refactor(render): rename depth player shaders to depth model and clean up

assets/shaders/depth_model_vert.glsl

@@ -7,7 +7,6 @@ uniform mat4 lightSpaceMatrix;
 uniform mat4 modelMatrix;
 
 out vec2 tc;
-flat out int tex_layer;
 
 void main() {
     tc = texCoord;

src/render/shader_manager.cpp

@@ -31,8 +31,8 @@ void ShaderManager::init() {
                     "shaders/water_f_shader.glsl");
     register_shader("player", "shaders/player_v_shader.glsl",
                     "shaders/player_f_shader.glsl");
-    register_shader("player_depth", "shaders/depth_player_shader.glsl",
-                    "shaders/depth_player_fragment_shader.glsl");
+    register_shader("depth_model", "shaders/depth_model_vert.glsl",
+                    "shaders/depth_model_frag.glsl");
     register_shader("rect", "shaders/rect_v_shader.glsl",
                     "shaders/rect_f_shader.glsl");
     register_shader("model_shader", "shaders/model_vert.glsl",

src/render/world_renderer.cpp

@@ -393,7 +393,7 @@ void WorldRenderer::shadow_map_generate(ClientWorld& world) {
         }
     }
     // player
-    auto& player_shadow = m_renderer.get_shader("player_depth");
+    auto& player_shadow = m_renderer.get_shader("depth_model");
     m_player_renderer.shadow_render(player_shadow, light_space_matrix, world);
 }