diff --git a/programs/develop/libraries/TinyGL/asm_fork/clip.asm b/programs/develop/libraries/TinyGL/asm_fork/clip.asm
index f7bf17004c..988b4f93f8 100644
--- a/programs/develop/libraries/TinyGL/asm_fork/clip.asm
+++ b/programs/develop/libraries/TinyGL/asm_fork/clip.asm
@@ -702,7 +702,7 @@ pushad
 	mov ebx,[p0]
 	mov ecx,[p1]
 	mov edx,[p2]
-	
+
 	mov edi,[ebx+offs_vert_clip_code]
 	mov dword[cc],edi
 	mov eax,[ecx+offs_vert_clip_code]
@@ -719,8 +719,8 @@ pushad
 		sub edi,dword[ebx+offs_vert_zp+offs_zbup_x]
 		mov dword[norm],edi
 		fild dword[norm]
-		mov esi,dword[ecx+offs_vert_zp+offs_zbup_y]
-		sub esi,dword[ebx+offs_vert_zp+offs_zbup_y]
+		mov edi,dword[ecx+offs_vert_zp+offs_zbup_y]
+		sub edi,dword[ebx+offs_vert_zp+offs_zbup_y]
 		mov dword[norm],edi
 		fimul dword[norm]
 		mov edi,dword[ecx+offs_vert_zp+offs_zbup_x]
@@ -770,6 +770,7 @@ pushad
 			cmp dword[front],0
 			je @f
 				stdcall dword[edi+offs_cont_draw_triangle_front], edi,ebx,ecx,edx
+				jmp .end_f
 			@@:
 				stdcall dword[edi+offs_cont_draw_triangle_back], edi,ebx,ecx,edx
 		jmp .end_f
@@ -801,20 +802,6 @@ pushad
 	mov ecx,[p1]
 	mov edx,[p2]
 
-if DEBUG ;(1) gl_draw_triangle_clip
-pushad
-	stdcall dbg_print,txt_sp,m_1
-	add ebx,offs_vert_color
-	add ecx,offs_vert_color
-	add edx,offs_vert_color
-	stdcall gl_print_matrix,ebx,1
-	stdcall gl_print_matrix,ecx,1
-	stdcall gl_print_matrix,edx,1
-popad
-end if
-
-;	finit ;???
-
 	mov edi,[ebx+offs_vert_clip_code]
 	mov [cc],edi
 	mov eax,[ecx+offs_vert_clip_code]
diff --git a/programs/develop/libraries/TinyGL/asm_fork/vertex.asm b/programs/develop/libraries/TinyGL/asm_fork/vertex.asm
index 04d2be473c..8d7cc4e6e8 100644
--- a/programs/develop/libraries/TinyGL/asm_fork/vertex.asm
+++ b/programs/develop/libraries/TinyGL/asm_fork/vertex.asm
@@ -46,8 +46,8 @@ endl
 	rep movsd
 
 	mov eax,[context]
-	cmp dword[eax+offs_cont_color_material_enabled],1
-	jne @f
+	cmp dword[eax+offs_cont_color_material_enabled],0
+	je @f
 		mov dword[q],OP_Material
 		mov ecx,[eax+offs_cont_current_color_material_mode]
 		mov dword[q+4],ecx
@@ -55,7 +55,8 @@ endl
 		mov dword[q+8],ecx
 		mov esi,[p]
 		add esi,4
-		mov edi,dword[q+12] ;edi = [q3]
+		mov edi,ebp
+		sub edi,16 ;edi = &q[3]
 		mov ecx,4
 		rep movsd
 		stdcall glopMaterial, eax,[q]
@@ -147,11 +148,7 @@ endl
 		add ecx,offs_cont_matrix_model_projection
 		; precompute projection matrix
 		stdcall gl_M4_Mul, ecx,dword[edx+offs_cont_matrix_stack_ptr+4],dword[edx+offs_cont_matrix_stack_ptr]
-;if DEBUG ;glopBegin
-		;stdcall gl_print_matrix,ecx,4
-		;stdcall gl_print_matrix,[edx+offs_cont_matrix_stack_ptr+4],4
-		;stdcall gl_print_matrix,[edx+offs_cont_matrix_stack_ptr],4
-;end if
+
 		; test to accelerate computation
 		mov dword[edx+offs_cont_matrix_model_projection_no_w_transform],0
 		fldz
@@ -455,6 +452,10 @@ pushad
 	.els_0:
 		mov eax,[edx+offs_cont_current_color]
 		mov [ebx+offs_vert_color],eax
+		mov eax,[edx+offs_cont_current_color+4]
+		mov [ebx+offs_vert_color+4],eax
+		mov eax,[edx+offs_cont_current_color+8]
+		mov [ebx+offs_vert_color+8],eax
 	@@:
 
 	; tex coords
@@ -570,11 +571,23 @@ pushad
 	jne @f
 		cmp dword[n],4
 		jne .end_f
-;           c->vertex[2].edge_flag = 0;
-;           gl_draw_triangle(c, &c->vertex[0], &c->vertex[1], &c->vertex[2]);
-;           c->vertex[2].edge_flag = 1;
-;           c->vertex[0].edge_flag = 0;
-;           gl_draw_triangle(c, &c->vertex[0], &c->vertex[2], &c->vertex[3]);
+			mov eax,[edx+offs_cont_vertex]
+			add eax,2*sizeof.GLVertex
+			mov dword[eax+offs_vert_edge_flag],0 ;context.vertex[2].edge_flag = 0
+			push eax
+			sub eax,sizeof.GLVertex
+			push eax
+			sub eax,sizeof.GLVertex
+			stdcall gl_draw_triangle, edx,eax ;v0,v1,v2
+			mov dword[eax+offs_vert_edge_flag],0 ;context.vertex[0].edge_flag = 0
+			add eax,2*sizeof.GLVertex
+			mov dword[eax+offs_vert_edge_flag],1 ;context.vertex[2].edge_flag = 1
+			add eax,sizeof.GLVertex
+			push eax
+			sub eax,sizeof.GLVertex
+			push eax
+			sub eax,2*sizeof.GLVertex
+			stdcall gl_draw_triangle, edx,eax ;v0,v2,v3
 			xor eax,eax
 			mov dword[n],eax
 		jmp .end_f
@@ -591,10 +604,7 @@ pushad
 		jmp .end_f
 	@@:
 	cmp dword[edx+offs_cont_begin_type],GL_POLYGON
-	jne @f
-		;...
-		jmp .end_f
-	@@:
+	je .end_f
 ;    default:
 ;       gl_fatal_error("glBegin: type %x not handled\n", c->begin_type);
 ;    }
@@ -607,7 +617,7 @@ popad
 endp
 
 align 4
-proc glopEnd uses eax ebx, context:dword, p:dword
+proc glopEnd uses eax ebx ecx, context:dword, p:dword
 	mov eax,[context]
 ;    assert(c->in_begin == 1);
 
@@ -628,8 +638,14 @@ proc glopEnd uses eax ebx, context:dword, p:dword
 		@@: ;while (ebx >= 3)
 		cmp ebx,3
 		jl .end_i
-		dec ebx
-;           gl_draw_triangle(c, &c->vertex[i], &c->vertex[0], &c->vertex[i - 1]);
+			dec ebx
+			mov ecx,ebx
+			imul ecx,sizeof.GLVertex
+			add ecx,[eax+offs_cont_vertex]
+			push ecx ;ecx = &context.vertex[i]
+			sub ecx,sizeof.GLVertex
+			push ecx ;ecx = &context.vertex[i-1]
+			stdcall gl_draw_triangle, eax,[eax+offs_cont_vertex]
 		jmp @b
 	.end_i:
 	mov dword[eax+offs_cont_in_begin],0
diff --git a/programs/develop/libraries/TinyGL/asm_fork/zbuffer.inc b/programs/develop/libraries/TinyGL/asm_fork/zbuffer.inc
index f32aad54fd..e79c9cea4d 100644
--- a/programs/develop/libraries/TinyGL/asm_fork/zbuffer.inc
+++ b/programs/develop/libraries/TinyGL/asm_fork/zbuffer.inc
@@ -8,17 +8,17 @@ ZB_Z_BITS equ 16
 
 ZB_POINT_Z_FRAC_BITS equ 14
 
-ZB_POINT_S_MIN equ ( (1 shl 13) )
+ZB_POINT_S_MIN equ (1 shl 13)
 ZB_POINT_S_MAX equ ( (1 shl 22)-(1 shl 13) )
-ZB_POINT_T_MIN equ ( (1 shl 21) )
+ZB_POINT_T_MIN equ (1 shl 21)
 ZB_POINT_T_MAX equ ( (1 shl 30)-(1 shl 21) )
 
-ZB_POINT_RED_MIN equ ( (1 shl 10) )
-ZB_POINT_RED_MAX equ ( (1 shl 16)-(1 shl 10) )
-ZB_POINT_GREEN_MIN equ ( (1 shl 9) )
-ZB_POINT_GREEN_MAX equ ( (1 shl 16)-(1 shl 9) )
-ZB_POINT_BLUE_MIN equ ( (1 shl 10) )
-ZB_POINT_BLUE_MAX equ ( (1 shl 16)-(1 shl 10) )
+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