devilutionX/Source/_asm.cpp

static inline void asm_cel_light_edge(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src);
static inline void asm_cel_light_square(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src);
static inline void asm_trans_light_cel_0_2(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src);
static inline void asm_trans_light_edge_0_2(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src);
static inline void asm_trans_light_square_0_2(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src);
static inline void asm_trans_light_cel_1_3(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src);
static inline void asm_trans_light_edge_1_3(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src);
static inline void asm_trans_light_square_1_3(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src);
static inline unsigned int asm_trans_light_mask(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src, unsigned int mask);

static inline void asm_cel_light_edge(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src)
{
	unsigned char l = w >> 1;

	if (w & 1) {
		dst[0] = tbl[src[0]];
		src++;
		dst++;
	}
	if (l & 1) {
		dst[0] = tbl[src[0]];
		dst[1] = tbl[src[1]];
		src += 2;
		dst += 2;
	}

	asm_cel_light_square(l >> 1, tbl, dst, src);
}

static inline void asm_cel_light_square(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src)
{
	for (; w; --w) {
		dst[0] = tbl[src[0]];
		dst[1] = tbl[src[1]];
		dst[2] = tbl[src[2]];
		dst[3] = tbl[src[3]];
		src += 4;
		dst += 4;
	}
}

static inline void asm_trans_light_cel_0_2(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src)
{
	if (!(w & 1)) {
		asm_trans_light_edge_1_3(w >> 1, tbl, dst, src);
	} else {
		src++;
		dst++;
		asm_trans_light_edge_0_2(w >> 1, tbl, dst, src);
	}
}

static inline void asm_trans_light_edge_0_2(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src)
{
	unsigned char l = w >> 1;

	if (w & 1) {
		dst[0] = tbl[src[0]];
		src += 2;
		dst += 2;
	}
	if (l) {
		asm_trans_light_square_0_2(l, tbl, dst, src);
	}
}

static inline void asm_trans_light_square_0_2(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src)
{
	for (; w; --w) {
		dst[0] = tbl[src[0]];
		dst[2] = tbl[src[2]];
		src += 4;
		dst += 4;
	}
}

static inline void asm_trans_light_cel_1_3(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src)
{
	if (!(w & 1)) {
		asm_trans_light_edge_0_2(w >> 1, tbl, dst, src);
	} else {
		dst[0] = tbl[src[0]];
		src++;
		dst++;
		asm_trans_light_edge_1_3(w >> 1, tbl, dst, src);
	}
}

static inline void asm_trans_light_edge_1_3(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src)
{
	unsigned char l = w >> 1;

	if (w & 1) {
		dst[1] = tbl[src[1]];
		src += 2;
		dst += 2;
	}
	if (l) {
		asm_trans_light_square_1_3(l, tbl, dst, src);
	}
}

static inline void asm_trans_light_square_1_3(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src)
{
	for (; w; --w) {
		dst[1] = tbl[src[1]];
		dst[3] = tbl[src[3]];
		src += 4;
		dst += 4;
	}
}

static inline unsigned int asm_trans_light_mask(unsigned char w, BYTE *tbl, BYTE *&dst, BYTE *&src, unsigned int mask)
{
	for (; w; --w, src++, dst++, mask *= 2) {
		if (mask & 0x80000000)
			dst[0] = tbl[src[0]];
	}

	return mask;
}