Initial commit

src/classes/Shader.cpp

@@ -0,0 +1,122 @@
+#include "Shader.h"
+#include "debug.h"
+#include <fstream>
+#include <ostream>
+#include <sstream>
+
+using namespace std;
+
+Shader::Shader(const char *vertexPath, const char *fragmentPath) {
+    // Retreive the vertex/fragment source code from the filepath.
+    string vertexCode;
+    string fragmentCode;
+    ifstream vertexShaderFile;
+    ifstream fragmentShaderFile;
+
+    // Ensure ifstream objects can throw exceptions.
+    vertexShaderFile.exceptions(ifstream::failbit | ifstream::badbit);
+    fragmentShaderFile.exceptions(ifstream::failbit | ifstream::badbit);
+
+    try {
+        // Open files.
+        LogInfo("Opening files.");
+
+        vertexShaderFile.open(vertexPath);
+        LogInfo(vertexShaderFile.is_open() ? "true" : "false");
+        fragmentShaderFile.open(fragmentPath);
+        LogInfo(fragmentShaderFile.is_open() ? "true" : "false");
+
+        stringstream vertexShaderStream;
+        stringstream fragmentShaderStream;
+
+        // Read file's buffer contents into streams.
+        LogInfo("Reading file contents into streams.");
+        vertexShaderStream << vertexShaderFile.rdbuf();
+        fragmentShaderStream << fragmentShaderFile.rdbuf();
+
+        // Close the file handlers.
+        LogInfo("Closing file handles.");
+        vertexShaderFile.close();
+        fragmentShaderFile.close();
+
+        // Convert the stream into string.
+        LogInfo("Converting the stream into string.");
+        vertexCode = vertexShaderStream.str();
+        fragmentCode = fragmentShaderStream.str();
+
+    } catch (std::ifstream::failure e) {
+        cout << "ERROR::SHADER::FILE_NOT_SUCCESFULLY_READ:\n"
+             << "what - " << e.what() << "\n"
+             << "code - " << e.code() << endl;
+    }
+
+    // Compile Shaders.
+    const char *vertexShaderCode = vertexCode.c_str();
+    const char *fragmentShaderCode = fragmentCode.c_str();
+    unsigned int vertex, fragment;
+
+    // Vertex shader.
+    vertex = glCreateShader(GL_VERTEX_SHADER);
+    glShaderSource(vertex, 1, &vertexShaderCode, NULL);
+    glCompileShader(vertex);
+    checkCompileErrors(vertex, "VERTEX");
+
+    // Fragment Shaders.
+    fragment = glCreateShader(GL_FRAGMENT_SHADER);
+    glShaderSource(fragment, 1, &fragmentShaderCode, NULL);
+    glCompileShader(fragment);
+    checkCompileErrors(fragment, "FRAGMENT");
+
+    // Shader Program.
+    ID = glCreateProgram();
+    glAttachShader(ID, vertex);
+    glAttachShader(ID, fragment);
+    glLinkProgram(ID);
+    checkCompileErrors(ID, "PROGRAM");
+
+    // Shaders no longer needed after linking.
+    glDeleteShader(vertex);
+    glDeleteShader(fragment);
+}
+
+void Shader::Activate() { glUseProgram(ID); }
+
+void Shader::Delete() { glDeleteProgram(ID); }
+
+void Shader::setBool(const string &name, bool value) const {
+    glUniform1i(glGetUniformLocation(ID, name.c_str()), (int)value);
+}
+
+void Shader::setInt(const string &name, int value) const {
+    glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
+}
+
+void Shader::setFloat(const string &name, float value) const {
+    glUniform1i(glGetUniformLocation(ID, name.c_str()), value);
+}
+
+void Shader::checkCompileErrors(unsigned int shader, string type) {
+    int success;
+    char infoLog[1024];
+    if (type != "PROGRAM") {
+        glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
+        if (!success) {
+            glGetShaderInfoLog(shader, 1024, NULL, infoLog);
+            cout << "ERROR::SHADER_COMPILATION_ERROR of type: " << type << "\n"
+                 << infoLog
+                 << "\n -- --------------------------------------------------- "
+                    "-- "
+                 << endl;
+        }
+    } else {
+        glGetProgramiv(shader, GL_LINK_STATUS, &success);
+        if (!success) {
+            glGetProgramInfoLog(shader, 1024, NULL, infoLog);
+            cout << "ERROR::PROGRAM_LINKING_ERROR of type: " << type << "\n"
+                 << infoLog
+                 << "\n -- --------------------------------------------------- "
+                    "-- "
+                 << endl;
+        }
+    }
+}