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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdint.h>
#include <i915_drm.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/fb.h>
#include "wayland.h"
struct lame_compositor {
struct wl_compositor base;
void *fb;
int32_t width, height, stride;
int gem_fd;
};
struct surface_data {
uint32_t handle;
int32_t width, height, stride;
};
void notify_surface_create(struct wl_compositor *compositor,
struct wl_surface *surface)
{
struct surface_data *sd;
sd = malloc(sizeof *sd);
if (sd == NULL)
return;
sd->handle = 0;
wl_surface_set_data(surface, sd);
}
void notify_surface_destroy(struct wl_compositor *compositor,
struct wl_surface *surface)
{
struct lame_compositor *lc = (struct lame_compositor *) compositor;
struct surface_data *sd;
struct drm_gem_close close_arg;
int ret;
sd = wl_surface_get_data(surface);
if (sd == NULL || sd->handle == 0)
return;
close_arg.handle = sd->handle;
ret = ioctl(lc->gem_fd, DRM_IOCTL_GEM_CLOSE, &close_arg);
if (ret != 0) {
fprintf(stderr, "failed to gem_close handle %d: %m\n", sd->handle);
}
free(sd);
}
void notify_surface_attach(struct wl_compositor *compositor,
struct wl_surface *surface, uint32_t name,
uint32_t width, uint32_t height, uint32_t stride)
{
struct lame_compositor *lc = (struct lame_compositor *) compositor;
struct surface_data *sd;
struct drm_gem_open open_arg;
struct drm_gem_close close_arg;
int ret;
sd = wl_surface_get_data(surface);
if (sd == NULL)
return;
if (sd->handle != 0) {
close_arg.handle = sd->handle;
ret = ioctl(lc->gem_fd, DRM_IOCTL_GEM_CLOSE, &close_arg);
if (ret != 0) {
fprintf(stderr, "failed to gem_close name %d: %m\n", name);
}
}
open_arg.name = name;
ret = ioctl(lc->gem_fd, DRM_IOCTL_GEM_OPEN, &open_arg);
if (ret != 0) {
fprintf(stderr, "failed to gem_open name %d, fd=%d: %m\n", name, lc->gem_fd);
return;
}
sd->handle = open_arg.handle;
sd->width = width;
sd->height = height;
sd->stride = stride;
}
void notify_surface_map(struct wl_compositor *compositor,
struct wl_surface *surface, struct wl_map *map)
{
struct lame_compositor *lc = (struct lame_compositor *) compositor;
struct surface_data *sd;
struct drm_i915_gem_pread pread;
char *data, *dst;
uint32_t size;
int i;
/* This part is where we actually copy the buffer to screen.
* Needs to be part of the repaint loop, not in the notify_map
* handler. */
sd = wl_surface_get_data(surface);
if (sd == NULL)
return;
size = sd->height * sd->stride;
data = malloc(size);
if (data == NULL) {
fprintf(stderr, "swap buffers malloc failed\n");
return;
}
pread.handle = sd->handle;
pread.pad = 0;
pread.offset = 0;
pread.size = size;
pread.data_ptr = (long) data;
if (ioctl(lc->gem_fd, DRM_IOCTL_I915_GEM_PREAD, &pread)) {
fprintf(stderr, "gem pread failed");
return;
}
dst = lc->fb + lc->stride * map->y + map->x * 4;
for (i = 0; i < sd->height; i++)
memcpy(dst + lc->stride * i, data + sd->stride * i, sd->width * 4);
free(data);
}
struct wl_compositor_interface interface = {
notify_surface_create,
notify_surface_destroy,
notify_surface_attach,
notify_surface_map
};
static const char fb_device[] = "/dev/fb";
static const char gem_device[] = "/dev/dri/card0";
struct wl_compositor *
wl_compositor_create(void)
{
struct lame_compositor *lc;
struct fb_fix_screeninfo fix;
struct fb_var_screeninfo var;
int fd;
lc = malloc(sizeof *lc);
if (lc == NULL)
return NULL;
lc->base.interface = &interface;
fd = open(fb_device, O_RDWR);
if (fd < 0) {
fprintf(stderr, "open %s failed: %m\n", fb_device);
return NULL;
}
if (ioctl(fd, FBIOGET_FSCREENINFO, &fix) < 0) {
fprintf(stderr, "fb get fixed failed\n");
return NULL;
}
if (ioctl(fd, FBIOGET_VSCREENINFO, &var) < 0) {
fprintf(stderr, "fb get fixed failed\n");
return NULL;
}
lc->stride = fix.line_length;
lc->width = var.xres;
lc->height = var.yres;
lc->fb = mmap(NULL, lc->stride * lc->height,
PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
close(fd);
if (lc->fb == MAP_FAILED) {
fprintf(stderr, "fb map failed\n");
return NULL;
}
lc->gem_fd = open(gem_device, O_RDWR);
if (lc->gem_fd < 0) {
fprintf(stderr, "failed to open drm device\n");
return NULL;
}
return &lc->base;
}
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