feat: added phong and basic shaders, updated mesh format

assets/shaders/phong-solid.vertex.glsl

@@ -0,0 +1,26 @@
+#version 330 core
+layout (location = 0) in vec3 a_xyz;
+layout (location = 1) in vec2 a_uv;
+layout (location = 2) in vec3 a_normal;
+
+uniform mat4 model;
+uniform mat4 view;
+uniform mat4 projection;
+uniform vec3 light_pos;
+
+out vec3 normal_cameraspace;
+out vec3 light_direction_cameraspace;
+out vec3 eye_direction_cameraspace;
+out vec3 position_worldspace;
+
+void main() {
+    vec3 vertex_cameraspace = (view * model * vec4(a_xyz, 1)).xyz;
+    vec3 light_pos_cameraspace = (view * vec4(light_pos, 1)).xyz;
+
+    normal_cameraspace = (transpose(inverse(view * model)) * vec4(a_normal, 0)).xyz;
+    light_direction_cameraspace = light_pos_cameraspace + eye_direction_cameraspace;
+    eye_direction_cameraspace = vec3(0, 0, 0) - vertex_cameraspace;
+    position_worldspace = (model * vec4(a_xyz, 1)).xyz;
+
+    gl_Position = projection * view * model * vec4(a_xyz, 1);
+}