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2
makefile
Normal file
2
makefile
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test: test.c
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gcc -o test test.c -lxcb -lxcb-util -lcairo -lrt -lxcb-present -lxcb-randr
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340
test.c
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340
test.c
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <cairo/cairo.h>
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#include <cairo/cairo-xcb.h>
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#include <xcb/xcb.h>
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#include <xcb/present.h>
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#include <xcb/xfixes.h>
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#include <xcb/randr.h>
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/************************************************************************************************************/
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/* _ ********************************************************************************************************/
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/************************************************************************************************************/
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static void _draw (void);
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static void _init_cairo (void);
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static void _init_xcb (void);
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static void _reset (void);
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static void _run (void);
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/************************************************************************************************************/
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/************************************************************************************************************/
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/************************************************************************************************************/
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static uint32_t _opt_frame_divider = 1;
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static int _opt_async = 0;
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static xcb_connection_t *_x_con = NULL;
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static xcb_screen_t *_x_scr = NULL;
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static xcb_visualtype_t *_x_vis = NULL;
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static xcb_special_event_t *_x_sev = NULL;
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static xcb_window_t _x_win = 0;
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static xcb_pixmap_t _x_pix = 0;
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static cairo_surface_t *_c_srf = NULL;
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static cairo_t *_c_ctx = NULL;
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static int _speed1 = 60;
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static int _speed2 = 5;
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static double _pos1 = 0;
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static double _inc1 = 1;
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static double _pos2 = 0;
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static double _inc2 = 1;
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static long _t_full = 0;
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static long _t_paint = 0;
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static long _t_xsync = 0;
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static double _delay = 0;
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static double _fps = 0;
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static long _total = 0;
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static uint32_t stamp = 0;
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/************************************************************************************************************/
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/************************************************************************************************************/
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/************************************************************************************************************/
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int
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main(int argc, char **argv)
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{
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/* options */
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int opt;
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while ((opt = getopt(argc, argv, "al:")) != -1) {
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switch (opt) {
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case 'a':
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_opt_async = 1;
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break;
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case 'l':
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_opt_frame_divider = (unsigned int)atoi(optarg);
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break;
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}
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}
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/* program */
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_init_xcb();
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_init_cairo();
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_run();
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_reset();
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return 0;
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}
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/************************************************************************************************************/
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/* _ ********************************************************************************************************/
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/************************************************************************************************************/
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static void
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_draw(void)
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{
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/* background */
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cairo_set_source_rgb(_c_ctx, 0.1, 0.1, 0.1);
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cairo_rectangle(_c_ctx, 0, 0, 700, 700);
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cairo_fill(_c_ctx);
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/* big square */
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double adv1 = (double)(_speed1 * _t_full) / 1000000.0;
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_pos1 += adv1 * _inc1;
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while (_pos1 > 600.0 || _pos1 < 0.0) {
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if (_pos1 > 600.0) {
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_inc1 = -1;
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adv1 = _pos1 - 600;
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_pos1 = 600;
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} else {
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_inc1 = 1;
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adv1 = -_pos1;
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_pos1 = 0;
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}
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_pos1 += adv1 * _inc1;
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}
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cairo_set_source_rgb(_c_ctx, 0.8, 0.8, 0.8);
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cairo_rectangle(_c_ctx, _pos1, _pos1, 100, 100);
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cairo_fill(_c_ctx);
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/* small square */
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double adv2 = (double)(_speed2 * _t_full) / 1000000.0;
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_pos2 += adv2 * _inc2;
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while (_pos2 > 80.0 || _pos2 < 0.0) {
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if (_pos2 > 80.0) {
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_inc2 = -1;
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adv2 = _pos2 - 80;
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_pos2 = 80;
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} else {
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_inc2 = 1;
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adv2 = -_pos2;
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_pos2 = 0;
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}
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_pos2 += adv2 * _inc2;
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}
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cairo_set_source_rgb(_c_ctx, 0.3, 0.3, 0.3);
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cairo_rectangle(_c_ctx, _pos1 + 80 - _pos2, _pos1 + _pos2, 20, 20);
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cairo_fill(_c_ctx);
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/* counters */
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char str[128];
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cairo_set_source_rgb(_c_ctx, 1.0, 1.0, 1.0);
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sprintf(str, "fps : %f", _fps);
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cairo_move_to(_c_ctx, 25, 555);
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cairo_show_text(_c_ctx, str);
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sprintf(str, "frame time (µs) : %li", _t_full);
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cairo_move_to(_c_ctx, 25, 585);
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cairo_show_text(_c_ctx, str);
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sprintf(str, "paint time (µs) : %li", _t_paint);
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cairo_move_to(_c_ctx, 25, 615);
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cairo_show_text(_c_ctx, str);
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sprintf(str, "x sync time (µs) : %li", _t_xsync);
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cairo_move_to(_c_ctx, 25, 645);
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cairo_show_text(_c_ctx, str);
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sprintf(str, "total frames : %li", _total);
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cairo_move_to(_c_ctx, 25, 675);
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cairo_show_text(_c_ctx, str);
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}
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
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static void
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_init_cairo(void)
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{
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_c_srf = cairo_xcb_surface_create(_x_con, _x_pix, _x_vis, 700, 700);
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_c_ctx = cairo_create(_c_srf);
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cairo_set_font_size(_c_ctx, 20);
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cairo_select_font_face(_c_ctx, "Terminus", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
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cairo_surface_flush(_c_srf);
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}
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
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static void
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_init_xcb(void)
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{
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/* connection */
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_x_con = xcb_connect(NULL, NULL);
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_x_scr = xcb_setup_roots_iterator(xcb_get_setup(_x_con)).data;
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xcb_visualtype_iterator_t x_vi;
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xcb_depth_iterator_t x_di;
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x_di = xcb_screen_allowed_depths_iterator(_x_scr);
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for (; x_di.rem; xcb_depth_next(&x_di)) {
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x_vi = xcb_depth_visuals_iterator(x_di.data);
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for (; x_vi.rem; xcb_visualtype_next(&x_vi)) {
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if (_x_scr->root_visual == x_vi.data->visual_id) {
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_x_vis = x_vi.data;
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break;
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}
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}
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}
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/* window */
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uint32_t mask_vals[2];
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mask_vals[0] = _x_scr->black_pixel;
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mask_vals[1] = XCB_EVENT_MASK_EXPOSURE;
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_x_win = xcb_generate_id(_x_con);
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xcb_create_window(
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_x_con,
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XCB_COPY_FROM_PARENT,
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_x_win,
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_x_scr->root,
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0, 0,
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700, 700,
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0,
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XCB_WINDOW_CLASS_INPUT_OUTPUT,
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_x_scr->root_visual,
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XCB_CW_BACK_PIXEL | XCB_CW_EVENT_MASK,
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mask_vals);
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xcb_map_window(_x_con, _x_win);
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xcb_flush(_x_con);
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/* pixmap */
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_x_pix = xcb_generate_id(_x_con);
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xcb_create_pixmap(_x_con, _x_scr->root_depth, _x_pix, _x_win, 700, 700);
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/* present extension */
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uint32_t id = xcb_generate_id(_x_con);
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xcb_present_select_input(
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_x_con,
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id,
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_x_win,
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XCB_PRESENT_EVENT_MASK_COMPLETE_NOTIFY);
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/* optional setup a special event queue for the present extension */
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/* if not done present completion events can still be recoved from the regular */
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/* xcb_wait_for_event() queue */
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_x_sev = xcb_register_for_special_xge(_x_con, &xcb_present_id, id, &stamp);
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/* get frame delay */
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xcb_randr_get_screen_info_cookie_t k = xcb_randr_get_screen_info(_x_con, _x_scr->root);
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xcb_randr_get_screen_info_reply_t *r = xcb_randr_get_screen_info_reply(_x_con, k, NULL);
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_delay = 1000000.0 / (double)r->rate;
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free(r);
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}
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
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static void
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_reset(void)
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{
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cairo_destroy(_c_ctx);
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cairo_surface_destroy(_c_srf);
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xcb_free_pixmap(_x_con, _x_pix);
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xcb_destroy_window(_x_con, _x_win);
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xcb_disconnect(_x_con);
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}
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
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static void
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_run(void)
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{
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xcb_generic_event_t *ev = NULL;
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int n = 0;
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long t1 = 0;
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long t2 = 0;
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long t3 = 0;
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struct timespec ts = {0};
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while (1) {
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_total++;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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t1 = ts.tv_nsec / 1000 + ts.tv_sec * 1000000;
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_draw();
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clock_gettime(CLOCK_MONOTONIC, &ts);
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t2 = ts.tv_nsec / 1000 + ts.tv_sec * 1000000;
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xcb_present_pixmap(
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_x_con,
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_x_win,
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_x_pix,
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123456,
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XCB_XFIXES_REGION_NONE,
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XCB_XFIXES_REGION_NONE,
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0, 0,
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0,
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0,
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0,
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_opt_async ? XCB_PRESENT_OPTION_ASYNC : XCB_PRESENT_OPTION_NONE,
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0, _opt_frame_divider, 0,
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0,
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NULL);
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xcb_flush(_x_con);
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clock_gettime(CLOCK_MONOTONIC, &ts);
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t3 = ts.tv_nsec / 1000 + ts.tv_sec * 1000000;
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_t_paint = t2 - t1;
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_t_xsync = t3 - t2;
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ev = xcb_wait_for_special_event(_x_con, _x_sev);
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if (!ev) {
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printf("exiting\n");
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return;
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}
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free(ev);
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clock_gettime(CLOCK_MONOTONIC, &ts);
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_t_full = ts.tv_nsec / 1000 + ts.tv_sec * 1000000 - t1;
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_fps = 1000000.0 / (double)_t_full;
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}
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}
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