Initial commit.

1 files changed, 295 insertions, 0 deletions

diff --git a/gltfview/src/game.c b/gltfview/src/game.c
new file mode 100644
index 0000000..d7352d4
--- /dev/null
+++ b/gltfview/src/game.c
@@ -0,0 +1,295 @@
+#include "game.h"
+
+#include <gfx/error.h>
+#include <gfx/render_backend.h>
+#include <gfx/scene/light.h>
+#include <gfx/scene/material.h>
+#include <gfx/scene/mesh.h>
+#include <gfx/scene/node.h>
+#include <gfx/scene/object.h>
+#include <gfx/util/geometry.h>
+#include <gfx/util/ibl.h>
+#include <gfx/util/scene.h>
+#include <gfx/util/shader.h>
+#include <gfx/util/skyquad.h>
+#include <gfx/util/texture.h>
+
+#include <log/log.h>
+#include <math/camera.h>
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h> // usleep; TODO Remove.
+
+// Paths to various scene files.
+static const char* BOX = "/assets/models/box.gltf";
+static const char* SUZANNE = "/assets/models/suzanne.gltf";
+static const char* SPONZA =
+    "/assets/glTF-Sample-Models/2.0/Sponza/glTF/Sponza.gltf";
+static const char* FLIGHT_HELMET =
+    "/assets/glTF-Sample-Models/2.0/FlightHelmet/glTF/FlightHelmet.gltf";
+static const char* DAMAGED_HELMET =
+    "/assets/glTF-Sample-Models/2.0/DamagedHelmet/glTF/DamagedHelmet.gltf";
+
+#define DEFAULT_SCENE_FILE DAMAGED_HELMET
+
+static const char* CLOUDS1_TEXTURE = "/assets/skybox/clouds1/clouds1_west.bmp";
+
+static ShaderProgram* load_shader(RenderBackend* render_backend,
+                                  const char* view_mode) {
+  ShaderProgram* shader = 0;
+  if (strcmp(view_mode, "debug") == 0) {
+    shader = gfx_make_debug3d_shader(render_backend);
+  } else if (strcmp(view_mode, "normals") == 0) {
+    shader = gfx_make_view_normals_shader(render_backend);
+  } else if (strcmp(view_mode, "normal_mapped_normals") == 0) {
+    shader = gfx_make_view_normal_mapped_normals_shader(render_backend);
+  } else if (strcmp(view_mode, "tangents") == 0) {
+    shader = gfx_make_view_tangents_shader(render_backend);
+  } else {
+    shader = gfx_make_cook_torrance_shader(render_backend);
+  }
+  return shader;
+}
+
+/// Loads the skyquad texture.
+static Texture* load_environment_map(RenderBackend* render_backend) {
+  return gfx_load_texture(
+      render_backend,
+      &(LoadTextureCmd){
+          .origin = TextureFromFile,
+          .type = LoadCubemap,
+          .colour_space = sRGB,
+          .filtering = NearestFiltering,
+          .mipmaps = false,
+          .data.cubemap.filepaths = {
+              mstring_make("/assets/skybox/clouds1/clouds1_east.bmp"),
+              mstring_make("/assets/skybox/clouds1/clouds1_west.bmp"),
+              mstring_make("/assets/skybox/clouds1/clouds1_up.bmp"),
+              mstring_make("/assets/skybox/clouds1/clouds1_down.bmp"),
+              mstring_make("/assets/skybox/clouds1/clouds1_north.bmp"),
+              mstring_make("/assets/skybox/clouds1/clouds1_south.bmp")}});
+}
+
+/// Creates an object to render the skyquad in the background.
+static SceneNode* make_skyquad_object_node(Game* game,
+                                           const Texture* environment_map) {
+  assert(game);
+
+  SceneObject* skyquad_object =
+      gfx_make_skyquad(game->gfx, game->scene, environment_map);
+  if (!skyquad_object) {
+    return 0;
+  }
+  SceneNode* skyquad_node = gfx_make_object_node(skyquad_object);
+  if (!skyquad_node) {
+    return 0;
+  }
+  gfx_set_node_parent(skyquad_node, gfx_get_scene_root(game->scene));
+  return skyquad_node;
+}
+
+/// Creates an environment light.
+static SceneNode* make_environment_light(Game* game,
+                                         const Texture* environment_light) {
+  assert(game);
+
+  Light* light = gfx_make_light(&(LightDesc){
+      .type = EnvironmentLightType,
+      .light = (EnvironmentLightDesc){.environment_map = environment_light}});
+  if (!light) {
+    return 0;
+  }
+  SceneNode* light_node = gfx_make_light_node(light);
+  if (!light_node) {
+    return 0;
+  }
+  gfx_set_node_parent(light_node, gfx_get_scene_root(game->scene));
+  return light_node;
+}
+
+/// Loads the skyquad and returns the SceneNode with the environment light.
+static bool load_skyquad(Game* game, SceneNode** node) {
+  assert(game);
+  assert(node);
+
+  Texture* environment_map = load_environment_map(game->render_backend);
+  if (!environment_map) {
+    return false;
+  }
+
+  make_skyquad_object_node(game, environment_map);
+  *node = make_environment_light(game, environment_map);
+
+  return true;
+}
+
+/// Loads the 3D scene.
+static bool load_scene(Game* game, const char* scene_filepath,
+                       const char* view_mode) {
+  assert(game);
+
+  game->camera = gfx_make_camera();
+  if (!game->camera) {
+    return false;
+  }
+  Camera* camera = gfx_get_camera_camera(game->camera);
+  // Sponza.
+  // spatial3_set_position(&camera->spatial, vec3_make(0, 100, 50));
+  // Damaged helmet.
+  spatial3_set_position(&camera->spatial, vec3_make(0, 0, 2));
+
+  SceneNode* sky_node = 0;
+  if (!load_skyquad(game, &sky_node) || !sky_node) {
+    return false;
+  }
+
+  ShaderProgram* shader = load_shader(game->render_backend, view_mode);
+  if (!shader) {
+    return false;
+  }
+
+  if (!gfx_load_scene(game->gfx, sky_node, shader,
+                      &(LoadSceneCmd){.origin = SceneFromFile,
+                                      .filepath = scene_filepath})) {
+    return false;
+  }
+
+  return true;
+}
+
+/// Loads a scene for debugging textures.
+static bool load_texture_debugger_scene(Game* game) {
+  assert(game);
+
+  Texture* texture =
+      gfx_load_texture(game->render_backend,
+                       &(LoadTextureCmd){.origin = TextureFromFile,
+                                         .type = LoadTexture,
+                                         .filtering = LinearFiltering,
+                                         .mipmaps = false,
+                                         .data.texture.filepath =
+                                             mstring_make(CLOUDS1_TEXTURE)});
+
+  game->camera = gfx_make_camera();
+  if (!game->camera) {
+    return false;
+  }
+  Camera* camera = gfx_get_camera_camera(game->camera);
+  spatial3_set_position(&camera->spatial, vec3_make(0, 0, 1));
+
+  ShaderProgram* shader = gfx_make_view_texture_shader(game->render_backend);
+  if (!shader) {
+    return false;
+  }
+
+  Geometry* geometry = gfx_make_quad_11(game->render_backend);
+  if (!geometry) {
+    return false;
+  }
+
+  MaterialDesc material_desc = (MaterialDesc){0};
+  material_desc.shader = shader;
+  material_desc.uniforms[0] = (ShaderUniform){.type = UniformTexture,
+                                              .value.texture = texture,
+                                              .name = sstring_make("Texture")};
+  material_desc.num_uniforms = 1;
+  Material* material = gfx_make_material(&material_desc);
+  if (!material) {
+    return false;
+  }
+
+  MeshDesc mesh_desc = (MeshDesc){0};
+  mesh_desc.geometry = geometry;
+  mesh_desc.material = material;
+  Mesh* mesh = gfx_make_mesh(&mesh_desc);
+  if (!mesh) {
+    return false;
+  }
+
+  SceneObject* object = gfx_make_object();
+  if (!object) {
+    return false;
+  }
+  gfx_add_object_mesh(object, mesh);
+
+  SceneNode* node = gfx_make_object_node(object);
+  SceneNode* root = gfx_get_scene_root(game->scene);
+  gfx_set_node_parent(node, root);
+
+  return true;
+}
+
+bool game_new(Game* game, int argc, const char** argv) {
+  // TODO: getopt() to implement proper argument parsing.
+  const char* view_mode = argc > 1 ? argv[1] : "";
+  const char* scene_filepath = argc > 2 ? argv[2] : DEFAULT_SCENE_FILE;
+
+  game->gfx = gfx_init();
+  if (!game->gfx) {
+    goto cleanup;
+  }
+
+  game->render_backend = gfx_get_render_backend(game->gfx);
+  game->renderer = gfx_get_renderer(game->gfx);
+
+  game->scene = gfx_make_scene(game->gfx);
+  if (!game->scene) {
+    goto cleanup;
+  }
+
+  if (!load_scene(game, scene_filepath, view_mode)) {
+    goto cleanup;
+  }
+  /*if (!load_texture_debugger_scene(game)) {
+    goto cleanup;
+  }*/
+
+  return true;
+
+cleanup:
+  LOGE("Gfx error: %s", gfx_get_error());
+  if (game->scene) {
+    gfx_destroy_scene(game->gfx, &game->scene);
+  }
+  if (game->gfx) {
+    gfx_destroy(&game->gfx);
+  }
+  return false;
+}
+
+void game_end(Game* game) { gfx_destroy(&game->gfx); }
+
+void game_update(Game* game, double t, double dt) {
+  game->elapsed += dt;
+  while (game->elapsed >= 1.0) {
+    // LOGD("Tick");
+    usleep(1000);
+    game->elapsed -= 1.0;
+  }
+  Camera* camera = gfx_get_camera_camera(game->camera);
+  spatial3_orbit(&camera->spatial, vec3_make(0, 0, 0),
+                 /*radius=*/2,
+                 /*azimuth=*/t * 0.5, /*zenith=*/0);
+  spatial3_lookat(&camera->spatial, vec3_make(0, 0, 0));
+}
+
+void game_render(const Game* game) {
+  gfx_render_scene(game->renderer, game->render_backend, game->scene,
+                   game->camera);
+}
+
+void game_set_viewport(Game* game, int width, int height) {
+  gfx_set_viewport(game->render_backend, width, height);
+
+  const R fovy = 90 * TO_RAD;
+  const R aspect = (R)width / (R)height;
+  const R near = 0.1;
+  const R far = 1000;
+  const mat4 projection = mat4_perspective(fovy, aspect, near, far);
+
+  Camera* camera = gfx_get_camera_camera(game->camera);
+  camera->projection = projection;
+}