add grab output mipmap level feature

src/core/render/renderer.h

@@ -20,6 +20,7 @@
 #define RENDERER_H
 
 #include "glcubemap.h"
+#include "glframebuffer.h"
 #include "glframebuffereffectbase.h"
 #include "renderer_base.h"
 #include "renderer_material.h"
@@ -134,6 +135,7 @@ protected:
 private:
 	float gamma_ = 1.f;
 	int camera_light_mode, cur_write_plane = 0, prev_write_plane = 0;
+	int grab_mipmap = 0, grab_mipmap_f = 0;
 	bool edit_mode, need_init_shaders, need_render_sum, __reinit_debug;
 	Framebuffer fbo_ds, fbo_out;
 	QMap<ShaderRole, QString> shader_files;
@@ -160,6 +162,7 @@ private:
 	QVector<QVector3D> hcontent;
 	QMap<int, QList<Light *>> cur_lights;
 	QVector<FramebufferEffectBase *> fb_effects;
+	FramebufferMipmap img_mips, img_f_mips;
 	QImage last_img;
 	QVector<QVector4D> last_img_f;
 	QString obr_defines, timings;