diff --git a/programs/develop/libraries/TinyGL/asm_fork/clip.asm b/programs/develop/libraries/TinyGL/asm_fork/clip.asm
index 0ca6683a83..4bb4634acb 100644
--- a/programs/develop/libraries/TinyGL/asm_fork/clip.asm
+++ b/programs/develop/libraries/TinyGL/asm_fork/clip.asm
@@ -8,15 +8,6 @@ CLIP_YMAX equ (1<<3)
 CLIP_ZMIN equ (1<<4)
 CLIP_ZMAX equ (1<<5)
 
-offs_X equ 0
-offs_Y equ 4
-offs_Z equ 8
-offs_W equ 12
-
-if DEBUG
-f_ttv db ' gl_transform_to_viewport',0
-end if
-
 align 4
 proc gl_transform_to_viewport uses eax ebx ecx, context:dword,v:dword
 locals
@@ -87,31 +78,6 @@ endl
 		fistp dword[ebx+offs_vert_zp+offs_zbup_t]
 		add dword[ebx+offs_vert_zp+offs_zbup_s],ZB_POINT_T_MIN
 	@@:
-if DEBUG ;gl_transform_to_viewport
-pushad
-	mov ecx,80
-	mov eax,[ebx+offs_vert_zp]
-	lea edi,[buf_param]
-	stdcall convert_int_to_str,ecx
-	stdcall str_n_cat,edi,txt_zp_sp,2
-	stdcall str_len,edi
-	add edi,eax
-	sub ecx,eax
-
-	mov eax,[ebx+offs_vert_zp+offs_zbup_y]
-	stdcall convert_int_to_str,ecx
-	stdcall str_n_cat,edi,txt_zp_sp,2
-	stdcall str_len,edi
-	add edi,eax
-	sub ecx,eax
-
-	mov eax,[ebx+offs_vert_zp+offs_zbup_z]
-	stdcall convert_int_to_str,ecx
-
-	stdcall str_n_cat,edi,txt_nl,2
-	stdcall dbg_print,f_ttv,buf_param
-popad
-end if
 	ret
 endp
 
diff --git a/programs/develop/libraries/TinyGL/asm_fork/zgl.inc b/programs/develop/libraries/TinyGL/asm_fork/zgl.inc
index 6d5abda0b8..2ab3f0d673 100644
--- a/programs/develop/libraries/TinyGL/asm_fork/zgl.inc
+++ b/programs/develop/libraries/TinyGL/asm_fork/zgl.inc
@@ -2,6 +2,10 @@ include 'opengl_const.inc'
 include 'zbuffer.inc'
 include 'zmath.inc'
 
+offs_X equ 0
+offs_Y equ 4
+offs_Z equ 8
+offs_W equ 12
 
 ;enum { OP_ ## a , ... }
 sum1 equ 0
diff --git a/programs/develop/libraries/TinyGL/asm_fork/zmath.asm b/programs/develop/libraries/TinyGL/asm_fork/zmath.asm
index 84b1c70767..50c1f6b336 100644
--- a/programs/develop/libraries/TinyGL/asm_fork/zmath.asm
+++ b/programs/develop/libraries/TinyGL/asm_fork/zmath.asm
@@ -207,7 +207,7 @@ proc gl_M4_MulV4 uses ebx ecx edx, a:dword, b:dword, c:dword ;V4 *a, M4 *b, V4 *
 		fmul st0,st3      ;st0 *= c.Z
 		faddp
 		fld dword[ebx+12] ;st0 += m[_][3]
-		fmul st0,st2      ;st0 *= c.Z
+		fmul st0,st2      ;st0 *= c.W
 		faddp
 		fstp dword[edx]   ;a.X = b.m[_][0]*c.X +b.m[_][1]*c.Y +b.m[_][2]*c.Z +b.m[_][3]*c.W
 		add ebx,16 ;следущая строка матрицы
@@ -343,14 +343,18 @@ endl
 			shl eax,2
 			add eax,[m]
 			fld dword[eax]
-			fcom dword[max] ;if (fabs(m[i*n+j])>fabs(max))
+			fld st0
+			fabs
+			fld dword[max]
+			fabs
+			fcompp ;if (fabs(m[i*n+j])>fabs(max))
 			fstsw ax
 			sahf
-			jbe @f
+			jae @f
 				mov edx,edi ;k=i
 				fst dword[max]
 			@@:
-			ffree st0
+			ffree st0 ;m[i*n+j]
 			fincstp
 		inc edi
 		jmp .cycle_1
@@ -600,10 +604,10 @@ proc gl_V3_Norm uses ebx, a:dword
 	mov ebx,[a]
 	fld dword[ebx]
 	fmul st0,st0
-	fld dword[ebx+4]
+	fld dword[ebx+offs_Y]
 	fmul st0,st0
 	faddp
-	fld dword[ebx+8]
+	fld dword[ebx+offs_Z]
 	fmul st0,st0
 	faddp
 	fsqrt ;st0 = sqrt(a.X^2 +a.Y^2 +a.Z^2)
@@ -614,12 +618,12 @@ proc gl_V3_Norm uses ebx, a:dword
 		fld dword[ebx] ;offs_X = 0
 		fdiv st0,st1
 		fstp dword[ebx] ;a.X/=sqrt(...)
-		fld dword[ebx+4]
+		fld dword[ebx+offs_Y]
 		fdiv st0,st1
-		fstp dword[ebx+4] ;a.Y/=sqrt(...)
-		fld dword[ebx+8]
+		fstp dword[ebx+offs_Y] ;a.Y/=sqrt(...)
+		fld dword[ebx+offs_Z]
 		fdiv st0,st1
-		fstp dword[ebx+8] ;a.Z/=sqrt(...)
+		fstp dword[ebx+offs_Z] ;a.Z/=sqrt(...)
 		xor eax,eax
 		jmp @f
 	.r1: