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