1 files changed, 19 insertions, 1 deletions

diff --git a/src/main.zig b/src/main.zig
index 6d70a14..fbe006e 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -118,6 +118,15 @@ pub fn main() !void {
     defer control.destroy();
 
     var loops: u8 = 0;
+
+    const stdout = std.fs.File.stdout();
+    var tex_buffer: ?[]u8 = null;
+
+    if (!stdout.isTty()) {
+        tex_buffer = try std.heap.c_allocator.alloc(u8, @intCast(config.width * config.height * 4));
+    }
+    defer if (tex_buffer) |buf| std.heap.c_allocator.free(buf);
+
     while (c.glfwWindowShouldClose(window) == c.GL_FALSE) {
         c.glfwMakeContextCurrent(window);
 
@@ -135,7 +144,7 @@ pub fn main() !void {
         //     control.reload_requested = false;
         // }
 
-        {
+        if (control.dirty) {
             c.glFinish();
             var timer = try std.time.Timer.start();
 
@@ -144,6 +153,13 @@ pub fn main() !void {
 
             main_program.bind();
             constants.normalized_quad.draw();
+
+            if (tex_buffer) |buf| {
+                fbo.read(config.width, config.height, buf);
+                std.debug.print("writing {} bytes\n", .{buf.len});
+                _ = try stdout.write(buf);
+            }
+
             fbo.unbind();
 
             c.glFinish();
@@ -152,6 +168,8 @@ pub fn main() !void {
             if (loops == 0) {
                 std.debug.print("\rrendered in {d:.2}ms\n", .{@as(f64, @floatFromInt(fps)) / std.time.ns_per_ms});
             }
+
+            control.dirty = false;
         }
 
         for (outputs.items, 0..) |output, i| {