lua integration

.gitignore

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

Makefile

@@ -1,2 +1,14 @@
-all:
-	$(MAKE) -C core
+include common.mk
+
+CORE_SRC = $(wildcard core/*.cpp)
+CORE_OBJ = $(CORE_SRC:.cpp=.o)
+
+all: couch
+couch: $(CORE_OBJ) scripting/couch_wrap.o
+	$(CXX) $(LIBS) -o $@ $^
+
+$(CORE_OBJ): %.o: %.cpp
+	$(MAKE) -C core $(notdir $@)
+
+scripting/couch_wrap.o: scripting/couch.i
+	$(MAKE) -C scripting $(notdir $@)

common.mk

@@ -1,3 +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`
+CXX := g++
+CXXFLAGS := `pkg-config --cflags gl glew glfw3 lua` -fPIC -g
+LIBS := `pkg-config --libs gl glew glfw3 lua`

core/Ball.cpp

@@ -1,12 +1,35 @@
 #include "Ball.h"
 
 Ball::Ball() {
+  // It's a cube really
+  // Front
+  vertices.push_back(Vertex(1.0f, 1.0f, 1.0f));
+  vertices.push_back(Vertex(1.0f, -1.0f, 1.0f));
+  vertices.push_back(Vertex(-1.0f, 1.0f, 1.0f));
+  vertices.push_back(Vertex(-1.0f, -1.0f, 1.0f));
+  // Back
   vertices.push_back(Vertex(1.0f, 1.0f, -1.0f));
   vertices.push_back(Vertex(1.0f, -1.0f, -1.0f));
   vertices.push_back(Vertex(-1.0f, 1.0f, -1.0f));
   vertices.push_back(Vertex(-1.0f, -1.0f, -1.0f));
 
+  //Front
   indices.push_back(Index(0, 1, 2));
   indices.push_back(Index(1, 2, 3));
+  //Back
+  indices.push_back(Index(4, 5, 6));
+  indices.push_back(Index(5, 6, 7));
+  // Top
+  indices.push_back(Index(0, 4, 6));
+  indices.push_back(Index(0, 2, 6));
+  // Bottom
+  indices.push_back(Index(1, 3, 7));
+  indices.push_back(Index(1, 5, 7));
+  // Left side
+  indices.push_back(Index(0, 1, 5));
+  indices.push_back(Index(0, 4, 5));
+  // Right side
+  indices.push_back(Index(2, 3, 7));
+  indices.push_back(Index(2, 6, 7));
 }
 

core/Camera.cpp

@@ -0,0 +1,17 @@
+#include "Camera.h"
+
+Camera::Camera() {
+  if (!currentCamera) {
+    currentCamera = this;
+  }
+}
+
+void Camera::MakeCurrent() {
+  currentCamera = this;
+}
+
+Camera*Camera::GetCurrentCamera() {
+  return currentCamera;
+}
+
+Camera *Camera::currentCamera = nullptr;

core/Camera.h

@@ -0,0 +1,16 @@
+#ifndef CAMERA_H
+#define CAMERA_H
+
+#include "Transform.h"
+
+class Camera {
+public:
+  Camera();
+  Transform transform;
+  void MakeCurrent();
+  static Camera *GetCurrentCamera();
+private:
+  static Camera *currentCamera;
+};
+
+#endif /* CAMERA_H */

core/Makefile

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

core/Mesh.h

@@ -1,6 +1,8 @@
 #ifndef MESH_H
 #define MESH_H
 
+#include <list>
+
 #include "types.h"
 #include "Vertex.h"
 #include "Index.h"
@@ -19,4 +21,6 @@ private:
   Id VAO, VBO, EBO;
 };
 
+typedef std::list<Mesh*> MeshList;
+
 #endif /* MESH_H */

core/Transform.cpp

@@ -7,3 +7,7 @@ Transform::Transform() {
 Transform::Transform(Vector3 position) {
   this->position = position;
 }
+
+void Transform::Translate(cfloat x, cfloat y, cfloat z) {
+  position = position + Vector3(x, y, z);
+}

core/Transform.h

@@ -7,6 +7,7 @@ struct Transform {
   Transform();
   Transform(Vector3 position);
   Vector3 position;
+  void Translate(cfloat x, cfloat y, cfloat z);
 };
 
 #endif /* TRANSFORM_H */

core/couch.cpp

@@ -1,21 +1,45 @@
+// C++ includes
 #include <iostream>
 
+#ifdef LUA_SCRIPTING
+// Lua includes
+extern "C" {
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>  
+}
+#endif // LUA_SCRIPTING
+
+// OpenGL Includes
 #include <GL/glew.h>
 #include <GLFW/glfw3.h>
-
 #include <glm/gtc/matrix_transform.hpp>
 
 #include "types.h"
 
 #include "Shader.h"
 #include "Ball.h"
+#include "Camera.h"
 
 Window *window;
 
 const int width = 800;
 const int height = 600;
 
+MeshList meshes;
+
+void AddMeshToList(Mesh &mesh) {
+  meshes.push_front(&mesh);
+}
+#ifdef LUA_SCRIPTING
+
+extern "C" int luaopen_couch(lua_State* L);
+
+#endif // LUA_SCRIPTING
+
+
 int main() {
+
   int err;
   glfwInit();
   glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
@@ -38,29 +62,70 @@ int main() {
 
   glViewport(0, 0, width, height);
 
+#ifdef LUA_SCRIPTING
+  lua_State *L;
+  L = luaL_newstate();
+  luaopen_base(L);
+  luaopen_couch(L);
+  if (luaL_loadfile(L, "main.lua") == 0){
+    lua_call(L, 0, 0);
+    lua_getglobal(L, "init");
+    lua_call(L, 0, 0);
+  } else {
+    std::cerr << "Could not find main.lua" << std::endl;
+    return 1;
+  }
+#endif // LUA_SCRIPTING
+
+  Camera defaultCamera;
+  
   Shader shader("shaders/flat.vert", "shaders/flat.frag");
   shader.Use();
   
-  Ball ball;
-  ball.SetupMesh();
-
   Matrix projection = glm::perspective(glm::radians(45.0f), 800.0f/600.0f, 0.1f, 100.0f);
   shader.UpdateProjection(projection);
-  Matrix view(1.0f);
-  shader.UpdateView(view);
+
+  double lastTime = glfwGetTime();
+  double delta = 0.0;
 
   while(!glfwWindowShouldClose(window)) {
     glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
     glClear(GL_COLOR_BUFFER_BIT);
 
-    Matrix model(1.0f);
-    model = glm::translate(model, ball.transform.position);
-    shader.UpdateModel(model);
-    ball.Draw();
+
+    Matrix view(1.0f);
+    Camera *camera = Camera::GetCurrentCamera();
+    view = glm::translate(view, -camera->transform.position);
+    shader.UpdateView(view);
+
+
+#ifdef LUA_SCRIPTING
+    lua_getglobal(L, "update");
+    lua_pushnumber(L, delta);
+    lua_call(L, 1, 0);
+#endif // LUA_SCRIPTING
+
+    for (Mesh *mesh : meshes) {
+      Matrix model(1.0f);
+      model = glm::translate(model, mesh->transform.position);
+      shader.UpdateModel(model);
+      mesh->Draw();
+    }
+
     
     glfwSwapBuffers(window);
     glfwPollEvents();
+
+    double curTime = glfwGetTime();
+    delta = curTime - lastTime;
+    lastTime = curTime;
   }
+
+#ifdef LUA_SCRIPTING
+
+  lua_close(L);
+
+#endif // LUA_SCRIPTING
   
   glfwDestroyWindow(window);
   glfwTerminate();

main.lua

@@ -0,0 +1,14 @@
+local ball
+local camera
+
+function init()
+   camera = couch.Camera()
+   camera:MakeCurrent()
+   ball = couch.Ball()
+   ball:SetupMesh()
+   couch.AddMeshToList(ball)
+end
+
+function update(delta)
+   camera.transform:Translate(0.0, 0.0, 1.0 * delta);
+end

roadmap.md

@@ -5,7 +5,7 @@
 - GLEW to wrangle extensions
 - GLFW3 for handling windows and whatnot
 - Targets Windows, Linux
-- Guile with GOOPS as scripting language
+- ~~Guile with GOOPS as scripting language~~ Lua is the scripting language with Guile as a strech goal
 - No editor planned
 
 ## Roadmap

scripting/.gitignore

@@ -0,0 +1,2 @@
+couch_wrap.cpp
+couch_wrap.o

scripting/Makefile

@@ -0,0 +1,12 @@
+include ../common.mk
+
+SWIG := swig
+SWIG_OPTS := -lua
+
+all: couch_wrap.o
+
+couch_wrap.o: couch_wrap.cpp
+	$(CXX) $(CXXFLAGS) -I../core -c -o $@ $^
+
+couch_wrap.cpp: couch.i
+	$(SWIG) -c++ $(SWIG_OPTS) -I../core -o $@ $^

scripting/couch.i

@@ -0,0 +1,20 @@
+%module couch
+
+%typemap(in) cfloat {
+  $1 = (cfloat) lua_tonumber(L, $input);
+}
+
+%{
+#include "types.h"
+#include "Transform.h"
+#include "Mesh.h"
+#include "Ball.h"
+#include "Camera.h"
+extern void AddMeshToList(Mesh &mesh);
+%}
+%include "types.h"
+%include "Transform.h"
+%include "Mesh.h"
+%include "Ball.h"
+%include "Camera.h"
+extern void AddMeshToList(Mesh &mesh);