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- #define _GNU_SOURCE
- #include <errno.h>
- #include <fcntl.h>
- #include <stdbool.h>
- #include <stdint.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <sys/mman.h>
- #include <time.h>
- #include <unistd.h>
- #include <xf86drm.h>
- #include <xf86drmMode.h>
- #include <signal.h>
- struct buffer_object {
- uint32_t width;
- uint32_t height;
- uint32_t pitch;
- uint32_t handle;
- uint32_t size;
- uint8_t *vaddr;
- uint32_t fb_id;
- };
- struct buffer_object buf;
- static int modeset_create_fb(int fd, struct buffer_object *bo)
- {
- struct drm_mode_create_dumb create = {};
- struct drm_mode_map_dumb map = {};
- create.width = bo->width;
- create.height = bo->height;
- create.bpp = 32;
- drmIoctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &create);
- bo->pitch = create.pitch;
- bo->size = create.size;
- bo->handle = create.handle;
- // {24, 32}
- drmModeAddFB(fd, bo->width, bo->height, 32, 32, bo->pitch,
- bo->handle, &bo->fb_id);
- map.handle = create.handle;
- drmIoctl(fd, DRM_IOCTL_MODE_MAP_DUMB, &map);
- bo->vaddr = mmap(0, create.size, PROT_READ | PROT_WRITE,
- MAP_SHARED, fd, map.offset);
- //memset(bo->vaddr, 0xff, bo->size);
- int i =0;
- for (i=0;i<bo->size;i+=4) {
- bo->vaddr[i] = 0x0F;
- bo->vaddr[i+1] = 0x00;
- bo->vaddr[i+2] = 0xF0;
- bo->vaddr[i+3] = 0x00;
- }
- return 0;
- }
- static void modeset_destroy_fb(int fd, struct buffer_object *bo)
- {
- struct drm_mode_destroy_dumb destroy = {};
- drmModeRmFB(fd, bo->fb_id);
- munmap(bo->vaddr, bo->size);
- destroy.handle = bo->handle;
- drmIoctl(fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy);
- }
- static int terminate = 0;
- static void sigint_handler(int arg)
- {
- terminate = 1;
- }
- int main(int argc, char **argv)
- {
- int fd;
- drmModeConnector *conn;
- drmModeRes *res;
- uint32_t conn_id;
- uint32_t crtc_id;
- int ret = -1;
- int i =0;
- signal(SIGINT, sigint_handler);
- fd = open("/dev/dri/card0", O_RDWR | O_CLOEXEC);
- res = drmModeGetResources(fd);
- crtc_id = res->crtcs[0];
- conn_id = res->connectors[0];
- conn = drmModeGetConnector(fd, conn_id);
- buf.width = conn->modes[0].hdisplay;
- buf.height = conn->modes[0].vdisplay;
- modeset_create_fb(fd, &buf);
- ret = drmModeSetCrtc(fd, crtc_id, buf.fb_id,
- 0, 0, &conn_id, 1, &conn->modes[0]);
- if (ret) {
- fprintf(stderr, "cannot set CRTC for connector %u (%d): %m\n",
- crtc_id, errno);
- }
- getchar();
- uint32_t cnt = 10;
- uint8_t v1 = 0xFF;
- uint8_t v2 = 0x00;
- uint8_t v3 = 0x00;
- uint8_t v4 = 0x00;
- while (!terminate && cnt--) {
- for (i=0;i<buf.size;i+=4) {
- #if 0
- if (cnt % 2) {
- buf.vaddr[i] = 0x0F;
- buf.vaddr[i+1] = 0x00;
- buf.vaddr[i+2] = 0x00;
- buf.vaddr[i+3] = 0xFF;
- } else {
- buf.vaddr[i] = 0x00;
- buf.vaddr[i+1] = 0xF0;
- buf.vaddr[i+2] = 0xFF;
- buf.vaddr[i+3] = 0x00;
- }
- #else
- buf.vaddr[i] = v1 - cnt * 20;
- buf.vaddr[i+1] = v2 + cnt * 20;
- buf.vaddr[i+2] = v3;
- buf.vaddr[i+3] = v4;
- #endif
- }
- sleep(1);
- }
- modeset_destroy_fb(fd, &buf);
- drmModeFreeConnector(conn);
- drmModeFreeResources(res);
- close(fd);
- return 0;
- }
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