split out legacy (pageflip) kms

Preping to add new atomic alternative path.

1 files changed, 124 insertions, 0 deletions

diff --git a/drm-legacy.c b/drm-legacy.c
new file mode 100644
index 0000000..29d5f3c
--- /dev/null
+++ b/drm-legacy.c
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2017 Rob Clark <rclark@redhat.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sub license,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "common.h"
+#include "drm.h"
+
+static struct drm drm;
+
+static void page_flip_handler(int fd, unsigned int frame,
+		  unsigned int sec, unsigned int usec, void *data)
+{
+	int *waiting_for_flip = data;
+	*waiting_for_flip = 0;
+}
+
+static int legacy_run(const struct gbm *gbm, const struct egl *egl)
+{
+	fd_set fds;
+	drmEventContext evctx = {
+			.version = DRM_EVENT_CONTEXT_VERSION,
+			.page_flip_handler = page_flip_handler,
+	};
+	struct gbm_bo *bo;
+	struct drm_fb *fb;
+	uint32_t i = 0;
+	int ret;
+
+	FD_ZERO(&fds);
+	FD_SET(0, &fds);
+	FD_SET(drm.fd, &fds);
+
+	eglSwapBuffers(egl->display, egl->surface);
+	bo = gbm_surface_lock_front_buffer(gbm->surface);
+	fb = drm_fb_get_from_bo(bo);
+
+	/* set mode: */
+	ret = drmModeSetCrtc(drm.fd, drm.crtc_id, fb->fb_id, 0, 0,
+			&drm.connector_id, 1, drm.mode);
+	if (ret) {
+		printf("failed to set mode: %s\n", strerror(errno));
+		return ret;
+	}
+
+	while (1) {
+		struct gbm_bo *next_bo;
+		int waiting_for_flip = 1;
+
+		egl->draw(i++);
+
+		eglSwapBuffers(egl->display, egl->surface);
+		next_bo = gbm_surface_lock_front_buffer(gbm->surface);
+		fb = drm_fb_get_from_bo(next_bo);
+
+		/*
+		 * Here you could also update drm plane layers if you want
+		 * hw composition
+		 */
+
+		ret = drmModePageFlip(drm.fd, drm.crtc_id, fb->fb_id,
+				DRM_MODE_PAGE_FLIP_EVENT, &waiting_for_flip);
+		if (ret) {
+			printf("failed to queue page flip: %s\n", strerror(errno));
+			return -1;
+		}
+
+		while (waiting_for_flip) {
+			ret = select(drm.fd + 1, &fds, NULL, NULL, NULL);
+			if (ret < 0) {
+				printf("select err: %s\n", strerror(errno));
+				return ret;
+			} else if (ret == 0) {
+				printf("select timeout!\n");
+				return -1;
+			} else if (FD_ISSET(0, &fds)) {
+				printf("user interrupted!\n");
+				break;
+			}
+			drmHandleEvent(drm.fd, &evctx);
+		}
+
+		/* release last buffer to render on again: */
+		gbm_surface_release_buffer(gbm->surface, bo);
+		bo = next_bo;
+	}
+
+	return 0;
+}
+
+const struct drm * init_drm_legacy(const char *device)
+{
+	int ret;
+
+	ret = init_drm(&drm, device);
+	if (ret)
+		return NULL;
+
+	drm.run = legacy_run;
+
+	return &drm;
+}