void ContextViewport::_hbao_prepare()

in roboschool/cpp-household/render-ssao.cpp [164:230]

• 57 lines of code
• 5 McCabe index (conditional complexity)

void ContextViewport::_hbao_prepare(const float* proj_matrix)
{
#if 0
	float p1, p2, p3, testy;
	testy = 1.0;
	FILE* f = fopen("ssao.params", "rt");
	if (f) {
		int r = fscanf(f, "%f %f %f %f", &p1, &p2, &p3, &testy);
		fclose(f);
		if (r==4) {
			ssao_radius = p1;
			ssao_intensity = p2;
			ssao_bias = p3;
		}
	}
	cx->useful->hbaoUbo._pad0[0] = testy;
#endif

	const float* P = proj_matrix;

	cx->useful->hbaoUbo.projOrtho = ortho;
	float projScale;
	if (ortho) {
		cx->useful->hbaoUbo.projInfo[0] =  20.0f / ( P[4*0+0]);      // ((x) * R - L)
		cx->useful->hbaoUbo.projInfo[1] =  20.0f / ( P[4*1+1]);      // ((y) * T - B)
		cx->useful->hbaoUbo.projInfo[2] = -( 1.0f + P[4*3+0]) / P[4*0+0]; // L
		cx->useful->hbaoUbo.projInfo[3] = -( 1.0f - P[4*3+1]) / P[4*1+1]; // B
		projScale = float(side) / cx->useful->hbaoUbo.projInfo[1];
	} else {
		cx->useful->hbaoUbo.projInfo[0] =  2.0f / (P[4*0+0]);       // (x) * (R - L)/N
		cx->useful->hbaoUbo.projInfo[1] =  2.0f / (P[4*1+1]);       // (y) * (T - B)/N
		cx->useful->hbaoUbo.projInfo[2] = -( 1.0f - P[4*2+0]) / P[4*0+0]; // L/N
		cx->useful->hbaoUbo.projInfo[3] = -( 1.0f + P[4*2+1]) / P[4*1+1]; // B/N
		projScale = float(side) / (tanf(hfov * nv_to_rad * 0.5f) * 2.0f);
	}

	// radius
	float R = ssao_radius;
	cx->useful->hbaoUbo.R2 = R * R;
	cx->useful->hbaoUbo.NegInvR2 = -1.0f / cx->useful->hbaoUbo.R2;
	cx->useful->hbaoUbo.RadiusToScreen = R * 0.5f * projScale;

	// ao
	cx->useful->hbaoUbo.PowExponent = std::max(ssao_intensity, 0.0f);
	cx->useful->hbaoUbo.NDotVBias = std::min(std::max(0.0f, ssao_bias), 1.0f);
	cx->useful->hbaoUbo.AOMultiplier = 1.0f / (1.0f - cx->useful->hbaoUbo.NDotVBias);

	// resolution
	int quarterW = ((W+3)/4);
	int quarterH = ((H+3)/4);

	cx->useful->hbaoUbo.InvQuarterResolution[0] = 1.0f/float(quarterW);
	cx->useful->hbaoUbo.InvQuarterResolution[1] = 1.0f/float(quarterH);
	cx->useful->hbaoUbo.InvFullResolution[0] = 1.0f/float(W);
	cx->useful->hbaoUbo.InvFullResolution[1] = 1.0f/float(H);

	for (int i = 0; i < HBAO_RANDOM_ELEMENTS; i++){
		cx->useful->hbaoUbo.float2Offsets[4*i+0] = float(i % 4) + 0.5f;
		cx->useful->hbaoUbo.float2Offsets[4*i+1] = float(i / 4) + 0.5f;
		cx->useful->hbaoUbo.float2Offsets[4*i+2] = 0;
		cx->useful->hbaoUbo.float2Offsets[4*i+3] = 0;
		cx->useful->hbaoUbo.jitters[4*i+0] = cx->useful->hbaoRandom[i][0];
		cx->useful->hbaoUbo.jitters[4*i+1] = cx->useful->hbaoRandom[i][1];
		cx->useful->hbaoUbo.jitters[4*i+2] = cx->useful->hbaoRandom[i][2];
		cx->useful->hbaoUbo.jitters[4*i+3] = cx->useful->hbaoRandom[i][3];
	}
}