From eae60acb14c2d030df13318056b6cca02b2bdbe3 Mon Sep 17 00:00:00 2001
From: Josh Holtrop <jholtrop@gmail.com>
Date: Sun, 11 Oct 2015 15:20:25 -0400
Subject: [PATCH] import sdl-opengl-bare template

---
 .gitignore |  1 +
 Makefile   | 21 ++++++++++++++
 app.cc     | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 104 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Makefile
 create mode 100644 app.cc

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6750dba
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+/app
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..d81003d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,21 @@
+FILE := app
+TARGET := $(FILE)
+
+CCFLAGS := $(shell sdl2-config --cflags)
+ifeq (MINGW,$(findstring MINGW,$(shell uname)))
+LIBS := -lopengl32 -lglu32 -lmingw32
+CXX := mingw32-g++
+TARGET := $(TARGET).exe
+else
+LIBS := -lGL -lGLU `sdl2-config --libs`
+endif
+LDFLAGS := $(LIBS) $(shell sdl2-config --libs)
+
+
+all:	$(TARGET)
+
+$(TARGET): $(FILE).cc
+	$(CXX) -o $(TARGET) $(CCFLAGS) $< $(LDFLAGS)
+
+clean:
+	-rm -f $(TARGET) *~ *.o
diff --git a/app.cc b/app.cc
new file mode 100644
index 0000000..00d1d46
--- /dev/null
+++ b/app.cc
@@ -0,0 +1,82 @@
+#include <SDL.h>
+#include <GL/gl.h>
+#include <GL/glu.h>
+#include <stdio.h>
+
+#define WIDTH   800
+#define HEIGHT  800
+
+void init(void)
+{
+    glClearColor (0.0, 0.0, 0.0, 0.0);
+    glEnable(GL_DEPTH_TEST);
+    glShadeModel(GL_FLAT);
+    glViewport(0, 0, WIDTH, HEIGHT);
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glOrtho(-0.5, WIDTH - 0.5, -0.5, HEIGHT - 0.5, -1, 1);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+}
+
+void display(SDL_Window * window)
+{
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glColor3f(1, 1, 1);
+    glBegin(GL_QUADS);
+        glVertex3f(10, HEIGHT / 2, 0.0);
+        glVertex3f(10, 3 * HEIGHT / 4, 0.0);
+        glVertex3f(WIDTH / 2, 3 * HEIGHT / 4, 0.0);
+        glVertex3f(WIDTH / 2, HEIGHT / 2, 0.0);
+    glEnd();
+    glColor3f(1, 0.6, 0);
+    glBegin(GL_LINE_LOOP);
+        glVertex2f(0, 0);
+        glVertex2f(WIDTH - 1, 0);
+        glVertex2f(WIDTH - 1, HEIGHT - 1);
+        glVertex2f(0, HEIGHT - 1);
+    glEnd();
+    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);
+        }
+    }
+}