demoii8_9.cpp

3D游戏编程大师技巧第八章的源代码

return(1);
} // end Game_Shutdown

//////////////////////////////////////////////////////////

int Game_Main(void *parms)
{
// this is the workhorse of your game it will be called
// continuously in real-time this is like main() in C
// all the calls for you game go here!

static MATRIX4X4 mrot;   // general rotation matrix

// these are used to create a circling camera
static float view_angle = 0; 
static float camera_distance = 6000;
static VECTOR4D pos = {0,0,0,0};
char work_string[256]; // temp string
int index; // looping var

// start the timing clock
Start_Clock();

// clear the drawing surface 
DDraw_Fill_Surface(lpddsback, 0);

// read keyboard and other devices here
DInput_Read_Keyboard();

// game logic here...

// reset the render list
Reset_RENDERLIST4DV1(&rend_list);

// allow user to move camera

// forward/backward
if (keyboard_state[DIK_UP])
   {
   // move forward
   cam.pos.x += 5*Fast_Sin(cam.dir.y);
   cam.pos.z += 5*Fast_Cos(cam.dir.y);
   } // end if

if (keyboard_state[DIK_DOWN])
   {
   // move backward
   cam.pos.x -= 5*Fast_Sin(cam.dir.y);
   cam.pos.z -= 5*Fast_Cos(cam.dir.y);
   } // end if

// rotate object
if (keyboard_state[DIK_RIGHT])
   {
   obj_player.dir.y+=2;
   } // end if

if (keyboard_state[DIK_LEFT])
   {
   obj_player.dir.y-=6;
   } // end if

if (obj_player.dir.y > 360)
    obj_player.dir.y-=360;

if (obj_player.dir.y < 0)
    obj_player.dir.y+=360;

// ambient rotation
obj_player.dir.y+=2;


// scale object
if (keyboard_state[DIK_PGUP])
   {
VECTOR4D_INITXYZ(&vscale,1.1,1.1,1.1);  
   Scale_OBJECT4DV1(&obj_player, &vscale);
   } // end if

if (keyboard_state[DIK_PGDN])
   {
   VECTOR4D_INITXYZ(&vscale,.9,.9,.9);
   Scale_OBJECT4DV1(&obj_player, &vscale);
   } // end if

// modes and lights

// wireframe mode
if (keyboard_state[DIK_W])
   {
   // toggle wireframe mode
   wireframe_mode = -wireframe_mode;
   Wait_Clock(100); // wait, so keyboard doesn't bounce
   } // end if

// backface removal
if (keyboard_state[DIK_B])
   {
   // toggle backface removal
   backface_mode = -backface_mode;
   Wait_Clock(100); // wait, so keyboard doesn't bounce
   } // end if

// lighting
if (keyboard_state[DIK_L])
   {
   // toggle lighting engine completely
   lighting_mode = -lighting_mode;
   Wait_Clock(100); // wait, so keyboard doesn't bounce
   } // end if

// toggle ambient light
if (keyboard_state[DIK_A])
   {
   // toggle ambient light
   if (lights[AMBIENT_LIGHT_INDEX].state == LIGHTV1_STATE_ON)
      lights[AMBIENT_LIGHT_INDEX].state = LIGHTV1_STATE_OFF;
   else
      lights[AMBIENT_LIGHT_INDEX].state = LIGHTV1_STATE_ON;

   Wait_Clock(100); // wait, so keyboard doesn't bounce
   } // end if

// toggle infinite light
if (keyboard_state[DIK_I])
   {
   // toggle ambient light
   if (lights[INFINITE_LIGHT_INDEX].state == LIGHTV1_STATE_ON)
      lights[INFINITE_LIGHT_INDEX].state = LIGHTV1_STATE_OFF;
   else
      lights[INFINITE_LIGHT_INDEX].state = LIGHTV1_STATE_ON;

   Wait_Clock(100); // wait, so keyboard doesn't bounce
   } // end if

// toggle point light
if (keyboard_state[DIK_P])
   {
   // toggle point light
   if (lights[POINT_LIGHT_INDEX].state == LIGHTV1_STATE_ON)
      lights[POINT_LIGHT_INDEX].state = LIGHTV1_STATE_OFF;
   else
      lights[POINT_LIGHT_INDEX].state = LIGHTV1_STATE_ON;

   Wait_Clock(100); // wait, so keyboard doesn't bounce
   } // end if


// toggle spot light
if (keyboard_state[DIK_S])
   {
   // toggle spot light
   if (lights[SPOT_LIGHT_INDEX].state == LIGHTV1_STATE_ON)
      lights[SPOT_LIGHT_INDEX].state = LIGHTV1_STATE_OFF;
   else
      lights[SPOT_LIGHT_INDEX].state = LIGHTV1_STATE_ON;

   Wait_Clock(100); // wait, so keyboard doesn't bounce
   } // end if


// help menu
if (keyboard_state[DIK_H])
   {
   // toggle help menu 
   help_mode = -help_mode;
   Wait_Clock(100); // wait, so keyboard doesn't bounce
   } // end if

// z-sorting
if (keyboard_state[DIK_Z])
   {
   // toggle z sorting
   zsort_mode = -zsort_mode;
   Wait_Clock(100); // wait, so keyboard doesn't bounce
   } // end if


static float plight_ang = 0, slight_ang = 0; // angles for light motion

// move point light source in ellipse around game world
lights[POINT_LIGHT_INDEX].pos.x = 300*Fast_Cos(plight_ang);
lights[POINT_LIGHT_INDEX].pos.y = 200;
lights[POINT_LIGHT_INDEX].pos.z = 300*Fast_Sin(plight_ang);

if ((plight_ang+=3) > 360)
    plight_ang = 0;

// move spot light source in ellipse around game world
lights[SPOT_LIGHT_INDEX].pos.x = 200*Fast_Cos(slight_ang);
lights[SPOT_LIGHT_INDEX].pos.y = 200;
lights[SPOT_LIGHT_INDEX].pos.z = 200*Fast_Sin(slight_ang);

if ((slight_ang-=5) < 0)
    slight_ang = 360;


/////////////////////////////////////////

// generate camera matrix
Build_CAM4DV1_Matrix_Euler(&cam, CAM_ROT_SEQ_ZYX);

// insert the player into the world
// reset the object (this only matters for backface and object removal)
Reset_OBJECT4DV1(&obj_player);

// generate rotation matrix around y axis
Build_XYZ_Rotation_MATRIX4X4(0, obj_player.dir.y, 0, &mrot);

// rotate the local coords of the object
Transform_OBJECT4DV1(&obj_player, &mrot, TRANSFORM_LOCAL_TO_TRANS,1);

// perform world transform
Model_To_World_OBJECT4DV1(&obj_player, TRANSFORM_TRANS_ONLY);


           // perform lighting
           if (lighting_mode==1)
              Light_OBJECT4DV1_World16(&obj_player, &cam, lights, 4);   

           // insert the object into render list
           Insert_OBJECT4DV1_RENDERLIST4DV12(&rend_list, &obj_player,0,lighting_mode);

// insert the object into render list
//Insert_OBJECT4DV1_RENDERLIST4DV12(&rend_list, &obj_player,0, 0);

//////////////////////////////////////

// remove backfaces
if (backface_mode==1)
   Remove_Backfaces_RENDERLIST4DV1(&rend_list, &cam);

// light scene all at once 
//if (lighting_mode==1)
//   Light_RENDERLIST4DV1_World16(&rend_list, &cam, lights, 4);

// apply world to camera transform
World_To_Camera_RENDERLIST4DV1(&rend_list, &cam);

// sort the polygon list (hurry up!)
if (zsort_mode == 1)
   Sort_RENDERLIST4DV1(&rend_list,  SORT_POLYLIST_AVGZ);

// apply camera to perspective transformation
Camera_To_Perspective_RENDERLIST4DV1(&rend_list, &cam);

// apply screen transform
Perspective_To_Screen_RENDERLIST4DV1(&rend_list, &cam);

sprintf(work_string,"pos:[%f, %f, %f] heading:[%f] elev:[%f], polys[%d]", 
        cam.pos.x, cam.pos.y, cam.pos.z, cam.dir.y, cam.dir.x, debug_polys_rendered_per_frame); 

Draw_Text_GDI(work_string, 0, WINDOW_HEIGHT-20, RGB(0,255,0), lpddsback);

sprintf(work_string,"Lighting [%s]: Ambient=%d, Infinite=%d, Point=%d, Spot=%d | Zsort [%s], BckFceRM [%s]", 
                                                                                 ((lighting_mode == 1) ? "ON" : "OFF"),
                                                                                 lights[AMBIENT_LIGHT_INDEX].state,
                                                                                 lights[INFINITE_LIGHT_INDEX].state, 
                                                                                 lights[POINT_LIGHT_INDEX].state,
                                                                                 lights[SPOT_LIGHT_INDEX].state,
                                                                                 ((zsort_mode == 1) ? "ON" : "OFF"),
                                                                                 ((backface_mode == 1) ? "ON" : "OFF"));

Draw_Text_GDI(work_string, 0, WINDOW_HEIGHT-34, RGB(0,255,0), lpddsback);

// draw instructions
Draw_Text_GDI("Press ESC to exit. Press <H> for Help.", 0, 0, RGB(0,255,0), lpddsback);

// should we display help
int text_y = 16;
if (help_mode==1)
    {
    // draw help menu
    Draw_Text_GDI("<A>..............Toggle ambient light source.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<I>..............Toggle infinite light source.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<P>..............Toggle point light source.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<S>..............Toggle spot light source.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<W>..............Toggle wire frame/solid mode.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<B>..............Toggle backface removal.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<RIGHT ARROW>....Rotate object right.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<LEFT ARROW>.....Rotate object left.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<UP ARROW>.......Move camera forward.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<DOWN ARROW>.....Move camera backward.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<PG UP>..........Scale object down", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<PG DWN>.........Scale object down", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<SPACE BAR>......Turbo.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<H>..............Toggle Help.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<ESC>............Exit demo.", 0, text_y+=12, RGB(255,255,255), lpddsback);

    } // end help

// lock the back buffer
DDraw_Lock_Back_Surface();

// reset number of polys rendered
debug_polys_rendered_per_frame = 0;

// render the object
if (wireframe_mode  == 1)
   Draw_RENDERLIST4DV1_Wire16(&rend_list, back_buffer, back_lpitch);
else
   Draw_RENDERLIST4DV1_Solid16(&rend_list, back_buffer, back_lpitch);

// unlock the back buffer
DDraw_Unlock_Back_Surface();

// flip the surfaces
DDraw_Flip();

// sync to 30ish fps
Wait_Clock(30);

// check of user is trying to exit
if (KEY_DOWN(VK_ESCAPE) || keyboard_state[DIK_ESCAPE])
    {
    PostMessage(main_window_handle, WM_DESTROY,0,0);
    } // end if

// return success
return(1);
 
} // end Game_Main

//////////////////////////////////////////////////////////