feat: Create shader class

editor/include/Editor.h

@@ -21,6 +21,9 @@ private:
     Engine engine;
     UI ui;
 
+    int screenWidth = 800;
+    int screenHeight = 600;
+
     void InitializeWindow();
     void InitializeImGui();
 };

editor/src/Editor.cpp

@@ -48,7 +48,7 @@ void Editor::InitializeWindow() {
     glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
     glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
 
-    window = glfwCreateWindow(1280, 720, "Editor", nullptr, nullptr);
+    window = glfwCreateWindow(screenWidth, screenHeight, "Editor", nullptr, nullptr);
     if (!window) {
         std::cerr << "Failed to create GLFW window" << std::endl;
         glfwTerminate();
@@ -56,4 +56,5 @@ void Editor::InitializeWindow() {
     }
 
     glfwMakeContextCurrent(window);
+    glfwSetFramebufferSizeCallback(window, Engine::FramebufferSizeCallback);
 }

engine/include/Engine.h

@@ -10,6 +10,8 @@ public:
     Engine();
     ~Engine();
 
+    static void FramebufferSizeCallback(GLFWwindow* window, int width, int height);
+
     void Initialize(GLFWwindow* window);
     void Render();
     void Shutdown();

engine/include/Graphics.h

@@ -2,6 +2,7 @@
 #define GRAPHICS_H
 
 #include <GLFW/glfw3.h>
+#include "Shader.h"
 
 class Graphics
 {
@@ -9,14 +10,18 @@ public:
     Graphics();
     ~Graphics();
 
+    static void FramebufferSizeCallback(GLFWwindow* window, int width, int height);
+
     void Initialize(GLFWwindow* window);
     void Render();
     void Shutdown();
 
 private:
     GLFWwindow* window;
+    Shader shader;
     unsigned int VAO, VBO;
 
+    void LoadShaders();
     void SetupBuffers();
 };
 

engine/include/Shader.h

@@ -0,0 +1,28 @@
+#ifndef SHADER_H
+#define SHADER_H
+
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+class Shader
+{
+public:
+    Shader();
+    Shader(const char* vPath, const char* fPath);
+    ~Shader();
+
+    void Use();
+
+    unsigned int GetID();
+
+    void SetBool(const char* name, bool value) const;
+    void SetInt(const char* name, int value) const;
+    void SetFloat(const char* name, float value) const;
+    void SetMat4(const char* name, glm::mat4 value) const;
+
+private:
+    unsigned int ID;
+};
+
+#endif

engine/resources/shaders/shader.fs

@@ -0,0 +1,9 @@
+#version 330 core
+out vec4 fragColor;
+
+in vec3 ourColor;
+
+void main()
+{
+    fragColor = vec4(ourColor, 1.0f);
+}

engine/resources/shaders/shader.vs

@@ -0,0 +1,11 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aColor;
+
+out vec3 ourColor;
+
+void main()
+{
+    gl_Position = vec4(aPos, 1.0f);
+    ourColor = aColor;
+}

engine/src/Engine.cpp

@@ -7,6 +7,11 @@ Engine::~Engine()
     Shutdown();
 }
 
+void Engine::FramebufferSizeCallback(GLFWwindow* window, int width, int height)
+{
+    Graphics::FramebufferSizeCallback(window, width, height);
+}
+
 void Engine::Initialize(GLFWwindow* window)
 {
     graphics.Initialize(window);

engine/src/Graphics.cpp

@@ -1,6 +1,7 @@
 #include <glad/glad.h>
 #include <iostream>
 #include "Graphics.h"
+#include "Shader.h"
 
 Graphics::Graphics() : window(nullptr), VAO(0), VBO(0) {}
 
@@ -18,15 +19,21 @@ void Graphics::Initialize(GLFWwindow* window)
         return;
     }
 
+    LoadShaders();
     SetupBuffers();
 }
 
+void Graphics::LoadShaders()
+{
+    shader = Shader(RESOURCES_PATH"shaders/shader.vs", RESOURCES_PATH"shaders/shader.fs");
+}
+
 void Graphics::SetupBuffers()
 {
     float vertices[] = {
-        0.0f,  0.5f, 0.0f,
-        -0.5f, -0.5f, 0.0f,
-        0.5f, -0.5f, 0.0f
+         0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f,
+        -0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f,
+         0.0f,  0.5f, 0.0f, 0.0f, 0.0f, 1.0f
     };
 
     glGenVertexArrays(1, &VAO);
@@ -37,16 +44,25 @@ void Graphics::SetupBuffers()
     glBindBuffer(GL_ARRAY_BUFFER, VBO);
     glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
 
-    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)0);
     glEnableVertexAttribArray(0);
 
+    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)(3 * sizeof(float)));
+    glEnableVertexAttribArray(1);
+
     glBindBuffer(GL_ARRAY_BUFFER, 0);
     glBindVertexArray(0);
 }
 
+void Graphics::FramebufferSizeCallback(GLFWwindow* window, int width, int height)
+{
+    glViewport(0, 0, width, height);
+}
+
 void Graphics::Render() {
     glClear(GL_COLOR_BUFFER_BIT);
 
+    shader.Use();
     glBindVertexArray(VAO);
     glDrawArrays(GL_TRIANGLES, 0, 3);
 }

engine/src/Shader.cpp

@@ -0,0 +1,110 @@
+#include <glad/glad.h>
+#include <sstream>
+#include <fstream>
+#include <iostream>
+#include "Shader.h"
+
+Shader::Shader(): ID(0){}
+
+Shader::Shader(const char* vPath, const char* fPath)
+{
+    std::string vCode;
+    std::string fCode;
+    std::ifstream vShaderFile;
+    std::ifstream fShaderFile;
+
+    vShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
+    fShaderFile.exceptions (std::ifstream::failbit | std::ifstream::badbit);
+    try
+    {
+        vShaderFile.open(vPath);
+        fShaderFile.open(fPath);
+        std::stringstream vShaderStream, fShaderStream;
+
+        vShaderStream << vShaderFile.rdbuf();
+        fShaderStream << fShaderFile.rdbuf();
+
+        vShaderFile.close();
+        fShaderFile.close();
+
+        vCode = vShaderStream.str();
+        fCode = fShaderStream.str();
+    }
+    catch(std::ifstream::failure& e)
+    {
+        std::cerr << "ERROR::SHADER::FILE_NOT_SUCCESFULLY_READ::" << e.what() << std::endl;
+        std::cerr << "VPATH::" << vPath << std::endl << "FPATH::" << fPath << std::endl;
+    }
+    const char* vShaderCode = vCode.c_str();
+    const char* fShaderCode = fCode.c_str();
+
+    unsigned int vertex, fragment;
+    int success;
+    char infoLog[512];
+
+    vertex = glCreateShader(GL_VERTEX_SHADER);
+    glShaderSource(vertex, 1, &vShaderCode, nullptr);
+    glCompileShader(vertex);
+
+    glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);
+    if(!success)
+    {
+        glGetShaderInfoLog(vertex, 512, nullptr, infoLog);
+        std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED\n" << infoLog << std::endl;
+    };
+
+    fragment = glCreateShader(GL_FRAGMENT_SHADER);
+    glShaderSource(fragment, 1, &fShaderCode, nullptr);
+    glCompileShader(fragment);
+
+    glGetShaderiv(fragment, GL_COMPILE_STATUS, &success);
+    if(!success)
+    {
+        glGetShaderInfoLog(fragment, 512, nullptr, infoLog);
+        std::cerr << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED\n" << infoLog << std::endl;
+    };
+
+    ID = glCreateProgram();
+    glAttachShader(ID, vertex);
+    glAttachShader(ID, fragment);
+    glLinkProgram(ID);
+
+    glGetProgramiv(ID, GL_LINK_STATUS, &success);
+    if(!success)
+    {
+        glGetProgramInfoLog(ID, 512, nullptr, infoLog);
+        std::cerr << "ERROR::SHADER::PROGRAM::LINKING_FAILED\n" << infoLog << std::endl;
+    }
+
+    glDeleteShader(vertex);
+    glDeleteShader(fragment);
+}
+
+Shader::~Shader(){};
+
+void Shader::Use()
+{
+    glUseProgram(ID);
+}
+
+unsigned int Shader::GetID()
+{
+    return ID;
+}
+
+void Shader::SetBool(const char* name, bool value) const
+{
+    glUniform1i(glGetUniformLocation(ID, name), (int)value);
+}
+void Shader::SetInt(const char* name, int value) const
+{
+    glUniform1i(glGetUniformLocation(ID, name), value);
+}
+void Shader::SetFloat(const char* name, float value) const
+{
+    glUniform1f(glGetUniformLocation(ID, name), value);
+}
+void Shader::SetMat4(const char* name, glm::mat4 value) const
+{
+    glUniformMatrix4fv(glGetUniformLocation(ID, name), 1, GL_FALSE, glm::value_ptr(value));
+}