From 60cb1dbbc9f61c48aca676adf655d901be1efcc5 Mon Sep 17 00:00:00 2001
From: tangstad <tangstad@pvv.ntnu.no>
Date: Mon, 5 Dec 2005 21:33:37 +0000
Subject: [PATCH] Objectified cars and smoke.

---
 gba/cartest/src/cartest.cpp | 285 +++++++++++++++++-------------------
 1 file changed, 133 insertions(+), 152 deletions(-)

diff --git a/gba/cartest/src/cartest.cpp b/gba/cartest/src/cartest.cpp
index 8823845..998e3f3 100644
--- a/gba/cartest/src/cartest.cpp
+++ b/gba/cartest/src/cartest.cpp
@@ -32,10 +32,8 @@ typedef s32 FIXED; // 32bit FIXED in 24.8 format
 
 #define NUMSMOKES 30
 
-u16 PaletteBuffer[256];
 OBJATTR oe_buffer[2+NUMSMOKES+10];
 OBJAFFINE *const oa_buffer = (OBJAFFINE*)oe_buffer;
-s8 smoke_frame[NUMSMOKES];
 
 unsigned int frame;
 
@@ -45,21 +43,122 @@ void VblankInterrupt()
 	ScanKeys();
 }
 
-typedef struct {
+class Smoke {
+  OBJATTR* oam;
+  int num_entries;
+public:
+  s8* smoke_frame;
+  u8 next_smoke;
+  Smoke(int num_entries, OBJATTR* start) {
+    oam = start;
+    smoke_frame = new s8[num_entries];
+    next_smoke = 0;
+    this->num_entries = num_entries;
+    for (u16 i=0; i<num_entries; i++) {
+      oam[i].attr1 = OBJ_X(20+(i*10));
+      oam[i].attr0 = OBJ_256_COLOR | OBJ_Y(40);
+      // 6 == off
+      smoke_frame[i] = 6;
+    }
+  }
+  void increase_frame_counts() {
+    for (u8 i=0; i<num_entries; i++) {
+      if (smoke_frame[i] < 6) {
+	smoke_frame[i] += 1;
+      }
+    }
+  }
+
+  void dump_at(int x, int y) {
+    smoke_frame[next_smoke] = 0;
+    oam[next_smoke].attr1 = OBJ_X(x);
+    oam[next_smoke].attr0 = OBJ_256_COLOR | OBJ_Y(y);
+    next_smoke += 1;
+    if (next_smoke>=num_entries) {
+      next_smoke = 0;
+    }
+  }
+  
+  void update_sprites() {
+    for (u8 i=0; i<num_entries; i++)
+      oam[i].attr2 = OBJ_CHAR(528 + 2*smoke_frame[i]);	
+  }
+
+  ~Smoke() {
+    delete smoke_frame;
+  }
+};
+
+class Car {
+  OBJAFFINE* aff_matrix;
+  OBJATTR* oam;
+  int index;
+public:
+  Car(int x, int y, OBJAFFINE* aff, OBJATTR* entry, int aff_index, 
+      int sprite_index) {
+    this->x = INT2FIX(x);
+    this->y = INT2FIX(y);
+    speed = 0;
+    angle = 0;
+    aff_matrix = aff;
+    oam = entry;
+    index = aff_index;
+    oam->attr2 = OBJ_CHAR(sprite_index);
+  }
+  void rotate(int alpha) {
+    angle += alpha;
+    if (angle < 0) {
+      angle += 512;
+    } else if (angle >= 512) {
+      angle -= 512;
+    }
+  }
+  void speedup() {
+    if (speed<30) {
+      speed += 1;
+    }
+  }
+  void slowdown() {
+    if (speed>0) {
+      speed -= 1;
+    }
+  }
+
+  void update_position() {
+    x -= (speed >> 3)*lut_sin(angle);
+    y -= (speed >> 3)*lut_cos(angle);
+    
+    if (x>=INT2FIX(232)) {
+      x -= INT2FIX(256);
+    } else if (x<INT2FIX(-24)) {
+      x += INT2FIX(256);
+    }
+    
+    if (y>=INT2FIX(152)) {
+      y -= INT2FIX(176);
+    } else if (y<INT2FIX(-24)) {
+      y += INT2FIX(176);
+    }
+  }
+
+  void update_matrix() {
+    aff_matrix->pa = lut_cos(angle);
+    aff_matrix->pb = -lut_sin(angle);
+    aff_matrix->pc = lut_sin(angle);
+    aff_matrix->pd = lut_cos(angle);
+  }
+
+  void update_oam() {
+    oam->attr1 = OBJ_SIZE(1) | OBJ_ROT_SCALE(index) | OBJ_X(FIX2INT(x));
+    oam->attr0 = OBJ_256_COLOR | OBJ_DOUBLE | OBJ_ROT_SCALE_ON | OBJ_Y(FIX2INT(y));
+  }
+
   FIXED x, y;
   int speed, angle;
-} Car;
-
+};
 
 int main(void)
 {
-	OBJATTR*red_car = &oe_buffer[0];
-	OBJATTR*blue_car = &oe_buffer[1];
-	OBJAFFINE*red_car_aff = &oa_buffer[0];
-	OBJAFFINE*blue_car_aff = &oa_buffer[1];
-	// We'll make a few smoke clouds
-	OBJATTR*smokes = &oe_buffer[2];
-
 	// Set up the interrupt handlers
 	InitInterrupt();
 
@@ -90,178 +189,60 @@ int main(void)
 	CpuFastSet(smoke_bin, (void*)free_space, COPY32 | smoke_bin_size/4);
 	free_space += smoke_bin_size;
 
-	red_car->attr2 = OBJ_CHAR(512);
-	blue_car->attr2 = OBJ_CHAR(520);
-
-	u8 next_smoke = 0;
-
-	u8 i;
-	for (i=0; i<NUMSMOKES; i++) {
-	  smokes[i].attr1 = OBJ_X(20+(i*10));
-	  smokes[i].attr0 = OBJ_256_COLOR | OBJ_Y(40);
-	  // 6 == off
-	  smoke_frame[i] = 6;
-	}
-
-	Car red, blue;
-
-	red.x = INT2FIX(102);
-	red.y = INT2FIX(72);
-	blue.x = INT2FIX(122);
-	blue.y = INT2FIX(72);
-	red.speed = 0;
-	red.angle = 0;
-	blue.speed = 0;
-	blue.angle = 0;
+	Car red(102, 72, &oa_buffer[0], &oe_buffer[0], 0, 512);
+	Car blue(122, 72, &oa_buffer[1], &oe_buffer[1], 1, 520);
+	Smoke smoke(NUMSMOKES, &oe_buffer[2]);
 
 	while (1) {
 		if (KeysHeld() & KEY_RIGHT) {
-		  red.angle -= 8;
+		  red.rotate(-8);
 		} else if (KeysHeld() & KEY_LEFT) {
-		  red.angle += 8;
+		  red.rotate(8);
 		}
-		if (red.angle < 0) {
-		  red.angle += 512;
-		} else if (red.angle >= 512) {
-		  red.angle -= 512;
-		}
-		
 		if (KeysHeld() & KEY_A) {
-		  blue.angle -= 8;
+		  blue.rotate(-8);
 		} else if (KeysHeld() & KEY_B) {
-		  blue.angle += 8;
-		}
-		if (blue.angle < 0) {
-		  blue.angle += 512;
-		} else if (blue.angle >= 512) {
-		  blue.angle -= 512;
+		  blue.rotate(8);
 		}
 		
 		if (KeysHeld() & KEY_L) {
-		  if ((red.speed<30) && (red.speed>=0)) {
-		    // slow speedup
-		    red.speed += 1;
-		  } else if (red.speed<0) {
-		    // break if we're going backward
-		    red.speed += 2;
-		  }
+		  red.speedup();
 		}
 
 		if (KeysHeld() & KEY_R) {
-		  if ((blue.speed<30) && (blue.speed>=0)) {
-		    // slow speedup
-		    blue.speed += 1;
-		  } else if (blue.speed<0) {
-		    // break if we're going backward
-		    blue.speed += 2;
-		  }
+		  blue.speedup();
 		}
 
-
-		/* Disabled */		
-/* 		if (KeysHeld() & KEY_B) { */
-/* 		  if ((red.speed>=-5) && (red.speed<=0)) { */
-/* 		    // slow speedup */
-/* 		    red.speed -= 1; */
-/* 		  } else if (red.speed>0) { */
-/* 		    // break if we're going forward */
-/* 		    red.speed -= 2; */
-/* 		  } */
-/* 		}  */
-
-		// slow down if we're not doing anything
 		if (!(KeysHeld() & KEY_L)) {
-		  if (red.speed>0) {
-		    red.speed -= 1;
-		  } else if (red.speed<0) {
-		    red.speed += 1;
-		  }
+		  red.slowdown();
 		}
-
 		if (!(KeysHeld() & KEY_R)) {
-		  if (blue.speed>0) {
-		    blue.speed -= 1;
-		  } else if (blue.speed<0) {
-		    blue.speed += 1;
-		  }
+		  blue.slowdown();
 		}
 
-		red.x -= (red.speed >> 3)*lut_sin(red.angle);
-		red.y -= (red.speed >> 3)*lut_cos(red.angle);
+		red.update_position();
+		red.update_matrix();
+		red.update_oam();
 
-		if (red.x>=INT2FIX(232)) {
-		  red.x -= INT2FIX(256);
-		} else if (red.x<INT2FIX(-24)) {
-		  red.x += INT2FIX(256);
-		}
+		blue.update_position();
+		blue.update_matrix();
+		blue.update_oam();
 
-		if (red.y>=INT2FIX(152)) {
-		  red.y -= INT2FIX(176);
-		} else if (red.y<INT2FIX(-24)) {
-		  red.y += INT2FIX(176);
-		}
-
-		red_car_aff->pa = lut_cos(red.angle);
-		red_car_aff->pb = -lut_sin(red.angle);
-		red_car_aff->pc = lut_sin(red.angle);
-		red_car_aff->pd = lut_cos(red.angle);
-
-		red_car->attr1 = OBJ_SIZE(1) | OBJ_X(FIX2INT(red.x));
-		red_car->attr0 = OBJ_256_COLOR | OBJ_DOUBLE | OBJ_ROT_SCALE_ON | OBJ_Y(FIX2INT(red.y));
-
-		blue.x -= (blue.speed >> 3)*lut_sin(blue.angle);
-		blue.y -= (blue.speed >> 3)*lut_cos(blue.angle);
-
-		if (blue.x>=INT2FIX(232)) {
-		  blue.x -= INT2FIX(256);
-		} else if (blue.x<INT2FIX(-24)) {
-		  blue.x += INT2FIX(256);
-		}
-
-		if (blue.y>=INT2FIX(152)) {
-		  blue.y -= INT2FIX(176);
-		} else if (blue.y<INT2FIX(-24)) {
-		  blue.y += INT2FIX(176);
-		}
-
-		blue_car_aff->pa = lut_cos(blue.angle);
-		blue_car_aff->pb = -lut_sin(blue.angle);
-		blue_car_aff->pc = lut_sin(blue.angle);
-		blue_car_aff->pd = lut_cos(blue.angle);
-
-		blue_car->attr1 = OBJ_SIZE(1) | OBJ_ROT_SCALE(1) | OBJ_X(FIX2INT(blue.x));
-		blue_car->attr0 = OBJ_256_COLOR | OBJ_DOUBLE | OBJ_ROT_SCALE_ON | OBJ_Y(FIX2INT(blue.y));
-
-		// Update smoke cloud frames
 		if ((frame & 3) == 3) {
-		  for (i=0; i<NUMSMOKES; i++) {
-		    if (smoke_frame[i] < 6) {
-		      smoke_frame[i] += 1;
-		    }
-		  }
+		  smoke.increase_frame_counts();
 		}
 
 		// place a new smoke cloud after car if driving
 		// forwards
 		if ((red.speed!=0) && ((frame & 1) == 1)) {
-		  smoke_frame[next_smoke] = 0;
-		  smokes[next_smoke].attr1 = OBJ_X(FIX2INT(red.x)+12);
-		  smokes[next_smoke].attr0 = OBJ_256_COLOR | OBJ_Y(FIX2INT(red.y)+12);
+		  smoke.dump_at(FIX2INT(red.x)+12, FIX2INT(red.y)+12);
 		}
-		next_smoke += 1;
 		if ((blue.speed!=0) && ((frame & 1) == 1)) {
-		  smoke_frame[next_smoke] = 0;
-		  smokes[next_smoke].attr1 = OBJ_X(FIX2INT(blue.x)+12);
-		  smokes[next_smoke].attr0 = OBJ_256_COLOR | OBJ_Y(FIX2INT(blue.y)+12);
+		  smoke.dump_at(FIX2INT(blue.x)+12, FIX2INT(blue.y)+12);
 		}
 
-		next_smoke += 1;		
-		if (next_smoke>=NUMSMOKES) {
-		  next_smoke = 0;
-		}
-		for (i=0; i<NUMSMOKES; i++)
-		  smokes[i].attr2 = OBJ_CHAR(528 + 2*smoke_frame[i]);
-		
+		smoke.update_sprites();
+
 	  	VBlankIntrWait();
 		CpuFastSet(oe_buffer, OAM, COPY32 | sizeof(oe_buffer)/4);
 	}