void background_init()
{
// 1 map_base_addr = 1<<11 bytes = 1 full BG_SIZE_0 map
sm_parallaxMap = (u16*)MAP_BASE_ADR(31);
BGCTRL[0] = SCREEN_BASE(31) | BG_SIZE_0 | BG_256_COLOR;
BG_OFFSET[0].x = 0; BG_OFFSET[0].y = 0;
sm_backgroundMap = (u16*)MAP_BASE_ADR(30);
BGCTRL[1] = SCREEN_BASE(30) | BG_SIZE_0 | BG_256_COLOR;
BG_OFFSET[1].x = 0; BG_OFFSET[1].y = 0;
internal_load_sprite_sheet();
// 256x256 = 32x32 tiles
for (int i = 0; i < 32 * 32; ++i)
*(sm_backgroundMap + i) = rand(1, 11);
// for the parallax map I have to sprites of 32*64 (4x8 blocks)
// starting from sprite 12
int count = 12;
const int deco1_posx = 1;
const int deco2_posx = 15;
const int bottom_tile_y = 20;
for (int j = 0; j < 8; ++j)
{
for (int i = 0; i < 4; ++i)
{
*(sm_parallaxMap + (bottom_tile_y - 8 + j)*32 + i + deco1_posx) = count;
++count;
}
}
for (int j = 0; j < 8; ++j)
{
for (int i = 0; i < 4; ++i)
{
*(sm_parallaxMap + (bottom_tile_y - 8 + j)*32 + i + deco2_posx) = count;
++count;
}
}
}
Layer(uint8_t num)
: vram((uint16_t*)MAP_BASE_ADR(28 + num)),
tilemap(0),
x_offset(0), y_offset(0)
{}
//---------------------------------------------------------------------------------
void consoleCls() {
//---------------------------------------------------------------------------------
*((u32 *)MAP_BASE_ADR(consoleMap)) = 0x00200020;
CpuFastSet( MAP_BASE_ADR(consoleMap), MAP_BASE_ADR(consoleMap), FILL | (0x800/4));
}
int main()
{
irqInit();
SetMode((LCDC_BITS)(MODE_1 | BG0_ON | BG2_ON | OBJ_ENABLE));
irqSet(IRQ_VBLANK, vblank);
irqEnable(IRQ_VBLANK);
float xpos = 0;
float ypos = 0;
float xdir = 0;
float ydir = 0;
int dir = 0;
BG_COLORS[0] = RGB5(31, 0, 31);
CpuFastSet(tileset_img, OBJ_BASE_ADR, COPY32 | (256 * 16) / 4);
CpuFastSet(tileset_pal, OBJ_COLORS, COPY32 | (256 / 4));
CpuFastSet(tileset_img, PATRAM4(0, 0), COPY32 | (256 * 16) / 4);
CpuFastSet(tileset_pal, BG_COLORS, COPY32 | (256 / 4));
// mock up a map
/* ((vu16*)MAP_BASE_ADR(MAP_BASE_BLOCK))[0] = 0;
((vu16*)MAP_BASE_ADR(MAP_BASE_BLOCK))[1] = 1;
((vu16*)MAP_BASE_ADR(MAP_BASE_BLOCK))[32] = 32;
((vu16*)MAP_BASE_ADR(MAP_BASE_BLOCK))[33] = 33;
((vu16*)MAP_BASE_ADR(MAP_BASE_BLOCK))[64] = 64;
((vu16*)MAP_BASE_ADR(MAP_BASE_BLOCK))[65] = 65; */
for (int y = 0; y < 32; ++y)
{
for (int x = 0; x < 32; ++x)
{
((vu16*)MAP_BASE_ADR(MAP_BASE_BLOCK + 1))[x + y * 32] = 5;
}
}
for (int x = 0; x < 32; ++x) ((vu8*)MAP_BASE_ADR(MAP_BASE_BLOCK + 1))[x] = 16;
for (int x = 0; x < 32; ++x) ((vu8*)MAP_BASE_ADR(MAP_BASE_BLOCK + 1))[31 * 32 + x] = 16;
for (int y = 0; y < 32; ++y) ((vu8*)MAP_BASE_ADR(MAP_BASE_BLOCK + 1))[y * 32] = 16;
for (int y = 0; y < 32; ++y) ((vu8*)MAP_BASE_ADR(MAP_BASE_BLOCK + 1))[y * 32 + 31] = 16;
BGCTRL[0] = SCREEN_BASE(MAP_BASE_BLOCK + 0) | CHAR_BASE(0) | BG_SIZE_0 | BG_16_COLOR | BG_PRIORITY(1); // | CHAR_PALETTE(1);
BGCTRL[2] = SCREEN_BASE(MAP_BASE_BLOCK + 1) | CHAR_BASE(0) | BG_SIZE_1 | BG_16_COLOR | BG_PRIORITY(0); // | CHAR_PALETTE(1);
float rot = 0.0f;
float last_rot = rot;
float bg_scroll = 0;
int frame = 0;
while (1)
{
int sprite_frame = (int(floor(bg_scroll)) >> 3) & 1;
if (fabs(xdir) < 1e-1) sprite_frame = 0;
// if (ypos > 0) sprite_frame = 2;
int tile_start = sprite_frame * 2;
int pal = 0;
for (int i = 0; i < 128; ++i)
{
sprites[i].attr0 = ATTR0_DISABLED;
}
int sprite = 0;
// sprites[sprite].attr0 = OBJ_Y(int(ypos) + 80 - 8) | ATTR0_COLOR_16 | ATTR0_WIDE;
// sprites[sprite].attr1 = OBJ_X(int(xpos) + 120) | OBJ_SIZE(Sprite_16x8) | (dir ? ATTR1_FLIP_X : 0);
sprites[sprite].attr0 = OBJ_Y(int(0) + 80 - 16) | ATTR0_COLOR_16 | ATTR0_WIDE;
sprites[sprite].attr1 = OBJ_X(int(0) + 120 - 8) | OBJ_SIZE(Sprite_16x8) | (dir ? ATTR1_FLIP_X : 0);
sprites[sprite].attr2 = OBJ_CHAR(tile_start) | ATTR2_PALETTE(pal); // | OBJ_TRANSLUCENT;
sprite++;
// sprites[sprite].attr0 = OBJ_Y(int(ypos) + 80) | ATTR0_COLOR_16 | ATTR0_SQUARE;
// sprites[sprite].attr1 = OBJ_X(int(xpos) + 120) | OBJ_SIZE(Sprite_16x16) | (dir ? ATTR1_FLIP_X : 0);
sprites[sprite].attr0 = OBJ_Y(int(0) + 80 - 8) | ATTR0_COLOR_16 | ATTR0_SQUARE;
sprites[sprite].attr1 = OBJ_X(int(0) + 120 - 8) | OBJ_SIZE(Sprite_16x16) | (dir ? ATTR1_FLIP_X : 0);
sprites[sprite].attr2 = OBJ_CHAR(tile_start + 32) | ATTR2_PALETTE(pal); // | OBJ_TRANSLUCENT;
sprite++;
float st = sin(last_rot);
float ct = cos(last_rot);
last_rot = last_rot + (rot - last_rot) * 0.1;
int pa = int(0x100 * ct);
int pb =-int(0x100 * st);
int pc = int(0x100 * st);
int pd = int(0x100 * ct);
// don't setup any hw-regs until vblank
VBlankIntrWait();
// setup bg0 scroll
REG_BG0HOFS = int(bg_scroll) & 0xFFFF;
// setup bg2 transform
REG_BG2PA = pa;
REG_BG2PB = pb;
REG_BG2PC = pc;
REG_BG2PD = pd;
REG_BG2X = (int(xpos) << 8) - (pa * 120 + pb * 80);
REG_BG2Y = (int(ypos) << 8) - (pc * 120 + pd * 80);
++frame;
CpuSet(sprites, OAM, (128 * sizeof(OAM[0])) / 2);
scanKeys();
u32 held = keysHeld();
u32 down = keysDown();
u32 up = keysUp();
float upx = sin(rot);
float upy = -cos(rot);
float leftx = upy;
float lefty = -upx;
if (KEY_UP & down) { xdir = upx * 5; ydir = upy * 5; }
if (KEY_L & down) { rot += M_PI / 2; }
if (KEY_R & down) { rot -= M_PI / 2; }
/* if (KEY_L & up) { rot += M_PI / 4; }
if (KEY_R & up) { rot -= M_PI / 4; } */
// external forces
#if 0
xdir *= 0.95; // friction
ydir *= 0.95; // friction
#else
float a = leftx * xdir + lefty * ydir; // dot(dir, left)
float b = upx * xdir + upy * ydir; // dot(dir, up)
float new_xdir = upx * b + 0.85 * leftx * a;
float new_ydir = upy * b + 0.85 * lefty * a;
xdir = new_xdir;
ydir = new_ydir;
#endif
if (fabs(xdir) < 1e-1) xdir = 0;
if (fabs(ydir) < 1e-1) ydir = 0;
if (KEY_RIGHT & held) { xdir -= leftx * 0.5f; ydir -= lefty * 0.5f; dir = 0; }
if (KEY_LEFT & held) { xdir += leftx * 0.5f; ydir += lefty * 0.5f; dir = 1; }
xdir -= upx * 0.25; // gravity
ydir -= upy * 0.25; // gravity
float last_xpos = xpos;
float last_ypos = ypos;
// apply forces
xpos += xdir;
ypos += ydir;
// resolve constraints
if (xpos < 0) xpos = 0;
if (xpos > 255) xpos = 255;
if (ypos < 0) ypos = 0;
if (ypos > 255) ypos = 255;
float delta_xpos = last_xpos - xpos;
float delta_ypos = last_ypos - ypos;
bg_scroll += (delta_xpos * leftx + delta_ypos * lefty) * 0.5f;
}
return 0;
}
int main() {
// Set up the interrupt handlers
irqInit();
// Enable Vblank Interrupt to allow VblankIntrWait
irqEnable(IRQ_VBLANK);
// Allow Interrupts
REG_IME = 1;
u32 i, scrollx, scrolldelay, textindex;
u16 *temppointer;
// load the palette for the background, 7 colors
temppointer = BG_COLORS;
for(i=0; i<7; i++) {
*temppointer++ = palette[i];
}
// load the font into gba video mem (48 characters, 4bit tiles)
CpuFastSet(r6502_portfont_bin, (u16*)VRAM,(r6502_portfont_bin_size/4) | COPY32);
// clear screen map with tile 0 ('space' tile) (256x256 halfwords)
*((u32 *)MAP_BASE_ADR(31)) =0;
CpuFastSet( MAP_BASE_ADR(31), MAP_BASE_ADR(31), FILL | COPY32 | (0x800/4));
// set screen H and V scroll positions
BG_OFFSET[0].x = 0; BG_OFFSET[0].y = 0;
// initialize our variables
scrollx = 0;
textindex = 0;
scrolldelay = 0;
// put the '@' symbol on the top of the screen to show how
// the screen is only scrolling 7 pixels - to reveal the
// illusion of how the scroller works
*((u16 *)MAPADDRESS + 1) = 0x20; // 0x20 == '@'
// draw a row of text from beginning of message
updatescrolltext(0);
// set the screen base to 31 (0x600F800) and char base to 0 (0x6000000)
BGCTRL[0] = SCREEN_BASE(31);
// screen mode & background to display
SetMode( MODE_0 | BG0_ON );
while(1) {
VBlankIntrWait();
// check if we reached our delay
if(scrolldelay == DELAY) {
// yes, the delay is complete, so let's reset it
scrolldelay = 0;
// check if we reached our scrollcount
if(scrollx == (TILEWIDTH-1)) {
// yes, we've scrolled enough, so let's reset the count
scrollx = 0;
// check if we reached the end of our scrolltext
// and if so we need to restart our index
if(message[textindex] == 0) textindex = 0;
else textindex++;
// finally, let's update the scrolltext with the current text index
updatescrolltext(textindex);
}
else scrollx++;
}
else scrolldelay++;
// update the hardware horizontal scroll register
BG_OFFSET[0].x = scrollx;
}
}