Add rockchip libdrm rendering backend

Makefile

@@ -21,10 +21,16 @@ ifeq ($(mode), gst)
     CFLAGS += -Wall -pthread -std=gnu99 -D__GST_OPENGL__ -fPIC $(shell pkg-config --cflags glib-2.0) $(shell pkg-config --cflags gstreamer-1.0)
     LDFLAGS += $(shell pkg-config --libs glib-2.0) $(shell pkg-config --libs gstreamer-1.0) $(shell pkg-config --libs gstreamer-video-1.0) -lgstapp-1.0 -lpthread -lrt -lm
     OBJS = main.o osdrender.o osdmavlink.o graphengine.o UAVObj.o m2dlib.o math3d.o osdconfig.o osdvar.o fonts.o font_outlined8x14.o font_outlined8x8.o appsrc.o gst-compat.o
-else
-    CFLAGS += -Wall -pthread -std=gnu99 -D__BCM_OPENVG__ -I$(SYSROOT)/opt/vc/include/ -I$(SYSROOT)/opt/vc/include/interface/vcos/pthreads -I$(SYSROOT)/opt/vc/include/interface/vmcs_host/linux
-    LDFLAGS += -L$(SYSROOT)/opt/vc/lib/ -lbrcmGLESv2 -lbrcmEGL -lopenmaxil -lbcm_host -lvcos -lvchiq_arm -lpthread -lrt -lm
+else ifeq ($(mode), rockchip)
+    CFLAGS += -Wall -pthread -std=gnu99 -D__DRM_ROCKCHIP__ -fPIC $(shell pkg-config --cflags libdrm)
+    LDFLAGS += $(shell pkg-config --libs libdrm) -lpthread -lrt -lm
+    OBJS = main.o osdrender.o osdmavlink.o graphengine.o UAVObj.o m2dlib.o math3d.o osdconfig.o osdvar.o fonts.o font_outlined8x14.o font_outlined8x8.o drm_output.o
+else ifeq ($(mode), rpi3)
+    CFLAGS += -Wall -pthread -std=gnu99 -D__BCM_OPENVG__ -I/opt/vc/include/ -I/opt/vc/include/interface/vcos/pthreads -I/opt/vc/include/interface/vmcs_host/linux
+    LDFLAGS += -L/opt/vc/lib/ -lbrcmGLESv2 -lbrcmEGL -lopenmaxil -lbcm_host -lvcos -lvchiq_arm -lpthread -lrt -lm
     OBJS = main.o osdrender.o osdmavlink.o graphengine.o UAVObj.o m2dlib.o math3d.o osdconfig.o osdvar.o fonts.o font_outlined8x14.o font_outlined8x8.o oglinit.o
+else
+    $(error Valid modes are: gst, rockchip or rpi3)
 endif
 
 all: osd

README.md

@@ -3,7 +3,9 @@ This project started from https://github.com/TobiasBales/PlayuavOSD.git
 Supported platforms:
 -------------------
   * Raspberry Pi 0-3 -- use hardware overlay mode (OpenVG)
-  * Any other Linux with X11 or Wayland -- use GStreamer OpenGL mixer
+  * Radxa Zero 3W/3E -- use hardware overlay mode (libdrm)
+  * OrangePi 5 -- use hardware overlay mode (libdrm)
+  * Any other Linux with X11/Wayland and GPU -- use GStreamer OpenGL mixer
 
 Supported autopilots:
 ---------------------
@@ -16,11 +18,15 @@ Building:
 ---------
 
 1. Build for Linux (X11 or Wayland) (native build):
-  * `apt-get install  gstreamer1.0-tools libgstreamer1.0-dev gstreamer1.0-plugins-base gstreamer1.0-plugins-bad gstreamer1.0-plugins-good gstreamer1.0-plugins-ugly libgstreamer-plugins-base1.0-dev`
+  * `apt-get install gstreamer1.0-tools pkg-config libgstreamer1.0-dev gstreamer1.0-plugins-base gstreamer1.0-plugins-bad gstreamer1.0-plugins-good gstreamer1.0-plugins-ugly libgstreamer-plugins-base1.0-dev`
   * `make osd`
 
 2. Build for Raspberry PI 0-3 (OpenVG) (native build):
-  * `make osd mode=rpi`
+  * `make osd mode=rpi3`
+
+3. Build for Radxa or OrangePi (libdrm) (native build):
+  * `apt-get install libdrm-dev pkg-config`
+  * `make osd mode=rockchip`
 
 Running:
 --------