Drew a triangle

.gitignore

@@ -0,0 +1,2 @@
+*.o
+core/couch

Makefile

@@ -0,0 +1,2 @@
+all:
+	$(MAKE) -C core

common.mk

@@ -0,0 +1,3 @@
+CXX = g++
+CXXFLAGS = `pkg-config --cflags gl glew glfw3 guile-2.2` -g
+LIBS = `pkg-config --libs gl glew glfw3 guile-2.2`

core/Ball.cpp

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+#include "Ball.h"
+
+Ball::Ball() {
+  vertices.push_back(Vertex(0.0f, 0.0f, 0.0f));
+  vertices.push_back(Vertex(1.0f, 0.0f, 0.0f));
+  vertices.push_back(Vertex(0.5f, 1.0f, 0.0f));
+
+  indices.push_back(Index(0, 1, 2));
+}
+

core/Ball.h

@@ -0,0 +1,11 @@
+#ifndef BALL_H
+#define BALL_H
+
+#include "Mesh.h"
+
+class Ball : public Mesh {
+public:
+  Ball();
+};
+
+#endif /* BALL_H */

core/Index.cpp

@@ -0,0 +1,7 @@
+#include "Index.h"
+
+Index::Index(unsigned int v0, unsigned int v1, unsigned int v2) {
+  this->v0 = v0;
+  this->v1 = v1;
+  this->v2 = v2;
+}

core/Index.h

@@ -0,0 +1,13 @@
+#ifndef INDEX_H
+#define INDEX_H
+
+#include <vector>
+
+struct Index {
+  unsigned int v0, v1, v2;
+  Index(unsigned int v0, unsigned int v1, unsigned int v2);
+};
+
+typedef std::vector<Index> IndexList;
+
+#endif /* INDEX_H */

core/Makefile

@@ -0,0 +1,8 @@
+include ../common.mk
+
+SOURCES = $(wildcard *.cpp)
+OBJS = $(SOURCES:.cpp=.o)
+
+all: couch
+couch: $(OBJS)
+	$(CXX) $(LIBS) -o $@ $^

core/Mesh.cpp

@@ -0,0 +1,36 @@
+#include "Mesh.h"
+
+Mesh::Mesh() {}
+
+Mesh::Mesh(VertexList vertices, IndexList indices) {
+  this->vertices = vertices;
+  this->indices = indices;
+}
+
+void Mesh::SetupMesh() {
+  glGenVertexArrays(1, &VAO);
+  glGenBuffers(1, &VBO);
+  glGenBuffers(1, &EBO);
+
+  glBindVertexArray(VAO);
+  glBindBuffer(GL_ARRAY_BUFFER, VBO);
+  glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex),
+	       &vertices[0], GL_STATIC_DRAW);
+
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
+  glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(Index),
+	       &indices[0], GL_STATIC_DRAW);
+
+  // Vertex positions
+  glEnableVertexAttribArray(0);
+  glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*) 0);
+  // TODO normals, uv
+
+  glBindVertexArray(0);
+}
+
+void Mesh::Draw() {
+  glBindVertexArray(VAO);
+  glDrawElements(GL_TRIANGLES, indices.size() * 3, GL_UNSIGNED_INT, 0);
+  glBindVertexArray(0);
+}

core/Mesh.h

@@ -0,0 +1,22 @@
+#ifndef MESH_H
+#define MESH_H
+
+#include "types.h"
+#include "Vertex.h"
+#include "Index.h"
+#include "Transform.h"
+
+class Mesh {
+public:
+  VertexList vertices;
+  IndexList indices;
+  Transform transform;
+  Mesh();
+  Mesh(VertexList vertices, IndexList indices);
+  void Draw();
+  virtual void SetupMesh();
+private:
+  Id VAO, VBO, EBO;
+};
+
+#endif /* MESH_H */

core/Shader.cpp

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+#include "Shader.h"
+
+Shader::Shader(const char* vertexPath, const char* fragmentPath) {
+  std::string vertexCode;
+  std::string fragmentCode;
+
+  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(vertexPath);
+    fShaderFile.open(fragmentPath);
+    std::stringstream vShaderStream, fShaderStream;
+
+    vShaderStream << vShaderFile.rdbuf();
+    fShaderStream << fShaderFile.rdbuf();
+
+    vShaderFile.close();
+    fShaderFile.close();
+
+    vertexCode = vShaderStream.str();
+    fragmentCode = fShaderStream.str();
+  } catch (std::ifstream::failure e) {
+    std::cerr << "Error reading shader file." << std::endl;
+  }
+
+  const char * vShaderCode = vertexCode.c_str();
+  const char * fShaderCode = fragmentCode.c_str();
+  
+
+  Id vertex, fragment;
+  int success;
+  char infoLog[512];
+
+  vertex = glCreateShader(GL_VERTEX_SHADER);
+  glShaderSource(vertex, 1, &vShaderCode, NULL);
+  glCompileShader(vertex);
+  glGetShaderiv(vertex, GL_COMPILE_STATUS, &success);
+  if (!success) {
+    glGetShaderInfoLog(vertex, 512, NULL, infoLog);
+    std::cerr << "Vertex shader failed compilation\n" << infoLog << std::endl;
+  }
+  
+  fragment = glCreateShader(GL_FRAGMENT_SHADER);
+  glShaderSource(fragment, 1, &fShaderCode, NULL);
+  glCompileShader(fragment);
+  glGetShaderiv(fragment, GL_COMPILE_STATUS, &success);
+  if (!success) {
+    glGetShaderInfoLog(fragment, 512, NULL, infoLog);
+    std::cerr << "Fragment shader failed compilation\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, NULL, infoLog);
+        std::cerr << "Shader program linking failed\n" << infoLog << std::endl;
+  }
+
+  glDeleteShader(vertex);
+  glDeleteShader(fragment);
+      
+}
+
+void Shader::Use() {
+  glUseProgram(id);
+}

core/Shader.h

@@ -0,0 +1,19 @@
+#ifndef SHADER_H
+#define SHADER_H
+
+#include <string>
+#include <fstream>
+#include <sstream>
+#include <iostream>
+
+#include "types.h"
+
+class Shader {
+public:
+  Id id;
+
+  Shader(const char *vertexPath, const char *fragmentPath);
+  void Use();
+};
+
+#endif /* SHADER_H */

core/Transform.cpp

@@ -0,0 +1,9 @@
+#include "Transform.h"
+
+Transform::Transform() {
+  position = Vector3(0.0f);
+}
+
+Transform::Transform(Vector3 position) {
+  this->position = position;
+}

core/Transform.h

@@ -4,7 +4,9 @@
 #include "types.h"
 
 struct Transform {
-  Position position;
+  Transform();
-}
+  Transform(Vector3 position);
+  Vector3 position;
+};
 
 #endif /* TRANSFORM_H */

core/Vertex.cpp

@@ -0,0 +1,13 @@
+#include "Vertex.h"
+
+Vertex::Vertex() {
+  x = 0.0f;
+  y = 0.0f;
+  z = 0.0f;
+}
+
+Vertex::Vertex(cfloat x, cfloat y, cfloat z) {
+  this->x = x;
+  this->y = y;
+  this->z = z;
+}

core/Vertex.h

@@ -1,10 +1,16 @@
 #ifndef VERTEX_H
 #define VERTEX_H
 
+#include <vector>
+
 #include "types.h"
 
 struct Vertex {
+  Vertex();
+  Vertex(cfloat x, cfloat y, cfloat z);
   cfloat x, y, z;
-}
+};
+
+typedef std::vector<Vertex> VertexList;
 
 #endif /* VERTEX_H */

core/couch.cpp

@@ -0,0 +1,58 @@
+#include <iostream>
+
+#include <GL/glew.h>
+#include <GLFW/glfw3.h>
+
+#include "types.h"
+
+#include "Shader.h"
+#include "Ball.h"
+
+Window *window;
+
+const int width = 800;
+const int height = 600;
+
+int main() {
+  int err;
+  glfwInit();
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+  glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+  glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+
+  window = glfwCreateWindow(width, height, "Couch", NULL, NULL);
+
+  if (!window) {
+    std::cerr << "Error creating window" << std::endl;
+    return 1;
+  }
+
+  glfwMakeContextCurrent(window);
+
+  err = glewInit();
+  if (err != GLEW_OK) {
+    std::cerr << "Error initializing glew" << std::endl;
+  }
+
+  glViewport(0, 0, width, height);
+
+  Shader shader("shaders/flat.vert", "shaders/flat.frag");
+  shader.Use();
+  
+  Ball ball;
+  ball.SetupMesh();
+
+  while(!glfwWindowShouldClose(window)) {
+    glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
+    glClear(GL_COLOR_BUFFER_BIT);
+    
+    ball.Draw();
+    
+    glfwSwapBuffers(window);
+    glfwPollEvents();
+  }
+  
+  glfwDestroyWindow(window);
+  glfwTerminate();
+  return 0;
+}

core/types.h

@@ -1,10 +1,15 @@
 #ifndef TYPES_H
 #define TYPES_H
 
+#include <vector>
+
 #include <GL/glew.h>
+#include <GLFW/glfw3.h>
 #include <glm/glm.hpp>
 
-typedef glm::vec3 Position;
+typedef GLFWwindow Window;
+typedef glm::vec3 Vector3;
 typedef GLfloat cfloat;
+typedef GLuint Id;
 
 #endif /* TYPES_H */

shaders/flat.frag

@@ -0,0 +1,10 @@
+#version 330 core
+
+// uniform vec3 color;
+
+out vec4 FragColor;
+
+void main() {
+  //FragColor = vec4(color, 1.0);
+  FragColor = vec4(1.0, 0.0, 0.0, 1.0);
+}

shaders/flat.vert

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+#version 330 core
+
+layout (location = 0) in vec3 pos;
+
+// uniform mat4 MODEL;
+// uniform mat4 VIEW;
+// uniform mat4 PROJECTION;
+
+void main() {
+  //gl_Position = MODEL * VIEW * PROJECTION * vec4(pos, 1.0);
+  gl_Position = vec4(pos, 1.0);
+}