Calculate the result of blending the following colors, assuming that source blending factor is equal to source color's alpha value and sum of source and destination blending factors is one (write down the calculation steps). (a) (5 points) destination = glColor4f(0.1, 0.2, 0.8, 0.5), source = glColor4f(0.7, 0.3, 0.1, 0.3) (b) (10 points) There are four layers: 1, 2, 3, and 4. The ith layer is the destination for (i+1)st layer. Layer 1 = glColor4f(0.3, 0.3, 0.3, 0.1) Layer 2 = glColor4f(0.7, 0.1, 1.0, 0.8) Layer 3 = glColor4f(0.1, 0.3, 0.5, 0.6) Layer 4 = glColor4f(0.9, 0.6, 0.4, 0.4)