clients/simple-egl: add delay option

This emulates extra drawing work by usleep().

This is an enhancement to reproduce the problem in the bug report.

Bug: https://bugs.freedesktop.org/show_bug.cgi?id=98833
[Pekka: reordered the help text]
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

diff --git a/clients/simple-egl.c b/clients/simple-egl.c
index 9b6fa1f..c4f72a4 100644 (file)
--- a/clients/simple-egl.c
+++ b/clients/simple-egl.c
@@ -100,7 +100,7 @@ struct window {
        struct ivi_surface *ivi_surface;
        EGLSurface egl_surface;
        struct wl_callback *callback;
-       int fullscreen, opaque, buffer_size, frame_sync;
+       int fullscreen, opaque, buffer_size, frame_sync, delay;
        bool wait_for_configure;
 };
 
@@ -548,6 +548,8 @@ redraw(void *data, struct wl_callback *callback, uint32_t time)
        glDisableVertexAttribArray(window->gl.pos);
        glDisableVertexAttribArray(window->gl.col);
 
+       usleep(window->delay);
+
        if (window->opaque || window->fullscreen) {
                region = wl_compositor_create_region(window->display->compositor);
                wl_region_add(region, 0, 0,
@@ -846,6 +848,7 @@ static void
 usage(int error_code)
 {
        fprintf(stderr, "Usage: simple-egl [OPTIONS]\n\n"
+               "  -d <us>\tBuffer swap delay in microseconds\n"
                "  -f\tRun in fullscreen mode\n"
                "  -o\tCreate an opaque surface\n"
                "  -s\tUse a 16 bpp EGL config\n"
@@ -870,9 +873,12 @@ main(int argc, char **argv)
        window.window_size = window.geometry;
        window.buffer_size = 32;
        window.frame_sync = 1;
+       window.delay = 0;
 
        for (i = 1; i < argc; i++) {
-               if (strcmp("-f", argv[i]) == 0)
+               if (strcmp("-d", argv[i]) == 0 && i+1 < argc)
+                       window.delay = atoi(argv[++i]);
+               else if (strcmp("-f", argv[i]) == 0)
                        window.fullscreen = 1;
                else if (strcmp("-o", argv[i]) == 0)
                        window.opaque = 1;