From e730e8bdc69ef89dfa28d2606d260cb8b72f4740 Mon Sep 17 00:00:00 2001
From: vimene <vincent.menegaux@gmail.com>
Date: Sun, 26 Nov 2023 17:58:30 +0100
Subject: added scenes, camera and meshes

---
 src/engine.cpp | 48 +++++++++++++++++++++++++++++++-----------------
 1 file changed, 31 insertions(+), 17 deletions(-)

(limited to 'src/engine.cpp')

diff --git a/src/engine.cpp b/src/engine.cpp
index 112d230..145c1f9 100644
--- a/src/engine.cpp
+++ b/src/engine.cpp
@@ -18,10 +18,13 @@
 
 #include "fb/chfb.h"
 #include "fb/pixfb.h"
+#include "o3d/scene.h"
+#include "o3d/mesh.h"
 #include "o3d/obj3d.h"
 #include "o3d/vertex.h"
 #include "o3d/vertex_data.h"
 #include "o3d/tri_vertex.h"
+#include "o3d/camera.h"
 #include "math/math_vector.h"
 #include "math/mat4.h"
 
@@ -49,22 +52,36 @@ static void usage_error_exit() {
 
 template <class FB>
 static void scene_main(FB& fb, std::function<bool()> update_frame) {
-    engine::math::MathVector3 a{0.f, 0.f, 0.f};
     float dist = 4.f;
     float rad = 5.f;
     bool cont = true;
-    std::array<engine::o3d::Object3D, 2> objs{{ engine::o3d::Object3D::cube(), engine::o3d::Object3D::cube() }};
+    engine::o3d::Scene scene{
+        {{0.f, 0.f, rad * dist}, 0.f, 0.f, 0.f}, // camera
+        { // objects
+            engine::o3d::Object3D{
+                engine::o3d::Mesh::cube(),
+                -rad * engine::math::MathVector3(.5f, .5f, .5f),
+                rad, 0.f, 0.f, 0.f
+            },
+            engine::o3d::Object3D{
+                engine::o3d::Mesh::cube(),
+                +rad * engine::math::MathVector3(.5f, .5f, .5f),
+                rad, 0.f, 0.f, 0.f
+            },
+        }
+    };
     auto scale_mat = engine::math::Mat4::scale(rad);
     while (cont) {
-        a.x += .0050f;
-        a.y += .0065f;
-        a.z += .0080f;
+        scene.camera.rot_x += .0050f;
+        scene.camera.rot_y += .0065f;
+        scene.camera.rot_z += .0080f;
 
         fb.clear();
         auto transform_mat =
-            engine::math::Mat4::translate(engine::math::MathVector3{0.f, 0.f, -rad * dist})
-            * engine::math::Mat4::rot_z(a.z)
-            * engine::math::Mat4::rot_y(a.y) * engine::math::Mat4::rot_x(a.x);
+            engine::math::Mat4::translate(-scene.camera.loc)
+            * engine::math::Mat4::rot_x(-scene.camera.rot_x)
+            * engine::math::Mat4::rot_y(-scene.camera.rot_y)
+            * engine::math::Mat4::rot_z(-scene.camera.rot_z);
         std::array<engine::math::Mat4, 2> mats{{
             transform_mat * engine::math::Mat4::translate(engine::math::MathVector3{-.5f * rad, -.5f * rad, -.5f * rad}) * scale_mat,
             transform_mat * engine::math::Mat4::translate(engine::math::MathVector3{+.5f * rad, +.5f * rad, +.5f * rad}) * scale_mat,
@@ -72,15 +89,12 @@ static void scene_main(FB& fb, std::function<bool()> update_frame) {
         auto projection_mat = engine::math::Mat4::projection(static_cast<float>(fb.height()) / static_cast<float>(fb.width()), 2.f, 50.f);
         for (int i = 0; i < 2; i++) {
             auto final_mat = projection_mat * mats[i];
-            for (auto triangle : objs[i]) {
-                engine::o3d::TriangleVertex4 t{triangle};
-
-                t.vertex1.point = final_mat * t.vertex1.point;
-                t.vertex2.point = final_mat * t.vertex2.point;
-                t.vertex3.point = final_mat * t.vertex3.point;
-
-                fb.draw_triangle(t);
-            }
+            const auto& mesh = scene.objs[i].mesh;
+            std::vector<engine::o3d::Vertex4> pts;
+            for (const auto& vert : mesh.pts)
+                pts.push_back({ final_mat * engine::math::MathVector4{vert.point}, vert.data });
+            for (auto face : mesh.faces)
+                fb.draw_triangle({pts[face[0]], pts[face[1]], pts[face[2]]});
         }
         cont = update_frame();
     }
-- 
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