Can't set uniform value in OpenGL shader

Question

I am currently learning OpenGL programming, and I have made some good progress, but I seem to be stuck now.

Currently, I am trying to get simple shaders to work. To be m

Answer 1

Are you calling glUseProgram before setting the uniforms ? A full working listing can be found in many examples online, including what I had written sometime back (https://github.com/prabindh/sgxperf/blob/master/sgxperf_gles20_vg.cpp) that shows the sequence to be:

glCreateProgram();

glAttachShader()

glLinkProgram

glUseProgram()

glGetUniformLocation()

glUniformMatrix4fv