#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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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[3];
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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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};
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struct drm_mode_map_dumb map = {
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};
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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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drmModeAddFB(fd, bo->width, bo->height, 24, 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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};
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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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char *dri_card="/dev/dri/card0";
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int fd;
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uint32_t conn_id;
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uint32_t crtc_id;
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drmModeConnector *conn;
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drmModeRes *res;
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if( argc != 2 )
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{
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printf("Usage: %s /dev/dri/card0\n", argv[0]);
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return 1;
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}
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else
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{
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dri_card = argv[1];
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}
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fd = open(dri_card, O_RDWR | O_CLOEXEC);
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if( fd < 0)
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{
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printf("Open '%s' failure: %s\n", dri_card, strerror(errno));
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return 0;
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}
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res = drmModeGetResources(fd);
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if( !res )
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{
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printf("drmModeGetResources() failure\n");
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return 0;
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}
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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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if( !conn )
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{
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printf("drmModeGetConnector() failure\n");
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return 0;
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}
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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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buf[2].width = conn->modes[0].hdisplay;
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buf[2].height = conn->modes[0].vdisplay;
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printf("DRM create framebuffer now.\n");
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modeset_create_fb(fd, &buf[0], 0xff0000);
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modeset_create_fb(fd, &buf[1], 0x00ff00);
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modeset_create_fb(fd, &buf[2], 0x0000ff);
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printf("Show red screen on LCD.\n");
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drmModeSetCrtc(fd, crtc_id, buf[0].fb_id, 0, 0, &conn_id, 1, &conn->modes[0]);
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getchar();
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printf("Show green screen on LCD.\n");
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drmModeSetCrtc(fd, crtc_id, buf[1].fb_id, 0, 0, &conn_id, 1, &conn->modes[0]);
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getchar();
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printf("Show blue screen on LCD.\n");
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drmModeSetCrtc(fd, crtc_id, buf[2].fb_id, 0, 0, &conn_id, 1, &conn->modes[0]);
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getchar();
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printf("DRM destroy framebuffer now.\n");
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modeset_destroy_fb(fd, &buf[0]);
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modeset_destroy_fb(fd, &buf[1]);
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modeset_destroy_fb(fd, &buf[2]);
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drmModeFreeConnector(conn);
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return 0;
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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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