examples

commit 7d6ab667ba562573e922a302b350e4d834c22f9a
parent 22e782262b947e1bf689cb9f6332ef420c273e4d
Author: Henry Wilson <henry@henryandlizzy.uk>
Date:   Fri, 14 Apr 2023 23:06:54 +0100

gl: Add most basic OpenGL example

Diffstat:
M
Tupfile
 | 
1
+
A
src/gl.c
 | 
27
+++++++++++++++++++++++++++

2 files changed, 28 insertions(+), 0 deletions(-)
diff --git a/Tupfile b/Tupfile
@@ -5,6 +5,7 @@ CXXFLAGS = -std=c++20 $(COMMON_FLAGS)
 
 LDLIBS_aio = -lrt
 LDLIBS_alsa-simple = -lasound
+LDLIBS_gl = -lglfw -lGL
 LDLIBS_gl-asteroids = -lglfw -lGL -lm -lasound
 LDLIBS_io_uring = -luring
 LDLIBS_pulse-async-client = -lpulse
diff --git a/src/gl.c b/src/gl.c
@@ -0,0 +1,27 @@
+#include <GLFW/glfw3.h>
+#include <assert.h>
+
+static void fb_resize_cb(GLFWwindow*, int w, int h)
+{
+	glViewport(0, 0, w, h);
+}
+
+int main(int, char* argv[])
+{
+	assert(glfwInit());
+	GLFWwindow* window = glfwCreateWindow(640, 480, argv[0], NULL, NULL);
+	assert(window);
+	glfwSetFramebufferSizeCallback(window, fb_resize_cb);
+	glfwMakeContextCurrent(window);
+	glfwSwapInterval(1);
+	glClearColor(0, 0, 0, 1);
+
+	while (!glfwWindowShouldClose(window))
+	{
+		glfwPollEvents();
+		glClear(GL_COLOR_BUFFER_BIT);
+		glRectd(-.5,-.5, .5, .5);
+		glfwSwapBuffers(window);
+	}
+	glfwTerminate(); /* Implicit window destroy */
+}