glsl-basic/src/graphics.cpp

#include <exception>
#include <glad/glad.c>
// glad must be loaded before GLFW
#include "graphics.hpp"
#include "main.hpp"

#include <iostream>

using namespace std;

/* class ShaderProgram Implementations */
string ShaderProgram::baseName() {
  switch (this->base) {
  case Empty:
    return "Empty";
  case Triangle:
    return "Triangle";
  default:
    throw exception();
  }
}

ShaderProgram::ShaderProgram(Base base, char** vertexSource,
                             char** fragSource) {
  // NOTE: char arrays and char pointers are not actually the same.
  // glShaderSource requires a char[] as it appears. We pass the
  // variable by reference to avoid duplication in memory.
  BOOST_LOG_TRIVIAL(trace) << "creating empty shaders";
  this->vertex = glCreateShader(GL_VERTEX_SHADER);
  this->frag = glCreateShader(GL_FRAGMENT_SHADER);
  BOOST_LOG_TRIVIAL(trace) << "loading vertex shader";
  glShaderSource(this->vertex, 1, vertexSource,
                 NULL);
  BOOST_LOG_TRIVIAL(trace) << "compiling vertex shader";
  glCompileShader(this->vertex);
  BOOST_LOG_TRIVIAL(trace) << "loading fragments shader";
  glShaderSource(this->frag, 2, fragSource, NULL);
  BOOST_LOG_TRIVIAL(trace) << "compiling fragments shader";
  glCompileShader(this->frag);
}

int ShaderProgram::run() { return 255; }

void framebuffer_size_callback(GLFWwindow *window, int width, int height) {
  glViewport(0, 0, width, height);
}

int initGl() {
  /* graphics stuff */
  glfwInit();
  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
  // glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);

  GLFWwindow *window = glfwCreateWindow(800, 600, "Shader Loader", NULL, NULL);
  if (window == NULL) {
    printf("Failed to create GLFW window\n");
    glfwTerminate();
    return EXIT_GL;
  }
  glfwMakeContextCurrent(window);

  if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)) {
    printf("Failed to initialize GLAD\n");
    return EXIT_GL;
  }

  glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
  return 0;
}

int mainWindow(ShaderProgram *shaderProgram) {

  int result = shaderProgram->run();

  glfwTerminate();
  return result;
}