.. _program_listing_file_gui_Demeter_Renderer_Shader.cpp:

Program Listing for File Shader.cpp
===================================

|exhale_lsh| :ref:`Return to documentation for file <file_gui_Demeter_Renderer_Shader.cpp>` (``gui/Demeter/Renderer/Shader.cpp``)

.. |exhale_lsh| unicode:: U+021B0 .. UPWARDS ARROW WITH TIP LEFTWARDS

.. code-block:: cpp

   #include <array>
   #include <fstream>
   
   #include "Shader.hpp"
   #include "logging/Logger.hpp"
   
   bool Shader::Init(const std::string &path)
   {
     std::ifstream file(path);
     if (!file) {
       Log::failed << "Failed to open shader file: " << path;
       return false;
     }
     std::string data(
       (std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
     const char *src = data.c_str();
     file.close();
   
     _shader = glCreateShader(_type);
     glShaderSource(_shader, 1, &src, nullptr);
     glCompileShader(_shader);
     GLint success;
     glGetShaderiv(_shader, GL_COMPILE_STATUS, &success);
     if (!success) {
       std::array<char, 512> log;
       glGetShaderInfoLog(_shader, log.size(), nullptr, log.data());
       Log::failed << "Shader Compile Error: " << log.data();
       return false;
     }
     return true;
   }
   
   Shader::~Shader()
   {
     glDeleteShader(_shader);
   }
   
   bool ShaderProgram::Init(
     std::unique_ptr<VertexShader> vertexShader,
     std::unique_ptr<FragmentShader> fragmentShader)
   {
     vs = std::move(vertexShader);
     fs = std::move(fragmentShader);
     program = glCreateProgram();
     glAttachShader(program, vs->Get());
     glAttachShader(program, fs->Get());
     glLinkProgram(program);
     GLint success = 0;
     glGetProgramiv(program, GL_LINK_STATUS, &success);
     if (!success) {
       std::array<char, 512> log;
       glGetProgramInfoLog(program, log.size(), nullptr, log.data());
       Log::failed << "Shader Program Link Error: " << log.data();
       return false;
     }
     return true;
   }
   
   ShaderProgram::~ShaderProgram()
   {
     glDeleteProgram(program);
   }