graphics/Effects/HDMAGradient/HDMAGradient.c

/*---------------------------------------------------------------------------------
 
 
    Simple tile mode 3 demo with more than 32k tiles
    -- alekmaul
 
 
---------------------------------------------------------------------------------*/
#include <snes.h>
 
extern char patterns, patterns1;
extern char palette;
extern char map, map_end;
 
//---------------------------------------------------------------------------------
int main(void)
{
    unsigned short pad0, pad1 = 0;
    unsigned char gradient = 15;
 
    // Read tiles to VRAM in 2 phases because we are more than 32k
    bgInitTileSet(0, &patterns, &palette, 0, 0x8000, 256 * 2, BG_256COLORS, 0x1000);
    dmaCopyVram(&patterns1, 0x5000, 0x6000);
 
    // Copy Map to VRAM
    bgInitMapSet(0, &map, (&map_end - &map), SC_32x32, 0x0000);
 
    // Now Put in 256 color mode and disable other BGs except 1st one
    setMode(BG_MODE3, 0);
    bgSetDisable(1);
    setScreenOn();
 
    // Wait for key to change gradient
    while (1)
    {
        // Update gradient if A pressed
        if (padsDown(0) & KEY_A)
        {
            setModeHdmaGradient(gradient);
            gradient = (gradient - 1) & 15;
            if (gradient == 1)
                gradient = 15;
        }
        WaitForVBlank();
    }
    return 0;
}