Handle coordinates in opposite order

1 files changed, 14 insertions, 4 deletions

diff --git a/harddoomdev.c b/harddoomdev.c
index 30c37fe..fc1f0e4 100644
--- a/harddoomdev.c
+++ b/harddoomdev.c
@@ -232,11 +232,16 @@ void draw_column(struct surface_data *surface_data,
 		struct colors_data *colors_data, struct colors_data *trans_data,
 		uint8_t flags, uint8_t trans_idx)
 {
+	uint16_t y1, y2;
+
+	y1 = min(column.y1, column.y2);
+	y2 = max(column.y1, column.y2);
+
 	set_surf_dst_pt(surface_data->doom_data, surface_data->page_table_dev);
 	set_surf_dims(surface_data->doom_data, surface_data->width, surface_data->height);
 	set_draw_params(surface_data->doom_data, flags);
-	set_xy_a(surface_data->doom_data, column.x, column.y1);
-	set_xy_b(surface_data->doom_data, column.x, column.y2);
+	set_xy_a(surface_data->doom_data, column.x, y1);
+	set_xy_b(surface_data->doom_data, column.x, y2);
 
 	if (!(flags & HARDDOOM_DRAW_PARAMS_FUZZ)) {
 		set_texture_pt(surface_data->doom_data,
@@ -265,12 +270,17 @@ void draw_column(struct surface_data *surface_data,
 void draw_span(struct surface_data *surface_data, struct flat_data *flat_data,
 		struct doomdev_span span)
 {
+	uint16_t x1, x2;
+
+	x1 = min(span.x1, span.x2);
+	x2 = max(span.x1, span.x2);
+
 	set_surf_dst_pt(surface_data->doom_data, surface_data->page_table_dev);
 	set_surf_dims(surface_data->doom_data, surface_data->width,
 			surface_data->height);
 	set_flat(surface_data->doom_data, flat_data->flat_dev);
-	set_xy_a(surface_data->doom_data, span.x1, span.y);
-	set_xy_b(surface_data->doom_data, span.x2, span.y);
+	set_xy_a(surface_data->doom_data, x1, span.y);
+	set_xy_b(surface_data->doom_data, x2, span.y);
 	set_ustart(surface_data->doom_data, span.ustart);
 	set_ustep(surface_data->doom_data, span.ustep);
 	set_vstart(surface_data->doom_data, span.vstart);