From 92c27a1ef89996917818d5daaa9beff0b3c4e66b Mon Sep 17 00:00:00 2001
From: Andreas Ortmann <ortmann@finf.uni-hannover.de>
Date: Wed, 28 Sep 2016 13:16:11 +0200
Subject: [PATCH] added model loading into opengl. not yet seeing output.

---
 game/game_window.hpp                          |  4 +-
 game/renderer_polygon_3d/polygon_model.hpp    | 77 ++++++++++++++++++-
 .../renderer_polygon_3d.cpp                   | 11 ++-
 .../renderer_polygon_3d.hpp                   |  2 +
 4 files changed, 87 insertions(+), 7 deletions(-)

diff --git a/game/game_window.hpp b/game/game_window.hpp
index f48147a..6952095 100644
--- a/game/game_window.hpp
+++ b/game/game_window.hpp
@@ -20,8 +20,8 @@
 class GameWindow : public endofthejedi::GLWindow {
   private:
     Game* m_game;
-    endofthejedi::RendererPolygon2d m_renderer;
-    //endofthejedi::RendererPolygon3d m_renderer;
+    //endofthejedi::RendererPolygon2d m_renderer;
+    endofthejedi::RendererPolygon3d m_renderer;
     //endofthejedi::RendererRayTracer m_renderer;
 
   protected:
diff --git a/game/renderer_polygon_3d/polygon_model.hpp b/game/renderer_polygon_3d/polygon_model.hpp
index 2b1d155..9a58acd 100644
--- a/game/renderer_polygon_3d/polygon_model.hpp
+++ b/game/renderer_polygon_3d/polygon_model.hpp
@@ -24,6 +24,10 @@ class PolygonModel {
 
         bool import()
         {
+            m_vbo_id_position = 0;
+            m_vbo_id_normal   = 0;
+            m_numVertices     = 0;
+
             // Create an instance of the Importer class
             Assimp::Importer importer;
             // And have it read the given file with some example postprocessing
@@ -51,6 +55,75 @@ class PolygonModel {
             return true;
         }
 
+        bool loadIntoOpenGl()
+        {
+            glEnableVertexAttribArray(0);
+
+            glGenBuffers(1, &m_vbo_id_position);            // Generate buffer
+            glBindBuffer(GL_ARRAY_BUFFER, m_vbo_id_position); // Bind buffer
+
+            glVertexAttribPointer(0,
+                    3, // three floats per vertex
+                    GL_FLOAT,  // Data is floating point type
+                    GL_FALSE,  // No fixed point scaling
+                    0,         // stride: no
+                    NULL);     // No offset
+
+            // fill buffer with the loaded mesh position data
+            glBufferData(
+                    GL_ARRAY_BUFFER,                    // Buffer target
+                    3 * m_numVertices * sizeof(float),  // Buffer data size
+                    m_data_position.data(),             // Buffer data pointer
+                    GL_STATIC_DRAW);                    // Usage - Data never changes;
+
+            // TODO
+#if 0
+        // 2 holds normal data
+        glEnableVertexAttribArray(2);
+        glGenBuffers(1, &(model->vbo_normal));            // Generate buffer
+        glBindBuffer(GL_ARRAY_BUFFER, model->vbo_normal); // Bind buffer
+
+        glVertexAttribPointer(2,
+            3,         // three floats per normal
+            GL_FLOAT,  // Data is floating point type
+            GL_FALSE,  // No fixed point scaling
+            0,         // stride: no
+            NULL);     // No offset
+
+        // Fill bound buffer
+        glBufferData(
+            GL_ARRAY_BUFFER,                    // Buffer target
+            3*model->numVertices*sizeof(float), // Buffer data size
+            model->normals,                     // Buffer data pointer
+            GL_STATIC_DRAW);                    // Usage - Data never changes;
+#endif
+            return true;
+        }
+
+        bool bind()
+        {
+            // bind position vbo
+            glEnableVertexAttribArray(0);
+            glBindBuffer(GL_ARRAY_BUFFER, m_vbo_id_position);
+            glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);
+
+            // TODO
+#if 0
+            // bind normal vbo
+            GLuint normalLoc = glGetAttribLocation(program, "attr_normal");
+            glEnableVertexAttribArray(normalLoc);
+            glBindBuffer(GL_ARRAY_BUFFER, mesh->vbo_normal);
+            glVertexAttribPointer(normalLoc, 3, GL_FLOAT, GL_FALSE, 0, NULL);
+#endif
+
+            return true;
+        }
+
+        void render()
+        {
+            glDrawArrays(GL_TRIANGLES, 0, m_numVertices);
+        }
+
     private:
         bool copyVertices(const aiScene *scene)
         {
@@ -104,12 +177,12 @@ class PolygonModel {
         std::string m_filename;
         bool        m_loaded;
 
-        size_t      m_numVertices;
-
         // both will hold 3 * numVertices floats
         std::vector<float> m_data_position;
         std::vector<float> m_data_normal;
 
+        size_t      m_numVertices;
+
         GLuint      m_vbo_id_position;
         GLuint      m_vbo_id_normal;
 };
diff --git a/game/renderer_polygon_3d/renderer_polygon_3d.cpp b/game/renderer_polygon_3d/renderer_polygon_3d.cpp
index c2791d7..ef05f3e 100644
--- a/game/renderer_polygon_3d/renderer_polygon_3d.cpp
+++ b/game/renderer_polygon_3d/renderer_polygon_3d.cpp
@@ -9,14 +9,19 @@ namespace endofthejedi {
     {
         std::cout<<"setup 3d" << std::endl;
 
-        PolygonModel atomicBomb("../data/mesh/small_atomic_bomb.stl");
-        exit(-1);
+        m_atomicBomb = new PolygonModel("../data/mesh/small_atomic_bomb.stl");
+        m_atomicBomb->loadIntoOpenGl();
+
+        m_models.push_back(m_atomicBomb);
     }
 
     void RendererPolygon3d::render(const game::State *state)
     {
         (void) state;
 
-        std::cout<<"render 3d" << std::endl;
+        m_atomicBomb->bind();
+        m_atomicBomb->render();
+
+        //std::cout<<"render 3d" << std::endl;
     }
 }
diff --git a/game/renderer_polygon_3d/renderer_polygon_3d.hpp b/game/renderer_polygon_3d/renderer_polygon_3d.hpp
index c0685f1..4d0afee 100644
--- a/game/renderer_polygon_3d/renderer_polygon_3d.hpp
+++ b/game/renderer_polygon_3d/renderer_polygon_3d.hpp
@@ -25,5 +25,7 @@ namespace endofthejedi {
 
         private:
             std::vector<PolygonModel*> m_models;
+
+            PolygonModel *m_atomicBomb;
     };
 }