📄 our_draw32.c
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} // end if
} break;
case CLIP_CODE_NW:
{
// north hline intersection
yc2 = min_clip_y;
xc2 = x2 + 0.5+(min_clip_y-y2)*(x1-x2)/(y1-y2);
// test if intersection is valid, of so then done, else compute next
if (xc2 < min_clip_x || xc2 > max_clip_x)
{
xc2 = min_clip_x;
yc2 = y2 + 0.5+(min_clip_x-x2)*(y1-y2)/(x1-x2);
} // end if
} break;
case CLIP_CODE_SW:
{
// south hline intersection
yc2 = max_clip_y;
xc2 = x2 + 0.5+(max_clip_y-y2)*(x1-x2)/(y1-y2);
// test if intersection is valid, of so then done, else compute next
if (xc2 < min_clip_x || xc2 > max_clip_x)
{
xc2 = min_clip_x;
yc2 = y2 + 0.5+(min_clip_x-x2)*(y1-y2)/(x1-x2);
} // end if
} break;
default:break;
} // end switch
// do bounds check
if ((xc1 < min_clip_x) || (xc1 > max_clip_x) ||
(yc1 < min_clip_y) || (yc1 > max_clip_y) ||
(xc2 < min_clip_x) || (xc2 > max_clip_x) ||
(yc2 < min_clip_y) || (yc2 > max_clip_y) )
{
return(0);
} // end if
// store vars back
*x11 = xc1;
*y11 = yc1;
*x21 = xc2;
*y21 = yc2;
return(1);
} // end Clip_Line
//=================================================================================
int OUR_Draw_Clip_Line32(int x0,int y0, int x1, int y1, int color,
UCHAR *dest_buffer, int lpitch)
{
// this function draws a clipped line
int cxs, cys,
cxe, cye;
// clip and draw each line
cxs = x0;
cys = y0;
cxe = x1;
cye = y1;
// clip the line
if (OUR_Clip_Line(&cxs,&cys,&cxe,&cye))
OUR_Draw_Line32(cxs, cys, cxe,cye,color,dest_buffer,lpitch);
// return success
return(1);
} // end Draw_Clip_Line32
//--------------------------------------------------------------------
void OUR_Draw_Wire32( OUR_3D_OBJ_PTR obj,UCHAR *video_buffer, int lpitch)
{
UINT i1,i2,i3;
UINT poly;
UINT num;
UINT poly_change;
FIX_POINT3D_PTR point_work=obj->pPoints_work;
OUR_3D_TRAG_PTR triangle_work=obj->pTriangle;
num=obj->pTriangle_num_changed;
for (poly=0; poly <num; poly++)
{
//if(OUR_D_FrameTH==obj->pTriangle_changed[poly])
{
poly_change=obj->pTriangle_changed[poly];
i1=triangle_work[poly_change].p1;
i2=triangle_work[poly_change].p2;
i3=triangle_work[poly_change].p3;
OUR_Draw_Clip_Line32(point_work[i1].MM.x,
point_work[i1].MM.y,
point_work[i2].MM.x,
point_work[i2].MM.y,
// triangle_work[poly_change].CC_work.clor,
obj->clor_work[poly_change],
video_buffer, lpitch);
OUR_Draw_Clip_Line32( point_work[i3].MM.x,
point_work[i3].MM.y,
point_work[i2].MM.x,
point_work[i2].MM.y,
// triangle_work[poly_change].CC_work.clor,
obj->clor_work[poly_change],
video_buffer, lpitch);
OUR_Draw_Clip_Line32( point_work[i1].MM.x,
point_work[i1].MM.y,
point_work[i3].MM.x,
point_work[i3].MM.y,
// triangle_work[poly_change].CC_work.clor,
obj->clor_work[poly_change],
video_buffer, lpitch);
OUR_D_triangle_drawed_num++;
}
}
} // end Draw_RENDERLIST4DV1_Wire
//===========================================================
//--------------------------------------------------------------------------
#define DRAW_T_SHIFT 20
void OUR_Draw_Triangle_2D32( int x1,int y1,
int x2,int y2,
int x3,int y3,
CLR color,
UCHAR *dest_buffer, int mempitch)
{
int xs,xe,ks,ke,xinc;
int yinc;
CLR *dest;
//make sure y1<y2<y3
if(y1>y2)
{
OUR_SWAP(y1,y2,xs);
OUR_SWAP(x1,x2,xs);
}
if(y1>y3)
{
OUR_SWAP(y1,y3,xs);
OUR_SWAP(x1,x3,xs);
}
if(y2>y3)
{
OUR_SWAP(y2,y3,xs);
OUR_SWAP(x2,x3,xs);
} //18t
//mempitch>>=2;//(sizeof(dest)/2);
dest = (CLR*)dest_buffer +y1*mempitch; //point to the line of y1
if(y1<y2 )//the top part
{
ks=((x1-x2)<<DRAW_T_SHIFT)/(y1-y2); //slope 1 --> 2
ke=((x1-x3)<<DRAW_T_SHIFT)/(y1-y3); //slope 1 --> 3
if(ks>ke) //start slope must be smaller than the end one
{
OUR_SWAP(ks,ke,xs);
}
xs=x1<<DRAW_T_SHIFT;
xe=xs;
for(yinc=y1;yinc<y2;yinc++) //scan lines
{
//y1=xe>>8;
for(xinc=xs>>DRAW_T_SHIFT;xinc<=(xe>>DRAW_T_SHIFT);xinc++) //scan point
{
dest[xinc] =color; //display
}
dest+=mempitch; //point to next line
xs+=ks; //next line xs
xe+=ke; //next line xe
}
if(y2<y3)//the butt part
{
x1=((x2-x3)<<DRAW_T_SHIFT)/(y2-y3);
if(x1>ke)
{
ks=x1;
}
else
{
ke=x1;
}
for(;yinc<=y3;yinc++)
{
//y1=xe>>8;
for(xinc=xs>>DRAW_T_SHIFT;xinc<=(xe>>DRAW_T_SHIFT);xinc++)
{
dest[xinc] =color;
}
dest+=mempitch;
xs+=ks;
xe+=ke;
}
}
return;
}
else
{
if(y2<y3)//the butt part
{
ks=((x2-x3)<<DRAW_T_SHIFT)/(y1-y3);
ke=((x1-x3)<<DRAW_T_SHIFT)/(y1-y3);
if(ks<ke)
{
OUR_SWAP(ks,ke,xs);
}
if(x1<x2)
{
xs=x1<<DRAW_T_SHIFT;
xe=(x2<<DRAW_T_SHIFT);//+(xei>>1);
}
else
{
xs=x2<<DRAW_T_SHIFT;
xe=(x1<<DRAW_T_SHIFT);//+(xei>>1);
}
for(yinc=y1;yinc<y3;yinc++)
{
//y1=xe>>8;
for(xinc=xs>>DRAW_T_SHIFT;xinc<=(xe>>DRAW_T_SHIFT);xinc++)
{
dest[xinc] =color;
}
dest+=mempitch;
xs+=ks;
xe+=ke;
}
}
return;
}
}
//--------------------------------------------------------------------------
//------------------------------------
#define FILL_POINT { \
dest[xinc] =color; \
xinc++; \
}
//----------------------------------------------------------------------------
#define DRAW_P_SHFT_X 18
#define SHIFR_L 18
#define SHIFT 30
//------------------------------------------------------
#define FILE_GOURAUD32 {\
dest[xinc++] =((k_r_inc>>(SHIFR_L-16))&OUR_RGB_MASK0800)+\
((k_g_inc>>(SHIFR_L-8))&OUR_RGB_MASK0080)+((k_b_inc>>SHIFR_L)&OUR_RGB_MASK0008);\
\
k_r_inc+=kre;\
k_g_inc+=kge;\
k_b_inc+=kbe;\
}
//------------------------------------------------------
void OUR_Draw_Gouraud_2D32( int x1,int y1,
int x2,int y2,
int x3,int y3,
CLR color1,
CLR color2,
CLR color3,
UCHAR *dest_buffer, int mempitch)
{
int xs,xe,ks,ke,xinc;
int yinc;
CLR rs,re,gs,ge,bs,be;
int krs,kre,kgs,kge,kbs,kbe;
int k_r_inc;
int k_g_inc;
int k_b_inc;
CLR *dest;
/*
x1=200;
y1=0;
x2=1;
y2=200;
x3=350;
y3=350;
color1 = 0x000000;
color2 = 0xff0000;
color3 = 0x000000;
*/
//make sure y1<y2<y3
if(y1>y2)
{
OUR_SWAP(y1,y2,xs);
OUR_SWAP(x1,x2,xs);
OUR_SWAP(color1,color2,rs);
}
if(y1>y3)
{
OUR_SWAP(y1,y3,xs);
OUR_SWAP(x1,x3,xs);
OUR_SWAP(color1,color3,rs);
}
if(y2>y3)
{
OUR_SWAP(y2,y3,xs);
OUR_SWAP(x2,x3,xs);
OUR_SWAP(color2,color3,rs);
} //18t
//mempitch>>=2; //(sizeof(dest)/2);
dest = (CLR*)dest_buffer +y1*mempitch; //point to the line of y1
#if 1
if(y1<y2 ) //the top part
{
xs=(1<<(DRAW_P_SHFT_X))/(y1-y2);
xe=(1<<(DRAW_P_SHFT_X))/(y1-y3);
ks=((x1-x2))*xs; //slope 1 --> 2
ke=((x1-x3))*xe; //slope 1 --> 3
xs>>=(DRAW_P_SHFT_X-SHIFR_L);
xe>>=(DRAW_P_SHFT_X-SHIFR_L);
if(ks>ke) //start slope must be smaller than the end one
{
kre=(((color1&OUR_RGB_MASK0800)-(color2&OUR_RGB_MASK0800))>>16)*xs;
krs=(((color1&OUR_RGB_MASK0800)-(color3&OUR_RGB_MASK0800))>>16)*xe;
kge=(((color1&OUR_RGB_MASK0080)-(color2&OUR_RGB_MASK0080))>>8)*xs;
kgs=(((color1&OUR_RGB_MASK0080)-(color3&OUR_RGB_MASK0080))>>8)*xe;
kbe=(((color1&OUR_RGB_MASK0008)-(color2&OUR_RGB_MASK0008)))*xs;
kbs=(((color1&OUR_RGB_MASK0008)-(color3&OUR_RGB_MASK0008)))*xe;
OUR_SWAP(ks,ke,xs);
}
else if(ks<ke)
{
krs=(((color1&OUR_RGB_MASK0800)-(color2&OUR_RGB_MASK0800))>>16)*xs;
kre=(((color1&OUR_RGB_MASK0800)-(color3&OUR_RGB_MASK0800))>>16)*xe;
kgs=(((color1&OUR_RGB_MASK0080)-(color2&OUR_RGB_MASK0080))>>8)*xs;
kge=(((color1&OUR_RGB_MASK0080)-(color3&OUR_RGB_MASK0080))>>8)*xe;
kbs=(((color1&OUR_RGB_MASK0008)-(color2&OUR_RGB_MASK0008)))*xs;
kbe=(((color1&OUR_RGB_MASK0008)-(color3&OUR_RGB_MASK0008)))*xe;
}
else
{
return;
}
#define GND_KKKK 0
if((ke-ks)<(2<<DRAW_P_SHFT_X))//
{
xs=((1<<(SHIFT-4)))/((ke-ks));
kre=(((kre-krs)>>5)*xs)>>(SHIFT-SHIFR_L-5-4);
kge=(((kge-kgs)>>5)*xs)>>(SHIFT-SHIFR_L-5-4);
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