More cubes

headers/shader.hpp

@@ -1,6 +1,7 @@
 #ifndef SHADER_H
 #define SHADER_H
 #include <glad/glad.h>
+#include <glm/glm.hpp>
 #include <string>
 
 class Shader {
@@ -10,6 +11,7 @@ public:
   void use();
   void setInt(const std::string &name, int value);
   void setFloat(const std::string &name, float value);
+  void setMat4(const std::string &name, glm::mat4 value);
 
 private:
   unsigned int ID;

headers/shapes.h

@@ -26,6 +26,51 @@ float sqr_tex_vertices[] = {
     -0.5f, 0.5f,  0.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f  /*top left*/
 };
 
+float cube_vertices[] = {
+  /*positions*texture cords*/
+    -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,  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
+};
+
 const char *basicVertexShaderSource =
     "#version 330 core\n"
     "layout (location = 0) in vec3 aPos;\n"

shaders/MVPTexVert.glsl

@@ -0,0 +1,18 @@
+#version 330 core
+layout (location = 0) in vec3 aPos;
+layout (location = 1) in vec3 aColor;
+layout (location = 2) in vec2 aTexCoord;
+
+out vec3 ourColor;
+out vec2 TexCoord;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+
+void main()
+{
+    gl_Position = projection * view * model * vec4(aPos, 1.0);
+    ourColor = aColor;
+    TexCoord = aTexCoord;
+}

shaders/TexFrag.glsl

@@ -8,5 +8,5 @@ uniform sampler2D tex0;
 
 void main()
 {
-    FragColor = texture(Tex0, TexCoord) * vec4(ourColor, 1.0);
+    FragColor = texture(tex0, TexCoord) * vec4(ourColor, 1.0);
 }

src/main.cpp

@@ -1,5 +1,8 @@
 #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 <cassert>
 #include <iostream>
 #include <shader.hpp>
@@ -11,6 +14,19 @@
 void processInput(GLFWwindow *window);
 void framebuffer_size_callback(GLFWwindow *window, int width, int height);
 
+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)
+};
+
 int main(void) {
   int tmp = 0;
 
@@ -36,25 +52,26 @@ int main(void) {
   glGenBuffers(1, &VBO);
   glBindBuffer(GL_ARRAY_BUFFER, VBO);
 
-  glBufferData(GL_ARRAY_BUFFER, sizeof(sqr_tex_vertices), sqr_tex_vertices,
+  glBufferData(GL_ARRAY_BUFFER, sizeof(cube_vertices),cube_vertices,
                GL_STATIC_DRAW);
-  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void *)0);
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void *)0);
   glEnableVertexAttribArray(0);
-  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 8 * sizeof(float),
-                        (void *)(3 * sizeof(float)));
+
+  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float),
+                        (void *)0);
   glEnableVertexAttribArray(1);
 
-  glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 8 * sizeof(float),
-                        (void *)(6 * sizeof(float)));
+  glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float),
+                        (void *)(3 * sizeof(float)));
   glEnableVertexAttribArray(2);
 
-  glGenBuffers(1, &EBO);
-  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
-  glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(sqr_indices), sqr_indices,
-               GL_STATIC_DRAW);
+  // glGenBuffers(1, &EBO);
+  // glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+  // glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(sqr_indices), sqr_indices,
+  //              GL_STATIC_DRAW);
 
   Shader *shaderProgram =
-      new Shader("./shaders/TexVert.glsl", "./shaders/TexFrag.glsl");
+      new Shader("./shaders/MVPTexVert.glsl", "./shaders/TexFrag.glsl");
 
   unsigned int texture;
   glGenTextures(1, &texture);
@@ -80,18 +97,40 @@ int main(void) {
   stbi_image_free(data);
 
   while (!glfwWindowShouldClose(window)) {
+    glm::mat4 view = glm::mat4(1.0f); /*move camera*/
+    view = glm::translate(view, glm::vec3(0.0f, 0.0f, -3.0f));
+    glm::mat4 projection = glm::perspective(glm::radians(45.0f), 800.0f / 600.0f, 0.1f, 100.0f); /*camera settings*/
+
     processInput(window);
 
     glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
-    glClear(GL_COLOR_BUFFER_BIT);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
     shaderProgram->use();
     shaderProgram->setInt("Tex0",0);
+    shaderProgram->setMat4("view",view);
+    shaderProgram->setMat4("projection",projection);
+
     glActiveTexture(GL_TEXTURE0);
     glBindTexture(GL_TEXTURE_2D, texture);
     glBindVertexArray(VAO);
+    glEnable(GL_DEPTH_TEST);
 
-    glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
+    for(unsigned int i = 0; i < 10; i++)
+      {
+        glm::mat4 model = glm::mat4(1.0f);
+        model = glm::translate(model, cubePositions[i]);
+        float angle = 20.0f * i;
+        model = glm::rotate(model, glm::radians(angle),
+                            glm::vec3(1.0f, 0.3f, 0.5f));
+        model = glm::rotate(model, (float)glfwGetTime() * glm::radians(55.0f),
+                            glm::vec3(1.0f, 0.5f, 0.0f));
+        shaderProgram->setMat4("model", model);
+        glDrawArrays(GL_TRIANGLES, 0, 36);
+      }
+
+    glDrawArrays(GL_TRIANGLES, 0, 36);
+    //glDrawElements(GL_TRIANGLES, 6, GL_UNSIGNED_INT, 0);
     glfwSwapBuffers(window);
 
     glfwPollEvents();

src/shader.cpp

@@ -1,5 +1,6 @@
 #include <fstream>
 #include <glad/glad.h>
+#include <glm/gtc/type_ptr.hpp>
 #include <iostream>
 #include <shader.hpp>
 #include <sstream>
@@ -44,6 +45,11 @@ void Shader::setFloat(const std::string &name, float value) {
   glUniform1f(glGetUniformLocation(ID, name.c_str()), value);
 }
 
+void Shader::setMat4(const std::string &name, glm::mat4 value) {
+  glUniformMatrix4fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, glm::value_ptr(value));
+
+}
+
 /*priv*/
 unsigned int Shader::shaderCMPL(GLenum type, const char *src) {
   unsigned int shader;