Example/Program Interface Non Block Uniforms
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Iteration over all non-block uniform variables, fetching their names, types, and locations:
GLint numUniforms = 0;
glGetProgramInterfaceiv(prog, GL_UNIFORM, GL_ACTIVE_RESOURCES, &numUniforms);
const GLenum properties[4] = {GL_BLOCK_INDEX, GL_TYPE, GL_NAME_LENGTH, GL_LOCATION};
for(int unif = 0; unif < numUniforms; ++unif)
{
GLint values[4];
glGetProgramResourceiv(prog, GL_UNIFORM, unif, 4, properties, 4, NULL, values);
// Skip any uniforms that are in a block.
if(values[0] != -1)
continue;
// Get the name. Must use a std::vector rather than a std::string for C++03 standards issues.
// C++11 would let you use a std::string directly.
std::vector<char> nameData(values[2]);
glGetProgramResourceName(prog, GL_UNIFORM, unif, nameData.size(), NULL, &nameData[0]);
std::string name(nameData.begin(), nameData.end() - 1);
}