demoii12_12.cpp

3D游戏编程大师技巧第十二章的源代码

// position the scenery objects randomly
for (index = 0; index < NUM_SCENE_OBJECTS; index++)
    {
    // randomly position object
    scene_objects[index].x = RAND_RANGE(-UNIVERSE_RADIUS, UNIVERSE_RADIUS);
    scene_objects[index].y = 75; // RAND_RANGE(-(UNIVERSE_RADIUS/2), (UNIVERSE_RADIUS/2));
    scene_objects[index].z = RAND_RANGE(-UNIVERSE_RADIUS, UNIVERSE_RADIUS);

    // select random object, use w to store value
    scene_objects[index].w = RAND_RANGE(0,NUM_OBJECTS-1);
    } // end for


// select random velocities
for (index = 0; index < NUM_SCENE_OBJECTS; index++)
    {
    // randomly position object
    scene_objects_vel[index].x = RAND_RANGE(-MAX_VEL, MAX_VEL);
    scene_objects_vel[index].y = 0; // RAND_RANGE(-MAX_VEL, MAX_VEL);
    scene_objects_vel[index].z = RAND_RANGE(-MAX_VEL, MAX_VEL);
    } // end for

// set up lights
Reset_Lights_LIGHTV2(lights2, MAX_LIGHTS);

// create some working colors
white.rgba = _RGBA32BIT(255,255,255,0);
gray.rgba  = _RGBA32BIT(150,150,150,0);
black.rgba = _RGBA32BIT(0,0,0,0);
red.rgba   = _RGBA32BIT(255,0,0,0);
green.rgba = _RGBA32BIT(0,255,0,0);
blue.rgba  = _RGBA32BIT(0,0,255,0);

// ambient light
Init_Light_LIGHTV2(lights2,               // array of lights to work with
                   AMBIENT_LIGHT_INDEX,   
                   LIGHTV2_STATE_ON,      // turn the light on
                   LIGHTV2_ATTR_AMBIENT,  // ambient light type
                   gray, black, black,    // color for ambient term only
                   NULL, NULL,            // no need for pos or dir
                   0,0,0,                 // no need for attenuation
                   0,0,0);                // spotlight info NA

VECTOR4D dlight_dir = {-1,0,-1,1}; 

// directional light
Init_Light_LIGHTV2(lights2,               // array of lights to work with
                   INFINITE_LIGHT_INDEX,  
                   LIGHTV2_STATE_ON,      // turn the light on
                   LIGHTV2_ATTR_INFINITE, // infinite light type
                   black, gray, black,    // color for diffuse term only
                   NULL, &dlight_dir,     // need direction only
                   0,0,0,                 // no need for attenuation
                   0,0,0);                // spotlight info NA


VECTOR4D plight_pos = {0,200,0,1};

// point light
Init_Light_LIGHTV2(lights2,               // array of lights to work with
                   POINT_LIGHT_INDEX,
                   LIGHTV2_STATE_ON,      // turn the light on
                   LIGHTV2_ATTR_POINT,    // pointlight type
                   black, green, black,    // color for diffuse term only
                   &plight_pos, NULL,     // need pos only
                   0,.002,0,              // linear attenuation only
                   0,0,1);                // spotlight info NA


VECTOR4D slight2_pos = {0,1000,0,1};
VECTOR4D slight2_dir = {-1,0,-1,1};

// spot light2
Init_Light_LIGHTV2(lights2,                  // array of lights to work with
                   SPOT_LIGHT2_INDEX,
                   LIGHTV2_STATE_ON,         // turn the light on
                   LIGHTV2_ATTR_SPOTLIGHT2,  // spot light type 2
                   black, red, black,        // color for diffuse term only
                   &slight2_pos, &slight2_dir, // need pos only
                   0,.001,0,                 // linear attenuation only
                   0,0,1);    


// create lookup for lighting engine
RGB_16_8_IndexedRGB_Table_Builder(DD_PIXEL_FORMAT565,  // format we want to build table for
                                  palette,             // source palette
                                  rgblookup);          // lookup table

// create the z buffer
Create_Zbuffer(&zbuffer,
               WINDOW_WIDTH,
               WINDOW_HEIGHT,
               ZBUFFER_ATTR_32BIT);

// build alpha lookup table
RGB_Alpha_Table_Builder(NUM_ALPHA_LEVELS, rgb_alpha_table);


// load in the background
Create_BOB(&background, 0,0,800,600,1, BOB_ATTR_VISIBLE | BOB_ATTR_SINGLE_FRAME, DDSCAPS_SYSTEMMEMORY, 0, 16); 
Load_Bitmap_File(&bitmap16bit, "cloud03.bmp");
Load_Frame_BOB16(&background, &bitmap16bit,0,0,0,BITMAP_EXTRACT_MODE_ABS);
Unload_Bitmap_File(&bitmap16bit);

// 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();

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

static float alpha_override = 0,
             alpha_inc = .25;

// 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;
static float turning      = 0;
static int pass_mode      = 2;

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, RGB16Bit(0,0,0), lpddsback);
lpddsback->Blt(NULL, background.images[0], NULL, DDBLT_WAIT, NULL); 

// 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...

// 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

// reflection pass mode
if (keyboard_state[DIK_N])
   {
   // toggle help menu 
   if (++pass_mode > 2) pass_mode = 0;
   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

// 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
if (keyboard_state[DIK_RIGHT])
   {
   cam.dir.y+=3;
   
   // add a little turn to object
   if ((turning+=2) > 25)
      turning=25;
   } // end if

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

   // add a little turn to object
   if ((turning-=2) < -25)
      turning=-25;

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

   } // end else

// 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.y = 200;
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;

// 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;

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

// lock the back buffer
DDraw_Lock_Back_Surface();

// render the terrain first /////////////////////////////////
if (pass_mode >= 0)
{
// reset the render list
Reset_RENDERLIST4DV2(&rend_list);

// rotate the local coords of the object
MAT_IDENTITY_4X4(&mrot); 
Transform_OBJECT4DV2(&obj_terrain, &mrot, TRANSFORM_LOCAL_TO_TRANS,1);

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

// insert the object into render list