Example: SDL2 + OpenGL ES2 (+ optionally Emscripten)

Should work with emscripten, as well as mobile hardware.

Inspired by: ocornut#336

examples/sdl_opengles2_example/Makefile

@@ -0,0 +1,60 @@
+#
+# Cross Platform Makefile
+# Compatible with MSYS2/MINGW, Ubuntu 14.04.1 and Mac OS X
+#
+#
+# You will need SDL2 (http://www.libsdl.org)
+#
+#   apt-get install libsdl2-dev  # Linux
+#   brew install sdl2            # Mac OS X
+#   pacman -S mingw-w64-i686-SDL # MSYS2
+#
+
+#CXX = g++
+
+EXE = sdl_opengles2_example
+OBJS = main.o imgui_impl_sdl_gles2.o
+OBJS += ../../imgui.o ../../imgui_demo.o ../../imgui_draw.o
+
+UNAME_S := $(shell uname -s)
+
+
+ifeq ($(UNAME_S), Linux) #LINUX
+	ECHO_MESSAGE = "Linux"
+	LIBS = -lGLESv2 -ldl `sdl2-config --libs`
+
+	CXXFLAGS = -I../../ `sdl2-config --cflags`
+	CXXFLAGS += -Wall -Wformat
+	CFLAGS = $(CXXFLAGS)
+endif
+
+ifeq ($(UNAME_S), Darwin) #APPLE
+	ECHO_MESSAGE = "Mac OS X"
+	LIBS = -framework OpenGL -framework Cocoa -framework IOKit -framework CoreVideo `sdl2-config --libs`
+
+	CXXFLAGS = -I../../ -I/usr/local/include `sdl2-config --cflags`
+	CXXFLAGS += -Wall -Wformat
+	CFLAGS = $(CXXFLAGS)
+endif
+
+ifeq ($(findstring MINGW,$(UNAME_S)),MINGW)
+   ECHO_MESSAGE = "Windows"
+   LIBS = -lgdi32 -limm32 `pkg-config --static --libs sdl2`
+
+   CXXFLAGS = -I../../ `pkg-config --cflags sdl2`
+   CXXFLAGS += -Wall -Wformat
+   CFLAGS = $(CXXFLAGS)
+endif
+
+
+.cpp.o:
+	$(CXX) $(CXXFLAGS) -c -o $@ $<
+
+all: $(EXE)
+	@echo Build complete for $(ECHO_MESSAGE)
+
+$(EXE): $(OBJS)
+	$(CXX) -o $(EXE) $(OBJS) $(CXXFLAGS) $(LIBS)
+
+clean:
+	rm $(EXE) $(OBJS)

examples/sdl_opengles2_example/README.md

@@ -0,0 +1,13 @@
+
+# How to Build
+
+- On Linux and similar Unixes
+
+```
+c++ `sdl2-config --cflags` -I ../.. main.cpp imgui_impl_sdl_gles2.cpp ../../imgui*.cpp `sdl2-config --libs` -lGLESv2 -ldl -o sdl2_opengles2_example
+```
+- Emscripten
+
+```
+em++ -O2 -s USE_SDL=2 -I ../.. main.cpp imgui_impl_sdl.cpp ../../imgui*.cpp -o html/index.html
+```