nuclear@1: #include "hwregs.h"
nuclear@1: #include "intr.h"
nuclear@1: #include "copper.h"
nuclear@3: #include "rng.h"
nuclear@1: 
nuclear@1: #define BPLSZ  (320 / 8 * 256)
nuclear@1: static unsigned char fb0[BPLSZ];
nuclear@1: 
nuclear@2: extern uint16_t dbgval;
nuclear@2: 
nuclear@2: #define wait_vpos(x) \
nuclear@2: 	asm volatile ( \
nuclear@2: 		"0: move.l 0xdff004, %%d0\n\t" \
nuclear@2: 		"and.l #0x1ff00, %%d0\n\t" \
nuclear@2: 		"cmp.l %0, %%d0\n\t" \
nuclear@2: 		"bne 0b\n\t" \
nuclear@2: 		:: "i"((x) << 8) : "%d0")
nuclear@2: 
nuclear@2: #define wait_vblank() wait_vpos(300)
nuclear@2: #define wait_scanline(x) wait_vpos((x) + 0x2c)
nuclear@2: 
nuclear@2: #define clear_bpl(p) \
nuclear@2: 	asm volatile ( \
nuclear@2: 		"move.l %0, %%a0\n\t" \
nuclear@2: 		"move.l %1, %%d0\n\t" \
nuclear@2: 		"0: clr.l (%%a0)+\n\t" \
nuclear@2: 		"dbra %%d0, 0b\n\t" \
nuclear@2: 		:: "a"(p), "i"(BPLSZ / 4 - 1) \
nuclear@2: 		: "a0", "d0")
nuclear@2: 
nuclear@2: static uint32_t coplist[] = {
nuclear@2: 	COPPER_MOVE(REGN_BPL1PTH, 0),
nuclear@2: 	COPPER_MOVE(REGN_BPL1PTL, 0),
nuclear@3: 
nuclear@3: 	COPPER_MOVE(REGN_COLOR0, 0x234),
nuclear@3: 	COPPER_VWAIT(15),
nuclear@3: 	COPPER_MOVE(REGN_COLOR0, 0x012),
nuclear@3: 	COPPER_VWAIT(20),
nuclear@3: 	COPPER_MOVE(REGN_COLOR0, 0x235),
nuclear@3: 
nuclear@3: 	COPPER_OVERFLOW,
nuclear@3: 
nuclear@3: 	COPPER_VWAIT(220),
nuclear@3: 	COPPER_MOVE(REGN_COLOR0, 0x346),
nuclear@3: 	COPPER_VWAIT(225),
nuclear@3: 	COPPER_MOVE(REGN_COLOR0, 0x234),
nuclear@3: 
nuclear@2: 	COPPER_END
nuclear@2: };
nuclear@2: 
nuclear@1: int main(void)
nuclear@1: {
nuclear@3: 	int32_t x = 0, y = 0;
nuclear@3: 
nuclear@1: 	REG_INTENA = SETBITS(INTEN_VERTB | INTEN_MASTER);
nuclear@1: 
nuclear@1: 	REG_DMACON = CLRBITS(DMA_ALL);
nuclear@2: 	REG_BPLCON0 = BPLCON0_COUNT(1) | BPLCON0_COLOR;
nuclear@1: 	REG_BPLCON1 = 0;
nuclear@1: 	REG_DIWSTART = 0x2981;
nuclear@1: 	REG_DIWSTOP = 0x29c1;
nuclear@1: 	REG_DDFSTART = 0x38;
nuclear@1: 	REG_DDFSTOP = 0xd0;
nuclear@1: 
nuclear@3: 	REG_COLOR0 = 0x235;
nuclear@3: 	REG_COLOR1 = 0x2f5;
nuclear@1: 
nuclear@1: 	wait_vblank();
nuclear@2: 	coplist[0] = COPPER_MOVE(REGN_BPL1PTH, (uint32_t)fb0 >> 16);
nuclear@2: 	coplist[1] = COPPER_MOVE(REGN_BPL1PTL, (uint32_t)fb0);
nuclear@2: 	REG32_COP1LC = (uint32_t)coplist;
nuclear@2: 	REG_COPJMP1 = 0;
nuclear@1: 
nuclear@2: 	REG_DMACON = SETBITS(DMA_BPL | DMA_COPPER | DMA_MASTER);
nuclear@1: 
nuclear@3: 	srand(0);
nuclear@3: 
nuclear@3: #define CDF0	655
nuclear@3: #define CDF1	56361
nuclear@3: #define CDF2	60948
nuclear@3: 
nuclear@2: 	for(;;) {
nuclear@3: 		int sel = rand() & 0xffff;
nuclear@3: 		int32_t px, py;
nuclear@3: 		unsigned char *pptr;
nuclear@3: 
nuclear@3: 		if(sel < CDF0) {
nuclear@3: 			x = 0;
nuclear@3: 			y = (y >> 8) * (10486 >> 8);
nuclear@3: 		} else if(sel < CDF1) {
nuclear@3: 			int32_t nx = (x >> 8) * (55705 >> 8) + (y >> 8) * (2621 >> 8);
nuclear@3: 			y = (y >> 8) * (55705 >> 8) - (x >> 8) * (2621 >> 8) + 104857;
nuclear@3: 			x = nx;
nuclear@3: 		} else if(sel < CDF2) {
nuclear@3: 			int32_t nx = (x >> 8) * (13107 >> 8) - (y >> 8) * (17039 >> 8);
nuclear@3: 			y = (x >> 8) * (15073 >> 8) + (y >> 8) * (14417 >> 8) + 104857;
nuclear@3: 			x = nx;
nuclear@3: 		} else {
nuclear@3: 			int32_t nx = (y >> 8) * (18350 >> 8) - (x >> 8) * (9830 >> 8);
nuclear@3: 			y = (x >> 8) * (17039 >> 8) + (y >> 8) * (15728 >> 8) + 28835;
nuclear@3: 			x = nx;
nuclear@3: 		}
nuclear@3: 
nuclear@3: 		px = (y >> 11);
nuclear@3: 		py = 128 - (x >> 11);
nuclear@3: 
nuclear@3: 		if(py >= 0) {
nuclear@3: 			pptr = fb0 + (py * 320 + px) / 8;
nuclear@3: 			*pptr = *pptr | (0x80 >> (px & 7));
nuclear@3: 		}
nuclear@3: 
nuclear@2: 		wait_vblank();
nuclear@2: 	}
nuclear@1: 
nuclear@1: 	return 0;
nuclear@1: }