122 lines
4.4 KiB
C++
122 lines
4.4 KiB
C++
#ifndef SHADER_H
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#define SHADER_H
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#include <glad/glad.h>
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#include <string>
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#include <fstream>
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#include <sstream>
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#include <iostream>
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class Shader
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{
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public:
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unsigned int ID;
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// constructor generates the shader on the fly
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// ------------------------------------------------------------------------
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Shader(const char* vertexPath, const char* fragmentPath)
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{
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// 1. retrieve the vertex/fragment source code from filePath
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std::string vertexCode;
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std::string fragmentCode;
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std::ifstream vShaderFile;
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std::ifstream fShaderFile;
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// ensure ifstream objects can throw exceptions:
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vShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
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fShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
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try
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{
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// open files
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vShaderFile.open(vertexPath);
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fShaderFile.open(fragmentPath);
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std::stringstream vShaderStream, fShaderStream;
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// read file's buffer contents into streams
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vShaderStream << vShaderFile.rdbuf();
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fShaderStream << fShaderFile.rdbuf();
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// close file handlers
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vShaderFile.close();
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fShaderFile.close();
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// convert stream into string
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vertexCode = vShaderStream.str();
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fragmentCode = fShaderStream.str();
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}
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catch (std::ifstream::failure& e)
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{
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std::cout << "ERROR::SHADER::FILE_NOT_SUCCESFULLY_READ" << std::endl;
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}
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const char* vShaderCode = vertexCode.c_str();
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const char * fShaderCode = fragmentCode.c_str();
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// 2. compile shaders
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unsigned int vertex, fragment;
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// vertex shader
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vertex = glCreateShader(GL_VERTEX_SHADER);
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glShaderSource(vertex, 1, &vShaderCode, NULL);
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glCompileShader(vertex);
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checkCompileErrors(vertex, "VERTEX");
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// fragment Shader
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fragment = glCreateShader(GL_FRAGMENT_SHADER);
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glShaderSource(fragment, 1, &fShaderCode, NULL);
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glCompileShader(fragment);
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checkCompileErrors(fragment, "FRAGMENT");
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// shader Program
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ID = glCreateProgram();
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glAttachShader(ID, vertex);
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glAttachShader(ID, fragment);
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glLinkProgram(ID);
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checkCompileErrors(ID, "PROGRAM");
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// delete the shaders as they're linked into our program now and no longer necessary
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glDeleteShader(vertex);
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glDeleteShader(fragment);
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}
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// activate the shader
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// ------------------------------------------------------------------------
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void use()
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{
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glUseProgram(ID);
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}
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// utility uniform functions
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// ------------------------------------------------------------------------
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void setBool(const std::string &name, bool value) const
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{
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glUniform1i(glGetUniformLocation(ID, name.c_str()), (int)value);
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}
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// ------------------------------------------------------------------------
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void setInt(const std::string &name, int value) const
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{
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glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
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}
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// ------------------------------------------------------------------------
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void setFloat(const std::string &name, float value) const
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{
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glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
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}
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private:
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// utility function for checking shader compilation/linking errors.
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// ------------------------------------------------------------------------
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void checkCompileErrors(unsigned int shader, std::string type)
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{
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int success;
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char infoLog[1024];
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if (type != "PROGRAM")
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{
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glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
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if (!success)
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{
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glGetShaderInfoLog(shader, 1024, NULL, infoLog);
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std::cout << "ERROR::SHADER_COMPILATION_ERROR of type: " << type << "\n" << infoLog << "\n -- --------------------------------------------------- -- " << std::endl;
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}
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}
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else
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{
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glGetProgramiv(shader, GL_LINK_STATUS, &success);
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if (!success)
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{
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glGetProgramInfoLog(shader, 1024, NULL, infoLog);
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std::cout << "ERROR::PROGRAM_LINKING_ERROR of type: " << type << "\n" << infoLog << "\n -- --------------------------------------------------- -- " << std::endl;
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}
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}
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}
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};
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#endif
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