GLint get_uniform_location(GLuint glsl_program_num, const std::string &prefix, const std::string &key);
void set_uniform_int(GLuint glsl_program_num, const std::string &prefix, const std::string &key, int value);
void set_uniform_float(GLuint glsl_program_num, const std::string &prefix, const std::string &key, float value);
void set_uniform_vec2(GLuint glsl_program_num, const std::string &prefix, const std::string &key, const float *values);
void set_uniform_vec3(GLuint glsl_program_num, const std::string &prefix, const std::string &key, const float *values);
void set_uniform_vec4(GLuint glsl_program_num, const std::string &prefix, const std::string &key, const float *values);
GLint get_uniform_location(GLuint glsl_program_num, const std::string &prefix, const std::string &key);
void set_uniform_int(GLuint glsl_program_num, const std::string &prefix, const std::string &key, int value);
void set_uniform_float(GLuint glsl_program_num, const std::string &prefix, const std::string &key, float value);
void set_uniform_vec2(GLuint glsl_program_num, const std::string &prefix, const std::string &key, const float *values);
void set_uniform_vec3(GLuint glsl_program_num, const std::string &prefix, const std::string &key, const float *values);
void set_uniform_vec4(GLuint glsl_program_num, const std::string &prefix, const std::string &key, const float *values);