demoii11_1.cpp

3D游戏编程大师技巧第十一章的源代码

// 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();

Delete_Zbuffer(&zbuffer);

// 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

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

// use these to rotate objects
static float x_ang = 0, y_ang = 0, z_ang = 0;

// state variables for different rendering modes and help
static int wireframe_mode = 1;
static int backface_mode  = 1;
static int lighting_mode  = 1;
static int help_mode      = 1;
static int zsort_mode     = 1;
static int x_clip_mode    = 1;
static int y_clip_mode    = 1;
static int z_clip_mode    = 1;
static int z_buffer_mode  = 1;
static int display_mode    = 1;

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, WINDOW_HEIGHT*.5, RGB16Bit(180,180,220), lpddsback);

// draw the ground
Draw_Rectangle(0,WINDOW_HEIGHT*.5, WINDOW_WIDTH, WINDOW_HEIGHT, RGB16Bit(190,190,230), lpddsback);

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

// game logic here...

// reset the render list
Reset_RENDERLIST4DV2(&rend_list);

// modes and lights

// wireframe mode
if (keyboard_state[DIK_W]) 
   {
   // toggle wireframe mode
   if (++wireframe_mode > 1)
       wireframe_mode=0;
   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 (lights2[AMBIENT_LIGHT_INDEX].state == LIGHTV2_STATE_ON)
      lights2[AMBIENT_LIGHT_INDEX].state = LIGHTV2_STATE_OFF;
   else
      lights2[AMBIENT_LIGHT_INDEX].state = LIGHTV2_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 (lights2[INFINITE_LIGHT_INDEX].state == LIGHTV2_STATE_ON)
      lights2[INFINITE_LIGHT_INDEX].state = LIGHTV2_STATE_OFF;
   else
      lights2[INFINITE_LIGHT_INDEX].state = LIGHTV2_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 (lights2[POINT_LIGHT_INDEX].state == LIGHTV2_STATE_ON)
      lights2[POINT_LIGHT_INDEX].state = LIGHTV2_STATE_OFF;
   else
      lights2[POINT_LIGHT_INDEX].state = LIGHTV2_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 (lights2[SPOT_LIGHT2_INDEX].state == LIGHTV2_STATE_ON)
      lights2[SPOT_LIGHT2_INDEX].state = LIGHTV2_STATE_OFF;
   else
      lights2[SPOT_LIGHT2_INDEX].state = LIGHTV2_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_S])
   {
   // toggle z sorting
   zsort_mode = -zsort_mode;
   Wait_Clock(100); // wait, so keyboard doesn't bounce
   } // end if

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

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

// forward/backward
if (keyboard_state[DIK_UP])
   {
   // move forward
   if ( (cam_speed+=1) > MAX_SPEED) cam_speed = MAX_SPEED;
   } // end if
else
if (keyboard_state[DIK_DOWN])
   {
   // move backward
   if ((cam_speed-=1) < -MAX_SPEED) cam_speed = -MAX_SPEED;
   } // end if

// rotate around y axis or yaw
if (keyboard_state[DIK_RIGHT])
   {
   cam.dir.y+=5;
   } // end if

if (keyboard_state[DIK_LEFT])
   {
   cam.dir.y-=5;
   } // end if


// move to next object
if (keyboard_state[DIK_N])
   {
   if (++curr_object >= NUM_OBJECTS)
      curr_object = 0;

   // update pointer
   obj_work = &obj_array[curr_object];
   Wait_Clock(100); // wait, so keyboard doesn't bounce
   } // end if


// decelerate camera
if (cam_speed > (CAM_DECEL) ) cam_speed-=CAM_DECEL;
else
if (cam_speed < (-CAM_DECEL) ) cam_speed+=CAM_DECEL;
else
   cam_speed = 0;

// move camera
cam.pos.x += cam_speed*Fast_Sin(cam.dir.y);
cam.pos.z += cam_speed*Fast_Cos(cam.dir.y);

// move point light source in ellipse around game world
lights2[POINT_LIGHT_INDEX].pos.x = 1000*Fast_Cos(plight_ang);
lights2[POINT_LIGHT_INDEX].pos.y = 100;
lights2[POINT_LIGHT_INDEX].pos.z = 1000*Fast_Sin(plight_ang);

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

// move spot light source in ellipse around game world
lights2[SPOT_LIGHT2_INDEX].pos.x = 1000*Fast_Cos(slight_ang);
lights2[SPOT_LIGHT2_INDEX].pos.y = 200;
lights2[SPOT_LIGHT2_INDEX].pos.z = 1000*Fast_Sin(slight_ang);

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

obj_work->world_pos.x = cam.pos.x + 150*Fast_Sin(cam.dir.y);
obj_work->world_pos.y = cam.pos.y + 0;
obj_work->world_pos.z = cam.pos.z + 150*Fast_Cos(cam.dir.y);

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

////////////////////////////////////////////////////////
// insert the scenery into universe
for (index = 0; index < NUM_SCENE_OBJECTS; index++)
    {
    // reset the object (this only matters for backface and object removal)
    Reset_OBJECT4DV2(&obj_scene);

    // set position of tower
    obj_scene.world_pos.x = scene_objects[index].x;
    obj_scene.world_pos.y = scene_objects[index].y;
    obj_scene.world_pos.z = scene_objects[index].z;

    // attempt to cull object   
    if (!Cull_OBJECT4DV2(&obj_scene, &cam, CULL_OBJECT_XYZ_PLANES))
       {
       MAT_IDENTITY_4X4(&mrot);

       // rotate the local coords of the object
       Transform_OBJECT4DV2(&obj_scene, &mrot, TRANSFORM_LOCAL_TO_TRANS,1);

       // perform world transform
       Model_To_World_OBJECT4DV2(&obj_scene, TRANSFORM_TRANS_ONLY);

       // insert the object into render list
       Insert_OBJECT4DV2_RENDERLIST4DV2(&rend_list, &obj_scene,0);

       } // end if
 
    } // end for

///////////////////////////////////////////////////////////////
// insert the player object into universe

// reset the object (this only matters for backface and object removal)
Reset_OBJECT4DV2(obj_work);

// generate rotation matrix around y axis
Build_XYZ_Rotation_MATRIX4X4(x_ang, cam.dir.y + y_ang, z_ang, &mrot);

//MAT_IDENTITY_4X4(&mrot);

// rotate the local coords of the object
Transform_OBJECT4DV2(obj_work, &mrot, TRANSFORM_LOCAL_TO_TRANS,1);

// perform world transform
Model_To_World_OBJECT4DV2(obj_work, TRANSFORM_TRANS_ONLY);

// insert the object into render list
Insert_OBJECT4DV2_RENDERLIST4DV2(&rend_list, obj_work,0);

// update rotation angles
if ((x_ang+=.2) > 360) x_ang = 0;
if ((y_ang+=.4) > 360) y_ang = 0;
if ((z_ang+=.8) > 360) z_ang = 0;

// reset number of polys rendered
debug_polys_rendered_per_frame = 0;
debug_polys_lit_per_frame = 0;

// remove backfaces
if (backface_mode==1)
   Remove_Backfaces_RENDERLIST4DV2(&rend_list, &cam);

// apply world to camera transform
World_To_Camera_RENDERLIST4DV2(&rend_list, &cam);

// clip the polygons themselves now
Clip_Polys_RENDERLIST4DV2(&rend_list, &cam, ((x_clip_mode == 1) ? CLIP_POLY_X_PLANE : 0) | 
                                            ((y_clip_mode == 1) ? CLIP_POLY_Y_PLANE : 0) | 
                                            ((z_clip_mode == 1) ? CLIP_POLY_Z_PLANE : 0) );

// light scene all at once 
if (lighting_mode==1)
   {
   Transform_LIGHTSV2(lights2, 4, &cam.mcam, TRANSFORM_LOCAL_TO_TRANS);
   Light_RENDERLIST4DV2_World2_16(&rend_list, &cam, lights2, 4);
   } // end if

// sort the polygon list (hurry up!)
if (zsort_mode == 1)
   Sort_RENDERLIST4DV2(&rend_list,  SORT_POLYLIST_AVGZ);

// apply camera to perspective transformation
Camera_To_Perspective_RENDERLIST4DV2(&rend_list, &cam);

// apply screen transform
Perspective_To_Screen_RENDERLIST4DV2(&rend_list, &cam);

// lock the back buffer
DDraw_Lock_Back_Surface();

// reset number of polys rendered
debug_polys_rendered_per_frame = 0;

// render the renderinglist
if (wireframe_mode  == 0)
   Draw_RENDERLIST4DV2_Wire16(&rend_list, back_buffer, back_lpitch);
else
if (wireframe_mode  == 1)
   {
   if (z_buffer_mode == 1)
   {
   // initialize zbuffer to 16000 fixed point
   Clear_Zbuffer(&zbuffer, (16000 << FIXP16_SHIFT));
   Draw_RENDERLIST4DV2_SolidZB16(&rend_list, back_buffer, back_lpitch, (UCHAR *)zbuffer.zbuffer, WINDOW_WIDTH*4);
   }
else
   {
   // initialize zbuffer to 32000 fixed point
   Draw_RENDERLIST4DV2_Solid16(&rend_list, back_buffer, back_lpitch);
   } 

   } // end if

// dislay z buffer graphically (sorta)
if (display_mode==-1)
{
// use z buffer visualization mode
// copy each line of the z buffer into the back buffer and translate each z pixel
// into a color
USHORT *screen_ptr = (USHORT *)back_buffer;
UINT   *zb_ptr    =  (UINT *)zbuffer.zbuffer;

for (int y = 0; y < WINDOW_HEIGHT; y++)
    {
    for (int x = 0; x < WINDOW_WIDTH; x++)
        {
        // z buffer is 32 bit, so be carefull
        UINT zpixel = zb_ptr[x + y*WINDOW_WIDTH];
        zpixel = (zpixel/4096 & 0xffff);
        screen_ptr[x + y* (back_lpitch >> 1)] = (USHORT)zpixel;
        } // end for
    } // end for y

} // end if

// unlock the back buffer
DDraw_Unlock_Back_Surface();

sprintf(work_string,"Lighting [%s]: Ambient=%d, Infinite=%d, Point=%d, Spot=%d, BckFceRM [%s], Zsort [%s], Zbuffer [%s]", 
                                                                                 ((lighting_mode == 1) ? "ON" : "OFF"),
                                                                                 lights[AMBIENT_LIGHT_INDEX].state,
                                                                                 lights[INFINITE_LIGHT_INDEX].state, 
                                                                                 lights[POINT_LIGHT_INDEX].state,
                                                                                 lights[SPOT_LIGHT2_INDEX].state,
                                                                                 ((backface_mode == 1) ? "ON" : "OFF"),
                                                                                 ((zsort_mode == 1) ? "ON" : "OFF"),
                                                                                 ((z_buffer_mode == 1) ? "ON" : "OFF"));

Draw_Text_GDI(work_string, 0, WINDOW_HEIGHT-34-16, 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("<N>..............Next object.", 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("<S>..............Toggle Z sorting.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<Z>..............Toggle Z buffering.", 0, text_y+=12, RGB(255,255,255), lpddsback);
    Draw_Text_GDI("<D>..............Toggle Normal 3D display / Z buffer visualization mode.", 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

sprintf(work_string,"Polys Rendered: %d, Polys lit: %d", debug_polys_rendered_per_frame, debug_polys_lit_per_frame);
Draw_Text_GDI(work_string, 0, WINDOW_HEIGHT-34-16-16, RGB(0,255,0), lpddsback);

sprintf(work_string,"CAM [%5.2f, %5.2f, %5.2f]",  cam.pos.x, cam.pos.y, cam.pos.z);

Draw_Text_GDI(work_string, 0, WINDOW_HEIGHT-34-16-16-16, RGB(0,255,0), lpddsback);

// 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

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