Qualcomm Software Development Engineer interview questions

Find the first non repeating character from a string A coding question was required to solve at the given time

Consider the following 3D scene representing an old town's main square: • A single statue o static geometry, high polygon count o low complexity fragment shader • A particle system simulating smoke o animated, rendered as a large set of points • A small set of characters o animated geometry, medium polygon count o medium complexity fragment shader • A large set of buildings o static geometry, low polygon count o low complexity fragment shader • A background image/skybox • The camera/viewpoint is continuously moving within the scene. How would you render the statue - by itself – using OpenGL to achieve maximum vertex performance (vertices/second)? How would you render the particle system - by itself - using OpenGL to achieve maximum vertex performance (vertices/second)? How would you render the scene - as a whole - most efficiently on a GPU using OpenGL? Given that the 3D scene was being rendered correctly but that you wanted to improve the performance further, how would you determine if the main performance limitation/bottleneck was located in the application, in the vertex processing stage, or in the fragment processing stage?