, 152, 72}, true)         coyote:loadTile(fenceS, nil, false)         coyote:loadTile(stonesS, {160, 224, 168}, true)         local signT = coyote:loadTile(signS, nil, false)         local linkT = coyote:loadTile(linkS, nil, false)         coyote:setPlayer(linkT, 2, 2, 0, -8)         a1 = Area(coyote, map1)         a1:newObject("sign", signT, 10, 6)         a1:newEvent(10, 7, 1, true, signRead)         a1:newEvent(12, 1, nil, false, a1Toa2)         a2 = Area(coyote, map2, -3, -2)         a2:newObject("blocking_bush", bushT, 4, 4)         a2:newEvent(4, 6, nil, false, a2Toa1)         coyote:setArea(a1)         initialized = true     end     coyote:draw()     gc:drawRect(62, 25, 193, 161) end

I'll see how I can optimize it if I find some way to do that...

edit : oh well, your code really looks nice already !

[hoffa]

Thanks a lot!
BTW, is it me or is the formatting messed up?

[DJ Omnimaga]

In June 2012, you might have to change the Coyotes name to Nordiques.

Anyway joking aside, this looks nice. I will definitively have to give this a try when I have time. Will it support full screen or will it always just use a small portion of the screen due to limitations or something else?

[hoffa]

Anyway joking aside, this looks nice. I will definitively have to give this a try when I have time. Will it support full screen or will it always just use a small portion of the screen due to limitations or something else?

Oh no, of course not. It's that small just to show off the scrolling (didn't bother to make a bigger map, maybe I should for the sake of a nicer demo). As I said it'll be a very flexible library, no restrictions.

EDIT: I updated the demo to a full screen one.

[adriweb]

Cool

Also, don't use platform.gc() anymore, it won't work as much (if at all) in future versions.
Here's the same code, but using on.paint's gc :

Code: Select All | Copy To Clipboard

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284

platform.apilevel = '1.0' Coyote = class() function Coyote:init(x, y, width, height, options)     options = options or {}     self.x = x     self.y = y     self.width = width     self.height = height     self.tiles = {}     self.controls = options.controls or {up = "up",                                          down = "down",                                          left = "left",                                          right = "right"}     self.player = {}     self.tileSize = options.tileSize or 16     self.scrollThreshold = options.scrollThreshold or 1     self.outOfBoundsColor = options.outOfBoundsColor or {0, 0, 0}     self.tileCount = 0 end function Coyote:loadTile(sprites, color, walkable)     self.tileCount = self.tileCount + 1     self.tiles[self.tileCount] = {}     local tile = self.tiles[self.tileCount]     if type(sprites) == "string" then         tile.sprites = {image.new(sprites)}     elseif type(sprites) == "table" then         tile.sprites = {}         for i = 1, #sprites do             tile.sprites[i] = image.new(sprites[i])         end     end     tile.color = color     tile.walkable = walkable     return self.tileCount end function Coyote:handleMoveKey(key)     local direction = (key == self.controls.up and 1)                     or (key == self.controls.right and 2)                     or (key == self.controls.down and 3)                     or (key == self.controls.left and 4)     local map = self.area.map     local player = self.player     if direction == self.player.direction then         local x = player.x + ((direction == 2 and 1) or (direction == 4 and -1) or 0)         local y = player.y + ((direction == 1 and -1) or (direction == 3 and 1) or 0)         if self.tiles[map.data[y][x]].walkable then             local object = self.area:getObjectAt(x, y)             if not object or self.tiles[object.tile].walkable then                 player.x = x                 player.y = y             end         end         if self:processEvents() then             return         end         map.x = map.x + ((player.x <= map.x + self.scrollThreshold and -1)                          or (player.x + self.scrollThreshold > map.x + self.width and 1)                          or 0)         map.y = map.y + ((player.y <= map.y + self.scrollThreshold and -1)                          or (player.y + self.scrollThreshold > map.y + self.height and 1)                          or 0)     end     self.player.direction = direction end function Coyote:handleEventKey()     self:processEvents(true) end function Coyote:processEvents(keyPressed)     for i = 1, #self.area.events do         local event = self.area.events[i]         if event.x == self.player.x         and event.y == self.player.y         and event.keyPress == (keyPressed or false) then             if not event.direction             or event.direction == self.player.direction then                 event.callback()                 return true             end         end     end end function Coyote:setPlayer(tile, x, y, offsetX, offsetY, direction)     local player = self.player     player.tile = tile     player.x = x     player.y = y     player.offset = {x = offsetX or 0, y = offsetY or 0}     player.direction = direction or 3 end function Coyote:setArea(area)     self.area = area end function Coyote:movePlayer(x, y)     self.player.x = x     self.player.y = y end function Coyote:relativeToAbsolutePosition(x, y)     return ((x - self.area.map.x - 1) * self.tileSize) + self.x,            ((y - self.area.map.y - 1) * self.tileSize) + self.y end function Coyote:drawTileMap(gc)     local x = self.x     local y = self.y     local area = self.area     for i = area.map.y + 1, area.map.y + self.height do         for j = area.map.x + 1, area.map.x + self.width do             if j > 0 and j <= area.map.width and i > 0 and i <= area.map.height             and area.map.data[i][j] > 0 then                 local tile = self.tiles[area.map.data[i][j]]                 if tile.color then                     gc:setColorRGB(tile.color[1], tile.color[2], tile.color[3])                     gc:fillRect(x, y, self.tileSize, self.tileSize)                 end                 if tile.sprites then                     gc:drawImage(tile.sprites[1], x, y)                 end             elseif self.outOfBoundsColor then                 gc:setColorRGB(self.outOfBoundsColor[1],                                     self.outOfBoundsColor[2],                                     self.outOfBoundsColor[3])                 gc:fillRect(x, y, self.tileSize, self.tileSize)             end             x = x + self.tileSize         end         x = self.x         y = y + self.tileSize     end end function Coyote:drawObjects(gc)     local map = self.area.map     for name, object in pairs(self.area.objects) do         if object.x > map.x and object.x <= map.x + self.width         and object.y > map.y and object.y <= map.y + self.height then             local x, y = self:relativeToAbsolutePosition(object.x, object.y)             gc:drawImage(self.tiles[object.tile].sprites[object.currentSprite], x, y)         end     end end function Coyote:drawPlayer(gc)     local x, y = self:relativeToAbsolutePosition(self.player.x, self.player.y)     gc:drawImage(self.tiles[self.player.tile].sprites[self.player.direction],                       x + self.player.offset.x, y + self.player.offset.y) end function Coyote:draw(gc)     self:drawTileMap(gc)     self:drawObjects(gc)     self:drawPlayer(gc) end Area = class() function Area:init(super, map, x, y)     self.super = super     self.map = {data = map,                 width = #map[1],                 height = #map,                 x = x or 0,                 y = y or 0}     self.objects = {}     self.events = {} end function Area:newObject(name, tile, x, y)     self.objects[name] = {tile = tile, x = x, y = y, currentSprite = 1} end function Area:newEvent(x, y, direction, keyPress, callback)     table.insert(self.events, {x = x, y = y,                                direction = direction,                                keyPress = keyPress,                                callback = callback}) end function Area:getObjectAt(x, y)     for _, object in pairs(self.objects) do         if object.x == x and object.y == y then             return object         end     end end function Area:moveObject(name, x, y)     self.objects[name].x = x     self.objects[name].y = y end function Area:setObjectSprite(name, spriteNumber)     self.objects[name].currentSprite = spriteNumber end function Area:destroyObject(name)     self.objects[name] = nil end function a1Toa2()     coyote:setArea(a2)     coyote:movePlayer(4, 5) end function a2Toa1()     coyote:setArea(a1)     coyote:movePlayer(12, 2) end function signRead()     a2:destroyObject("blocking_bush") end function on.arrowKey(key)     coyote:handleMoveKey(key)     platform.window:invalidate() end function on.enterKey()     coyote:handleEventKey()     platform.window:invalidate() end local bushS = "\016\0\0\0\016\0\0\0\0\0\0\0 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local flowersS = "\016\0\0\0\016\0\0\0\0\0\0\0 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local fenceS = "\016\0\0\0\016\0\0\0\0\0\0\0 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local stonesS = "\016\0\0\0\016\0\0\0\0\0\0\0 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local signS = "\016\0\0\0\016\0\0\0\0\0\0\0 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local linkS = {"\016\0\0\0\024\0\0\0\0\0\0\0 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local map1 = {{2,2,2,2,2,2,2,2,2,2,2,5,2,2,2},               {2,1,1,1,1,1,1,1,1,4,3,5,3,3,2},               {2,1,1,1,1,3,1,1,1,4,4,5,4,4,2},               {2,3,1,5,5,5,5,5,1,1,1,5,1,1,2},               {2,1,1,5,1,1,1,5,3,1,1,5,1,1,2},               {2,1,1,5,1,1,1,5,1,1,1,5,1,1,2},               {2,1,1,5,1,1,1,5,5,5,5,5,3,1,2},               {2,1,1,5,3,1,1,1,1,1,1,1,1,1,2},               {2,1,1,5,1,1,1,1,3,1,1,1,1,1,2},               {2,4,4,2,4,4,1,1,1,1,1,1,3,1,2},               {2,3,3,5,3,4,1,1,1,1,1,1,1,1,2},               {2,2,2,5,2,2,2,2,2,2,2,2,2,2,2}} local map2 = {{2,2,2,2,2,2},               {2,3,1,1,1,2},               {2,1,1,3,1,2},               {2,1,4,1,4,2},               {2,3,4,1,4,2},               {2,2,2,5,2,2}} local initialized = false function on.paint(gc)     if not initialized then         coyote = Coyote(63, 26, 12, 10)         coyote:loadTile(nil, {72, 152, 72}, true)         local bushT = coyote:loadTile(bushS, {40, 120, 56}, false)         coyote:loadTile(flowersS, {72, 152, 72}, true)         coyote:loadTile(fenceS, nil, false)         coyote:loadTile(stonesS, {160, 224, 168}, true)         local signT = coyote:loadTile(signS, nil, false)         local linkT = coyote:loadTile(linkS, nil, false)         coyote:setPlayer(linkT, 2, 2, 0, -8)         a1 = Area(coyote, map1)         a1:newObject("sign", signT, 10, 6)         a1:newEvent(10, 7, 1, true, signRead)         a1:newEvent(12, 1, nil, false, a1Toa2)         a2 = Area(coyote, map2, -3, -2)         a2:newObject("blocking_bush", bushT, 4, 4)         a2:newEvent(4, 6, nil, false, a2Toa1)         coyote:setArea(a1)         initialized = true     end     coyote:draw(gc)     gc:drawRect(62, 25, 193, 161) end

[ExtendeD]

Good idea hoffa

[yunhua98]

Wow.  I will definitely use this at some point. 

[cyanophycean314]

I'm getting a 404 when trying to access the source. 

Are those versions of source posted by adriweb the full source and most up to date?

Nice job though 

[apcalc]

Looks nice!  Excellent work!

[adriweb]

It looks like his project is now named "Owl" :

https://github.com/Hoffa/Owl

[hoffa]

It looks like his project is now named "Owl" :

https://github.com/Hoffa/Owl

It indeed is, haven't had the time to edit the thread, I'm working rather silently so I can get the most important things up. It'll also have a website and I'll use LuaDoc for the documentation.
Screenshot:

Spoiler for Hidden:

[DJ Omnimaga]

Looks quite nice so far. By the way although smooth scrolling cannot be implemented, have you tried 8 pixel scrolling or even 4 pixel scrolling?

[hoffa]

Looks quite nice so far. By the way although smooth scrolling cannot be implemented, have you tried 8 pixel scrolling or even 4 pixel scrolling?

No but I have tried some sort of smooth scrolling in the past. Way too slow for what it gives back, not worth the pain of implementing it. Well, at least not a this point, maybe if Lua gets a bit faster in the future, then why not.

[cyanophycean314]

Okay. Thanks!