I use this to split string by a delimiter. The first puts the results in a pre-constructed vector, the second returns a new vector.
#include <string>
#include <sstream>
#include <vector>
#include <iterator>
template <typename Out>
void split(const std::string &s, char delim, Out result) {
std::istringstream iss(s);
std::string item;
while (std::getline(iss, item, delim)) {
*result++ = item;
}
}
std::vector<std::string> split(const std::string &s, char delim) {
std::vector<std::string> elems;
split(s, delim, std::back_inserter(elems));
return elems;
}
Note that this solution does not skip empty tokens, so the following will find 4 items, one of which is empty:
std::vector<std::string> x = split("one:two::three", ':');
Variables shared between both examples:
GLint i;
GLint count;
GLint size; // size of the variable
GLenum type; // type of the variable (float, vec3 or mat4, etc)
const GLsizei bufSize = 16; // maximum name length
GLchar name[bufSize]; // variable name in GLSL
GLsizei length; // name length
Attributes
glGetProgramiv(program, GL_ACTIVE_ATTRIBUTES, &count);
printf("Active Attributes: %d\n", count);
for (i = 0; i < count; i++)
{
glGetActiveAttrib(program, (GLuint)i, bufSize, &length, &size, &type, name);
printf("Attribute #%d Type: %u Name: %s\n", i, type, name);
}
Uniforms
glGetProgramiv(program, GL_ACTIVE_UNIFORMS, &count);
printf("Active Uniforms: %d\n", count);
for (i = 0; i < count; i++)
{
glGetActiveUniform(program, (GLuint)i, bufSize, &length, &size, &type, name);
printf("Uniform #%d Type: %u Name: %s\n", i, type, name);
}
OpenGL Documentation / Variable Types
The various macros representing variable types can be found in the
docs. Such as GL_FLOAT
, GL_FLOAT_VEC3
, GL_FLOAT_MAT4
, etc.
Best Answer
You can also iterate through each parameter by doing the following: