render the front face of a cube

inc/scene.hpp

@@ -10,9 +10,9 @@
 class Scene {
 public:
   usu::vector<std::shared_ptr<Renderable>> renderables;
-  std::tuple<std::uint16_t, std::uint16_t>
+  std::tuple<std::uint32_t, std::uint32_t>
       viewport_dimension; // <width, height>
-  std::tuple<std::uint16_t, std::uint16_t> scene_dimension;
+  std::tuple<std::uint32_t, std::uint32_t> scene_dimension;
   VECTOR directional_light;
   FIXED z_plane;
 

src/main.cpp

@@ -5,13 +5,6 @@
 #include "vector.hpp"
 #include <tonc.h>
 
-class Box : public Renderable {
-public:
-  virtual void render(std::shared_ptr<Scene> scene) {
-    scene->draw_line({0, 0}, {2 << FIX_SHIFT, 3 << FIX_SHIFT}, 1);
-  }
-};
-
 int main() {
   // interrupt & mode 4 foo
   irq_init(NULL);
@@ -20,14 +13,19 @@ int main() {
   palette::put_palette((std::uint16_t *)MEM_PAL);
 
   auto scene = std::make_shared<Scene>();
-  //  auto cube = std::shared_ptr<Renderable>((Renderable *)new Cube());
-  //  scene->renderables.add(cube);
-  auto box = std::shared_ptr<Renderable>((Renderable *)new Box());
 
-  scene->renderables.add(box);
+  auto cube = std::shared_ptr<Mesh>((Mesh *)new Cube);
+
+  ModelInstance modelInstance(cube, int2fx(2), {0x0C7F, 0x0000, 0},
+                              {int2fx(0), 0, int2fx(0)});
+
+  auto modelInstancePtr = std::shared_ptr<Renderable>(&modelInstance);
+  scene->renderables.add(modelInstancePtr);
 
   while (1) {
+
     Scene::render(scene);
+    vid_flip();
 
     VBlankIntrWait();
   }

src/model_instance.cpp

@@ -9,11 +9,12 @@ ModelInstance::ModelInstance(std::shared_ptr<Mesh> mesh, FIXED scale,
 VECTOR rotate(VECTOR v, VECTOR rot) {
   FIXED sin_theta_x, sin_theta_y, sin_theta_z;
   FIXED cos_theta_x, cos_theta_y, cos_theta_z;
+
   VECTOR res = {v.x, v.y, v.z};
 
   if (rot.x != 0) {
-    sin_theta_x = lu_sin(rot.x) >> 4;
-    cos_theta_x = lu_cos(rot.x) >> 4;
+    sin_theta_x = float2fx(0.707); // lu_sin(rot.x) >> 4;
+    cos_theta_x = float2fx(0.707); // lu_cos(rot.x) >> 4;
     res.y = fxmul(res.y, cos_theta_x) - fxmul(res.z, sin_theta_x);
     res.z = fxmul(res.z, cos_theta_x) + fxmul(res.y, sin_theta_x);
   }
@@ -36,14 +37,14 @@ VECTOR rotate(VECTOR v, VECTOR rot) {
 }
 
 void ModelInstance::render(std::shared_ptr<Scene> scene_context) {
-  usu::vector<VECTOR> transformed(m_mesh->vertices.size());
-  usu::vector<POINT> projected(transformed.size());
+  usu::vector<POINT> projected(m_mesh->vertices.size());
 
-  for (std::uint32_t i = 0; i < transformed.size(); i++) {
-    VECTOR rotated = rotate(m_mesh->vertices[i], m_rot);
-    vec_add(&transformed[i], &rotated, &m_pos);
+  for (std::uint32_t i = 0; i < projected.size(); i++) {
+    VECTOR transformed =
+        m_mesh->vertices[i]; // rotate(m_mesh->vertices[i], m_rot);
+    //    vec_add(&transformed, &transformed, &m_pos);
 
-    projected[i] = scene_context->project_2d(m_mesh->vertices[i]);
+    projected[i] = scene_context->project_2d(transformed);
   }
 
   for (const TRIANGLE triangle : m_mesh->triangles) {

src/scene.cpp

@@ -2,7 +2,7 @@
 
 Scene::Scene() {
   directional_light = {0, 0, -1};
-  viewport_dimension = {2, 3};
+  viewport_dimension = {3, 2};
   scene_dimension = {SCREEN_WIDTH / 2, SCREEN_HEIGHT};
 
   z_plane = int2fx(1);
@@ -21,13 +21,11 @@ POINT Scene::project_2d(VECTOR vertex) {
 }
 
 POINT Scene::viewport_to_scene(POINT p) {
-  FIXED x = fxmul(
-      p.x, (std::get<0>(scene_dimension) / std::get<0>(viewport_dimension))
-               << FIX_SHIFT);
-  FIXED y = fxmul(
-      p.y, (std::get<1>(scene_dimension) / std::get<1>(viewport_dimension))
-               << FIX_SHIFT);
-  return {x, y};
+  FIXED x = fxmul(p.x, int2fx(std::get<0>(scene_dimension) /
+                              std::get<0>(viewport_dimension)));
+  FIXED y = fxmul(p.y, int2fx(std::get<1>(scene_dimension) /
+                              std::get<1>(viewport_dimension)));
+  return {x >> FIX_SHIFT, y >> FIX_SHIFT};
 }
 
 void Scene::draw_line(POINT p0, POINT p1, std::uint8_t pal_idx) {
@@ -36,5 +34,5 @@ void Scene::draw_line(POINT p0, POINT p1, std::uint8_t pal_idx) {
 
   std::uint16_t pixels = (pal_idx << 8) | pal_idx;
   bmp16_line(scene_p0.x, scene_p0.y, scene_p1.x, scene_p1.y, pixels, vid_page,
-             M4_WIDTH);
+             SCREEN_WIDTH);
 }