add template source from sdl-opengl-bare

.gitignore

@@ -0,0 +1,2 @@
+/build
+/.rsconscache

Makefile

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+.PHONY: default
+default:
+	@rake $@
+
+.PHONY: test
+test:
+	@rake $@
+
+.PHONY: clean
+clean:
+	@rake $@

Rakefile.rb

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+require "bundler"
+Bundler.setup(:default)
+
+require "rake/clean"
+require "rscons"
+
+NAME = "freetype2gl3"
+
+task :default do
+  Rscons::Environment.new do |env|
+    env.build_root = "build"
+    env["LIBS"] += ["SDL2", "GL"]
+    env.Program("^/#{NAME}", Dir["*.{cc,c}"])
+  end
+end
+
+task :clean do
+  Rscons.clean
+end

freetype2gl3.cc

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+#include <SDL2/SDL.h>
+#include <GL/gl.h>
+#include <GL/glu.h>
+
+#define WIDTH   500
+#define HEIGHT  500
+
+void init(void)
+{
+    glClearColor (0.0, 0.0, 0.0, 0.0);
+}
+
+void display(SDL_Window * window)
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    SDL_GL_SwapWindow(window);
+}
+
+int main(int argc, char *argv[])
+{
+    if (SDL_Init(SDL_INIT_VIDEO))
+    {
+        printf("Failed to initialize SDL!\n");
+        return 1;
+    }
+
+    atexit(SDL_Quit);
+
+    SDL_Window * window = SDL_CreateWindow(argv[0],
+                                           SDL_WINDOWPOS_UNDEFINED,
+                                           SDL_WINDOWPOS_UNDEFINED,
+                                           WIDTH,
+                                           HEIGHT,
+                                           SDL_WINDOW_OPENGL);
+    if (!window)
+    {
+        printf("Failed to create window!\n");
+        SDL_Quit();
+        return 2;
+    }
+
+    SDL_GLContext gl_context = SDL_GL_CreateContext(window);
+
+    init();
+    display(window);
+    SDL_Event event;
+    while (SDL_WaitEvent(&event))
+    {
+        if (event.type == SDL_QUIT)
+            break;
+        else if (event.type == SDL_KEYDOWN)
+        {
+            if (event.key.keysym.sym == SDLK_ESCAPE)
+                break;
+            if (event.key.keysym.sym == SDLK_RETURN)
+                display(window);
+        }
+    }
+}