implemented im3d for gl3 and d3d

src/rwbase.h

@@ -61,6 +61,66 @@ typedef uint32 uint;
 
 #define nelem(A) (sizeof(A) / sizeof A[0])
 
+// Lists
+
+struct LLLink
+{
+	LLLink *next;
+	LLLink *prev;
+	void init(void){
+		this->next = nil;
+		this->prev = nil;
+	}
+	void remove(void){
+		this->prev->next = this->next;
+		this->next->prev = this->prev;
+	}
+};
+
+#define LLLinkGetData(linkvar,type,entry) \
+    ((type*)(((uint8*)(linkvar))-offsetof(type,entry)))
+
+// Have to be careful since the link might be deleted.
+#define FORLIST(_link, _list) \
+	for(rw::LLLink *_next = nil, *_link = (_list).link.next; \
+	_next = (_link)->next, (_link) != (_list).end(); \
+	(_link) = _next)
+
+struct LinkList
+{
+	LLLink link;
+	void init(void){
+		this->link.next = &this->link;
+		this->link.prev = &this->link;
+	}
+	bool32 isEmpty(void){
+		return this->link.next == &this->link;
+	}
+	void add(LLLink *link){
+		link->next = this->link.next;
+		link->prev = &this->link;
+		this->link.next->prev = link;
+		this->link.next = link;
+	}
+	void append(LLLink *link){
+		link->next = &this->link;
+		link->prev = this->link.prev;
+		this->link.prev->next = link;
+		this->link.prev = link;
+	}
+	LLLink *end(void){
+		return &this->link;
+	}
+	int32 count(void){
+		int32 n = 0;
+		FORLIST(lnk, (*this))
+			n++;
+		return n;
+	}
+};
+
+// Mathematical types
+
 struct RGBA
 {
 	uint8 red;
@@ -68,6 +128,7 @@ struct RGBA
 	uint8 blue;
 	uint8 alpha;
 };
+inline RGBA makeRGBA(uint8 r, uint8 g, uint8 b, uint8 a) { RGBA c = { r, g, b, a }; return c; }
 inline bool32 equal(const RGBA &c1, const RGBA &c2) { return c1.red == c2.red && c1.green == c2.green && c1.blue == c2.blue && c1.alpha == c2.alpha; }
 
 struct RGBAf