Bunch of new stuff: simple compositor, cairo+gem use in client, events.

compositor.c

@@ -0,0 +1,131 @@
+#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;
+};
+
+void notify_surface_create(struct wl_compositor *compositor,
+			   struct wl_surface *surface)
+{
+}
+				   
+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 drm_i915_gem_pread pread;
+	struct drm_gem_open open_arg;
+	struct drm_gem_close close_arg;
+	char *data, *dst;
+	int i, ret, x = 600, y = 200;
+
+	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;
+	}
+
+	data = malloc(open_arg.size);
+	if (data == NULL) {
+		fprintf(stderr, "swap buffers malloc failed\n");
+		return;
+	}
+
+	pread.size = open_arg.size;
+	pread.handle = open_arg.handle;
+	pread.pad = 0;
+	pread.offset = 0;
+	pread.size = stride * height;
+	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 * y + x * 4;
+	for (i = 0; i < height; i++)
+		memcpy(dst + lc->stride * i, data + stride * i, width * 4);
+
+	close_arg.handle = open_arg.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);
+	}
+
+	free(data);
+}
+
+struct wl_compositor_interface interface = {
+	notify_surface_create,
+	notify_surface_attach
+};
+
+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;
+}