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unit scrolling;
interface
uses
ctypes, nds9, RotBackgrounds, TextBackgrounds, Multilayer;
procedure scroll(id, width, height: cint);
procedure scrollText();
procedure scrollRotation();
procedure scrollVertical();
procedure scrollHorizontalText();
procedure scrollHorizontalExRotation();
procedure scroll4wayText();
procedure scroll4wayExRotation();
implementation
//reusable scroll function to allow the user to explore
//the maps somewhat
procedure scroll(id, width, height: cint);
var
keys, sx, sy: integer;
begin
keys := 0;
sx := 0;
sy := 0;
while (keys and KEY_B) = 0 do
begin
scanKeys();
keys := keysHeld();
if (keys and KEY_UP) <> 0 then dec(sy);
if (keys and KEY_DOWN) <> 0 then inc(sy);
if (keys and KEY_LEFT) <> 0 then dec(sx);
if (keys and KEY_RIGHT) <> 0 then inc(sx);
if (sx < 0) then sx := 0;
if (sx >= width - 256) then sx := width - 1 - 256;
if (sy < 0) then sy := 0;
if (sy >= height - 192) then sy := height - 1 - 192;
swiWaitForVBlank();
bgSetScroll(id, sx, sy);
bgUpdate();
consoleClear();
iprintf('Scroll x: %d Scroll y: %d'#10, sx, sy);
iprintf('Press ''B'' to exit');
end;
end;
procedure scrollText();
var
keys, sx, sy, width, height: integer;
bg: cint;
begin
keys := 0;
sx := 0;
sy := 0;
width := 256;
height := 512;
//set up a simple text background
videoSetMode(MODE_0_2D);
vramSetBankA(VRAM_A_MAIN_BG);
bg := bgInit(0, BgType_Text8bpp, BgSize_T_256x512, 0,1);
dmaCopy(@TextBackgroundsTiles, bgGetGfxPtr(bg), sizeof(TextBackgroundsTiles));
dmaCopy(@Layer256x512Map, bgGetMapPtr(bg), Layer256x512MapLen);
dmaCopy(@TextBackgroundsPal, BG_PALETTE, sizeof(TextBackgroundsPal));
while (keys and KEY_B) = 0 do
begin
scanKeys();
keys := keysHeld();
if (keys and KEY_UP) <> 0 then dec(sy);
if (keys and KEY_DOWN) <> 0 then inc(sy);
if (keys and KEY_LEFT) <> 0 then dec(sx);
if (keys and KEY_RIGHT) <> 0 then inc(sx);
//clamp the scroll value to the map width and height
if (sx < 0) then sx := 0;
if (sx >= width - 256) then sx := width - 1 - 256;
if (sy < 0) then sy := 0;
if (sy >= height - 192) then sy := height - 1 - 192;
swiWaitForVBlank();
//normally would call bgSetScroll(id, sx, sy) here
//but to demonstrate the hardware difference between
//scrolling rotation and text backgrounds we will use
//direct register access
REG_BG0HOFS^ := sx;
REG_BG0VOFS^ := sy;
consoleClear();
iprintf('Scroll x: %d Scroll y: %d'#10, sx, sy);
iprintf('Press ''B'' to exit');
end;
end;
procedure scrollRotation();
var
keys, sx, sy, width, height: integer;
bg: cint;
begin
keys := 0;
sx := 0;
sy := 0;
width := 512;
height := 512;
videoSetMode(MODE_5_2D);
vramSetBankA(VRAM_A_MAIN_BG);
bg := bgInit(3, BgType_ExRotation, BgSize_ER_512x512, 0,1);
dmaCopy(@TextBackgroundsTiles, bgGetGfxPtr(bg), sizeof(TextBackgroundsTiles));
dmaCopy(@TextBackgroundsPal, BG_PALETTE, sizeof(TextBackgroundsPal));
dmaCopy(@Layer512x512Map, bgGetMapPtr(bg), Layer512x512MapLen);
while (keys and KEY_B)=0 do
begin
scanKeys();
keys := keysHeld();
if (keys and KEY_UP) <> 0 then dec(sy);
if (keys and KEY_DOWN) <> 0 then inc(sy);
if (keys and KEY_LEFT) <> 0 then dec(sx);
if (keys and KEY_RIGHT) <> 0 then inc(sx);
//clamp the scroll value to the map width and height
if (sx < 0) then sx := 0;
if (sx >= width - 256) then sx := width - 1 - 256;
if (sy < 0) then sy := 0;
if (sy >= height - 192) then sy := height - 1 - 192;
swiWaitForVBlank();
//normally would call bgSetScroll(id, sx, sy) here
//but to demonstrate the hardware difference between
//scrolling rotation and text backgrounds we will use
//direct register access
REG_BG3X^ := sx shl 8;
REG_BG3Y^ := sy shl 8;
consoleClear();
iprintf('Scroll x: %d Scroll y: %d'#10, sx, sy);
iprintf('Press ''B'' to exit');
end;
end;
procedure scrollVertical();
var
scroll_y: integer = 0;
map: pcuint16;
bg: cint;
keys: integer = 0;
offset: integer = 0;
begin
videoSetMode(MODE_0_2D);
vramSetBankA(VRAM_A_MAIN_BG);
scroll_y := 0;
bg := bgInit(0, BgType_Text8bpp, BgSize_T_256x256, 0,1);
dmaCopy(@TextBackgroundsTiles, bgGetGfxPtr(bg), sizeof(TextBackgroundsTiles));
dmaCopy(@TextBackgroundsPal, BG_PALETTE, sizeof(TextBackgroundsPal));
map := pcuint16(bgGetMapPtr(bg));
dmaCopy(@Layer256x512Map, map, 32*32*2);
keys := 0;
offset := 0;
while (keys and KEY_B)= 0 do
begin
scanKeys();
keys := keysHeld();
swiWaitForVBlank();
if (keys and KEY_UP) <> 0 then
begin
offset := scroll_y div 8 - 1;
dmaCopy(@Layer256x512Map[(offset and 63) * 32], @map[(offset and 31) * 32], 32 * 2);
dec(scroll_y);
end;
if (keys and KEY_DOWN) <> 0 then
begin
offset := scroll_y div 8 + 24;
dmaCopy(@Layer256x512Map[(offset and 63) * 32], @map[(offset and 31) * 32], 32 * 2);
inc(scroll_y);
end;
bgSetScroll(bg, 0, scroll_y);
bgUpdate();
end;
end;
procedure scrollHorizontalText();
var
scroll_x: integer = 0;
bg: cint;
map: pcuint16;
iy: integer;
keys: integer = 0;
layerOffset: integer = 0;
mapOffset: integer = 0;
begin
videoSetMode(MODE_5_2D);
vramSetBankA(VRAM_A_MAIN_BG);
bg := bgInit(0, BgType_Text8bpp, BgSize_T_512x256, 0,1);
dmaCopy(@TextBackgroundsTiles, bgGetGfxPtr(bg), sizeof(TextBackgroundsTiles));
dmaCopy(@TextBackgroundsPal, BG_PALETTE, sizeof(TextBackgroundsPal));
map := pcuint16(bgGetMapPtr(bg));
for iy := 0 to 23 do
dmaCopy(@Layer512x256Map[iy * 64], @map[iy * 32], 32*2);
while (keys and KEY_B) = 0 do
begin
scanKeys();
keys := keysHeld();
swiWaitForVBlank();
if (keys and KEY_LEFT) <> 0 then
begin
mapOffset := scroll_x div 8 - 1;
layerOffset := (mapOffset and 63);
if(layerOffset >= 32) then layerOffset := layerOffset + (32 * 32 - 32);
for iy := 0 to 23 do
map[layerOffset + (iy * 32)] := Layer512x256Map[(mapOffset and 63) + (iy * 64)] ;
dec(scroll_x);
end;
if (keys and KEY_RIGHT) <> 0 then
begin
mapOffset := scroll_x div 8 + 32;
layerOffset := (mapOffset and 63);
if(layerOffset >= 32) then layerOffset := layerOffset + (32 * 32 - 32);
for iy := 0 to 23 do
map[layerOffset + (iy * 32)] := Layer512x256Map[(mapOffset and 63) + (iy * 64)] ;
inc(scroll_x);
end;
bgSetScroll(bg, scroll_x, 0);
bgUpdate();
end;
end;
procedure scrollHorizontalExRotation();
var
scroll_x: integer = 0;
bg: cint;
map: pcuint16;
iy: integer;
keys: integer = 0;
offset: integer = 0;
begin
videoSetMode(MODE_5_2D);
vramSetBankA(VRAM_A_MAIN_BG);
bg := bgInit(3, BgType_ExRotation, BgSize_ER_512x512, 0,1);
dmaCopy(@TextBackgroundsTiles, bgGetGfxPtr(bg), sizeof(TextBackgroundsTiles));
dmaCopy(@TextBackgroundsPal, BG_PALETTE, sizeof(TextBackgroundsPal));
map := pcuint16(bgGetMapPtr(bg));
bgSetControlBits(bg, BG_WRAP_ON);
for iy := 0 to 23 do
dmaCopy(@Layer512x256Map[iy * 64], @map[iy * 64], 32*2);
while (keys and KEY_B) = 0 do
begin
scanKeys();
keys := keysHeld();
swiWaitForVBlank();
if (keys and KEY_LEFT) <> 0 then
begin
offset := scroll_x div 8 - 1;
for iy := 0 to 23 do
map[(offset and 63) + (iy * 64)] := Layer512x256Map[(offset and 63) + (iy * 64)] ;
dec(scroll_x);
end;
if (keys and KEY_RIGHT) <> 0 then
begin
offset := scroll_x div 8 + 32;
for iy := 0 to 23 do
map[(offset and 63) + (iy * 64)] := Layer512x256Map[(offset and 63) + (iy * 64)] ;
inc(scroll_x);
end;
bgSetScroll(bg, scroll_x, 0);
bgUpdate();
end;
end;
//scrolls a 1024 by 1024 map on a 512x512 layer
procedure scroll4wayText();
var
scroll_x: integer = 0;
scroll_y: integer = 0;
bg: cint;
bgTileMap, bgLeftHalf, bgRightHalf: pcuint16;
ix, iy: integer;
keys: integer = 0;
offset_x: integer = 0;
offset_y: integer = 0;
movingHorizontal: boolean = false;
movingVertical: boolean = false;
bgTemp: pcuint16;
const
tileWidth : integer = 8; //width of a tile in pixels
mapWidth : integer = 1024 div 8; //width of the big map in tiles
mapHeight : integer = 1024 div 8; //heigh of the big map in tiles
bgWidth : integer = 256 div 8; //width of the hardware map in tiles
bgHeight : integer = 256 div 8; //height of the hardware map in tiles
screenWidth : integer = 256 div 8; //screen width in tiles
screenHeight: integer = 192 div 8; //screen height in tiles
begin
videoSetMode(MODE_0_2D);
vramSetBankA(VRAM_A_MAIN_BG);
bg := bgInit(3, BgType_Text8bpp, BgSize_T_512x256, 0,1);
dmaCopy(@TextBackgroundsTiles, bgGetGfxPtr(bg), sizeof(TextBackgroundsTiles));
dmaCopy(@TextBackgroundsPal, BG_PALETTE, sizeof(TextBackgroundsPal));
bgTileMap := pcuint16(bgGetMapPtr(bg));
bgLeftHalf := bgTileMap;
bgRightHalf := bgTileMap + 32 * 32;
for iy := 0 to screenHeight - 1 do
dmaCopy(@Layer1024x1024Map[iy * mapWidth], @bgTileMap[iy * bgWidth], screenWidth * 2);
while (keys and KEY_B) = 0 do
begin
movingHorizontal := false;
movingVertical := false;
scanKeys();
keys := keysHeld();
swiWaitForVBlank();
if (keys and KEY_LEFT) <> 0 then
begin
offset_x := scroll_x div 8 - 1;
dec(scroll_x);
if(scroll_x < 0) then
scroll_x := 0
else
movingHorizontal := true;
end else
if (keys and KEY_RIGHT) <> 0 then
begin
offset_x := scroll_x div 8 + screenWidth;
inc(scroll_x);
if (scroll_x >= (mapWidth - screenWidth) * tileWidth) then
scroll_x := (mapWidth - screenWidth) * tileWidth - 1
else
movingHorizontal := true;
end;
if (keys and KEY_UP) <> 0 then
begin
offset_y := scroll_y div 8 - 1;
dec(scroll_y);
if(scroll_y < 0) then
scroll_y := 0
else
movingVertical := true;
end else
if (keys and KEY_DOWN) <> 0 then
begin
offset_y := scroll_y div 8 + screenHeight;
inc(scroll_y);
if(scroll_y >= (mapHeight - screenHeight) * tileWidth) then
scroll_y := (mapHeight - screenHeight) * tileWidth - 1
else
movingVertical := true;
end;
if (movingHorizontal) then
begin
if (offset_x and 63) >= bgWidth then
bgTemp := bgRightHalf
else
bgTemp := bgLeftHalf;
for iy := scroll_y div 8 - 1 to scroll_y div 8 + screenHeight do
bgTemp[(offset_x and (bgWidth - 1)) + (iy and (bgHeight - 1)) * 32] := Layer1024x1024Map[offset_x + iy * mapWidth];
end;
if (movingVertical) then
begin
for ix := scroll_x div 8 - 1 to scroll_x div 8 + screenWidth do
begin
if ((ix and 63) >= bgWidth) then
bgTemp := bgRightHalf
else
bgTemp := bgLeftHalf;
bgTemp[(ix and (bgWidth - 1)) + (offset_y and (bgHeight - 1))* 32] := Layer1024x1024Map[ix + offset_y * mapWidth];
end;
end;
bgSetScroll(bg, scroll_x, scroll_y);
bgUpdate();
end;
end;
procedure scroll4wayExRotation();
var
scroll_x: integer = 0;
scroll_y: integer = 0;
bgTileMap: pcuint16;
iy, ix: integer;
keys: integer = 0;
offset_x: integer = 0;
offset_y: integer = 0;
movingHorizontal: boolean = false;
movingVertical: boolean = false;
bg: cint;
const
tileWidth : integer = 8;
mapWidth : integer = 1024 div 8;
mapHeight : integer = 1024 div 8;
bgWidth : integer = 512 div 8;
bgHeight : integer = 512 div 8;
screenWidth : integer = 256 div 8;
screenHeight: integer = 192 div 8;
begin
videoSetMode(MODE_5_2D);
vramSetBankA(VRAM_A_MAIN_BG);
bg := bgInit(3, BgType_ExRotation, BgSize_ER_512x512, 0,1);
dmaCopy(@TextBackgroundsTiles, bgGetGfxPtr(bg), sizeof(TextBackgroundsTiles));
dmaCopy(@TextBackgroundsPal, BG_PALETTE, sizeof(TextBackgroundsPal));
bgTileMap := pcuint16(bgGetMapPtr(bg));
bgSetControlBits(bg, BG_WRAP_ON);
for iy := 0 to screenHeight - 1 do
dmaCopy(@Layer1024x1024Map[iy * mapWidth], @bgTileMap[iy * bgWidth], screenWidth * 2);
while (keys and KEY_B) = 0 do
begin
movingHorizontal := false;
movingVertical := false;
scanKeys();
keys := keysHeld();
swiWaitForVBlank();
if (keys and KEY_LEFT) <> 0 then
begin
offset_x := scroll_x div 8 - 1;
dec(scroll_x);
if(scroll_x < 0) then
scroll_x := 0
else
movingHorizontal := true;
end else
if (keys and KEY_RIGHT) <> 0 then
begin
offset_x := scroll_x div 8 + screenWidth;
inc(scroll_x);
if (scroll_x >= (mapWidth - screenWidth) * tileWidth) then
scroll_x := (mapWidth - screenWidth) * tileWidth - 1
else
movingHorizontal := true;
end;
if (keys and KEY_UP) <> 0 then
begin
offset_y := scroll_y div 8 - 1;
dec(scroll_y);
if(scroll_y < 0) then
scroll_y := 0
else
movingVertical := true;
end else
if(keys and KEY_DOWN) <> 0 then
begin
offset_y := scroll_y div 8 + screenHeight;
inc(scroll_y);
if(scroll_y >= (mapHeight - screenHeight) * tileWidth) then
scroll_y := (mapHeight - screenHeight) * tileWidth - 1
else
movingVertical := true;
end;
if (movingHorizontal) then
begin
for iy := scroll_y div 8 - 1 to scroll_y div 8 + screenHeight do
bgTileMap[(offset_x and (bgWidth - 1)) + (iy and (bgHeight - 1)) * bgWidth] := Layer1024x1024Map[offset_x + iy * mapWidth];
end;
if (movingVertical) then
begin
for ix := scroll_x div 8 - 1 to scroll_x div 8 + screenWidth do
bgTileMap[(ix and (bgWidth - 1)) + (offset_y and (bgHeight - 1))* bgWidth] := Layer1024x1024Map[ix + offset_y * mapWidth];
end;
bgSetScroll(bg, scroll_x, scroll_y);
bgUpdate();
end;
end;
end.
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