engineer-thesis-WUT/breakout/shader.cpp

// Copyright [2023] Krzysztof Rudnicki
#ifndef HOME_KUCHY_ENGINEER_THESIS_WUT_BREAKOUT_SHADER_CPP
#define HOME_KUCHY_ENGINEER_THESIS_WUT_BREAKOUT_SHADER_CPP
#include "../breakout/shader.hpp"

auto Shader::Use() -> Shader & {
  glUseProgram(this->ID);
  return *this;
}

void Shader::Compile(const char *vertexSource, const char *fragmentSource,
                     const char *geometrySource) {
  unsigned int sVertex;
  unsigned int sFragment;
  unsigned int gShader;
  // vertex Shader
  sVertex = glCreateShader(GL_VERTEX_SHADER);
  glShaderSource(sVertex, 1, &vertexSource, nullptr);
  glCompileShader(sVertex);
  checkCompileErrors(sVertex, "VERTEX");
  // fragment Shader
  sFragment = glCreateShader(GL_FRAGMENT_SHADER);
  glShaderSource(sFragment, 1, &fragmentSource, nullptr);
  glCompileShader(sFragment);
  checkCompileErrors(sFragment, "FRAGMENT");
  // if geometry shader source code is given, also compile geometry shader
  if (geometrySource != nullptr) {
    gShader = glCreateShader(GL_GEOMETRY_SHADER);
    glShaderSource(gShader, 1, &geometrySource, nullptr);
    glCompileShader(gShader);
    checkCompileErrors(gShader, "GEOMETRY");
  }
  // shader program
  this->ID = glCreateProgram();
  glAttachShader(this->ID, sVertex);
  glAttachShader(this->ID, sFragment);
  if (geometrySource != nullptr) {
    glAttachShader(this->ID, gShader);
  }
  glLinkProgram(this->ID);
  checkCompileErrors(this->ID, "PROGRAM");
  // delete the shaders as they're linked into our
  // program now and no longer necessary
  glDeleteShader(sVertex);
  glDeleteShader(sFragment);
  if (geometrySource != nullptr) {
    glDeleteShader(gShader);
  }
}

void Shader::SetFloat(const char *name, float value, bool useShader) {
  if (useShader) {
    this->Use();
  }
  glUniform1f(glGetUniformLocation(this->ID, name), value);
}
void Shader::SetInteger(const char *name, int value, bool useShader) {
  if (useShader) {
    this->Use();
  }
  glUniform1i(glGetUniformLocation(this->ID, name), value);
}
void Shader::SetVector2f(const char *name, float x, float y, bool useShader) {
  if (useShader) {
    this->Use();
  }
  glUniform2f(glGetUniformLocation(this->ID, name), x, y);
}
void Shader::SetVector2f(const char *name, const glm::vec2 &value,
                         bool useShader) {
  if (useShader) {
    this->Use();
  }
  glUniform2f(glGetUniformLocation(this->ID, name), value.x, value.y);
}
void Shader::SetVector3f(const char *name, float x, float y, float z,
                         bool useShader) {
  if (useShader) {
    this->Use();
  }
  glUniform3f(glGetUniformLocation(this->ID, name), x, y, z);
}
void Shader::SetVector3f(const char *name, const glm::vec3 &value,
                         bool useShader) {
  if (useShader) {
    this->Use();
  }
  glUniform3f(glGetUniformLocation(this->ID, name), value.x, value.y, value.z);
}
void Shader::SetVector4f(const char *name, float x, float y, float z, float w,
                         bool useShader) {
  if (useShader) {
    this->Use();
  }
  glUniform4f(glGetUniformLocation(this->ID, name), x, y, z, w);
}
void Shader::SetVector4f(const char *name, const glm::vec4 &value,
                         bool useShader) {
  if (useShader) {
    this->Use();
  }
  glUniform4f(glGetUniformLocation(this->ID, name), value.x, value.y, value.z,
              value.w);
}
void Shader::SetMatrix4(const char *name, const glm::mat4 &matrix,
                        bool useShader) {
  if (useShader) {
    this->Use();
  }
  glUniformMatrix4fv(glGetUniformLocation(this->ID, name), 1, 0u,
                     glm::value_ptr(matrix));
}

void Shader::checkCompileErrors(unsigned int object, const std::string &type) {
  int success = 0;
  char infoLog[1024];
  if (type != "PROGRAM") {
    glGetShaderiv(object, GL_COMPILE_STATUS, &success);
    if (success == 0) {
      glGetShaderInfoLog(object, 1024, nullptr, infoLog);
      std::cout
          << "| ERROR::SHADER: Compile-time error: Type: " << type << "\n"
          << infoLog
          << "\n -- --------------------------------------------------- -- "
          << std::endl;
    }
  } else {
    glGetProgramiv(object, GL_LINK_STATUS, &success);
    if (success == 0) {
      glGetProgramInfoLog(object, 1024, nullptr, infoLog);
      std::cout
          << "| ERROR::Shader: Link-time error: Type: " << type << "\n"
          << infoLog
          << "\n -- --------------------------------------------------- -- "
          << std::endl;
    }
  }
}

#endif