kolibrios-gitea/programs/develop/libraries/TinyGL/asm_fork/glu.asm

struct GLUquadricObj
	DrawStyle   dd ? ; GLU_FILL, LINE, SILHOUETTE, or POINT
	Orientation dd ? ; GLU_INSIDE or GLU_OUTSIDE
	TextureFlag dd ? ; Generate texture coords?
	Normals     dd ? ; GLU_NONE, GLU_FLAT, or GLU_SMOOTH
	ErrorFunc   dd ? ; Error handler callback function
ends

offs_qobj_DrawStyle equ 0
offs_qobj_Orientation equ 4
offs_qobj_TextureFlag equ 8
offs_qobj_Normals equ 12
offs_qobj_ErrorFunc equ 16

;void drawTorus(float rc, int numc, float rt, int numt)
;{
;}

;static void normal3f(GLfloat x, GLfloat y, GLfloat z )
;{
;}

;void gluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar )
;{
;}

;void gluLookAt(GLdouble eyex, GLdouble eyey, GLdouble eyez,
;	  GLdouble centerx, GLdouble centery, GLdouble centerz,
;	  GLdouble upx, GLdouble upy, GLdouble upz)
;{
;}

align 4
gluNewQuadric:
	stdcall gl_malloc, sizeof.GLUquadricObj
	or eax,eax
	jz @f
		mov dword[eax+offs_qobj_DrawStyle],GLU_FILL
		mov dword[eax+offs_qobj_Orientation],GLU_OUTSIDE
		mov dword[eax+offs_qobj_TextureFlag],GL_FALSE
		mov dword[eax+offs_qobj_Normals],GLU_SMOOTH
		mov dword[eax+offs_qobj_ErrorFunc],0 ;NULL
	@@:
	ret

align 4
proc gluDeleteQuadric, state:dword
	cmp dword[state],0
	je @f
		stdcall gl_free,[state]
	@@:
	ret
endp

;
; Set the drawing style to be GLU_FILL, GLU_LINE, GLU_SILHOUETTE,
; or GLU_POINT.
;
align 4
proc gluQuadricDrawStyle uses eax ebx, qobj:dword, drawStyle:dword
	mov eax,[qobj]
	or eax,eax
	jz .err_q
	mov ebx,[drawStyle]
	cmp ebx,GLU_FILL
	je @f
	cmp ebx,GLU_LINE
	je @f
	cmp ebx,GLU_SILHOUETTE
	je @f
	cmp ebx,GLU_POINT
	je @f
	jmp .err_q
	@@:
		mov dword[eax+offs_qobj_DrawStyle],ebx
		jmp @f
	.err_q:
		;quadric_error(qobj, GLU_INVALID_ENUM, "qluQuadricDrawStyle")
	@@:
	ret
endp

;
; Set the orientation to GLU_INSIDE or GLU_OUTSIDE.
;
align 4
proc gluQuadricOrientation uses eax ebx, qobj:dword, orientation:dword
	mov eax,[qobj]
	or eax,eax
	jz .err_q
	mov ebx,[orientation]
	cmp ebx,GLU_INSIDE
	je @f
	cmp ebx,GLU_OUTSIDE
	je @f
	jmp .err_q
	@@:
		mov dword[eax+offs_qobj_Orientation],ebx
		jmp @f
	.err_q:
		;quadric_error(qobj, GLU_INVALID_ENUM, "qluQuadricOrientation")
	@@:
	ret
endp

;void gluCylinder(GLUquadricObj *qobj, GLdouble baseRadius, GLdouble topRadius, GLdouble height, GLint slices, GLint stacks )
;{
;}

; Disk (adapted from Mesa)

;void gluDisk(GLUquadricObj *qobj, GLdouble innerRadius, GLdouble outerRadius, GLint slices, GLint loops )
;{
;}

;
; Sphere (adapted from Mesa)
;

;input:
; float radius, int slices, int stacks
align 4
proc gluSphere qobj:dword, radius:dword, slices:dword, stacks:dword
locals
	rho dd ? ;float
	drho dd ? 
	theta dd ? 
	dtheta dd ? 
	x dd ? ;float
	y dd ? ;float
	z dd ? ;float
	s dd ? ;float
	t dd ? ;float
	d_s dd ? ;float
	d_t dd ? ;float
	i dd ? ;int
	j dd ? ;int
	imax dd ? ;int
	normals dd ? ;int
	nsign dd ? ;float
endl
pushad

	mov eax,[qobj]
	cmp dword[eax+offs_qobj_Normals],GLU_NONE ;if (qobj.Normals==GLU_NONE)
	jne .els_0
		mov dword[normals],GL_FALSE
		jmp @f
	.els_0:
		mov dword[normals],GL_TRUE
	@@:
	cmp dword[eax+offs_qobj_Orientation],GLU_INSIDE ;if (qobj.Orientation==GLU_INSIDE)
	jne .els_1
		mov dword[nsign],-1.0
		jmp @f
	.els_1:
		mov dword[nsign],1.0
	@@:

	fldpi
	fidiv dword[stacks]
	fstp dword[drho]
	fld1
	fldpi
	fscale
	fidiv dword[slices]
	fstp dword[dtheta]
	ffree st0
	fincstp

	cmp dword[eax+offs_qobj_DrawStyle],GLU_FILL ;if (qobj.DrawStyle==GLU_FILL)
	jne .if_glu_line

	; draw +Z end as a triangle fan
	stdcall glBegin,GL_TRIANGLE_FAN
	cmp dword[normals],GL_TRUE
	jne @f
		stdcall glNormal3f, 0.0, 0.0, 1.0
	@@:
	cmp dword[eax+offs_qobj_TextureFlag],0 ;if (qobj.TextureFlag)
	je @f
;glTexCoord2f(0.5,0.0)
	@@:
	sub esp,4
	fld dword[nsign]
	fmul dword[radius]
	fstp dword[esp]
	stdcall glVertex3f, 0.0, 0.0 ;, nsign * radius
	fld dword[drho]
	fcos
	fmul dword[nsign]
	fstp dword[z] ;z = nsign * cos(drho)
	mov dword[j],0
	mov ecx,[slices]
align 4
	.cycle_0: ;for (j=0;j<=slices;j++)
		cmp dword[j],ecx
		jg .cycle_0_end
		fld dword[drho]
		fsin
		je @f
			fild dword[j]
			fmul dword[dtheta]
			jmp .t0_end
		@@:
			fldz
		.t0_end:
		fst dword[theta] ;theta = (j==slices) ? 0.0 : j * dtheta
		fsin
		fchs
		fmul st0,st1
		fstp dword[x] ;x = -sin(theta) * sin(drho)
		fld dword[theta]
		fcos
		fmulp
		fstp dword[y] ;y = cos(theta) * sin(drho)
		cmp dword[normals],GL_TRUE
		jne @f
			fld dword[nsign]
			fld dword[z]
			fmul st0,st1
			fstp dword[esp-4]
			fld dword[y]
			fmul st0,st1
			fstp dword[esp-8]
			fld dword[x]
			fmulp
			fstp dword[esp-12]
			sub esp,12
			stdcall glNormal3f ;x*nsign, y*nsign, z*nsign
		@@:
		fld dword[radius]
		fld dword[z]
		fmul st0,st1
		fstp dword[esp-4]
		fld dword[y]
		fmul st0,st1
		fstp dword[esp-8]
		fld dword[x]
		fmulp
		fstp dword[esp-12]
		sub esp,12
		call glVertex3f ;x*radius, y*radius, z*radius
		inc dword[j]
		jmp .cycle_0
	.cycle_0_end:
	call glEnd

	fld1
	fidiv dword[slices]
	fstp dword[d_s] ;1.0 / slices
	fld1
	fidiv dword[stacks]
	fstp dword[d_t] ;1.0 / stacks
	mov dword[t],1.0 ; because loop now runs from 0
	mov ebx,[stacks]
	cmp dword[eax+offs_qobj_TextureFlag],0 ;if (qobj.TextureFlag)
	je .els_2
		mov dword[i],0
		mov [imax],ebx
		jmp @f
	.els_2:
		mov dword[i],1
		dec ebx
		mov [imax],ebx
	@@:

	; draw intermediate stacks as quad strips
	mov ebx,[imax]
align 4
	.cycle_1: ;for (i=imin;i<imax;i++)
	cmp dword[i],ebx
	jge .cycle_1_end
	fild dword[i]
	fmul dword[drho]
	fstp dword[rho] ;rho = i * drho
	stdcall glBegin,GL_QUAD_STRIP
	mov dword[s],0.0
	mov dword[j],0
align 4
	.cycle_2: ;for (j=0;j<=slices;j++)
		cmp dword[j],ecx
		jg .cycle_2_end
		fld dword[rho]
		fsin
		je @f
			fild dword[j]
			fmul dword[dtheta]
			jmp .t1_end
		@@:
			fldz
		.t1_end:
		fst dword[theta] ;theta = (j==slices) ? 0.0 : j * dtheta
		fsin
		fchs
		fmul st0,st1
		fstp dword[x] ;x = -sin(theta) * sin(rho)
		fld dword[theta]
		fcos
		fmulp
		fstp dword[y] ;y = cos(theta) * sin(rho)
		fld dword[rho]
		fcos
		fmul dword[nsign]
		fstp dword[z] ;z = nsign * cos(rho)
		cmp dword[normals],GL_TRUE
		jne @f
			fld dword[nsign]
			fld dword[z]
			fmul st0,st1
			fstp dword[esp-4]
			fld dword[y]
			fmul st0,st1
			fstp dword[esp-8]
			fld dword[x]
			fmulp
			fstp dword[esp-12]
			sub esp,12
			stdcall glNormal3f ;x*nsign, y*nsign, z*nsign
		@@:
		cmp dword[eax+offs_qobj_TextureFlag],0 ;if (qobj.TextureFlag)
		je @f
;glTexCoord2f(s,1-t)
		@@:
		fld dword[radius]
		fld dword[z]
		fmul st0,st1
		fstp dword[esp-4]
		fld dword[y]
		fmul st0,st1
		fstp dword[esp-8]
		fld dword[x]
		fmulp
		fstp dword[esp-12]
		sub esp,12
		call glVertex3f ;x*radius, y*radius, z*radius
		fld dword[rho]
		fadd dword[drho]
		fsin ;st0 = sin(rho+drho)
		fld dword[theta]
		fsin
		fchs
		fmul st0,st1
		fstp dword[x] ;x = -sin(theta) * sin(rho+drho)
		fld dword[theta]
		fcos
		fmulp
		fstp dword[y] ;y = cos(theta) * sin(rho+drho)
		fld dword[rho]
		fadd dword[drho]
		fcos
		fmul dword[nsign]
		fstp dword[z] ;z = nsign * cos(rho+drho)
		cmp dword[normals],GL_TRUE
		jne @f
			fld dword[nsign]
			fld dword[z]
			fmul st0,st1
			fstp dword[esp-4]
			fld dword[y]
			fmul st0,st1
			fstp dword[esp-8]
			fld dword[x]
			fmulp
			fstp dword[esp-12]
			sub esp,12
			stdcall glNormal3f ;x*nsign, y*nsign, z*nsign
		@@:
		cmp dword[eax+offs_qobj_TextureFlag],0 ;if (qobj.TextureFlag)
		je @f
;glTexCoord2f(s,1-(t-dt))
			fld dword[s]
			fadd dword[d_s]
			fstp dword[s]
		@@:
		fld dword[radius]
		fld dword[z]
		fmul st0,st1
		fstp dword[esp-4]
		fld dword[y]
		fmul st0,st1
		fstp dword[esp-8]
		fld dword[x]
		fmulp
		fstp dword[esp-12]
		sub esp,12
		call glVertex3f ;x*radius, y*radius, z*radius
		inc dword[j]
		jmp .cycle_2
		.cycle_2_end:
	call glEnd
	fld dword[t]
	fsub dword[d_t]
	fstp dword[t]
	inc dword[i]
	jmp .cycle_1
	.cycle_1_end:

	; draw -Z end as a triangle fan
	stdcall glBegin,GL_TRIANGLE_FAN
	cmp dword[normals],GL_TRUE
	jne @f
		stdcall glNormal3f, 0.0, 0.0, -1.0
	@@:
	cmp dword[eax+offs_qobj_TextureFlag],0 ;if (qobj.TextureFlag)
	je @f
;glTexCoord2f(0.5,1.0)
		mov dword[s],1.0
		mov ebx,[d_t]
		mov [t],ebx
	@@:
	sub esp,4
	fld dword[radius]
	fchs
	fmul dword[nsign]
	fstp dword[esp]
	stdcall glVertex3f, 0.0, 0.0 ;, -radius*nsign
	fldpi
	fsub dword[drho]
	fst dword[rho]
	fcos
	fmul dword[nsign]
	fstp dword[z] ;z = nsign * cos(rho)
	mov [j],ecx
align 4
	.cycle_3: ;for (j=slices;j>=0;j--)
		cmp dword[j],0
		jl .cycle_3_end
		fld dword[rho]
		fsin
		je @f
			fild dword[j]
			fmul dword[dtheta]
			jmp .t2_end
		@@:
			fldz
		.t2_end:
		fst dword[theta] ;theta = (j==slices) ? 0.0 : j * dtheta
		fsin
		fchs
		fmul st0,st1
		fstp dword[x] ;x = -sin(theta) * sin(rho)
		fld dword[theta]
		fcos
		fmulp
		fstp dword[y] ;y = cos(theta) * sin(rho)
		cmp dword[normals],GL_TRUE
		jne @f
			fld dword[nsign]
			fld dword[z]
			fmul st0,st1
			fstp dword[esp-4]
			fld dword[y]
			fmul st0,st1
			fstp dword[esp-8]
			fld dword[x]
			fmul st0,st1
			fstp dword[esp-12]
			sub esp,12
			ffree st0
			fincstp
			stdcall glNormal3f ;x*nsign, y*nsign, z*nsign
		@@:
		cmp dword[eax+offs_qobj_TextureFlag],0 ;if (qobj.TextureFlag)
		je @f
;glTexCoord2f(s,1-t)
			fld dword[s]
			fsub dword[d_s]
			fstp dword[s]
		@@:
		fld dword[radius]
		fld dword[z]
		fmul st0,st1
		fstp dword[esp-4]
		fld dword[y]
		fmul st0,st1
		fstp dword[esp-8]
		fld dword[x]
		fmulp
		fstp dword[esp-12]
		sub esp,12
		call glVertex3f ;x*radius, y*radius, z*radius
		dec dword[j]
		jmp .cycle_3
	.cycle_3_end:
	call glEnd
	jmp .end_f

	.if_glu_line:
	cmp dword[eax+offs_qobj_DrawStyle],GLU_LINE ;if (qobj.DrawStyle==GLU_LINE)
	je @f
	cmp dword[eax+offs_qobj_DrawStyle],GLU_SILHOUETTE ;if (qobj.DrawStyle==GLU_SILHOUETTE)
	je @f
	jmp .if_glu_point
	@@:

	; draw stack lines
	mov dword[i],1
	mov ebx,[stacks]
	mov ecx,[slices]
align 4
	.cycle_4: ;for (i=1;i<stacks;i++)
		cmp dword[i],ebx
		jge .cycle_4_end
		; stack line at i==stacks-1 was missing here

		fild dword[i]
		fmul dword[drho]
		fstp dword[rho] ;rho = i * drho
		stdcall glBegin,GL_LINE_LOOP
		mov dword[j],0
align 4
		.cycle_5: ;for (j=0;j<slices;j++)
			cmp dword[j],ecx
			jge .cycle_5_end
			fild dword[j]
			fmul dword[dtheta]
			fst dword[theta] ;theta = j * dtheta;
			fcos
			fld dword[rho]
			fsin
			fxch ;толкаем sin(rho) в st1
			fmul st0,st1
			fstp dword[x] ;x = cos(theta) * sin(rho)
			fld dword[theta]
			fsin
			fmulp ;множим на sin(rho) ранее записанный в st1
			fstp dword[y] ;y = sin(theta) * sin(rho)
			fld dword[rho]
			fcos
			fstp dword[z] ;z = cos(rho)
			cmp dword[normals],GL_TRUE
			jne @f
				fld dword[nsign]
				fld dword[z]
				fmul st0,st1
				fstp dword[esp-4]
				fld dword[y]
				fmul st0,st1
				fstp dword[esp-8]
				fld dword[x]
				fmulp
				fstp dword[esp-12]
				sub esp,12
				stdcall glNormal3f ;x*nsign, y*nsign, z*nsign
			@@:
			fld dword[radius]
			fld dword[z]
			fmul st0,st1
			fstp dword[esp-4]
			fld dword[y]
			fmul st0,st1
			fstp dword[esp-8]
			fld dword[x]
			fmulp
			fstp dword[esp-12]
			sub esp,12
			call glVertex3f ;x*radius, y*radius, z*radius
			inc dword[j]
			jmp .cycle_5
		.cycle_5_end:
		call glEnd
		inc dword[i]
		jmp .cycle_4
	.cycle_4_end:

	; draw slice lines
	mov dword[j],0
align 4
	.cycle_6: ;for (j=0;j<slices;j++)
		cmp dword[j],ecx
		jge .cycle_6_end
		fild dword[j]
		fmul dword[dtheta]
		fstp dword[theta] ;theta = j * dtheta;
		stdcall glBegin,GL_LINE_STRIP
		mov dword[i],0
align 4
		.cycle_7: ;for (i=0;i<=stacks;i++)
			cmp dword[i],ebx
			jg .cycle_7_end
			fild dword[i]
			fmul dword[drho]
			fst dword[rho] ;rho = i * drho
			fsin
			fld dword[theta]
			fcos
			fmul st0,st1
			fstp dword[x] ;x = cos(theta) * sin(rho)
			fld dword[theta]
			fsin
			fmulp
			fstp dword[y] ;y = sin(theta) * sin(rho)
			fld dword[rho]
			fcos
			fstp dword[z] ;z = cos(rho)
			cmp dword[normals],GL_TRUE
			jne @f
				fld dword[nsign]
				fld dword[z]
				fmul st0,st1
				fstp dword[esp-4]
				fld dword[y]
				fmul st0,st1
				fstp dword[esp-8]
				fld dword[x]
				fmulp
				fstp dword[esp-12]
				sub esp,12
				stdcall glNormal3f ;x*nsign, y*nsign, z*nsign
			@@:
			fld dword[radius]
			fld dword[z]
			fmul st0,st1
			fstp dword[esp-4]
			fld dword[y]
			fmul st0,st1
			fstp dword[esp-8]
			fld dword[x]
			fmulp
			fstp dword[esp-12]
			sub esp,12
			call glVertex3f ;x*radius, y*radius, z*radius
			inc dword[i]
			jmp .cycle_7
		.cycle_7_end:
		call glEnd
		inc dword[j]
		jmp .cycle_6
	.cycle_6_end:
	jmp .end_f

	.if_glu_point:
	cmp dword[eax+offs_qobj_DrawStyle],GLU_POINT ;if (qobj.DrawStyle==GLU_POINT)
	jne .end_f

	; top and bottom-most points
	stdcall glBegin,GL_POINTS
	cmp dword[normals],GL_TRUE
	jne @f
		stdcall glNormal3f, 0.0,0.0,dword[nsign]
	@@:
	stdcall glVertex3f, 0.0,0.0,dword[radius]
	cmp dword[normals],GL_TRUE
	jne @f
		sub esp,4
		fld dword[nsign]
		fchs
		fstp dword[esp]
		stdcall glNormal3f, 0.0,0.0 ;,-nsign
	@@:
	sub esp,4
	fld dword[radius]
	fchs
	fstp dword[esp]
	stdcall glVertex3f, 0.0,0.0 ;,-radius

	; loop over stacks
	mov dword[i],1
	mov ebx,[stacks]
	mov ecx,[slices]
align 4
	.cycle_8: ;for (i=1;i<stacks;i++)
		cmp dword[i],ebx
		jge .cycle_8_end
		fild dword[i]
		fmul dword[drho]
		fstp dword[rho] ;rho = i * drho

		mov dword[j],0
align 4
		.cycle_9: ;for (j=0;j<slices;j++)
			cmp dword[j],ecx
			jge .cycle_9_end
			fild dword[j]
			fmul dword[dtheta]
			fst dword[theta] ;theta = j * dtheta;
			fcos
			fld dword[rho]
			fsin
			fxch ;толкаем sin(rho) в st1
			fmul st0,st1
			fstp dword[x] ;x = cos(theta) * sin(rho)
			fld dword[theta]
			fsin
			fmulp ;множим на sin(rho) ранее записанный в st1
			fstp dword[y] ;y = sin(theta) * sin(rho)
			fld dword[rho]
			fcos
			fstp dword[z] ;z = cos(rho)
			cmp dword[normals],GL_TRUE
			jne @f
				fld dword[nsign]
				fld dword[z]
				fmul st0,st1
				fstp dword[esp-4]
				fld dword[y]
				fmul st0,st1
				fstp dword[esp-8]
				fld dword[x]
				fmulp
				fstp dword[esp-12]
				sub esp,12
				stdcall glNormal3f ;x*nsign, y*nsign, z*nsign
			@@:
			fld dword[radius]
			fld dword[z]
			fmul st0,st1
			fstp dword[esp-4]
			fld dword[y]
			fmul st0,st1
			fstp dword[esp-8]
			fld dword[x]
			fmulp
			fstp dword[esp-12]
			sub esp,12
			call glVertex3f ;x*radius, y*radius, z*radius
			inc dword[j]
			jmp .cycle_9
		.cycle_9_end:
		inc dword[i]
		jmp .cycle_8
	.cycle_8_end:
	call glEnd

	.end_f:
popad
	ret
endp