#ifndef DBG
#define DBG 0
#endif

#ifndef HW_WRITE_LOCK
#define HW_WRITE_LOCK()		HW_LOCK()
#endif

#ifndef HW_WRITE_UNLOCK
#define HW_WRITE_UNLOCK()	HW_UNLOCK()
#endif

#ifndef HW_READ_LOCK
#define HW_READ_LOCK()		HW_LOCK()
#endif

#ifndef HW_READ_UNLOCK
#define HW_READ_UNLOCK()	HW_UNLOCK()
#endif

#ifndef HW_READ_CLIPLOOP
#define HW_READ_CLIPLOOP()	HW_CLIPLOOP()
#endif

#ifndef HW_WRITE_CLIPLOOP
#define HW_WRITE_CLIPLOOP()	HW_CLIPLOOP()
#endif


static void TAG(WriteRGBASpan)( const GLcontext *ctx,
				GLuint n, GLint x, GLint y,
				const GLubyte rgba[][4],
				const GLubyte mask[] )
{
   HW_WRITE_LOCK()
      {
	 GLint x1;
	 GLint n1;
	 LOCAL_VARS;

	 y = Y_FLIP(y);

	 HW_WRITE_CLIPLOOP()
	    {
	       GLint i = 0;
	       CLIPSPAN(x,y,n,x1,n1,i);

	       if (DBG) fprintf(stderr, "WriteRGBASpan %d..%d (x1 %d)\n",
				(int)i, (int)n1, (int)x1);

	       if (mask)
	       {
		  for (;n1>0;i++,x1++,n1--)
		     if (mask[i])
			WRITE_RGBA( x1, y,
				    rgba[i][0], rgba[i][1],
				    rgba[i][2], rgba[i][3] );
	       }
	       else
	       {
		  for (;n1>0;i++,x1++,n1--)
		     WRITE_RGBA( x1, y,
				 rgba[i][0], rgba[i][1],
				 rgba[i][2], rgba[i][3] );
	       }
	    }
	 HW_ENDCLIPLOOP();
      }
   HW_WRITE_UNLOCK();
}

static void TAG(WriteRGBSpan)( const GLcontext *ctx,
			       GLuint n, GLint x, GLint y,
			       const GLubyte rgb[][3],
			       const GLubyte mask[] )
{
   HW_WRITE_LOCK()
      {
	 GLint x1;
	 GLint n1;
	 LOCAL_VARS;

	 y = Y_FLIP(y);

	 HW_WRITE_CLIPLOOP()
	    {
	       GLint i = 0;
	       CLIPSPAN(x,y,n,x1,n1,i);

	       if (DBG) fprintf(stderr, "WriteRGBSpan %d..%d (x1 %d)\n",
				(int)i, (int)n1, (int)x1);

	       if (mask)
	       {
		  for (;n1>0;i++,x1++,n1--)
		     if (mask[i])
			WRITE_RGBA( x1, y, rgb[i][0], rgb[i][1], rgb[i][2], 255 );
	       }
	       else
	       {
		  for (;n1>0;i++,x1++,n1--)
		     WRITE_RGBA( x1, y, rgb[i][0], rgb[i][1], rgb[i][2], 255 );
	       }
	    }
	 HW_ENDCLIPLOOP();
      }
   HW_WRITE_UNLOCK();
}

static void TAG(WriteRGBAPixels)( const GLcontext *ctx,
			       GLuint n,
			       const GLint x[],
			       const GLint y[],
			       const GLubyte rgba[][4],
			       const GLubyte mask[] )
{
   HW_WRITE_LOCK()
      {
	 GLint i;
	 LOCAL_VARS;

	 if (DBG) fprintf(stderr, "WriteRGBAPixels\n");

	 HW_WRITE_CLIPLOOP()
	    {
	       for (i=0;i<n;i++)
	       {
		  if (mask[i]) {
		     const int fy = Y_FLIP(y[i]);
		     if (CLIPPIXEL(x[i],fy))
			WRITE_RGBA( x[i], fy,
				    rgba[i][0], rgba[i][1],
				    rgba[i][2], rgba[i][3] );
		  }
	       }
	    }
	 HW_ENDCLIPLOOP();
      }
   HW_WRITE_UNLOCK();
}


static void TAG(WriteMonoRGBASpan)( const GLcontext *ctx,	
				    GLuint n, GLint x, GLint y, 
				    const GLchan color[4],
				    const GLubyte mask[] )
{
   HW_WRITE_LOCK()
      {
	 GLint x1;
	 GLint n1;
	 LOCAL_VARS;
	 INIT_MONO_PIXEL(p, color);

	 y = Y_FLIP( y );

	 if (DBG) fprintf(stderr, "WriteMonoRGBASpan\n");

	 HW_WRITE_CLIPLOOP()
	    {
	       GLint i = 0;
	       CLIPSPAN(x,y,n,x1,n1,i);
	       for (;n1>0;i++,x1++,n1--)
		  if (mask[i])
		     WRITE_PIXEL( x1, y, p );
	    }
	 HW_ENDCLIPLOOP();
      }
   HW_WRITE_UNLOCK();
}


static void TAG(WriteMonoRGBAPixels)( const GLcontext *ctx,
				      GLuint n,
				      const GLint x[], const GLint y[],
				      const GLchan color[],
				      const GLubyte mask[] ) 
{
   HW_WRITE_LOCK()
      {
	 GLint i;
	 LOCAL_VARS;
	 INIT_MONO_PIXEL(p, color);

	 if (DBG) fprintf(stderr, "WriteMonoRGBAPixels\n");

	 HW_WRITE_CLIPLOOP()
	    {
	       for (i=0;i<n;i++)
		  if (mask[i]) {
		     int fy = Y_FLIP(y[i]);
		     if (CLIPPIXEL( x[i], fy ))
			WRITE_PIXEL( x[i], fy, p );
		  }
	    }
	 HW_ENDCLIPLOOP();
      }
   HW_WRITE_UNLOCK();
}


static void TAG(ReadRGBASpan)( const GLcontext *ctx,
			       GLuint n, GLint x, GLint y,
			       GLubyte rgba[][4])
{
   HW_READ_LOCK()
      {
	 GLint x1,n1;
	 LOCAL_VARS;

	 y = Y_FLIP(y);

	 if (DBG) fprintf(stderr, "ReadRGBASpan\n");

	 HW_READ_CLIPLOOP()
	    {
	       GLint i = 0;
	       CLIPSPAN(x,y,n,x1,n1,i);
	       for (;n1>0;i++,x1++,n1--)
		  READ_RGBA( rgba[i], x1, y );
	    }
         HW_ENDCLIPLOOP();
      }
   HW_READ_UNLOCK();
}


static void TAG(ReadRGBAPixels)( const GLcontext *ctx,
				 GLuint n, const GLint x[], const GLint y[],
				 GLubyte rgba[][4], const GLubyte mask[] )
{
   HW_READ_LOCK()
      {
	 GLint i;
	 LOCAL_VARS;

	 if (DBG) fprintf(stderr, "ReadRGBAPixels\n");

	 HW_READ_CLIPLOOP()
	    {
	       for (i=0;i<n;i++)
		  if (mask[i]) {
		     int fy = Y_FLIP( y[i] );
		     if (CLIPPIXEL( x[i], fy ))
			READ_RGBA( rgba[i], x[i], fy );
		  }
	    }
	 HW_ENDCLIPLOOP();
      }
   HW_READ_UNLOCK();
}




#undef WRITE_PIXEL
#undef WRITE_RGBA
#undef READ_RGBA
#undef TAG