From e1d57f01b2112a6415313c83fc300f94475db382 Mon Sep 17 00:00:00 2001
From: Marcin Chrzanowski <marcin.j.chrzanowski@gmail.com>
Date: Sun, 27 May 2018 14:45:16 +0200
Subject: Implement draw background

---
 harddoomdev.c |  9 +++++++++
 harddoomdev.h |  2 ++
 surface.c     | 31 +++++++++++++++++++++++++++++++
 3 files changed, 42 insertions(+)

diff --git a/harddoomdev.c b/harddoomdev.c
index 1a818ea..c4489aa 100644
--- a/harddoomdev.c
+++ b/harddoomdev.c
@@ -245,6 +245,15 @@ void draw_span(struct surface_data *surface_data, struct flat_data *flat_data,
 	send_command(surface_data->doom_data, HARDDOOM_CMD_DRAW_SPAN);
 }
 
+void draw_background(struct surface_data *surface_data,
+		struct flat_data *flat_data)
+{
+	set_surf_dst_pt(surface_data->doom_data, surface_data->page_table_dev);
+	set_flat(surface_data->doom_data, flat_data->flat_dev);
+
+	send_command(surface_data->doom_data, HARDDOOM_CMD_DRAW_BACKGROUND);
+}
+
 uint32_t doomdev_read_stat(void __iomem *iomem, size_t stat)
 {
 	return doomdev_read(iomem, HARDDOOM_STATS(stat));
diff --git a/harddoomdev.h b/harddoomdev.h
index 9381fd5..4ddd01e 100644
--- a/harddoomdev.h
+++ b/harddoomdev.h
@@ -23,5 +23,7 @@ void draw_column(struct surface_data *surface_data,
 		struct texture_data *texture_data, struct doomdev_column column);
 void draw_span(struct surface_data *surface_data, struct flat_data *flat_data,
 		struct doomdev_span span);
+void draw_background(struct surface_data *surface_data,
+		struct flat_data *flat_data);
 
 #endif
diff --git a/surface.c b/surface.c
index 29530b7..fddc0fe 100644
--- a/surface.c
+++ b/surface.c
@@ -163,6 +163,35 @@ long draw_spans(struct file *filp, unsigned long arg)
 	return param->spans_num;
 }
 
+long do_draw_background(struct file *filp, unsigned long arg)
+{
+	struct doomdev_surf_ioctl_draw_background *param;
+	struct surface_data *surface_data;
+	struct flat_data *flat_data;
+	struct fd flat_fds;
+
+	surface_data = filp->private_data;
+
+	param = (struct doomdev_surf_ioctl_draw_background *) arg;
+
+	flat_fds = fdget(param->flat_fd);
+	flat_data = flat_fds.file->private_data;
+
+	if (surface_data->doom_data != flat_data->doom_data) {
+		return -EINVAL;
+	}
+
+	mutex_lock(&surface_data->doom_data->cmd_mutex);
+
+	draw_background(surface_data, flat_data);
+
+	mutex_unlock(&surface_data->doom_data->cmd_mutex);
+
+	fdput(flat_fds);
+
+	return 0;
+}
+
 long surface_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
 	switch (cmd) {
@@ -176,6 +205,8 @@ long surface_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 		return draw_columns(filp, arg);
 	case DOOMDEV_SURF_IOCTL_DRAW_SPANS:
 		return draw_spans(filp, arg);
+	case DOOMDEV_SURF_IOCTL_DRAW_BACKGROUND:
+		return do_draw_background(filp, arg);
 	default:
 		return -1;
 	}
-- 
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