arvin.zhu
126 lines
2.9 KiB
C
Executable File
126 lines
2.9 KiB
C
Executable File
#define _GNU_SOURCE
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#include <errno.h>
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#include <fcntl.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <time.h>
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#include <unistd.h>
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#include <xf86drm.h>
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#include <xf86drmMode.h>
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#define DRM_MODULE_NAME "starfive"
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#define DRM_BUSID NULL
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struct buffer_object {
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uint32_t width;
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uint32_t height;
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uint32_t pitch;
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uint32_t handle;
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uint32_t size;
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uint32_t *vaddr;
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uint32_t fb_id;
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};
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struct buffer_object buf[2];
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static int modeset_create_fb(int fd, struct buffer_object *bo, uint32_t color)
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{
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struct drm_mode_create_dumb create = {};
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struct drm_mode_map_dumb map = {};
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uint32_t i;
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create.width = bo->width;
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create.height = bo->height;
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create.bpp = 32;
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drmIoctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &create);
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bo->pitch = create.pitch;
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bo->size = create.size;
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bo->handle = create.handle;
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// {24, 32}
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drmModeAddFB(fd, bo->width, bo->height, 32, 32, bo->pitch,
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bo->handle, &bo->fb_id);
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map.handle = create.handle;
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drmIoctl(fd, DRM_IOCTL_MODE_MAP_DUMB, &map);
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bo->vaddr = mmap(0, create.size, PROT_READ | PROT_WRITE,
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MAP_SHARED, fd, map.offset);
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for (i = 0; i < (bo->size / 4); i++)
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bo->vaddr[i] = color;
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return 0;
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}
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static void modeset_destroy_fb(int fd, struct buffer_object *bo)
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{
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struct drm_mode_destroy_dumb destroy = {};
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drmModeRmFB(fd, bo->fb_id);
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munmap(bo->vaddr, bo->size);
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destroy.handle = bo->handle;
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drmIoctl(fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy);
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}
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int main(int argc, char **argv)
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{
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int fd;
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drmModeConnector *conn;
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drmModeRes *res;
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uint32_t conn_id;
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uint32_t crtc_id;
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int ret = -1;
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fd = drmOpen(DRM_MODULE_NAME, DRM_BUSID);
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res = drmModeGetResources(fd);
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crtc_id = res->crtcs[0];
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conn_id = res->connectors[0];
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conn = drmModeGetConnector(fd, conn_id);
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buf[0].width = conn->modes[0].hdisplay;
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buf[0].height = conn->modes[0].vdisplay;
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buf[1].width = conn->modes[0].hdisplay;
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buf[1].height = conn->modes[0].vdisplay;
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modeset_create_fb(fd, &buf[0], 0xFF0000);
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modeset_create_fb(fd, &buf[1], 0x0000FF);
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ret = drmModeSetCrtc(fd, crtc_id, buf[0].fb_id,
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0, 0, &conn_id, 1, &conn->modes[0]);
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if (ret) {
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fprintf(stderr, "1. cannot set CRTC for connector %u (%d): %m\n",
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crtc_id, errno);
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}
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getchar();
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int cnt = 10;
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while (cnt--) {
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ret = drmModeSetCrtc(fd, crtc_id, buf[cnt%2].fb_id,
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0, 0, &conn_id, 1, &conn->modes[0]);
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if (ret) {
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fprintf(stderr, "2. cannot set CRTC for connector %u (%d): %m\n",
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crtc_id, errno);
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}
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usleep(500 * 1000);
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}
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getchar();
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modeset_destroy_fb(fd, &buf[1]);
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modeset_destroy_fb(fd, &buf[0]);
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drmModeFreeConnector(conn);
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drmModeFreeResources(res);
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close(fd);
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return 0;
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}
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