Implement tangent normals and switch to using basic diffuse shader

src/main.c

@@ -5,7 +5,6 @@
 #include "render.h"
 #include "shaders.h"
 #include <stdbool.h>
-#include <stdio.h>
 #include <string.h>
 #include <time.h>
 
@@ -19,7 +18,11 @@ enum {
   TINY_EXIT_MODEL_LOAD_FAILED,
 };
 
-int main(void) {
+int tinyrenderer(void);
+
+int main(void) { return tinyrenderer(); }
+
+int tinyrenderer(void) {
   Arena *arena = NULL;
   if (!wapp_mem_arena_init(&arena, GB(10))) {
     return TINY_EXIT_ARENA_INIT_FAILED;
@@ -33,23 +36,15 @@ int main(void) {
   }
 
   Model obj = load_obj_file(arena, RESOURCE("head.obj"), RESOURCE("head.pnm"),
-                            RESOURCE("head_nm.pnm"));
+                            RESOURCE("head_nm_tangent.pnm"));
   if (IS_INVALID_MODEL(obj)) {
     return TINY_EXIT_MODEL_LOAD_FAILED;
   }
 
-  PhongMaterial material = {
-      .ambient = 0.3f,
-      .diffuse = 1.5f,
-      .specular = 2.0f,
-      .shininess = 1.5f,
-  };
-  obj.material = material;
-
   load_shaders();
 
   clear_buffer(&(render.img), &bg);
-  render_model(&obj, &render, perspective_phong, RENDER_TYPE_SHADED, teal);
+  render_model(&obj, &render, perspective_diffuse, RENDER_TYPE_SHADED, teal);
   save_image(&(render.img), "result.pam");
 
   wapp_mem_arena_destroy(&arena);