Implement LearnOpenGL::Shader
This commit is contained in:
200
src/LearnOpenGL/Shader.cpp
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200
src/LearnOpenGL/Shader.cpp
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#include <LearnOpenGL/Shader.h>
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namespace LearnOpenGL
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{
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Shader::Shader(std::filesystem::path vertexProgramPath, std::filesystem::path fragmentProgramPath) {
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std::string vertexCode;
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std::string fragmentCode;
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std::string geometryCode;
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std::ifstream vShaderFile;
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std::ifstream fShaderFile;
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std::ifstream gShaderFile;
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vShaderFile.exceptions(std::ifstream::failbit | std::ifstream::badbit);
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vShaderFile.exceptions(std::ifstream::failbit | std::ifstream::badbit);
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vShaderFile.exceptions(std::ifstream::failbit | std::ifstream::badbit);
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try { // Open Files
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vShaderFile.open(vertexProgramPath);
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fShaderFile.open(fragmentProgramPath);
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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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if (false)
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{
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gShaderFile.open("");
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std::stringstream gShaderStream;
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gShaderStream << gShaderFile.rdbuf();
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gShaderFile.close();
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geometryCode = gShaderStream.str();
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}
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} catch (std::ifstream::failure& e) {
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std::cout << "ERROR::SHADER::FILE_NOT_SUCCESSFULLY_READ: " << e.what() << 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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// if geometry shader is given, compile geometry shader
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unsigned int geometry;
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if (false)
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{
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//const char * gShaderCode = geometryCode.c_str();
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//geometry = glCreateShader(GL_GEOMETRY_SHADER);
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//glShaderSource(geometry, 1, &gShaderCode, NULL);
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//glCompileShader(geometry);
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//checkCompileErrors(geometry, "GEOMETRY");
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}
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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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if (false) // geometryPath != nullptr)
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glAttachShader(ID, geometry);
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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 are no longer necessary
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glDeleteShader(vertex);
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glDeleteShader(fragment);
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if (false) //geometryPath != nullptr)
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glDeleteShader(geometry);
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}
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Shader::Shader(std::string vertexProgramSrc, std::string fragmentProgramSrc) {
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std::string geometryCode;
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const char* vShaderCode = vertexProgramSrc.c_str();
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const char* fShaderCode = fragmentProgramSrc.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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// if geometry shader is given, compile geometry shader
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unsigned int geometry;
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if (false)
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{
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//const char * gShaderCode = geometryCode.c_str();
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//geometry = glCreateShader(GL_GEOMETRY_SHADER);
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//glShaderSource(geometry, 1, &gShaderCode, NULL);
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//glCompileShader(geometry);
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//checkCompileErrors(geometry, "GEOMETRY");
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}
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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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if (false) // geometryPath != nullptr)
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glAttachShader(ID, geometry);
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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 are no longer necessary
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glDeleteShader(vertex);
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glDeleteShader(fragment);
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if (false) //geometryPath != nullptr)
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glDeleteShader(geometry);
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}
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void Shader::use() {
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glUseProgram(ID);
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}
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void Shader::setBool(const std::string &name, bool value) const {
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glUniform1i(glGetUniformLocation(ID, name.c_str()), (int)value);
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}
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void Shader::setInt(const std::string &name, int value) const {
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glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
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}
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void Shader::setFloat(const std::string &name, float value) const {
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glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
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}
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void Shader::setVec2(const std::string &name, const Vector2 &value) const {
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glUniform2f(glGetUniformLocation(ID, name.c_str()), value.x, value.y);
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}
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void Shader::setVec2(const std::string &name, float x, float y) const {
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glUniform2f(glGetUniformLocation(ID, name.c_str()), x, y);
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}
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void Shader::setVec3(const std::string &name, const Vector3 &value) const {
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glUniform3f(glGetUniformLocation(ID, name.c_str()), value.x, value.y, value.z);
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}
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void Shader::setVec3(const std::string &name, float x, float y, float z) const {
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glUniform3f(glGetUniformLocation(ID, name.c_str()), x, y, z);
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}
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void Shader::setVec4(const std::string &name, const Vector4 &value) const {
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glUniform4f(glGetUniformLocation(ID, name.c_str()), value.x, value.y, value.z, value.w);
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}
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void Shader::setVec4(const std::string &name, float x, float y, float z, float w) const {
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glUniform4f(glGetUniformLocation(ID, name.c_str()), x, y, z, w);
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}
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void Shader::setMat2(const std::string &name, const Matrix2x2 &mat) const {
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//glUniformMatrix2fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat.At(0, 0));
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}
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void Shader::setMat3(const std::string &name, const Matrix3x3 &mat) const {
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//glUniformMatrix3fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat.At(0, 0));
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}
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void Shader::setMat4(const std::string &name, const Matrix4x4 &mat) const {
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//glUniformMatrix4fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &mat.At(0, 0));
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}
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void Shader::checkCompileErrors(GLuint shader, std::string type) {
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GLint success;
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GLchar infoLog[1024];
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if (type != "PROGRAM") {
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glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
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if (!success) {
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glGetShaderInfoLog(shader, 1024, NULL, infoLog);
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std::cout << "ERROR::SHADER_COMPILATION_ERROR of type: " << type << "\n" << infoLog << std::endl;
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}
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} else {
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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 << std::endl;
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}
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}
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}
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Shader::Shader() {}
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}
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