MSAA

//Here i calculate every barycentric coordinate for every subpixel to check if it is inside triangle
float maxy = rt->curH + 1.f;
		float maxx = rt->curW + 1.f;

		float stepstart = 0.5f / rt->renderer->samplestep; //for st = 2 step is .25  for st = 4 0.125
		float step = 2.f*stepstart; //distance between

		vec3_t subpixel = {0.f, 0.f, 0.f};
		vec3_t subbc, bcsum;
		bool first = true;
		bool subsuccess;
		vec3_t *limitvec;
		for (float cury = rt->curH + stepstart; cury < maxy && cury < rt->maxy ; cury += step)
		{
			for (float curx = rt->curW + stepstart; curx < maxx && curx < rt->maxx ; curx += step)
			{
				subpixel.coords.x = curx;
				subpixel.coords.y = cury;
				//printf("subpx: %f %f\n", curx, cury);
				if ( isline(rt->shape) )
				{
					float edge = place_of_vec3(rt->pRaster[0], rt->pRaster[1], &subpixel);
					limitvec = vec3_sub_new(rt->pRaster[0], rt->pRaster[1]);
					vec3_length(limitvec);
					float limit = vec3_length(limitvec) *0.5f;
					if ( (edge <= limit && edge >= 0.f || edge >= -limit && edge <= 0.f) )
					{
						subsuccess = true;
					}
					free(limitvec);
				} else
				{
					subsuccess = is_inside_triangle( rt->pRaster[0], rt->pRaster[1], rt->pRaster[2], &subpixel, &subbc);
				}

				if(subsuccess)
				{
					if (first)
					{
						vec3_copy_dest(&bcsum,&subbc);
						first = false;
						rt->isVisible = true;
					} else
					{
						vec3_add(&bcsum,&subbc);
					}

					++rt->cntsamplesuccess;
				}
			}
		}

		if(rt->isVisible)
		{
			vec3_set_values(&rt->bc, bcsum.coords.x / rt->cntsamplesuccess,
									 bcsum.coords.y / rt->cntsamplesuccess,
									 bcsum.coords.z / rt->cntsamplesuccess);
		}

//later in the code i use this results for coloring

	if (rt->renderer->samplestep > 1.f )
	{
		float st = rt->renderer->samplestep*rt->renderer->samplestep;
		float fail = st - rt->cntsamplesuccess;

		cRGB_t subcolsucc = { curCol1.r * rt->cntsamplesuccess,
							  curCol1.g * rt->cntsamplesuccess,
							  curCol1.b * rt->cntsamplesuccess };
		cRGB_t bufcol = rt->renderer->frameBuffer[bi/*rt->bufferIndex*/];
		cRGB_t subcolfail = { bufcol.r * fail,
							  bufcol.g * fail,
							  bufcol.b * fail};
		crgb_crgb_add(&subcolsucc, &subcolfail);
		crgb_mul(&subcolsucc, 1.f/st);
		crgb_crgb_copy(&curCol1, &subcolsucc);
	}

	crgb_crgb_copy(&rt->renderer->frameBuffer[bi/*rt->bufferIndex*/], &curCol1);