implemented shaders, gradients, and uv mapping

mapper.cpp

@@ -0,0 +1,37 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "datatypes.cpp"
+#include "helpers.cpp"
+
+namespace UwU {
+  class Mapper {
+    public:
+    Mapper(Vec2 offset, Vec2 origin, Matrix4 transformation) {
+      this->offset = offset;
+      this->origin = origin;
+      this->transformation = transformation;
+    }
+    Vec2 offset;             // offset (translation)
+    Vec2 origin;           // origin (for rotation, etc)
+    Matrix4 transformation;  // transformation matrix (for rotation, translation, etc)
+
+    Coord2 map(Coord2 input) {
+      int64_t x1 = (int64_t)transformation.xx * ((int64_t)input.x - (int64_t)origin.x);
+      x1 +=        (int64_t)transformation.xy * ((int64_t)input.y - (int64_t)origin.y);
+      x1 = x1 / 65536;
+      x1 += origin.x;
+      x1 += offset.x;
+      int64_t y1 = (int64_t)transformation.yx * ((int64_t)input.x - (int64_t)origin.x);
+      y1 +=        (int64_t)transformation.yy * ((int64_t)input.y - (int64_t)origin.y);
+      y1 = y1 / 65536;
+      y1 += origin.y;
+      y1 += offset.y;
+      return Coord2((uint16_t)x1, (uint16_t)y1);
+    }
+  };
+}