Add render_object function

src/rasteriser/rasteriser.c

@@ -15,6 +15,37 @@ internal list_float *interpolate(Arena *arena, i32 i0, f32 d0, i32 i1, f32 d1);
 
 internal inline void order_triangle_points(triangle_t *triangle);
 
+void render_object(window_t *wnd, Arena *arena, const camera_t *camera,
+                   vec3f_t viewport, const list_vec3f_t *vertices,
+                   const list_scene_triangle_t *triangles) {
+  list_vec2i_t *projected = list_create_with_capacity(
+      vec2i_t, arena, vertices->count * sizeof(vec3f_t));
+  if (!projected) {
+    return;
+  }
+
+  vec3f_t vertex = {0};
+  for (u64 i = 0; i < vertices->count; ++i) {
+    vertex = list_get(vertices, i);
+    list_append(vec2i_t, arena, projected,
+                project_point(vertex, wnd, camera, viewport));
+  }
+
+  for (u64 i = 0; i < triangles->count; ++i) {
+    scene_triangle_t triangle = list_get(triangles, i);
+    triangle_t tri = {
+        .p0 = list_get(projected, triangle.idx0),
+        .p1 = list_get(projected, triangle.idx1),
+        .p2 = list_get(projected, triangle.idx2),
+        .h0 = 1.0f,
+        .h1 = 1.0f,
+        .h2 = 1.0f,
+        .colour = triangle.colour,
+    };
+    draw_wireframe_triangle(wnd, arena, tri);
+  }
+}
+
 void draw_wireframe_triangle(window_t *wnd, Arena *arena, triangle_t triangle) {
   order_triangle_points(&triangle);