Finch/examples/window.fch
Nexoniarz f897fb3140 Rename the Finch file extension from .fn to .fch
.fn is already used by other tools (e.g. Fennel). Modules are now looked up as name.fch;
a leftover name.fn gets a clear message telling you to rename it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-08 19:27:42 +02:00

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// A window that slowly changes color. Needs GLFW and OpenGL
// (on Nix they are in shell.nix: run this inside nix-shell).
import "GLFW/glfw3.h"
import "GL/gl.h"
import "math.h"
link "glfw"
link "GL"
fn main() {
if glfwInit() == 0 {
print("could not start GLFW")
return
}
window := glfwCreateWindow(800, 600, "Finch", null, null)
if window == null {
print("could not open a window")
glfwTerminate()
return
}
glfwMakeContextCurrent(window)
while glfwWindowShouldClose(window) == 0 {
t := glfwGetTime()
glClearColor(f32(sin(t) * 0.5 + 0.5), 0.3, 0.6, 1.0)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glfwSwapBuffers(window)
glfwPollEvents()
}
glfwDestroyWindow(window)
glfwTerminate()
}