Fix hang up when MODESET2_IE0 is disabledHEADmaster

1 files changed, 6 insertions, 1 deletions

diff --git a/vdp.hpp b/vdp.hpp
index 1b67625..f62345d 100644
--- a/vdp.hpp
+++ b/vdp.hpp
@@ -51,7 +51,12 @@ public:
     constexpr VDP(const uint32_t base_address_a): base_address(base_address_a) {}
     uint32_t Read(uint32_t offset, enum bitness);
     void Write(uint32_t offset, enum bitness, uint32_t value);
-    bool Scanline(); // Returns true if display disabled or vblank happened
+    /** Renders a horizontal line (scan line).
+     *
+     * Returns true if display disabled or VBLANK could've had happened, even if
+     * VBLANK is disabled (MODESET2_IE0 is 0).
+     * */
+    bool Scanline();
     void Reset();
     constexpr const uint32_t* GetRenderedBuffer() const { return _rendered_buffer; }
     static const char* RegIDToString(RegID);