Merge pull request #10 from omnisci3nce/cel-41-port-over-a-basic-3d-scene-example

Cel 41 port over a basic 3d scene example

1 files changed, 88 insertions, 0 deletions

diff --git a/examples/transforms/ex_transforms.c b/examples/transforms/ex_transforms.c
new file mode 100644
index 0000000..689c49d
--- /dev/null
+++ b/examples/transforms/ex_transforms.c
@@ -0,0 +1,88 @@
+#include <glfw3.h>
+
+#include "core.h"
+#include "maths.h"
+#include "maths_types.h"
+#include "mem.h"
+#include "render.h"
+#include "render_types.h"
+#include "transform_hierarchy.h"
+
+const vec3 pointlight_positions[4] = {
+  { 0.7, 0.2, 2.0 },
+  { 2.3, -3.3, -4.0 },
+  { -4.0, 2.0, -12.0 },
+  { 0.0, 0.0, -3.0 },
+};
+point_light point_lights[4];
+
+int main() {
+  core* core = core_bringup();
+
+  // Set up scene
+  vec3 camera_pos = vec3(3., 4., 10.);
+  vec3 camera_front = vec3_normalise(vec3_negate(camera_pos));
+  camera cam = camera_create(camera_pos, camera_front, VEC3_Y, deg_to_rad(45.0));
+
+  model_handle cube_handle = model_load_obj(core, "assets/models/obj/cube/cube.obj", true);
+  model* cube = &core->models->data[cube_handle.raw];
+  model_upload_meshes(&core->renderer, cube);
+
+  directional_light dir_light = { .direction = (vec3){ -0.2, -1.0, -0.3 },
+                                  .ambient = (vec3){ 0.2, 0.2, 0.2 },
+                                  .diffuse = (vec3){ 0.5, 0.5, 0.5 },
+                                  .specular = (vec3){ 1.0, 1.0, 1.0 } };
+  // point lights setup
+  for (int i = 0; i < 4; i++) {
+    point_lights[i].position = pointlight_positions[i];
+    point_lights[i].ambient = (vec3){ 0.05, 0.05, 0.05 };
+    point_lights[i].diffuse = (vec3){ 0.8, 0.8, 0.8 };
+    point_lights[i].specular = (vec3){ 1.0, 1.0, 1.0 };
+    point_lights[i].constant = 1.0;
+    point_lights[i].linear = 0.09;
+    point_lights[i].quadratic = 0.032;
+  }
+
+  scene our_scene = { .dir_light = dir_light, .n_point_lights = 4 };
+  memcpy(&our_scene.point_lights, &point_lights, sizeof(point_light[4]));
+
+  // Create transform hierarchy
+  transform_hierarchy* transform_tree = transform_hierarchy_create();
+  transform_node* root_node = transform_hierarchy_root_node(transform_tree);
+  // Add nodes
+  // -- 4 cubes
+  transform cube1 = transform_create(vec3(0.0, -2.0, 0.0), quat_ident(), 0.8);
+  transform cube2 = transform_create(vec3(0.0, 1.0, 0.0), quat_ident(), 1.0);
+  transform cube3 = transform_create(vec3(0.0, 1.0, 0.0), quat_ident(), 1.0);
+  transform cube4 = transform_create(vec3(0.0, 1.0, 0.0), quat_ident(), 1.0);
+  transform_node* node1 = transform_hierarchy_add_node(root_node, cube_handle, cube1);
+  transform_node* node2 = transform_hierarchy_add_node(node1, cube_handle, cube2);
+  transform_node* node3 = transform_hierarchy_add_node(node2, cube_handle, cube3);
+  transform_node* node4 = transform_hierarchy_add_node(node3, cube_handle, cube4);
+
+  transform_hierarchy_debug_print(root_node, core);
+
+  char* frame_allocator_storage = malloc(1024 * 1024 * 64);
+  arena frame_arena = arena_create(frame_allocator_storage, 1024 * 1024 * 64);
+
+  // Main loop
+  while (!glfwWindowShouldClose(core->renderer.window)) {
+    input_update(&core->input);
+    threadpool_process_results(&core->threadpool, 1);
+
+    render_frame_begin(&core->renderer);
+    transform_hierarchy_propagate_transforms(transform_tree);
+
+    // TODO: Add setters to transform API
+    node1->tf.position.x += 0.004;
+    node1->tf.is_dirty = true;
+    draw_scene(&frame_arena, core->models, &core->renderer, &cam, transform_tree, &our_scene);
+
+    render_frame_end(&core->renderer);
+    arena_free_all(&frame_arena);
+  }
+
+  transform_hierarchy_free(transform_tree);
+
+  return 0;
+}