Merge pull request #1 from Simponic/cube

Cube

inc/mesh.hpp

@@ -14,9 +14,9 @@ typedef struct TRIANGLE {
 } TRIANGLE;
 
 class Mesh {
-protected:
-  usu::vector<VECTOR> m_vertices;
-  usu::vector<TRIANGLE> m_triangles;
+public:
+  usu::vector<VECTOR> vertices;
+  usu::vector<TRIANGLE> triangles;
 };
 
 #endif // MESH_HPP

inc/model_instance.hpp

@@ -5,13 +5,19 @@
 #include "renderable.hpp"
 #include <tonc.h>
 
-class ModelInstance : Renderable {
+class ModelInstance : public Renderable {
 private:
+  std::shared_ptr<Mesh> m_mesh;
   FIXED m_scale;
-  VECTOR m_rotation;
+  VECTOR m_rot; // though technically "FIXED"'s, these are simply s32's
+                // where [0, 2pi] -> [0, 0xFFFF] in the x,y,z axes
   VECTOR m_pos;
 
-  std::shared_ptr<Mesh> m_mesh;
+public:
+  ModelInstance(std::shared_ptr<Mesh> mesh, FIXED scale, VECTOR m_rotation,
+                VECTOR m_pos);
+  void add_pos(VECTOR d_pos);
+  virtual void render(std::shared_ptr<Scene> scene_context);
 };
 
 #endif // MODEL_INSTANCE_HPP

inc/palette.hpp

@@ -10,11 +10,12 @@ constexpr std::uint8_t pal_len = 255;
 constexpr std::uint16_t cube_colors[6] = {CLR_WHITE,  CLR_YELLOW, CLR_RED,
                                           CLR_ORANGE, CLR_BLUE,   CLR_GREEN};
 
-constexpr void put_palette(std::uint16_t *palette_address) {
+void put_palette(std::uint16_t *palette_address) {
   toncset16(palette_address, CLR_BLACK, 1);
-  toncset16(palette_address + 1, CLR_WHITE, 1);
+  for (std::uint32_t i = 0; i < 6; ++i)
+    toncset16(palette_address + i + 1, cube_colors[i], 1);
+  // TODO: PALETTE GRADIENT IN ALPHA DIMENSION (BRIGHTNESS)
 }
-
 }; // namespace palette
 
 #endif // PALETTE_HPP

inc/renderable.hpp

@@ -7,7 +7,7 @@ class Scene;
 
 class Renderable {
 public:
-  virtual void render(std::shared_ptr<Scene> scene_context);
+  virtual void render(std::shared_ptr<Scene> scene_context) = 0;
 };
 
 #endif

inc/scene.hpp

@@ -1,20 +1,29 @@
-#ifndef CANVAS_HPP
-#define CANVAS_HPP
+#ifndef SCENE_HPP
+#define SCENE_HPP
 
-#include "mesh.hpp"
+#include "model_instance.hpp"
+#include "renderable.hpp"
 #include "vector.hpp"
 #include <cstdint>
+#include <tonc.h>
 
 class Scene {
-private:
-  usu::vector<Mesh> meshes;
-  std::uint32_t width;
-  std::uint32_t height;
-
 public:
-  Scene();
+  usu::vector<std::shared_ptr<Renderable>> renderables;
+  std::tuple<std::uint32_t, std::uint32_t>
+      viewport_dimension; // <width, height>
+  std::tuple<std::uint32_t, std::uint32_t> scene_dimension;
+  VECTOR directional_light;
+  FIXED z_plane;
 
-  void render();
+  Scene();
+  POINT project_2d(VECTOR vertex);
+  POINT viewport_to_scene(POINT p);
+  void draw_line(POINT p0, POINT p1, std::uint8_t pal_idx);
+  static inline void render(std::shared_ptr<Scene> scene_ctx) {
+    for (std::shared_ptr<Renderable> renderable : scene_ctx->renderables)
+      renderable->render(scene_ctx);
+  }
 };
 
 #endif // SCENE_HPP

src/cube.cpp

@@ -1,6 +1,23 @@
 #include "cube.hpp"
 
 Cube::Cube() {
-  for (std::uint8_t i = 0; i < 8; ++i)
-    m_vertices.add({(i >> 2) & 1, (i >> 1) & 1, i & 1});
+  for (std::uint8_t i = 0; i < 8; ++i) {
+    VECTOR vertex = {int2fx((((i >> 2) & 1) << 1) - 1),
+                     int2fx((((i >> 1) & 1) << 1) - 1),
+                     int2fx(((i & 1) << 1) - 1)};
+    vertices.add(vertex);
+  }
+
+  triangles.add({{0, 4, 5}, 1});
+  triangles.add({{0, 1, 5}, 1});
+  triangles.add({{4, 6, 7}, 1});
+  triangles.add({{4, 5, 7}, 1});
+  triangles.add({{1, 5, 7}, 1});
+  triangles.add({{1, 3, 7}, 1});
+  triangles.add({{0, 4, 6}, 1});
+  triangles.add({{0, 2, 6}, 1});
+  triangles.add({{0, 2, 1}, 1});
+  triangles.add({{1, 2, 3}, 1});
+  triangles.add({{2, 7, 3}, 1});
+  triangles.add({{2, 5, 7}, 1});
 }

src/main.cpp

@@ -1,4 +1,7 @@
+#include "cube.hpp"
 #include "palette.hpp"
+#include "renderable.hpp"
+#include "scene.hpp"
 #include "vector.hpp"
 #include <tonc.h>
 
@@ -7,23 +10,27 @@ int main() {
   irq_init(NULL);
   irq_enable(II_VBLANK);
   REG_DISPCNT = DCNT_MODE4 | DCNT_BG2;
-
-  // initialize our palette
   palette::put_palette((std::uint16_t *)MEM_PAL);
 
-  // begin
-  bmp16_line(1, 3, 1 + SCREEN_WIDTH / 2 - 2, SCREEN_HEIGHT, 0x0101, vid_page,
-             SCREEN_WIDTH);
-  vid_flip();
-  bmp16_line(2, 3, 2 + SCREEN_WIDTH / 2 - 2, SCREEN_HEIGHT, 0x0101, vid_page,
-             SCREEN_WIDTH);
+  auto scene = std::make_shared<Scene>();
 
-  std::uint32_t frame = 0;
+  auto cube = std::shared_ptr<Mesh>((Mesh *)new Cube);
+
+  ModelInstance model_instance(cube, float2fx(0.25), {0, 0x0C00, 0},
+                               {int2fx(3), int2fx(3), int2fx(3)});
+
+  auto model_instance_ptr = std::shared_ptr<Renderable>(&model_instance);
+  scene->renderables.add(model_instance_ptr);
+
+  std::uint8_t frame = 0;
   while (1) {
-    frame = (frame + 1) % 60;
     if (frame == 0) {
+      model_instance.add_pos({0, 0, float2fx(0.2)});
+      M4_CLEAR();
+      Scene::render(scene);
       vid_flip();
     }
+    frame = (frame + 1) % 10;
 
     VBlankIntrWait();
   }

src/mesh.hpp

@@ -1,11 +0,0 @@
-#include "mesh.hpp"
-#include "scene.hpp"
-#include <tuple>
-
-void Mesh::render(std::shared_ptr<Scene> scene_context) {
-  for (const TRIANGLE triangle : m_triangles) {
-    VECTOR v0 = m_vertices[std::get<0>(triangle.vertex_indices)];
-    VECTOR v1 = m_vertices[std::get<1>(triangle.vertex_indices)];
-    VECTOR v2 = m_vertices[std::get<2>(triangle.vertex_indices)];
-  }
-}

src/model_instance.cpp

@@ -0,0 +1,60 @@
+#include "model_instance.hpp"
+#include "scene.hpp"
+#include <tuple>
+
+ModelInstance::ModelInstance(std::shared_ptr<Mesh> mesh, FIXED scale,
+                             VECTOR rotation, VECTOR position)
+    : m_mesh(mesh), m_scale(scale), m_rot(rotation), m_pos(position) {}
+
+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 = 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);
+  }
+
+  if (rot.y != 0) {
+    sin_theta_y = lu_sin(rot.y) >> 4;
+    cos_theta_y = lu_cos(rot.y) >> 4;
+    res.x = fxmul(res.x, cos_theta_y) + fxmul(res.z, sin_theta_y);
+    res.z = fxmul(res.z, cos_theta_y) - fxmul(res.x, sin_theta_y);
+  }
+
+  if (rot.z != 0) {
+    sin_theta_z = lu_sin(rot.z) >> 4;
+    cos_theta_z = lu_cos(rot.z) >> 4;
+    res.x = fxmul(res.x, cos_theta_z) - fxmul(res.y, sin_theta_z);
+    res.y = fxmul(res.z, cos_theta_z) + fxmul(res.x, sin_theta_z);
+  }
+
+  return res;
+}
+
+void ModelInstance::render(std::shared_ptr<Scene> scene_context) {
+  usu::vector<POINT> projected(m_mesh->vertices.size());
+
+  for (std::uint32_t i = 0; i < projected.size(); i++) {
+    VECTOR transformed = rotate(m_mesh->vertices[i], m_rot);
+    vec_add(&transformed, &transformed, &m_pos);
+
+    projected[i] = scene_context->project_2d(transformed);
+  }
+
+  for (const TRIANGLE triangle : m_mesh->triangles) {
+    POINT v0 = projected[std::get<0>(triangle.vertex_indices)];
+    POINT v1 = projected[std::get<1>(triangle.vertex_indices)];
+    POINT v2 = projected[std::get<2>(triangle.vertex_indices)];
+
+    scene_context->draw_line(v0, v1, triangle.color_idx);
+    scene_context->draw_line(v1, v2, triangle.color_idx);
+    scene_context->draw_line(v2, v0, triangle.color_idx);
+  }
+}
+
+void ModelInstance::add_pos(VECTOR d_pos) { vec_add(&m_pos, &m_pos, &d_pos); }

src/scene.cpp

@@ -0,0 +1,38 @@
+#include "scene.hpp"
+
+Scene::Scene() {
+  directional_light = {0, 0, -1};
+  viewport_dimension = {3, 2};
+  scene_dimension = {SCREEN_WIDTH / 2, SCREEN_HEIGHT};
+
+  z_plane = int2fx(1);
+}
+
+POINT Scene::project_2d(VECTOR vertex) {
+  POINT pt = {0, 0};
+
+  if (vertex.z != 0) {
+    pt.x = fxdiv(z_plane, vertex.z);
+    pt.y = fxmul(vertex.y, pt.x);
+    pt.x = fxmul(vertex.x, pt.x);
+  }
+
+  return pt;
+}
+
+POINT Scene::viewport_to_scene(POINT p) {
+  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) {
+  POINT scene_p0 = viewport_to_scene(p0);
+  POINT scene_p1 = viewport_to_scene(p1);
+
+  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,
+             SCREEN_WIDTH);
+}