added singleton shader manager, custom widget attribute forward, parse border thickness and color for Border widget, parse and cache uniform locations, remove unused attrubutes code

engine/shader.hpp

@@ -1,25 +1,41 @@
 #pragma once
 #include "util.hpp"
 
+enum class kShaderUniform : uint16_t
+{
+    MVP = const_hash("mvp"),
+    Tex = const_hash("tex"),
+    Col = const_hash("col"),
+};
+
 class Shader
 {
+    std::map<kShaderUniform, GLuint> m_umap;
     GLuint prog;
 public:
-    bool create(std::string vertex, std::string fragment);
+    bool create(const char* vertex, const char* fragment);
     void use();
-    void u_vec4(const char* name, const glm::vec4& v);
-    void u_mat4(const char* name, const glm::mat4& m);
-    void u_int(const char* name, int i);
+    void u_vec4(kShaderUniform id, const glm::vec4& v);
+    void u_mat4(kShaderUniform id, const glm::mat4& m);
+    void u_int(kShaderUniform id, int i);
 };
 
 enum class kShader : uint16_t
 {
-    Color = const_hash("color"),
+    Color       = const_hash("color"),
+    Texture     = const_hash("texture"),
+    UVs         = const_hash("uvs"),
 };
 
 class ShaderManager
 {
+    static std::map<kShader, Shader> m_shaders;
+    static Shader* m_current;
 public:
+    static bool create(kShader id, const char* vertex, const char* fragment);
     static void use(kShader id);
     static void use(const char* name);
+    static void u_vec4(kShaderUniform id, const glm::vec4& v);
+    static void u_mat4(kShaderUniform id, const glm::mat4& m);
+    static void u_int(kShaderUniform id, int i);
 };