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program SpriteRotate;
{$mode objfpc}
uses
ctypes, nds9;
var
i: integer;
angle: integer = 0;
gfx: pcuint16;
begin
videoSetMode(MODE_0_2D);
vramSetBankA(VRAM_A_MAIN_SPRITE);
oamInit(oamMain, SpriteMapping_1D_32, false);
gfx := oamAllocateGfx(oamMain, SpriteSize_32x32, SpriteColorFormat_256Color);
for i := 0 to (32 * 32 div 2) -1 do
gfx[i] := 1 or (1 shl 8);
SPRITE_PALETTE[1] := RGB15(31,0,0);
while true do
begin
scanKeys();
if (keysHeld() and KEY_LEFT) <> 0 then
angle := angle + degreesToAngle(2);
if (keysHeld() and KEY_RIGHT) <> 0 then
angle := angle - degreesToAngle(2);
//-------------------------------------------------------------------------
// Set the first rotation/scale matrix
//
// There are 32 rotation/scale matricies that can store sprite rotations
// Any number of sprites can share a sprite rotation matrix or each sprite
// (up to 32) can utilize a seperate rotation. Because this sprite is doubled
// in size we have to adjust its position by subtracting half of its height and
// width (20 - 16, 20 - 16, )
//-------------------------------------------------------------------------
oamRotateScale(oamMain, 0, angle, intToFixed(1, 8), intToFixed(1, 8));
oamSet(oamMain, //main graphics engine context
0, //oam index (0 to 127)
20 - 16, 20 - 16, //x and y pixle location of the sprite
0, //priority, lower renders last (on top)
0, //this is the palette index if multiple palettes or the alpha value if bmp sprite
SpriteSize_32x32,
SpriteColorFormat_256Color,
gfx, //pointer to the loaded graphics
0, //sprite rotation/scale matrix index
true, //double the size when rotating?
false, //hide the sprite?
false, false, //vflip, hflip
false //apply mosaic
);
//-------------------------------------------------------------------------
// Because the sprite below has size double set to false it can never be larger than
// 32x32 causing it to clip as it rotates.
//-------------------------------------------------------------------------
oamSet(oamMain, //main graphics engine context
1, //oam index (0 to 127)
204, 20, //x and y pixle location of the sprite
0, //priority, lower renders last (on top)
0, //this is the palette index if multiple palettes or the alpha value if bmp sprite
SpriteSize_32x32,
SpriteColorFormat_256Color,
gfx, //pointer to the loaded graphics
0, //sprite rotation/scale matrix index
false, //double the size when rotating?
false, //hide the sprite?
false, false, //vflip, hflip
false //apply mosaic
);
swiWaitForVBlank();
oamUpdate(oamMain);
end;
end.
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