Remove backpack model and replace it with Suzanne

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "src/assimp"]
+	path = src/assimp
+	url = git@github.com:assimp/assimp

models/backpack/backpack.mtl

@@ -1,16 +0,0 @@
-# Blender MTL File: 'None'
-# Material Count: 1
-
-newmtl Scene_-_Root
-Ns 225.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.0 0.0 0.0
-Ni 1.450000
-d 1.000000
-illum 2
-map_Kd diffuse.jpg
-map_Bump normal.png
-map_Ks specular.jpg
-

models/backpack/source_attribution.txt

@@ -1,3 +0,0 @@
-Model by Berk Gedik, from: https://sketchfab.com/3d-models/survival-guitar-backpack-low-poly-799f8c4511f84fab8c3f12887f7e6b36
-
-Modified material assignment (Joey de Vries) for easier load in OpenGL model loading chapter, and renamed albedo to diffuse and metallic to specular to match non-PBR lighting setup.

models/suzanne/suzanne.mtl

@@ -0,0 +1,12 @@
+# Blender 4.3.2 MTL File: 'None'
+# www.blender.org
+
+newmtl Material
+Ka 1.000000 1.000000 1.000000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.450000
+d 1.000000
+illum 2
+map_Kd diffuse.png
+map_Ks specular.png

src/assimp

@@ -1 +1 @@
-Subproject commit 258cdfd2bc29a920bbe749962abbcd58caa76422
+Subproject commit c35200e38ea8f058812b83de2ef32c6093b0ece2

src/main.cc

@@ -164,8 +164,6 @@ int main() {
   SDL_SetRelativeMouseMode(SDL_TRUE);
   SDL_WarpMouseInWindow(window, WINDOW_HALF_WIDTH, WINDOW_HALF_HEIGHT);
 
-  stbi_set_flip_vertically_on_load(true);
-
   glViewport(0, 0, WINDOW_WIDTH, WINDOW_HEIGHT);
 
   glEnable(GL_DEPTH_TEST);
@@ -213,7 +211,7 @@ int main() {
     13, 15, 16
   };
 
-  Model backpack = {"models/backpack/backpack.obj"};
+  Model backpack = {"models/suzanne/suzanne.obj"};
   Mesh light     = {vertices, indices, {}};
 
   Shader main_shader  {"shaders/vert.glsl", "shaders/frag.glsl"};
@@ -244,18 +242,18 @@ int main() {
     glm::vec3( 0.7f,  0.2f,  2.0f),
     glm::vec3( 2.3f, -3.3f, -4.0f),
     glm::vec3(-4.0f,  2.0f, -12.0f),
-    glm::vec3( 0.0f,  0.0f, -3.0f)
+    glm::vec3( 1.0f,  0.0f, -18.0f)
   };
 
   // Setup lights
   main_shader.set_vec3("directional_light.direction", glm::vec3(-0.2f, -1.0f, -0.3f));
   main_shader.set_vec3("directional_light.ambient", light_ambient);
-  main_shader.set_vec3("directional_light.diffuse", light_diffuse);
+  main_shader.set_vec3("directional_light.diffuse", light_diffuse * 0.25f);
   main_shader.set_vec3("directional_light.specular", light_specular);
 
   main_shader.set_vec3("spot_light.ambient", light_ambient);
-  main_shader.set_vec3("spot_light.diffuse", light_diffuse);
+  main_shader.set_vec3("spot_light.diffuse", light_diffuse * 0.5f);
-  main_shader.set_vec3("spot_light.specular", light_specular);
+  main_shader.set_vec3("spot_light.specular", light_specular * 0.25f);
 
   for (int i = 0; i < point_light_positions.size(); ++i) {
     char base[256]      = {0};
@@ -278,8 +276,8 @@ int main() {
 
     main_shader.set_vec3(position, point_light_positions[i]);
     main_shader.set_vec3(ambient, light_ambient);
-    main_shader.set_vec3(diffuse, light_diffuse);
+    main_shader.set_vec3(diffuse, light_diffuse * 0.25f);
-    main_shader.set_vec3(specular, light_specular);
+    main_shader.set_vec3(specular, light_specular * 0.5f);
     main_shader.set_float(constant, 1.0f);
     main_shader.set_float(linear, 0.09f);
     main_shader.set_float(quadratic, 0.032f);