shaderProgram.hpp

#ifndef SHADERPROGRAM_H
#define SHADERPROGRAM_H

#include <stdio.h>
#include <stdlib.h>

#include <glad/glad.h>
#include <GLFW/glfw3.h>

#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include <glm/glm.hpp>

#include <assimp/Importer.hpp>
#include <assimp/scene.h>
#include <assimp/postprocess.h>

// #define STB_IMAGE_IMPLEMENTATION


#include <string>
#include <fstream>
#include <sstream>
#include <iostream>

// Proveri mozda nije dobro definisana ova klasa: https://www.youtube.com/watch?v=4w7lNF8dnYw&list=PLRIWtICgwaX0u7Rf9zkZhLoLuZVfUksDP&index=5

class ShaderProgram
{
public:
    unsigned int ID;
    unsigned int vertexID, fragmentID;
    // constructor generates the shader on the fly
    // ------------------------------------------------------------------------
    ShaderProgram(const char* vertexPath, const char* fragmentPath, char* geometryPath = NULL)
    {
        std::string vertexCode;
        std::string fragmentCode;
        std::string geometryCode;
        std::ifstream vShaderFile;
        std::ifstream fShaderFile;
        std::ifstream gShaderFile;
        // ensure ifstream objects can throw exceptions:
        vShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
        fShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
        gShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
        try
        {
            // open files
            vShaderFile.open(vertexPath);
            fShaderFile.open(fragmentPath);
            std::stringstream vShaderStream, fShaderStream;
            // read file's buffer contents into streams
            vShaderStream << vShaderFile.rdbuf();
            fShaderStream << fShaderFile.rdbuf();
            // close file handlers
            vShaderFile.close();
            fShaderFile.close();
            // convert stream into string
            vertexCode = vShaderStream.str();
            fragmentCode = fShaderStream.str();
            // if geometry shader path is present, also load a geometry shader
            if(geometryPath != NULL)
            {
                gShaderFile.open(geometryPath);
                std::stringstream gShaderStream;
                gShaderStream << gShaderFile.rdbuf();
                gShaderFile.close();
                geometryCode = gShaderStream.str();
            }
        }
        catch (std::ifstream::failure e)
        {
            std::cout << "ERROR::SHADER::FILE_NOT_SUCCESFULLY_READ" << std::endl;
        }
        const char* vShaderCode = vertexCode.c_str();
        const char * fShaderCode = fragmentCode.c_str();
        // 2. compile shaders
        unsigned int vertex, fragment;
        // vertex shader
        vertex = glCreateShader(GL_VERTEX_SHADER);
        glShaderSource(vertex, 1, &vShaderCode, NULL);
        glCompileShader(vertex);
        checkCompileErrors(vertex, "VERTEX");
        // fragment Shader
        fragment = glCreateShader(GL_FRAGMENT_SHADER);
        glShaderSource(fragment, 1, &fShaderCode, NULL);
        glCompileShader(fragment);
        checkCompileErrors(fragment, "FRAGMENT");
        // if geometry shader is given, compile geometry shader
        unsigned int geometry;
        if(geometryPath != NULL)
        {
            const char * gShaderCode = geometryCode.c_str();
            geometry = glCreateShader(GL_GEOMETRY_SHADER);
            glShaderSource(geometry, 1, &gShaderCode, NULL);
            glCompileShader(geometry);
            checkCompileErrors(geometry, "GEOMETRY");
        }
        // shader Program
        ID = glCreateProgram();
        glAttachShader(ID, vertex);
        glAttachShader(ID, fragment);
        if(geometryPath != NULL)
            glAttachShader(ID, geometry);
        glLinkProgram(ID);
        checkCompileErrors(ID, "PROGRAM");
        // delete the shaders as they're linked into our program now and no longer necessery
        glDeleteShader(vertex);
        glDeleteShader(fragment);
        if(geometryPath != NULL)
            glDeleteShader(geometry);
    }

    void start()
    {
        glUseProgram(ID);
    }



    // activate the shader
    // ------------------------------------------------------------------------


    void stop() {
        glUseProgram(0);
    }

    void cleanUp() {
        stop();
        glDetachShader(ID, this->vertexID);
        glDetachShader(ID, this->fragmentID);
        glDeleteShader(this->vertexID);
        glDeleteShader(this->fragmentID);
        glDeleteProgram(ID);
    }

    void bindAttribute(int attribute, char* varriableNam) {
        glBindAttribLocation(this->ID, attribute, varriableNam);
    }

    virtual void bindAttributes() {

        glBindAttribLocation(ID, 0, "aPos");
        glBindAttribLocation(ID, 1, "aTexCoords");

    }

    // utility uniform functions
    // ------------------------------------------------------------------------
    int getUniformLocation(const char* uniformName) {

        return glGetUniformLocation(this->ID, uniformName);

    }

    // 4:00 min
    virtual void getAllUniformLocations() {

    }



    void loadFloat(int location, float value) {
        glUniform1f(location, value);
    }

    void loadVector(int location, glm::vec3 &value) {
        glUniform3fv(location, 1, &value[0]);
    }

    void loadBoolean(int location, int boolean) {
        if(boolean == 0 || boolean == 1) {
            glUniform1f(location, boolean);
        } else {
            std::cout << "Error boolean number must be in range 0 - 1.";
            exit(1);
        }
    }

    void loadMatrix(int location, const glm::mat4 &mat) const {
        glUniformMatrix4fv(location, 1, GL_FALSE, &mat[0][0]);
    }





    void setBool(const std::string &name, bool value) const
    {
        glUniform1i(glGetUniformLocation(ID, name.c_str()), (int)value);
    }
    // ------------------------------------------------------------------------
    void setInt(const std::string &name, int value) const
    {
        glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
    }
    // ------------------------------------------------------------------------
    void setFloat(const std::string &name, float value) const
    {
        glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
    }
    // ------------------------------------------------------------------------
    void setVec2(const std::string &name, const glm::vec2 &value) const
    {
        glUniform2fv(glGetUniformLocation(ID, name.c_str()), 1, &value[0]);
    }
    void setVec2(const std::string &name, float x, float y) const
    {
        glUniform2f(glGetUniformLocation(ID, name.c_str()), x, y);
    }
    // ------------------------------------------------------------------------
    void setVec3(const std::string &name, const glm::vec3 &value) const
    {
        glUniform3fv(glGetUniformLocation(ID, name.c_str()), 1, &value[0]);
    }
    void setVec3(const std::string &name, float x, float y, float z) const
    {
        glUniform3f(glGetUniformLocation(ID, name.c_str()), x, y, z);
    }
    // ------------------------------------------------------------------------
    void setVec4(const std::string &name, const glm::vec4 &value) const
    {
        glUniform4fv(glGetUniformLocation(ID, name.c_str()), 1, &value[0]);
    }
    void setVec4(const std::string &name, float x, float y, float z, float w)
    {
        glUniform4f(glGetUniformLocation(ID, name.c_str()), x, y, z, w);
    }
    // ------------------------------------------------------------------------
    void setMat2(const std::string &name, const glm::mat2 &mat) const
    {
        glUniformMatrix2fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat[0][0]);
    }
    // ------------------------------------------------------------------------
    void setMat3(const std::string &name, const glm::mat3 &mat) const
    {
        glUniformMatrix3fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat[0][0]);
    }
    // ------------------------------------------------------------------------
    void setMat4(const std::string &name, const glm::mat4 &mat) const
    {
        glUniformMatrix4fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat[0][0]);
    }

private:
    void checkCompileErrors(GLuint shader, std::string type)
    {
        GLint success;
        GLchar infoLog[1024];
        if(type != "PROGRAM")
        {
            glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
            if(!success)
            {
                glGetShaderInfoLog(shader, 1024, NULL, infoLog);
                std::cout << "ERROR::SHADER_COMPILATION_ERROR of type: " << type << "\n" << infoLog << "\n -- --------------------------------------------------- -- " << std::endl;
            }
        }
        else
        {
            glGetProgramiv(shader, GL_LINK_STATUS, &success);
            if(!success)
            {
                glGetProgramInfoLog(shader, 1024, NULL, infoLog);
                std::cout << "ERROR::PROGRAM_LINKING_ERROR of type: " << type << "\n" << infoLog << "\n -- --------------------------------------------------- -- " << std::endl;
            }
        }
    }

};

#endif // SHADERPROGRAM_H