shader auto reload

src/shader.h

@@ -74,6 +74,7 @@ enum class kShader : uint16_t
 
 class Shader
 {
+    std::map<std::string, struct stat> m_deps;
     std::string m_path;
     std::map<kShaderUniform, GLuint> m_umap;
     GLuint prog;
@@ -82,7 +83,9 @@ public:
     kShader name;
     void parse_error(const char* msg, const char* code);
     bool load(const std::string& path);
+    bool reload();
     bool create(const char* vertex, const char* fragment);
+    void destroy();
     void use();
     void u_vec4(kShaderUniform id, const glm::vec4& v);
     void u_vec3(kShaderUniform id, const glm::vec3& v);
@@ -100,6 +103,7 @@ class ShaderManager
 public:
     static bool ext_framebuffer_fetch;
     static bool load(kShader id, const std::string& path);
+    static bool reload();
     static bool create(kShader id, const char* vertex, const char* fragment);
     static void use(kShader id);
     static void use(const char* name);