added gradient shaders to all primatives

primatives/point.cpp

@@ -32,6 +32,8 @@ namespace UwU {
         } else if (shader.shaderType == VGRADIENT) {
           buffer.drawPixel(x, y, ShaderMethods::gradient(shader.v0, shader.scale, shader.c0, shader.c1, y));
           return;
+        } else if (shader.shaderType == BUFFER) {
+          buffer.drawPixel(x, y, ShaderMethods::buffer(shader.u0, shader.v0, shader.buffer, x, y));
         }
         return;
       }