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;

; Z buffer

;

include 'zfeatures.inc'

ZB_Z_BITS equ 16

ZB_POINT_Z_FRAC_BITS equ 14

ZB_POINT_TEXEL_SIZE equ 12 ;точность множителя для вычисления координат текселя

	;влияет на максимальный размер текстуры

ZB_POINT_RED_MIN equ (1 shl 8)

ZB_POINT_RED_MAX equ ( (1 shl 16)-1 )

ZB_POINT_GREEN_MIN equ (1 shl 8)

ZB_POINT_GREEN_MAX equ ( (1 shl 16)-1 )

ZB_POINT_BLUE_MIN equ (1 shl 8)

ZB_POINT_BLUE_MAX equ ( (1 shl 16)-1 )

; display modes

ZB_MODE_5R6G5B equ 1  ; true color 16 bits

ZB_MODE_INDEX  equ 2  ; color index 8 bits

ZB_MODE_RGBA   equ 3  ; 32 bit rgba mode

ZB_MODE_RGB24  equ 4  ; 24 bit rgb mode

ZB_NB_COLORS   equ 225 ; number of colors for 8 bit display

if TGL_FEATURE_RENDER_BITS eq 24

macro RGB_TO_PIXEL r,g,b

{

	mov eax,b

	shr eax,8

	push eax

		mov eax,g

		and eax,0xff00

		or dword[esp],eax

		mov eax,r

		shl eax,8

		or dword[esp],eax

	pop eax

}

;typedef unsigned char PIXEL;

PSZB equ 3

PSZSH equ 5

else if TGL_FEATURE_RENDER_BITS eq 32

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

;  ((((r) << 8) & 0xff0000) | ((g) & 0xff00) | ((b) >> 8))

;typedef unsigned int PIXEL;

;PSZB equ 4

;PSZSH equ 5

else

;#error Incorrect number of bits per pixel

end if

struct ZBuffer

	xsize dd ? ;int

	ysize dd ? ;int

	linesize dd ? ;int ;line size, in bytes

	mode dd ? ;int

	zbuf dd ? ;*unsigned short

	pbuf dd ? ;*PIXEL

	frame_buffer_allocated dd ? ;int

	nb_colors dd ? ;int

	dctable dd ? ;*unsigned char

	ctable dd ? ;*int

	current_texture dd ? ;*PIXEL

	s_log2 dd ? ;unsigned int

	s_bound dd ? ;unsigned int

	t_bound dd ? ;unsigned int

ends

offs_zbuf_xsize equ 0

offs_zbuf_ysize equ 4

offs_zbuf_linesize equ 8

offs_zbuf_mode equ 16

offs_zbuf_zbuf equ 20

offs_zbuf_pbuf equ 24

offs_zbuf_frame_buffer_allocated equ 28

offs_zbuf_nb_colors equ 32

offs_zbuf_dctable equ 36

offs_zbuf_ctable equ 40

offs_zbuf_current_texture equ 44

offs_zbuf_s_log2 equ 48

offs_zbuf_s_bound equ 52

offs_zbuf_t_bound equ 56

struct ZBufferPoint

	x dd ? ;int ;integer coordinates in the zbuffer

	y dd ? ;int

	z dd ? ;int

	s dd ? ;int ;coordinates for the mapping

	t dd ? ;int

	r dd ? ;int ;color indexes

	g dd ? ;int

	b dd ? ;int

	fsz dd ? ;float ;temporary coordinates for mapping

	tz dd ? ;float

ends

offs_zbup_x equ  0

offs_zbup_y equ  4

offs_zbup_z equ  8

offs_zbup_s equ 12

offs_zbup_t equ 16

offs_zbup_r equ 20

offs_zbup_g equ 24

offs_zbup_b equ 28

offs_zbup_sz equ 32

offs_zbup_tz equ 36

; ztriangle.c

;

; Memory allocator for TinyGL

;

; modify these functions so that they suit your needs

align 4

proc gl_free uses eax ebx ecx, mptr:dword

	mov ecx,[mptr]

	or ecx,ecx

	jz @f

		mcall 68, 13

	@@:

	ret

endp

;description:

; выделение памяти

align 4

proc gl_malloc uses ebx ecx, size:dword

	mcall 68, 12, [size]

	ret

endp

;description:

; выделение очищеной памяти

align 4

proc gl_zalloc uses ebx ecx edi, size:dword

	mov ecx,[size]

	stdcall gl_malloc,ecx

	or eax,eax

	jz @f

		mov ebx,eax

		mov edi,eax

		xor eax,eax

		shr ecx,2

		rep stosd ;очистка памяти (пишем везде 0)

		mov eax,ebx

	@@:

	ret

endp