diff --git a/include/PICA/regs.hpp b/include/PICA/regs.hpp
index 0337cc1f..e1c9a819 100644
--- a/include/PICA/regs.hpp
+++ b/include/PICA/regs.hpp
@@ -10,6 +10,13 @@ namespace PICA {
 			ViewportHeight = 0x43,
 			ViewportInvh = 0x44,
 
+			// Clipping plane control
+			ClipEnable = 0x47,
+			ClipData0 = 0x48,
+			ClipData1 = 0x49,
+			ClipData2 = 0x4A,
+			ClipData3 = 0x4B,
+
 			DepthScale = 0x4D,
 			DepthOffset = 0x4E,
 			ShaderOutputCount = 0x4F,
diff --git a/include/opengl.hpp b/include/opengl.hpp
index 9d93078b..b259381b 100644
--- a/include/opengl.hpp
+++ b/include/opengl.hpp
@@ -1,5 +1,5 @@
 /***************************************************************************
- *   Copyright (C) 2022 PCSX-Redux authors                                 *
+ *   Copyright (C) 2022 PCSX-Redux & Panda3DS authors                      *
  *                                                                         *
  *   This program is free software; you can redistribute it and/or modify  *
  *   it under the terms of the GNU General Public License as published by  *
@@ -524,6 +524,9 @@ namespace OpenGL {
     static void enableStencil() { glEnable(GL_STENCIL_TEST); }
     static void disableStencil() { glDisable(GL_STENCIL_TEST); }
 
+    static void enableClipPlane(GLuint index) { glEnable(GL_CLIP_DISTANCE0 + index); }
+	static void disableClipPlane(GLuint index) { glDisable(GL_CLIP_DISTANCE0 + index); }
+
     static void setDepthFunc(DepthFunc func) { glDepthFunc(static_cast<GLenum>(func)); }
 
     enum Primitives {
diff --git a/src/core/PICA/regs.cpp b/src/core/PICA/regs.cpp
index 7cc097de..a0eb5adc 100644
--- a/src/core/PICA/regs.cpp
+++ b/src/core/PICA/regs.cpp
@@ -26,12 +26,12 @@ void GPU::writeReg(u32 address, u32 value) {
 u32 GPU::readInternalReg(u32 index) {
 	using namespace PICA::InternalRegs;
 
-	if (index > regNum) {
+	if (index > regNum) [[unlikely]] {
 		Helpers::panic("Tried to read invalid GPU register. Index: %X\n", index);
 		return 0;
 	}
 
-	else if (index >= LightingLUTData0 && index <= LightingLUTData7) {
+	else if (index >= LightingLUTData0 && index <= LightingLUTData7) [[unlikely]] {
 		const uint32_t index = regs[LightingLUTIndex];  // Get full LUT index register
 		const uint32_t lutID = getBits<8, 5>(index);    // Get which LUT we're actually writing to
 		uint32_t lutIndex = getBits<0, 8>(index);       // And get the index inside the LUT we're writing to
@@ -53,7 +53,7 @@ u32 GPU::readInternalReg(u32 index) {
 void GPU::writeInternalReg(u32 index, u32 value, u32 mask) {
 	using namespace PICA::InternalRegs;
 
-	if (index > regNum) {
+	if (index > regNum) [[unlikely]] {
 		Helpers::panic("Tried to write to invalid GPU register. Index: %X, value: %08X\n", index, value);
 		return;
 	}