From b06fef8700bc6c2985a5a4808d9a019a1c8abdf9 Mon Sep 17 00:00:00 2001
From: tangstad <tangstad@pvv.ntnu.no>
Date: Mon, 5 Dec 2005 22:18:43 +0000
Subject: [PATCH] Added spriteloader.

---
 gba/cartest/src/cartest.cpp | 54 ++++++++++++++++++++++---------------
 1 file changed, 33 insertions(+), 21 deletions(-)

diff --git a/gba/cartest/src/cartest.cpp b/gba/cartest/src/cartest.cpp
index 74ce7b3..05d4f11 100644
--- a/gba/cartest/src/cartest.cpp
+++ b/gba/cartest/src/cartest.cpp
@@ -30,7 +30,7 @@ typedef s32 FIXED; // 32bit FIXED in 24.8 format
 #define lut_cos(x)  _sinLUT[(x + (SIN_SIZE>>2)) & SIN_MASK]
 
 
-#define NUMSMOKES 30
+#define NUMSMOKES 20
 
 unsigned int frame;
 
@@ -45,9 +45,10 @@ class Smoke {
   int num_entries;
   s8* smoke_frame;
   u8 next_smoke;
+  u16 sprite_start;
 
 public:
-  Smoke(int num_entries, OBJATTR* start) {
+  Smoke(int num_entries, OBJATTR* start, u16 sprite_index) {
     oam = start;
     smoke_frame = new s8[num_entries];
     next_smoke = 0;
@@ -58,6 +59,7 @@ public:
       // 6 == off
       smoke_frame[i] = 6;
     }
+    sprite_start = sprite_index;
   }
   void increase_frame_counts() {
     for (u8 i=0; i<num_entries; i++) {
@@ -79,7 +81,7 @@ public:
   
   void update_sprites() {
     for (u8 i=0; i<num_entries; i++)
-      oam[i].attr2 = OBJ_CHAR(528 + 2*smoke_frame[i]);	
+      oam[i].attr2 = OBJ_CHAR(sprite_start + 2*smoke_frame[i]);	
   }
 
   ~Smoke() {
@@ -156,6 +158,24 @@ public:
   int speed, angle;
 };
 
+class SpriteLoader {
+  u32 free_space;
+  u16 sprite_index;
+public:
+  SpriteLoader() {
+    free_space = (u32)BITMAP_OBJ_BASE_ADR;
+    sprite_index = 512;
+  }
+  u16 load_from_memory(const void *source, u8 blocks) {
+    int bytes = blocks*8;
+    CpuFastSet(source, (void*)free_space, COPY32 | bytes/4);
+    free_space += bytes;
+    u16 pre_index = sprite_index;
+    sprite_index += blocks * 2 / 8;
+    return pre_index;
+  }
+};
+
 int main(void)
 {
 	OBJATTR oe_buffer[2+NUMSMOKES+10];
@@ -163,37 +183,29 @@ int main(void)
 
 	// Set up the interrupt handlers
 	InitInterrupt();
-
 	SetInterrupt( IE_VBL, VblankInterrupt);
-
 	// Enable Vblank Interrupt to allow VblankIntrWait
 	EnableInterrupt(IE_VBL);
-
 	// Allow Interrupts
 	REG_IME = 1;
-
 	// screen mode, background and objects to display
        	SetMode((LCDC_BITS)(MODE_4 | BG2_ON | OBJ_ON | OBJ_1D_MAP ));
 
 	u32 white = 0x10101010; 
-	CpuFastSet(&white, (void*)VRAM, FILL | 240*160/4);
+       	CpuFastSet(&white, (void*)VRAM, FILL | 240*160/4);
 	FadeToPalette((const u16*)car_pal_bin, 1);
-	
-	u32 free_space = (u32)BITMAP_OBJ_BASE_ADR;
-	CpuFastSet(car_bin, (void*)free_space, COPY32 | car_bin_size/4);
-	free_space += car_bin_size;
-	CpuFastSet(car_blue_bin, (void*)free_space, COPY32 | car_bin_size/4);
-	free_space += car_blue_bin_size;
 
+	SpriteLoader loader;
+
+	u16 red_index = loader.load_from_memory(car_bin, car_bin_size/8);
+	u16 blue_index = loader.load_from_memory(car_blue_bin, car_bin_size/8);
+	u16 smoke_index = loader.load_from_memory(smoke_bin, smoke_bin_size/8);
+	
        	CpuFastSet(car_pal_bin, OBJ_COLORS, COPY32 | car_pal_bin_size/4);
 
-	// load smoke
-	CpuFastSet(smoke_bin, (void*)free_space, COPY32 | smoke_bin_size/4);
-	free_space += smoke_bin_size;
-
-	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]);
+	Car red(102, 72, &oa_buffer[0], &oe_buffer[0], 0, red_index);
+	Car blue(122, 72, &oa_buffer[1], &oe_buffer[1], 1, blue_index);
+	Smoke smoke(NUMSMOKES, &oe_buffer[2], smoke_index);
 
 	while (1) {
 		if (KeysHeld() & KEY_RIGHT) {