demoii8_4_8b.cpp

3D游戏编程大师技巧第八章的源代码

// load the master tower object
VECTOR4D_INITXYZ(&vscale,1.0, 2.0, 1.0);
Load_OBJECT4DV1_PLG(&obj_tower, "tower1_8b.plg",&vscale, &vpos, &vrot);

// load the master ground marker
VECTOR4D_INITXYZ(&vscale,3.0,3.0,3.0);
Load_OBJECT4DV1_PLG(&obj_marker, "marker1_8b.plg",&vscale, &vpos, &vrot);

// position the tanks
for (index = 0; index < NUM_TANKS; index++)
    {
    // randomly position the tanks
    tanks[index].x = RAND_RANGE(-UNIVERSE_RADIUS, UNIVERSE_RADIUS);
    tanks[index].y = 0; // obj_tank.max_radius;
    tanks[index].z = RAND_RANGE(-UNIVERSE_RADIUS, UNIVERSE_RADIUS);
    tanks[index].w = RAND_RANGE(0,360);
    } // end for

// position the towers
for (index = 0; index < NUM_TOWERS; index++)
    {
    // randomly position the tower
    towers[index].x = RAND_RANGE(-UNIVERSE_RADIUS, UNIVERSE_RADIUS);
    towers[index].y = 0; // obj_tower.max_radius;
    towers[index].z = RAND_RANGE(-UNIVERSE_RADIUS, UNIVERSE_RADIUS);
    } // end for

// set up lights

// return success
return(1);

} // end Game_Init

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

int Game_Shutdown(void *parms)
{
// this function is where you shutdown your game and
// release all resources that you allocated

// shut everything down

// release all your resources created for the game here....

// now directsound
DSound_Stop_All_Sounds();
DSound_Delete_All_Sounds();
DSound_Shutdown();

// directmusic
DMusic_Delete_All_MIDI();
DMusic_Shutdown();

// shut down directinput
DInput_Release_Keyboard();

// shutdown directinput
DInput_Shutdown();

// shutdown directdraw last
DDraw_Shutdown();

Close_Error_File();

// return success
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};
static float tank_speed;
static float turning = 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);

// draw the sky
Draw_Rectangle(0,0, WINDOW_WIDTH-1, WINDOW_HEIGHT/2, 166, lpddsback);
//Draw_Rectangle(0,0, WINDOW_WIDTH-1, WINDOW_HEIGHT/2, RGB16Bit(0,140,192), lpddsback);

// draw the ground
Draw_Rectangle(0,WINDOW_HEIGHT/2, WINDOW_WIDTH-1, WINDOW_HEIGHT-1, 28, lpddsback);
//Draw_Rectangle(0,WINDOW_HEIGHT/2, WINDOW_WIDTH-1, WINDOW_HEIGHT-1, RGB16Bit(103,62,3), lpddsback);

// 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

// turbo
if (keyboard_state[DIK_SPACE])
    tank_speed = 5*TANK_SPEED;
else
    tank_speed = TANK_SPEED;

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

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

// rotate
if (keyboard_state[DIK_RIGHT])
   {
   cam.dir.y+=3;
   
   // add a little turn to object
   if ((turning+=2) > 15)
      turning=15;
   } // end if

if (keyboard_state[DIK_LEFT])
   {
   cam.dir.y-=3;

   // add a little turn to object
   if ((turning-=2) < -15)
      turning=-15;

   } // end if
else // center heading again
   {
   if (turning > 0)
       turning-=1;
   else
   if (turning < 0)
       turning+=1;

   } // end else

// 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);

// set position of tank
obj_player.world_pos.x = cam.pos.x+300*Fast_Sin(cam.dir.y);
obj_player.world_pos.y = cam.pos.y-70;
obj_player.world_pos.z = cam.pos.z+300*Fast_Cos(cam.dir.y);

// generate rotation matrix around y axis
Build_XYZ_Rotation_MATRIX4X4(0, cam.dir.y+turning, 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);

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

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


// insert the tanks in the world
for (index = 0; index < NUM_TANKS; index++)
    {
    // reset the object (this only matters for backface and object removal)
    Reset_OBJECT4DV1(&obj_tank);

    // generate rotation matrix around y axis
    Build_XYZ_Rotation_MATRIX4X4(0, tanks[index].w, 0, &mrot);

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

    // set position of tank
    obj_tank.world_pos.x = tanks[index].x;
    obj_tank.world_pos.y = tanks[index].y;
    obj_tank.world_pos.z = tanks[index].z;

    // attempt to cull object   
    if (!Cull_OBJECT4DV1(&obj_tank, &cam, CULL_OBJECT_XYZ_PLANES))
       {
       // if we get here then the object is visible at this world position
       // so we can insert it into the rendering list
       // perform local/model to world transform
       Model_To_World_OBJECT4DV1(&obj_tank, TRANSFORM_TRANS_ONLY);

       // insert the object into render list
       Insert_OBJECT4DV1_RENDERLIST4DV12(&rend_list, &obj_tank,0,0);
       } // end if
 
    } // end for

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

// insert the towers in the world
for (index = 0; index < NUM_TOWERS; index++)
    {
    // reset the object (this only matters for backface and object removal)
    Reset_OBJECT4DV1(&obj_tower);

    // set position of tower
    obj_tower.world_pos.x = towers[index].x;
    obj_tower.world_pos.y = towers[index].y;
    obj_tower.world_pos.z = towers[index].z;

    // attempt to cull object   
    if (!Cull_OBJECT4DV1(&obj_tower, &cam, CULL_OBJECT_XYZ_PLANES))
       {
       // if we get here then the object is visible at this world position
       // so we can insert it into the rendering list
       // perform local/model to world transform
       Model_To_World_OBJECT4DV1(&obj_tower);

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

       } // end if
 
    } // end for

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

// seed number generator so that modulation of markers is always the same
srand(13);

// insert the ground markers into the world
for (int index_x = 0; index_x < NUM_POINTS_X; index_x++)
    for (int index_z = 0; index_z < NUM_POINTS_Z; index_z++)
        {
        // reset the object (this only matters for backface and object removal)
        Reset_OBJECT4DV1(&obj_marker);

        // set position of tower
        obj_marker.world_pos.x = RAND_RANGE(-100,100)-UNIVERSE_RADIUS+index_x*POINT_SIZE;
        obj_marker.world_pos.y = obj_marker.max_radius;
        obj_marker.world_pos.z = RAND_RANGE(-100,100)-UNIVERSE_RADIUS+index_z*POINT_SIZE;

        // attempt to cull object   
        if (!Cull_OBJECT4DV1(&obj_marker, &cam, CULL_OBJECT_XYZ_PLANES))
           {
           // if we get here then the object is visible at this world position
           // so we can insert it into the rendering list
           // perform local/model to world transform
           Model_To_World_OBJECT4DV1(&obj_marker);

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

           } // end if

        } // end for

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

// remove backfaces
Remove_Backfaces_RENDERLIST4DV1(&rend_list, &cam);

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

// 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);

// draw instructions
Draw_Text_GDI("Press ESC to exit. Press Arrow Keys to Move. Space for TURBO.", 0, 0, RGB(0,255,0), lpddsback);

// lock the back buffer
DDraw_Lock_Back_Surface();

// reset number of polys rendered
debug_polys_rendered_per_frame = 0;

// render the object
Draw_RENDERLIST4DV1_Solid(&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

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