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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 -lxcb-present -lcairo -pthread
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346
test.c
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346
test.c
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#include <pthread.h>
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#include <stdlib.h>
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#include <stdio.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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/************************************************************************************************************/
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/************************************************************************************************************/
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/************************************************************************************************************/
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#define WIN_W 600
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#define WIN_H 400
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#define RECT_W 100
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#define RECT_SPEED 5 /* 300 px/s at 60 Hz */
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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_graphics (void);
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static void _init_threads (void);
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static void _reset (void);
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static void * _thread_event (void *p);
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static void * _thread_render (void *p);
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/************************************************************************************************************/
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/************************************************************************************************************/
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/************************************************************************************************************/
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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_window_t _x_win = 0;
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static xcb_pixmap_t _x_pix = 0;
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static xcb_gcontext_t _x_ctx = 0;
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static uint8_t _x_opcode = 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 pthread_t _t_id_ev;
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static pthread_t _t_id_rd;
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static pthread_cond_t _t_cond_rd_1;
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static pthread_cond_t _t_cond_rd_2;
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static pthread_mutex_t _t_mutex_rd_1;
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static pthread_mutex_t _t_mutex_rd_2;
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static int _rect_pos = WIN_W;
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static int _update = 1;
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static int _serial = 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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/* initialisation */
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_init_graphics();
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_init_threads();
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/* initial render for first expose event */
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_draw();
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/* start the threads */
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/* the event thread leads the tempo */
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pthread_create(&_t_id_ev, NULL, _thread_event, NULL);
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pthread_create(&_t_id_rd, NULL, _thread_render, NULL);
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pthread_join(_t_id_ev, NULL);
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pthread_cancel(_t_id_rd);
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pthread_join(_t_id_rd, NULL);
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/* end */
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_reset();
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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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/* update position */
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_rect_pos += RECT_SPEED;
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if (_rect_pos >= WIN_W) {
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_rect_pos = -RECT_W;
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}
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/* update pixmap */
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cairo_set_source_rgb(_c_ctx, 0.3, 0.3, 0.3);
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cairo_paint(_c_ctx);
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cairo_set_source_rgb(_c_ctx, 0.7, 0.7, 0.7);
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cairo_rectangle(_c_ctx, _rect_pos, 0, RECT_W, WIN_H);
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cairo_fill(_c_ctx);
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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_graphics(void)
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{
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/* setup xcb */
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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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/* setup generic xcb graphical context for copying the pixmap */
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_x_ctx = xcb_generate_id(_x_con);
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xcb_create_gc(
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_x_con,
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_x_ctx,
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_x_scr->root,
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XCB_GC_FOREGROUND | XCB_GC_GRAPHICS_EXPOSURES,
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&(uint32_t[2]){_x_scr->black_pixel, 0});
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/* setup xcb 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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XCB_EVENT_MASK_STRUCTURE_NOTIFY |
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XCB_EVENT_MASK_KEY_PRESS |
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XCB_EVENT_MASK_BUTTON_PRESS;
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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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WIN_W, WIN_H,
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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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/* setup xcb 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, WIN_W, WIN_H);
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/* setup xcb present extension */
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xcb_present_select_input(
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_x_con,
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xcb_generate_id(_x_con),
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_x_win,
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XCB_PRESENT_EVENT_MASK_COMPLETE_NOTIFY);
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/* dynamicaly get the present extention opcode for event identification */
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xcb_query_extension_reply_t *r =
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xcb_query_extension_reply(_x_con, xcb_query_extension(_x_con, 7, "Present"), NULL);
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_x_opcode = r->major_opcode;
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free(r);
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/* setup cairo drawable */
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_c_srf = cairo_xcb_surface_create(_x_con, _x_pix, _x_vis, WIN_W, WIN_H);
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_c_ctx = cairo_create(_c_srf);
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/* end */
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cairo_surface_flush(_c_srf);
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xcb_flush(_x_con);
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}
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
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static void
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_init_threads(void)
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{
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pthread_mutex_init(&_t_mutex_rd_1, NULL);
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pthread_mutex_init(&_t_mutex_rd_2, NULL);
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pthread_cond_init(&_t_cond_rd_1, NULL);
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pthread_cond_init(&_t_cond_rd_2, NULL);
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}
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
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void
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_reset(void)
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{
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pthread_mutex_destroy(&_t_mutex_rd_1);
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pthread_mutex_destroy(&_t_mutex_rd_2);
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pthread_cond_destroy(&_t_cond_rd_1);
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pthread_cond_destroy(&_t_cond_rd_2);
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cairo_destroy(_c_ctx);
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cairo_surface_destroy(_c_srf);
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xcb_free_gc(_x_con, _x_ctx);
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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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_thread_event(void *p)
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{
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int run = 1;
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int x_pev_serial;
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xcb_generic_event_t *x_ev;
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xcb_ge_generic_event_t *x_gev;
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xcb_present_complete_notify_event_t *x_pev;
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while (run && (x_ev = xcb_wait_for_event(_x_con))) {
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switch (x_ev->response_type & ~0x80) {
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case XCB_EXPOSE:
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/* immediate update without syncing to the refresh rate */
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/* without it there are visual glitches when resizing the window */
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xcb_copy_area(_x_con, _x_pix, _x_win, _x_ctx, 0, 0, 0, 0, WIN_W, WIN_H);
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break;
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case XCB_BUTTON_PRESS:
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pthread_mutex_lock(&_t_mutex_rd_2);
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_update = !_update;
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pthread_mutex_unlock(&_t_mutex_rd_2);
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pthread_cond_signal(&_t_cond_rd_2);
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break;
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case XCB_KEY_PRESS:
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run = 0;
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break;
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case XCB_GE_GENERIC:
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/* most of this is just checking that we got the right event */
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/* unecessary in simple cases */
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x_gev = (xcb_ge_generic_event_t*)x_ev;
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if (x_gev->extension == _x_opcode && x_gev->event_type == XCB_PRESENT_EVENT_COMPLETE_NOTIFY) {
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x_pev = (xcb_present_complete_notify_event_t*)x_ev;
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pthread_mutex_lock(&_t_mutex_rd_2);
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x_pev_serial = _serial;
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pthread_mutex_unlock(&_t_mutex_rd_2);
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if (x_pev->kind == XCB_PRESENT_COMPLETE_KIND_PIXMAP && x_pev->serial == x_pev_serial) {
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pthread_cond_signal(&_t_cond_rd_1);
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}
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}
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break;
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}
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xcb_flush(_x_con);
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free(x_ev);
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}
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pthread_exit(NULL);
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}
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/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/
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static void *
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_thread_render(void *p)
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{
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pthread_mutex_lock(&_t_mutex_rd_1);
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while (1) {
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/* check if an update is needed, if not, wait */
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pthread_mutex_lock(&_t_mutex_rd_2);
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if (!_update) {
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pthread_cond_wait(&_t_cond_rd_2, &_t_mutex_rd_2);
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}
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pthread_mutex_unlock(&_t_mutex_rd_2);
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/* update pixmap */
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_draw();
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/* update window with pixmap */
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_serial++;
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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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_serial,
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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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XCB_PRESENT_OPTION_NONE,
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0, 0, 0,
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0,
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NULL);
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/* important af, don't forget it */
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xcb_flush(_x_con);
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/* wait for present event notification in the event thread */
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pthread_cond_wait(&_t_cond_rd_1, &_t_mutex_rd_1);
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}
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pthread_mutex_unlock(&_t_mutex_rd_1);
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pthread_exit(NULL);
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}
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