graphics/Backgrounds/Mode7LZ77/src/Mode7LZ77.c

/*---------------------------------------------------------------------------------
 
 
    Simple mode 7 rotating demo with rotation and scaling
    Without compression : 7 Ko (7168 bytes)
       With compression : 2,6 Ko (2664 bytes)
    -- alekmaul
---------------------------------------------------------------------------------*/
#include <snes.h>
 
#include "mode7bg.inc"
 
u16 pad0;
u8 angle;
u16 zscale;
extern u16 m7sx, m7sy;
 
//---------------------------------------------------------------------------------
int main(void)
{
    // Read tiles & map to VRAM  (interlace for mode 7)
    bgInitMapTileSet7lz(&mode7bg_til, &mode7bg_map, &mode7bg_pal, (&mode7bg_tilend - &mode7bg_til), 0x0000);
 
    // Now Put mode7 without anything else
    setMode7(0);
 
    // Display screen
    setScreenOn();
 
    // Init angle
    angle = 0; zscale=0x200; // default value stored in PVSnesLib for m7sx & m7sy
    setMode7Rot(angle);
 
    // Wait for nothing :P
    while (1)
    {
        // Get current #0 pad
        pad0 = padsCurrent(0);
        if (pad0)
        {
            switch (pad0)
            {
            // Update rotation with A & B
            case KEY_A:
                angle++;
                setMode7Rot(angle);
                break;
            case KEY_B:
                angle--;
                setMode7Rot(angle);
                break;
            case KEY_DOWN:
                if (zscale>16) zscale-=16; 
                m7sx=zscale; m7sy=zscale; setMode7Rot(angle);// as we also modify angle, we use this trick instead of calling setMode7Scale(zscale,zscale);
                break;
            case KEY_UP:
                if (zscale<0xF00) zscale+=16; 
                m7sx=zscale; m7sy=zscale; setMode7Rot(angle); // as we also modify angle, we use this trick instead of calling  setMode7Scale(zscale,zscale);
                break;
            }
        }
        WaitForVBlank();
    }
    return 0;
}