62b33c4994
Can draw lines, and do some matrix operations. git-svn-id: svn://kolibrios.org@5153 a494cfbc-eb01-0410-851d-a64ba20cac60
147 lines
3.4 KiB
NASM
147 lines
3.4 KiB
NASM
; simple gl like driver for TinyGL and KolibriOS - porting iadn
|
|
|
|
|
|
struct TinyGLContext
|
|
gl_context dd ?
|
|
xsize dd ? ;+4
|
|
ysize dd ? ;+8
|
|
d_x dd ? ;+12
|
|
d_y dd ? ;+16
|
|
x dd ? ;+20
|
|
y dd ? ;+24
|
|
ends
|
|
|
|
;KOSGLContext kosglCreateContext(KOSGLContext shareList, int flags)
|
|
;{
|
|
; TinyGLContext *ctx;
|
|
;
|
|
; if (shareList != NULL) {
|
|
; gl_fatal_error("No sharing available in TinyGL");
|
|
; }
|
|
;
|
|
; ctx=gl_malloc(sizeof(TinyGLContext));
|
|
; if (!ctx)
|
|
; return NULL;
|
|
; ctx->gl_context=NULL;
|
|
; return (KOSGLContext) ctx;
|
|
;}
|
|
|
|
;void kosglDestroyContext( KOSGLContext ctx1 )
|
|
;{
|
|
; TinyGLContext *ctx = (TinyGLContext *) ctx1;
|
|
; if (ctx->gl_context != NULL) {
|
|
; glClose();
|
|
; }
|
|
; gl_free(ctx);
|
|
;}
|
|
|
|
; resize the glx viewport : we try to use the xsize and ysize
|
|
; given. We return the effective size which is guaranted to be smaller
|
|
|
|
align 4
|
|
proc gl_resize_viewport uses ebx ecx edx edi esi, context:dword, xsize_ptr:dword, ysize_ptr:dword
|
|
xor eax,eax
|
|
|
|
mov ecx,[xsize_ptr] ; ecx = &xsize
|
|
mov edi,[ecx] ; edi = xsize
|
|
mov esi,[ysize_ptr] ; esi = &ysize
|
|
mov esi,[esi] ; esi = ysize
|
|
|
|
; we ensure that xsize and ysize are multiples of 2 for the zbuffer.
|
|
; TODO: find a better solution
|
|
and edi, not 3
|
|
and esi, not 3
|
|
|
|
cmp edi,0
|
|
jne @f
|
|
cmp esi,0
|
|
jne @f
|
|
mov eax,-1
|
|
jmp .end_f
|
|
@@:
|
|
|
|
mov [ecx],edi
|
|
dec dword[ecx]
|
|
mov ecx,[ysize_ptr]
|
|
mov [ecx],esi
|
|
dec dword[ecx]
|
|
|
|
mov ebx,[context]
|
|
mov edx,[ebx+offs_cont_opaque] ; edx = (TinyGLContext *)context.opaque
|
|
mov [edx+4],edi
|
|
mov [edx+12],edi ;d_x = xsize
|
|
mov [edx+8],esi
|
|
mov [edx+16],esi ;d_y = ysize
|
|
|
|
; resize the Z buffer
|
|
stdcall ZB_resize, dword[ebx+offs_cont_zb],0,edi,esi
|
|
.end_f:
|
|
ret
|
|
endp
|
|
|
|
; we assume here that drawable is a window
|
|
align 4
|
|
proc kosglMakeCurrent uses ebx ecx, win_x0:dword, win_y0:dword, win_x:dword, win_y:dword, ctx1:dword
|
|
mov ebx,[ctx1]
|
|
cmp dword[ebx],0 ;if (ctx.gl_context == NULL)
|
|
jne .end_f
|
|
; create the TinyGL context
|
|
mov ecx,[win_x0]
|
|
mov [ebx+20],ecx ;ctx.x = win_x0
|
|
mov ecx,[win_y0]
|
|
mov [ebx+24],ecx ;ctx.y = win_y0
|
|
mov ecx,[win_x]
|
|
mov [ebx+12],ecx ;ctx.d_x = win_x
|
|
mov ecx,[win_y]
|
|
mov [ebx+16],ecx ;ctx.d_y = win_y
|
|
|
|
; currently, we only support 16 bit rendering
|
|
xor eax,eax
|
|
stdcall ZB_open, dword[win_x], dword[win_y], dword ZB_MODE_RGB24, eax,eax,eax,eax ;NULL,NULL,NULL
|
|
|
|
cmp eax,0
|
|
jne @f
|
|
stdcall dbg_print,f_kosgl_1,err_0
|
|
xor eax,eax
|
|
jmp .err_f
|
|
@@:
|
|
|
|
; initialisation of the TinyGL interpreter
|
|
stdcall glInit, eax
|
|
|
|
call gl_get_context
|
|
mov [ebx],eax ;ctx.gl_context = eax
|
|
|
|
mov [eax+offs_cont_opaque],ebx ;ctx.gl_context.opaque = ctx
|
|
mov dword[eax+offs_cont_gl_resize_viewport],gl_resize_viewport
|
|
|
|
; set the viewport : we force a call to gl_resize_viewport
|
|
dec dword[eax+offs_cont_viewport+offs_vpor_xsize]
|
|
dec dword[eax+offs_cont_viewport+offs_vpor_ysize]
|
|
|
|
stdcall glViewport, 0, 0, [win_x], [win_y]
|
|
.end_f:
|
|
xor eax,eax
|
|
inc eax
|
|
.err_f:
|
|
ret
|
|
endp
|
|
|
|
align 4
|
|
proc kosglSwapBuffers uses eax ebx ecx edx esi
|
|
; retrieve the current TinyGLContext
|
|
call gl_get_context
|
|
mov ebx,[eax+offs_cont_zb]
|
|
mov ebx,[ebx+offs_zbuf_pbuf]
|
|
mov esi,[eax+offs_cont_opaque] ;esi = &context.opaque
|
|
mov eax,7
|
|
mov ecx,[esi+12] ;d_x
|
|
shl ecx,16
|
|
mov cx,[esi+16] ;d_y
|
|
mov edx,[esi+20] ;x
|
|
shl edx,16
|
|
mov dx,[esi+24] ;y
|
|
int 0x40
|
|
ret
|
|
endp
|