SpritesMind.Net

Code: Select all

#include <genesis.h>

int main()
{
    SYS_disableInts();

    VDP_setScreenWidth320();
    VDP_setScreenHeight224();

    SYS_enableInts();

    while (TRUE)
    {
        VDP_showFPS(TRUE);
        for (int y = 0; y < 28; y++) {
            for (int x = 0; x < 40; x++) {
                u16 tileIndex = random() % 16;
                VDP_setTileMapXY(PLAN_B, TILE_ATTR_FULL(PAL1, FALSE, FALSE, FALSE, tileIndex), x, y);
            }
        }
        VDP_waitVSync();
    }

    return 0;
}

Code: Select all

    u16 tiles[40 * 28];
    while (TRUE)
    {
        VDP_showFPS(TRUE);
        for (int i = 0; i < 28 * 40; i++) {
            tiles[i] = TILE_ATTR_FULL(PAL1, FALSE, FALSE, FALSE, random() % 16);
        }
        VDP_setTileMapDataRect(PLAN_B, tiles, 0,0, 40,28);
        VDP_waitVSync();
    }

Code: Select all

    u16 tiles[28][40];
    while (TRUE)
    {
        VDP_showFPS(TRUE);
        for (int y = 0; y < 28; y++) {
            for (int x = 0; x < 40; x++) {
                tiles[y][x] = TILE_ATTR_FULL(PAL1, FALSE, FALSE, FALSE, random() % 16);
            }
            VDP_setTileMapData(VDP_PLAN_B, tiles[y], y * 64, 40, DMA_QUEUE);
        }
        VDP_waitVSync();
    }

Code: Select all

static u16 rand();
static u16 seed = 0xB6CE;

int main()
{
    u16 tiles[64*28];

    while (TRUE)
    {
        u16 x, y;
        u16* dst;

        VDP_showFPS(FALSE);

        dst = tiles;
        for(y = 0; y < 28; y++)
        {
            for(x = 0; x < 40; x++)
                *dst++ = TILE_ATTR_FULL(PAL1, FALSE, FALSE, FALSE, rand() & 0xF);

            // bypass unused map area
            dst += 64-40;
        }

        // single DMA
        VDP_setTileMapData(VDP_PLAN_B, tiles, 0, 64*28, DMA_QUEUE);

        VDP_waitVSync();
    }

    return 0;
}

static u16 rand()
{
    seed = (seed << 1) ^ GET_HVCOUNTER;

    return seed;
}