From bf06f27a0e5ce660edce91ecb79c160be646b040 Mon Sep 17 00:00:00 2001
From: fincs <fincs@devkitpro.org>
Date: Wed, 31 Mar 2021 14:49:07 +0200
Subject: [PATCH] Add gspIsPresentPending

---
 libctru/include/3ds/services/gspgpu.h | 6 ++++++
 libctru/source/services/gspgpu.c      | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/libctru/include/3ds/services/gspgpu.h b/libctru/include/3ds/services/gspgpu.h
index 95805a5..5f377b9 100644
--- a/libctru/include/3ds/services/gspgpu.h
+++ b/libctru/include/3ds/services/gspgpu.h
@@ -104,6 +104,12 @@ bool gspHasGpuRight(void);
  */
 void gspPresentBuffer(unsigned screen, unsigned swap, const void* fb_a, const void* fb_b, u32 stride, u32 mode);
 
+/**
+ * @brief Returns true if a prior \ref gspPresentBuffer command is still pending to be processed by GSP.
+ * @param screen Screen ID (see \ref GSP_SCREEN_TOP and \ref GSP_SCREEN_BOTTOM)
+ */
+bool gspIsPresentPending(unsigned screen);
+
 /**
  * @brief Configures a callback to run when a GSPGPU event occurs.
  * @param id ID of the event.
diff --git a/libctru/source/services/gspgpu.c b/libctru/source/services/gspgpu.c
index f2b6d2f..44ce39d 100644
--- a/libctru/source/services/gspgpu.c
+++ b/libctru/source/services/gspgpu.c
@@ -257,6 +257,12 @@ void gspPresentBuffer(unsigned screen, unsigned swap, const void* fb_a, const vo
 	} while (__strex(fbInfoHeader, u.header));
 }
 
+bool gspIsPresentPending(unsigned screen)
+{
+	s32* fbInfoHeader = (s32*)((u8*)gspSharedMem + 0x200 + gspThreadId*0x80 + screen*0x40);
+	return (*fbInfoHeader & 0xff00) != 0;
+}
+
 void gspSetEventCallback(GSPGPU_Event id, ThreadFunc cb, void* data, bool oneShot)
 {
 	if(id>= GSPGPU_EVENT_MAX)return;