initial commit

diff --git a/.gitignore b/.gitignore
new file mode 100644 (file)
index 0000000..2b8e30d
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+build/
+*.sublime-project
+*.sublime-workspace
+tags
+sim
\ No newline at end of file

diff --git a/Makefile b/Makefile
new file mode 100644 (file)
index 0000000..731481f
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,35 @@
+RELEASE=0
+
+OBJ_FILES=\
+       build/sim.o
+
+ifeq (, $(shell which tcc))
+       CC=gcc
+else
+ifeq ($(RELEASE), 0)
+       CC=gcc
+else
+       CC=tcc
+endif
+endif
+
+INCLUDES=-I./include
+LIBS=-lGL -lglfw
+TARGET=./sim
+
+ifeq ($(RELEASE), 1)
+       FLAGS=-O3
+else
+       FLAGS=-g3
+endif
+
+build/%.o: src/%.c
+       $(CC) $(TIMEFLAG) $(FLAGS) -c $< -o $@ $(INCLUDES)
+
+$(TARGET): $(OBJ_FILES)
+       $(CC) $(TIMEFLAG) $(FLAGS) $(OBJ_FILES) -o $@ $(LIBS)
+
+clean:
+       rm -f $(OBJ_FILES) 2>&1 >/dev/null
+
+all: ./sim

diff --git a/src/sim.c b/src/sim.c
new file mode 100644 (file)
index 0000000..fbd700c
--- /dev/null
+++ b/src/sim.c
@@ -0,0 +1,64 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <malloc.h>
+#include <stdarg.h>
+#include <unistd.h>
+
+#include <GLES3/gl3.h>
+#include <GLFW/glfw3.h>
+
+#define WINDOW_WIDTH           1600
+#define WINDOW_HEIGHT          900
+#define WINDOW_TITLE           "N-Body Simulation"
+
+void __attribute__((noreturn)) panic_and_die(char* msg, ...) {
+       puts("************ PANIC ************");
+
+       va_list va;
+       va_start(va, msg);
+       vprintf(msg, va);
+       va_end(va);
+
+       exit(1);
+}
+
+void glfw_key_handler(GLFWwindow* window, int key, int scancode, int action, int mods) {
+       if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+               glfwSetWindowShouldClose(window, 1);
+}
+
+GLFWwindow* window;
+void init_opengl() {
+       if (!glfwInit()) panic_and_die("Failed to initalize GLFW.");
+
+       window = glfwCreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, WINDOW_TITLE, NULL, NULL);
+       glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+       glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
+       glfwMakeContextCurrent(window);
+
+       glfwSetKeyCallback(window, glfw_key_handler);
+}
+
+void deinit_opengl() {
+       glfwDestroyWindow(window);
+}
+
+void draw() {
+       glClearColor(1.0, 0.0, 1.0, 1.0);
+       glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+       glfwSwapBuffers(window);
+}
+
+void loop() {
+       while (!glfwWindowShouldClose(window)) {
+               glfwPollEvents();
+
+               draw();
+       }
+}
+
+int main(int argc, char* argv[]) {
+       init_opengl();
+       loop();
+       deinit_opengl();
+}
\ No newline at end of file