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Posted: **Fri May 19, 2006 6:57 am**

Hi dudes..you're master..so i hope u can help me..

i have to do something like this..

i've written a program in C language..
now..if i press X i would to run the code of a .lua file that i have..how could i do it?

Posted: **Wed May 24, 2006 12:06 am**

So... you have a C program that runs on the PS2 and you have a Lua environment set up? Have you initialized Lua? Using Lua on the PS2 is pretty straitforward, but there are some changes to get Lua to compile. If you need I can post a diff from Lua 5.1 to get it to work on the PS2.

Assuming you have Lua compiling and linking with your C program, you need to initialize it like this:

Code: Select all

// Create lua VM
lua_State *g_luaVM = lua_open&#40;&#41;;
// Open standard libs &#40;optional&#41;
luaL_openlibs&#40;g_luaVM&#41;;

To load a file simply:

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if &#40;luaL_dofile&#40;g_luaVM, "main.lua"&#41;&#41;
&#123;
  printf&#40;"Executing main.lua failed.\n"&#41;;
&#125;

I usually load a file that looks something like this:

Code: Select all

objRot = createVector&#40;&#41;
objPos = createVector&#40;&#41;

localWorld = createMatrix&#40;&#41;
worldView = createMatrix&#40;&#41;
localScreen = createMatrix&#40;&#41;
viewScreen = createMatrix&#40;&#41;

pointCount = 36
cubePoints = createPointArray&#40;pointCount&#41;
cubePoints&#91;0&#93;  =  0 cubePoints&#91;1&#93;  =  1 cubePoints&#91;2&#93;  =  2
-- setup point array code removed...
cubePoints&#91;33&#93; = 21 cubePoints&#91;34&#93; = 22 cubePoints&#91;35&#93; = 23

vertexCount = 24
vertices = createVertexArray&#40;vertexCount&#41;
vertices&#91;0*4&#93; = 10 vertices&#91;0*4+1&#93; = 10 vertices&#91;0*4+2&#93; = 10 vertices&#91;0*4+3&#93;=1
-- setup vertex array code removed...
vertices&#91;23*4&#93;= 10 vertices&#91;23*4+1&#93;=-10 vertices&#91;23*4+2&#93;=-10 vertices&#91;23*4+3&#93;=1

colours = createVertexArray&#40;vertexCount&#41;
-- Setup Color area code removed...

function update&#40;&#41;
  -- update object position based on user input
  objRot&#91;0&#93; = objRot&#91;0&#93; + &#40;normJoyAxis&#40;pad&#91;1&#93;.RJOY_V&#41; / 20&#41;
  objRot&#91;1&#93; = objRot&#91;1&#93; + &#40;normJoyAxis&#40;pad&#91;1&#93;.RJOY_H&#41; / 20&#41;
  objPos&#91;0&#93; = objPos&#91;0&#93; + normJoyAxis&#40;pad&#91;1&#93;.LJOY_H&#41;
  objPos&#91;1&#93; = objPos&#91;1&#93; - normJoyAxis&#40;pad&#91;1&#93;.LJOY_V&#41; 

  -- setup matrices for rendering
  create_local_world&#40;localWorld, objPos, objRot&#41;
  create_world_view&#40;worldView, camPos, camRot&#41;
  create_local_screen&#40;localScreen, localWorld, worldView, viewScreen&#41;

  -- queue an object for rendering
  queue_render_buffers&#40;localScreen, vertexCount, vertices, colours, pointCount, cubePoints&#41;

  vsync&#40;&#41;
  render_queue&#40;&#41;
end

And then in my main() loop I do:

Code: Select all

executeLuaFunc&#40;"update"&#41;;

With that being defined as:

Code: Select all

void executeLuaFunc&#40;const char *fname&#41;
&#123;
  lua_getglobal&#40;g_luaVM, fname&#41;;
  if &#40;lua_isfunction&#40;g_luaVM, -1&#41;&#41;
  &#123;
    lua_pcall&#40;g_luaVM, 0, 0, 0&#41;;
  &#125; else &#123;
    lua_pop&#40;g_luaVM, 1&#41;;
  &#125;
&#125;

To get input from the pad I used the simple rpc/pad example from ps2sdk. I just use the pad state to update some variables in Lua.

The lua functions that I call are based on ps2sdk and can perform some simple rendering and setup. If you need more help, please post.

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lua strings in my c program..

lua strings in my c program..