Added own shaders

src/Shader.cpp

@@ -0,0 +1,78 @@
+#include <fstream>
+#include <iostream>
+#include "Shader.hpp"
+
+Shader::Shader(const char* vertexShaderFileName, const char* fragmentShaderFileName) {
+    shaderId = createShader(vertexShaderFileName, fragmentShaderFileName);
+}
+
+Shader::~Shader() {
+    glDeleteProgram(shaderId);
+}
+
+void Shader::bind() {
+    glUseProgram(shaderId);
+}
+
+void Shader::unbind() {
+    glUseProgram(0);
+}
+
+GLuint Shader::compile(std::string shaderSource, GLenum shaderType) {
+    GLuint id = glCreateShader(shaderType);
+    const char* src = shaderSource.c_str();
+    glShaderSource(id, 1, &src, nullptr);
+    glCompileShader(id);
+
+    int result;
+    glGetShaderiv(id, GL_COMPILE_STATUS, &result);
+    if (result == GL_FALSE) {
+        int length = 0;
+        glGetShaderiv(id, GL_INFO_LOG_LENGTH, &length);
+        char* message = new char[length];
+        glGetShaderInfoLog(id, length, &length, message);
+        std::cout << "Shader Compilation Error" << message << std::endl;
+        delete[] message;
+        return 0;
+    }
+    return id;
+}
+
+std::string Shader::parse(const char* filename) {
+    FILE* file;
+    file = fopen(filename, "rb");
+    if (file == nullptr) {
+        std::cout << "File " << filename << " not found" << std::endl;
+    }
+    std::string contents;
+    fseek(file, 0, SEEK_END);
+    size_t filesize = ftell(file);
+    rewind(file);
+    contents.resize(filesize);
+    fread(&contents[0], 1, filesize, file);
+    fclose(file);
+
+    return contents;
+}
+
+GLuint Shader::createShader(const char* vertexShaderFileName, const char* fragmentShaderFileName) {
+    std::string vertexShaderSource = parse(vertexShaderFileName);
+    std::string fragmentShaderSource = parse(fragmentShaderFileName);
+
+    GLuint program = glCreateProgram();
+    GLuint vert = compile(vertexShaderSource, GL_VERTEX_SHADER);
+    GLuint frag = compile(fragmentShaderSource, GL_FRAGMENT_SHADER);
+
+    glAttachShader(program, vert);
+    glAttachShader(program, frag);
+    glLinkProgram(program);
+
+    // ATTENTION: use only for release
+    // NOTE: if you do not detach and delete the program from the gpu, it's easier to debug if errors happen with the shaders
+    // glDetachShader(program, vert);
+    // glDetachShader(program, frag);
+    // glDeleteShader(vert);
+    // glDeleteShader(frag);
+
+    return program;
+}