Shader support

shader.cpp

#include <shader.hpp>
#include <iostream>

namespace Graphic {

Shader::Shader(const char *vs, const char *fs) {
	vertexShaderID = glCreateShader(GL_VERTEX_SHADER);
	glShaderSource(vertexShaderID, 1, &vs, NULL);
	glCompileShader(vertexShaderID);
	printLog(vertexShaderID);
	fragmentShaderID = glCreateShader(GL_FRAGMENT_SHADER);
	glShaderSource(fragmentShaderID, 1, &fs, NULL);
	glCompileShader(fragmentShaderID);
	printLog(fragmentShaderID);
	shaderProgramID = glCreateProgram();
	glAttachShader(shaderProgramID, vertexShaderID);
	glAttachShader(shaderProgramID, fragmentShaderID);
	glLinkProgram(shaderProgramID);
	printLog(shaderProgramID);
}

GLint Shader::getUniformLocation(const char *loc) {
	GLint result = glGetUniformLocation(shaderProgramID, loc);
	return result;
}

Shader::~Shader() {
	glDeleteShader(vertexShaderID);
	glDeleteShader(fragmentShaderID);
	glDeleteProgram(shaderProgramID);
}

void Shader::printLog(GLuint obj)
{
    int infologLength = 0;
    char infoLog[1024];

	if (glIsShader(obj))
		glGetShaderInfoLog(obj, 1024, &infologLength, infoLog);
	else
		glGetProgramInfoLog(obj, 1024, &infologLength, infoLog);

    if (infologLength > 0)
		std::cout << infoLog << std::endl;
}

}

shader.hpp

#ifndef SHADER_HPP_
#define SHADER_HPP_

#include <GL/glew.h>

namespace Graphic {
/**
 * Shader program support.
 */
class Shader {
private:
	/**
	 * Vertex shader identifier.
	 */
	GLuint vertexShaderID;
	/**
	 * Fragment shader identifier.
	 */
	GLuint fragmentShaderID;
	/**
	 * Shader program identifier.
	 */
	GLuint shaderProgramID;
public:
	/**
	 * Constructor.
	 * @param vs Vertex shader.
	 * @param fs Fragment shader.
	 */
	Shader(const char *vs, const char *fs);

	/**
	 * Set the program to be used.
	 */
	inline void use() {
		glUseProgram(shaderProgramID);
	}

	/**
	 * Provide access to a uniform variable.
	 * @param loc Variable location name.
	 * @return Variable identifier.
	 */
	GLint getUniformLocation(const char *loc);

	~Shader();
private:
	void printLog(GLuint);
};

}

#endif /* SHADER_HPP_ */