Matrices and transformations

.vscode/settings.json

@@ -0,0 +1,48 @@
+{
+    "files.associations": {
+        "array": "cpp",
+        "atomic": "cpp",
+        "*.tcc": "cpp",
+        "cctype": "cpp",
+        "clocale": "cpp",
+        "cmath": "cpp",
+        "cstdarg": "cpp",
+        "cstddef": "cpp",
+        "cstdint": "cpp",
+        "cstdio": "cpp",
+        "cstdlib": "cpp",
+        "cwchar": "cpp",
+        "cwctype": "cpp",
+        "deque": "cpp",
+        "unordered_map": "cpp",
+        "vector": "cpp",
+        "exception": "cpp",
+        "algorithm": "cpp",
+        "functional": "cpp",
+        "iterator": "cpp",
+        "memory": "cpp",
+        "memory_resource": "cpp",
+        "numeric": "cpp",
+        "optional": "cpp",
+        "random": "cpp",
+        "string": "cpp",
+        "string_view": "cpp",
+        "system_error": "cpp",
+        "tuple": "cpp",
+        "type_traits": "cpp",
+        "utility": "cpp",
+        "fstream": "cpp",
+        "initializer_list": "cpp",
+        "iosfwd": "cpp",
+        "iostream": "cpp",
+        "istream": "cpp",
+        "limits": "cpp",
+        "new": "cpp",
+        "ostream": "cpp",
+        "sstream": "cpp",
+        "stdexcept": "cpp",
+        "streambuf": "cpp",
+        "cinttypes": "cpp",
+        "typeinfo": "cpp"
+    }
+}

Makefile

@@ -3,10 +3,10 @@ CFLAGS = -std=c++17 -O2
 LDFLAGS = -lglfw3 -lGL -ldl -lpthread -lX11 -lXxf86vm -lXrandr -lXi
 OUT_NAME = LearnOpenGL
 
-build: src/main.cpp  src/shader.h
+build: src/*.cpp  src/*.h
 	mkdir -p build/
-	$(CC) $(CFLAGS) -Ilib/GLAD/include -Ilib/glfw/include -o build/$(OUT_NAME) lib/GLAD/src/glad.c src/main.cpp $(LDFLAGS)
+	$(CC) $(CFLAGS) -Ilib/GLAD/include -Ilib/glfw/include -o build/$(OUT_NAME) lib/GLAD/src/glad.c src/*.cpp $(LDFLAGS)
 
 
-run: build/$(OUT_NAME)
+run: build build/$(OUT_NAME)
 	./build/$(OUT_NAME)

shader.fs

@@ -1,11 +1,12 @@
 #version 460 core
 out vec4 FragColor;
 
-in vec4 ourPosition;
 
-in vec3 ourColor;
+in vec2 TexCoord;
 
+uniform sampler2D texture1;
+uniform sampler2D texture2;
 void main()
 {
-    FragColor = ourPosition;// vec4(ourColor, 1.0f);
+    FragColor = mix(texture(texture1, TexCoord)  , texture(texture2, vec2(-TexCoord.x , TexCoord.y)), 0.2);
 }

shader.vs

@@ -1,15 +1,18 @@
 #version 460 core
 layout (location=0) in vec3 aPos;
-layout (location=1) in vec3 aColor;
+layout (location=2) in vec3 aColor;
+layout (location=1) in vec2 aTexCoord;
 
 uniform float HorizontalOffset;
 
-out vec3 ourColor;
+uniform mat4 model;
-out vec4 ourPosition;
+uniform mat4 view;
+uniform mat4 projection;
+
+out vec2 TexCoord;
 
 void main(){
 
-    gl_Position = vec4(-aPos.x + HorizontalOffset, aPos.yz , 1.0);
+    gl_Position = projection * view * model * vec4(aPos , 1.0);
-    ourColor = aColor;
+    TexCoord = aTexCoord;
-    ourPosition = gl_Position;
 }

src/main.cpp

@@ -4,6 +4,12 @@
 #include <glad/glad.h>
 #include <GLFW/glfw3.h>
 
+#include <glm/glm.hpp>
+#include <glm/gtc/matrix_transform.hpp>
+#include <glm/gtc/type_ptr.hpp>
+
+
+#include "stb_image.h"
 #include "shader.h"
 
 
@@ -18,7 +24,7 @@ void processInput( GLFWwindow* window){
 }
 
 int main() {
-   printf("Hello OpenGL!");
+   printf("Hello OpenGL!\n");
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
@@ -27,14 +33,14 @@ int main() {
 
    GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
    if( window == NULL){
-      printf("Failed to create GLFW window!");
+      printf("Failed to create GLFW window!\n");
       glfwTerminate();
       return -1; 
    }
    glfwMakeContextCurrent(window);
 
    if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)){
-      printf("Failed to initialize GLAD!");
+      printf("Failed to initialize GLAD!\n");
       return -1;
    }
 
@@ -42,26 +48,64 @@ int main() {
    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
 
 
-   glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
-
    Shader shader("shader.vs", "shader.fs");
 
 
 
 
    float vertices[] = {
-      0.5f, -0.5f, 0.0f,   1.0f, 0.0f, 0.0f, // bottom right
+    -0.5f, -0.5f, -0.5f,  0.0f, 0.0f,
-      -0.5f, -0.5f, 0.0f,  0.0f, 1.0f, 0.0f, // bottom left
+     0.5f, -0.5f, -0.5f,  1.0f, 0.0f,
-      0.0f, 0.5f, 0.0f,    0.0f, 0.0f, 1.0f  // top
+     0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
+     0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
+    -0.5f,  0.5f, -0.5f,  0.0f, 1.0f,
+    -0.5f, -0.5f, -0.5f,  0.0f, 0.0f,
+
+    -0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
+     0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
+     0.5f,  0.5f,  0.5f,  1.0f, 1.0f,
+     0.5f,  0.5f,  0.5f,  1.0f, 1.0f,
+    -0.5f,  0.5f,  0.5f,  0.0f, 1.0f,
+    -0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
+
+    -0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
+    -0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
+    -0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
+    -0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
+    -0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
+    -0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
+
+     0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
+     0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
+     0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
+     0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
+     0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
+     0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
+
+    -0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
+     0.5f, -0.5f, -0.5f,  1.0f, 1.0f,
+     0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
+     0.5f, -0.5f,  0.5f,  1.0f, 0.0f,
+    -0.5f, -0.5f,  0.5f,  0.0f, 0.0f,
+    -0.5f, -0.5f, -0.5f,  0.0f, 1.0f,
+
+    -0.5f,  0.5f, -0.5f,  0.0f, 1.0f,
+     0.5f,  0.5f, -0.5f,  1.0f, 1.0f,
+     0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
+     0.5f,  0.5f,  0.5f,  1.0f, 0.0f,
+    -0.5f,  0.5f,  0.5f,  0.0f, 0.0f,
+    -0.5f,  0.5f, -0.5f,  0.0f, 1.0f
+};
+
+  /*  unsigned int indices[] = {
+      0,1,3, // first triangle
+      1,2,3  // second triangle
+   }; */
 
-   };
   
-   unsigned int indices[] = {
-         0, 1,2 // first triangle
-   };
 
    // Vertex buffer objects!!
-   unsigned int VBO, VAO, EBO;
+  /*  unsigned int VBO, VAO, EBO;
    glGenVertexArrays(1, &VAO);
    glGenBuffers(1, &VBO);
    glGenBuffers(1, &EBO);
@@ -72,37 +116,166 @@ int main() {
    glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
 
    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
-   glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
+   glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW); */
 
-   // Position attribute
+  /*  // Position attribute
-   glVertexAttribPointer(0,3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)0);
+   glVertexAttribPointer(0,3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
    glEnableVertexAttribArray(0);
    // Color attribute
-   glVertexAttribPointer(1,3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)(3* sizeof(float)));
+   glVertexAttribPointer(1,3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3* sizeof(float)));
    glEnableVertexAttribArray(1);
 
-   glBindBuffer(GL_ARRAY_BUFFER, 0);
+   // texture attribute
+   glVertexAttribPointer(2,2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6*sizeof(float)));
+   glEnableVertexAttribArray(2); */
+
+   unsigned int VBO, VAO;
+   glGenVertexArrays(1, &VAO);
+   glGenBuffers(1, &VBO);
+
+   glBindVertexArray(VAO);
+
+   glBindBuffer(GL_ARRAY_BUFFER, VBO);
+   glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
+
+    // position attribute
+    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
+    glEnableVertexAttribArray(0);
+    // texture coord attribute
+    glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
+    glEnableVertexAttribArray(1);
+
+
+   int width, height, nrChannels;
+   unsigned int texture1;
+   glGenTextures(1, &texture1);
+   glActiveTexture(GL_TEXTURE0);
+   glBindTexture(GL_TEXTURE_2D, texture1);
+
+   glTextureParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+   glTextureParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+
+
+   unsigned char* data = stbi_load("Textures/container.jpg", &width, &height, &nrChannels,0);
+   if(data){
+      std::cout<< width << " x " << height << std::endl;
+      glTexImage2D(GL_TEXTURE_2D,0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
+      glGenerateMipmap(GL_TEXTURE_2D);
+
+   } else{
+      std::cout << "Failed to load texture!" << std::endl;
+   }
+   
+   stbi_image_free(data);
+
+
+   int width2, height2, nrChannels2;
+   unsigned int texture2;
+   glGenTextures(1, &texture2);
+
+   glActiveTexture(GL_TEXTURE1);
+   glBindTexture(GL_TEXTURE_2D, texture2);
+
+   glTextureParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+   glTextureParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+
+   stbi_set_flip_vertically_on_load(true);
+   unsigned char* data2 = stbi_load("Textures/awesomeface.png", &width2, &height2, &nrChannels2,0);
+   if(data2){
+      std::cout<< width2 << " x " << height2 << std::endl;
+      glTexImage2D(GL_TEXTURE_2D,0, GL_RGB, width2, height2, 0, GL_RGBA, GL_UNSIGNED_BYTE, data2);
+      glGenerateMipmap(GL_TEXTURE_2D);
+
+   } else{
+      std::cout << "Failed to load texture!" << std::endl;
+   }
+   
+   stbi_image_free(data2);
+
 
-   glBindVertexArray(0);
  
    // WireFrame mode
    // glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); 
 
+   
+
+   shader.use();
+   shader.setInt("texture1",0);
+   shader.setInt("texture2",1);
+  
+   glm::vec3 cubePositions[] = {
+      glm::vec3( 0.0f,  0.0f,  0.0f), 
+      glm::vec3( 2.0f,  5.0f, -15.0f), 
+      glm::vec3(-1.5f, -2.2f, -2.5f),  
+      glm::vec3(-3.8f, -2.0f, -12.3f),  
+      glm::vec3( 2.4f, -0.4f, -3.5f),  
+      glm::vec3(-1.7f,  3.0f, -7.5f),  
+      glm::vec3( 1.3f, -2.0f, -2.5f),  
+      glm::vec3( 1.5f,  2.0f, -2.5f), 
+      glm::vec3( 1.5f,  0.2f, -1.5f), 
+      glm::vec3(-1.3f,  1.0f, -1.5f)  
+   };
+
+   glEnable(GL_DEPTH_TEST);
    while(!glfwWindowShouldClose(window))
    {
       processInput(window);
       
-      glClear(GL_COLOR_BUFFER_BIT);
 
 
-      shader.use();
+      glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
-      shader.setFloat("HorizontalOffset", .3);
+      glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+
+
+      glActiveTexture(GL_TEXTURE0);
+      glBindTexture(GL_TEXTURE_2D, texture1);
+
+      glActiveTexture(GL_TEXTURE1);
+      glBindTexture(GL_TEXTURE_2D, texture2);
+
+
+       // create transformations
+        glm::mat4 model         = glm::mat4(1.0f); // make sure to initialize matrix to identity matrix first
+        glm::mat4 view          = glm::mat4(1.0f);
+        glm::mat4 projection    = glm::mat4(1.0f);
+        model = glm::rotate(model, (float)glfwGetTime(), glm::vec3(0.5f, 1.0f, 0.0f));
+        view  = glm::translate(view, glm::vec3(0.0f, 0.0f, -3.0f));
+        projection = glm::perspective(glm::radians(45.0f), (float)800 / (float)600, 0.1f, 100.0f);
+
+      
+      // Pass a matrix to the shader
+      unsigned int ModelMatrixLoc = glGetUniformLocation(shader.ID, "model");
+      glUniformMatrix4fv(ModelMatrixLoc, 1, GL_FALSE, glm::value_ptr(model));
+
+      unsigned int ViewMatrixLoc = glGetUniformLocation(shader.ID, "view");
+      glUniformMatrix4fv(ViewMatrixLoc, 1, GL_FALSE, &view[0][0]);
+      
+      unsigned int ProjectionMatrixLoc = glGetUniformLocation(shader.ID, "projection");
+      glUniformMatrix4fv(ProjectionMatrixLoc, 1, GL_FALSE, &projection[0][0]);
+
+
 
       glBindVertexArray(VAO);
-      glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
 
-      glDrawElements(GL_TRIANGLES, 6,GL_UNSIGNED_INT,  0);
+      for(unsigned int i = 0; i < 10; i++){
+         glm::mat4 model = glm::mat4(1.0);
+         model = glm::translate(model, cubePositions[i]);
+         float angle = 20.0f * i;
+         model = glm::rotate(model, (float)glfwGetTime() * glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));
+         shader.setMat4("model", model);
 
+         glDrawArrays(GL_TRIANGLES, 0, 36);
+
+      }      
 
       glfwSwapBuffers(window);
       glfwPollEvents();

src/shader.h

@@ -20,6 +20,7 @@ class Shader
         void setBool(const std::string &name, bool value)const;
         void setInt(const std::string &name, int value)const;
         void setFloat(const std::string &name, float value)const;
+        void setMat4(const std::string &name, glm::mat4 value)const;
 
 
 };
@@ -131,3 +132,7 @@ void Shader::setInt(const std::string &name, int value) const{
 void Shader::setFloat(const std::string &name, float value) const{
     glUniform1f(glGetUniformLocation(ID, name.c_str()),  value );
 }
+
+void Shader::setMat4(const std::string &name, glm::mat4 value)const{
+    glUniformMatrix4fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &value[0][0] );
+}

src/stb_image.cpp

@@ -0,0 +1,3 @@
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+