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;

;

; Z buffer: 16 bits Z / 16 bits color

;

;

;include 'zbuffer.inc'

;output:

; eax - указатель на ZBuffer (0 если не удача)

align 16

proc ZB_open uses ecx edi, xsize:dword, ysize:dword, mode:dword,\

		nb_colors:dword, color_indexes:dword, color_table:dword, frame_buffer:dword

	stdcall gl_malloc, sizeof.ZBuffer

	cmp eax,0

	jne @f

		stdcall dbg_print,f_zb_opn,err_1

		jmp .end_f

	@@:

	mov edi,eax

	mov eax,[ysize]

	mov [edi+offs_zbuf_ysize],eax

	mov eax,[xsize]

	mov [edi+offs_zbuf_xsize],eax

	imul eax,PSZB

	add eax,3

	and eax,not 3

	mov [edi+offs_zbuf_linesize],eax

	mov eax,[mode]

	mov [edi+offs_zbuf_mode],eax

if TGL_FEATURE_32_BITS eq 1

	cmp eax,ZB_MODE_RGBA

	je .correct

end if

if TGL_FEATURE_24_BITS eq 1

	cmp eax,ZB_MODE_RGB24

	je .correct

end if

	cmp eax,ZB_MODE_5R6G5B

	jne @f

	.correct:

		mov dword[edi+offs_zbuf_nb_colors],0

		jmp .end_s

	@@: ;default:

		stdcall dbg_print,f_zb_opn,err_3

		jmp .error

	.end_s:

	mov ecx,[edi+offs_zbuf_xsize]

	imul ecx,[edi+offs_zbuf_ysize]

	shl ecx,1 ;*= sizeof(unsigned short)

	stdcall gl_malloc, ecx

	mov [edi+offs_zbuf_zbuf],eax

	cmp eax,0

	jne @f

		stdcall dbg_print,f_zb_opn,err_2

		jmp .error

	@@:

	mov dword[edi+offs_zbuf_frame_buffer_allocated],0

	mov dword[edi+offs_zbuf_pbuf],0 ;NULL

	mov dword[edi+offs_zbuf_current_texture],0 ;NULL

	mov eax,edi

	jmp .end_f

	.error:

		stdcall gl_free,edi

		xor eax,eax

	.end_f:

	ret

endp

;void ZB_close(ZBuffer * zb)

;{

;    if (zb->frame_buffer_allocated)

;	gl_free(zb->pbuf);

;    gl_free(zb->zbuf);

;    gl_free(zb);

;}

align 16

proc ZB_resize uses eax ebx ecx edi esi, zb:dword, frame_buffer:dword, xsize:dword, ysize:dword

	mov ebx,[zb]

	; xsize must be a multiple of 4

	mov edi,[xsize]

	and edi,not 3

	mov esi,[ysize]

	mov [ebx+offs_zbuf_xsize], edi

	mov [ebx+offs_zbuf_ysize], esi

	mov eax,edi

	imul eax,PSZB

	add eax,3

	and eax,not 3

	mov [ebx+offs_zbuf_linesize],eax ;zb.linesize = (xsize * PSZB + 3) & ~3

	mov ecx,edi

	imul ecx,esi

	shl ecx,1 ;*= sizeof(unsigned short)

	stdcall gl_free,dword[ebx+offs_zbuf_zbuf]

	stdcall gl_malloc,ecx

	mov [ebx+offs_zbuf_zbuf],eax

	cmp dword[ebx+offs_zbuf_frame_buffer_allocated],0

	je @f

		stdcall gl_free,dword[ebx+offs_zbuf_pbuf]

	@@:

	cmp dword[frame_buffer],0

	jne .els_0

		inc esi

		imul esi,dword[ebx+offs_zbuf_linesize]

		stdcall gl_malloc,esi

		mov dword[ebx+offs_zbuf_pbuf],eax

		mov dword[ebx+offs_zbuf_frame_buffer_allocated],1

		jmp @f

	.els_0:

		mov eax,[frame_buffer]

		mov dword[ebx+offs_zbuf_pbuf],eax

		mov dword[ebx+offs_zbuf_frame_buffer_allocated],0

	@@:

	ret

endp

;static void ZB_copyBuffer(ZBuffer * zb,

;                          void *buf,

;                          int linesize)

;{

;    unsigned char *p1;

;    PIXEL *q;

;    int y, n;

;    q = zb->pbuf;

;    p1 = buf;

;    n = zb->xsize * PSZB;

;    for (y = 0; y < zb->ysize; y++) {

;	memcpy(p1, q, n);

;	p1 += linesize;

;	q = (PIXEL *) ((char *) q + zb->linesize);

;    }

;}

;#if TGL_FEATURE_RENDER_BITS == 16

;/* 32 bpp copy */

;#ifdef TGL_FEATURE_32_BITS

;#define RGB16_TO_RGB32(p0,p1,v)\

;{\

;    unsigned int g,b,gb;\

;    g = (v & 0x07E007E0) << 5;\

;    b = (v & 0x001F001F) << 3;\

;    gb = g | b;\

;    p0 = (gb & 0x0000FFFF) | ((v & 0x0000F800) << 8);\

;    p1 = (gb >> 16) | ((v & 0xF8000000) >> 8);\

;}

;static void ZB_copyFrameBufferRGB32(ZBuffer * zb,

;                                    void *buf,

;                                    int linesize)

;{

;    unsigned short *q;

;    unsigned int *p, *p1, v, w0, w1;

;    int y, n;

;    q = zb->pbuf;

;    p1 = (unsigned int *) buf;

;    for (y = 0; y < zb->ysize; y++) {

;	p = p1;

;	n = zb->xsize >> 2;

;	do {

;	    v = *(unsigned int *) q;

;#if BYTE_ORDER == BIG_ENDIAN

;	    RGB16_TO_RGB32(w1, w0, v);

;#else

;	    RGB16_TO_RGB32(w0, w1, v);

;#endif

;	    p[0] = w0;

;	    p[1] = w1;

;	    v = *(unsigned int *) (q + 2);

;#if BYTE_ORDER == BIG_ENDIAN

;	    RGB16_TO_RGB32(w1, w0, v);

;#else

;	    RGB16_TO_RGB32(w0, w1, v);

;#endif

;	    p[2] = w0;

;	    p[3] = w1;

;	    q += 4;

;	    p += 4;

;	} while (--n > 0);

;	p1 += linesize;

;    }

;}

;#endif

;/* 24 bit packed pixel handling */

;#ifdef TGL_FEATURE_24_BITS

;/* order: RGBR GBRG BRGB */

;/* XXX: packed pixel 24 bit support not tested */

;/* XXX: big endian case not optimised */

;#if BYTE_ORDER == BIG_ENDIAN

;#define RGB16_TO_RGB24(p0,p1,p2,v1,v2)\

;{\

;    unsigned int r1,g1,b1,gb1,g2,b2,gb2;\

;    v1 = (v1 << 16) | (v1 >> 16);\

;    v2 = (v2 << 16) | (v2 >> 16);\

;    r1 = (v1 & 0xF800F800);\

;    g1 = (v1 & 0x07E007E0) << 5;\

;    b1 = (v1 & 0x001F001F) << 3;\

;    gb1 = g1 | b1;\

;    p0 = ((gb1 & 0x0000FFFF) << 8) | (r1 << 16) | (r1 >> 24);\

;    g2 = (v2 & 0x07E007E0) << 5;\

;    b2 = (v2 & 0x001F001F) << 3;\

;    gb2 = g2 | b2;\

;    p1 = (gb1 & 0xFFFF0000) | (v2 & 0xF800) | ((gb2 >> 8) & 0xff);\

;    p2 = (gb2 << 24) | ((v2 & 0xF8000000) >> 8) | (gb2 >> 16);\

;}

;#else

;#define RGB16_TO_RGB24(p0,p1,p2,v1,v2)\

;{\

;    unsigned int r1,g1,b1,gb1,g2,b2,gb2;\

;    r1 = (v1 & 0xF800F800);\

;    g1 = (v1 & 0x07E007E0) << 5;\

;    b1 = (v1 & 0x001F001F) << 3;\

;    gb1 = g1 | b1;\

;    p0 = ((gb1 & 0x0000FFFF) << 8) | (r1 << 16) | (r1 >> 24);\

;    g2 = (v2 & 0x07E007E0) << 5;\

;    b2 = (v2 & 0x001F001F) << 3;\

;    gb2 = g2 | b2;\

;    p1 = (gb1 & 0xFFFF0000) | (v2 & 0xF800) | ((gb2 >> 8) & 0xff);\

;    p2 = (gb2 << 24) | ((v2 & 0xF8000000) >> 8) | (gb2 >> 16);\

;}

;#endif

;static void ZB_copyFrameBufferRGB24(ZBuffer * zb,

;                                    void *buf, int linesize)

;{

;    unsigned short *q;

;    unsigned int *p, *p1, w0, w1, w2, v0, v1;

;    int y, n;

;    q = zb->pbuf;

;    p1 = (unsigned int *) buf;

;    linesize = linesize * 3;

;    for (y = 0; y < zb->ysize; y++) {

;	p = p1;

;	n = zb->xsize >> 2;

;	do {

;	    v0 = *(unsigned int *) q;

;	    v1 = *(unsigned int *) (q + 2);

;	    RGB16_TO_RGB24(w0, w1, w2, v0, v1);

;	    p[0] = w0;

;	    p[1] = w1;

;	    p[2] = w2;

;	    q += 4;

;	    p += 3;

;	} while (--n > 0);

;

;	(char *) p1 += linesize;

;    }

;}

;#endif

;void ZB_copyFrameBuffer(ZBuffer * zb, void *buf,

;			int linesize)

;{

;    switch (zb->mode) {

;#ifdef TGL_FEATURE_32_BITS

;    case ZB_MODE_RGBA:

;	ZB_copyFrameBufferRGB32(zb, buf, linesize >> 1);

;	break;

;#endif

;#ifdef TGL_FEATURE_24_BITS

;    case ZB_MODE_RGB24:

;	ZB_copyFrameBufferRGB24(zb, buf, linesize >> 1);

;	break;

;#endif

;    default:

;	assert(0);

;    }

;}

;#endif /* TGL_FEATURE_RENDER_BITS == 16 */

;#if TGL_FEATURE_RENDER_BITS == 24

;#define RGB24_TO_RGB16(r, g, b) \

;  ((((r) >> 3) << 11) | (((g) >> 2) << 5) | ((b) >> 3))

;/* XXX: not optimized */

;static void ZB_copyFrameBuffer5R6G5B(ZBuffer * zb,

;                                     void *buf, int linesize)

;{

;    PIXEL *q;

;    unsigned short *p, *p1;

;    int y, n;

;    q = zb->pbuf;

;    p1 = (unsigned short *) buf;

;    for (y = 0; y < zb->ysize; y++) {

;	p = p1;

;	n = zb->xsize >> 2;

;	do {

;            p[0] = RGB24_TO_RGB16(q[0], q[1], q[2]);

;            p[1] = RGB24_TO_RGB16(q[3], q[4], q[5]);

;            p[2] = RGB24_TO_RGB16(q[6], q[7], q[8]);

;            p[3] = RGB24_TO_RGB16(q[9], q[10], q[11]);

;	    q = (PIXEL *)((char *)q + 4 * PSZB);

;	    p += 4;

;	} while (--n > 0);

;	p1 = (unsigned short *)((char *)p1 + linesize);

;    }

;}

;void ZB_copyFrameBuffer(ZBuffer * zb, void *buf,

;			int linesize)

;{

;    switch (zb->mode) {

;#ifdef TGL_FEATURE_24_BITS

;    case ZB_MODE_RGB24:

;	ZB_copyBuffer(zb, buf, linesize);

;	break;

;#endif

;    default:

;	assert(0);

;    }

;}

;#endif /* TGL_FEATURE_RENDER_BITS == 24 */

;#if TGL_FEATURE_RENDER_BITS == 32

;#define RGB32_TO_RGB16(v) \

;  (((v >> 8) & 0xf800) | (((v) >> 5) & 0x07e0) | (((v) & 0xff) >> 3))

;/* XXX: not optimized */

;static void ZB_copyFrameBuffer5R6G5B(ZBuffer * zb,

;                                     void *buf, int linesize)

;{

;    PIXEL *q;

;    unsigned short *p, *p1;

;    int y, n;

;    q = zb->pbuf;

;    p1 = (unsigned short *) buf;

;    for (y = 0; y < zb->ysize; y++) {

;	p = p1;

;	n = zb->xsize >> 2;

;	do {

;            p[0] = RGB32_TO_RGB16(q[0]);

;            p[1] = RGB32_TO_RGB16(q[1]);

;            p[2] = RGB32_TO_RGB16(q[2]);

;            p[3] = RGB32_TO_RGB16(q[3]);

;	    q += 4;

;	    p += 4;

;	} while (--n > 0);

;	p1 = (unsigned short *)((char *)p1 + linesize);

;    }

;}

;void ZB_copyFrameBuffer(ZBuffer * zb, void *buf,

;			int linesize)

;{

;    switch (zb->mode) {

;#ifdef TGL_FEATURE_32_BITS

;    case ZB_MODE_RGBA:

;	ZB_copyBuffer(zb, buf, linesize);

;	break;

;#endif

;    default:

;	assert(0);

;    }

;}

;#endif /* TGL_FEATURE_RENDER_BITS == 32 */

;

; adr must be aligned on an 'int'

;

;destroy:

; ecx, edi

align 16

proc memset_s uses eax, adr:dword, val:dword, count:dword

	mov eax,[val]

	mov di,ax

	ror eax,16

	mov ax,di

	mov ecx,[count]

	shr ecx,1

	mov edi,[adr]

	rep stosd

	bt dword[count],0

	jnc @f

		stosw

	@@:

	ret

endp

align 16

proc memset_l uses eax ecx edi, adr:dword, val:dword, count:dword

	mov eax,[val]

	mov ecx,[count]

	mov edi,[adr]

	rep stosd

	ret

endp

; count must be a multiple of 4 and >= 4

;destroy:

; edi, esi

align 16

proc memset_RGB24 uses eax ecx, adr:dword, r:dword, g:dword, b:dword, count:dword

	mov esi,[adr]

	mov eax,[r] ;копируем в буфер первые 12 байт (минимальное число кратное 3 и 4)

	mov byte[esi],al

	mov byte[esi+3],al

	mov byte[esi+6],al

	mov byte[esi+9],al

	mov eax,[g]

	mov byte[esi+1],al

	mov byte[esi+4],al

	mov byte[esi+7],al

	mov byte[esi+10],al

	mov eax,[b]

	mov byte[esi+2],al

	mov byte[esi+5],al

	mov byte[esi+8],al

	mov byte[esi+11],al

	mov ecx,[count]

	shr ecx,2

	cmp ecx,1

	jle .end_f ;если ширина буфера меньше 12 байт, то выходим

	dec ecx

	mov edi,esi

	add edi,12

	mov eax,[esi]

	cmp eax,[esi+4]

	jne @f

		;если r=g и g=b и b=r

		mov esi,ecx

		shl ecx,2

		sub ecx,esi ;ecx*=3

		rep stosd

		jmp .end_f

align 16

	@@: ;если r!=g или g!=b или b!=r

		movsd

		movsd

		movsd

		sub esi,12

	loop @b

	.end_f:

	ret

endp

align 16

proc ZB_clear uses eax ebx ecx edi esi, zb:dword, clear_z:dword, z:dword,\

	clear_color:dword, r:dword, g:dword, b:dword

;if TGL_FEATURE_RENDER_BITS != 24

;	color dd ?

;end if

	mov eax,[zb]

	cmp dword[clear_z],0

	je @f

		mov ebx,[eax+offs_zbuf_xsize]

		imul ebx,[eax+offs_zbuf_ysize]

		stdcall memset_s, [eax+offs_zbuf_zbuf],[z],ebx

	@@:

	cmp dword[clear_color],0

	je @f

if TGL_FEATURE_RENDER_BITS eq 24

		mov ebx,[eax+offs_zbuf_xsize]

		push ebx

		mov ebx,[b]

		shr ebx,8

		push ebx

		mov ebx,[g]

		shr ebx,8

		push ebx

		mov ebx,[r]

		shr ebx,8

		push ebx

		add esp,16

end if

		mov ebx,[eax+offs_zbuf_pbuf]

		mov ecx,[eax+offs_zbuf_ysize]

align 4

		.cycle_0:

if TGL_FEATURE_RENDER_BITS eq 32

			;color = RGB_TO_PIXEL(r, g, b)

			;memset_l(ebx, color, zb->xsize)

end if

if TGL_FEATURE_RENDER_BITS eq 24

			sub esp,16

			stdcall memset_RGB24,ebx

end if

			add ebx,[eax+offs_zbuf_linesize]

		loop .cycle_0

	@@:

	ret

endp