From bc0da95808ccc8b107e1ba448a65bff611ed6138 Mon Sep 17 00:00:00 2001
From: Persune <gumball2415@gmail.com>
Date: Mon, 11 Dec 2023 15:51:42 +0800
Subject: [PATCH] Fix RGB PPU default palette emphasis behavior

---
 Core/NES/NesDefaultVideoFilter.cpp | 50 +++++++++++++++++++-----------
 Core/NES/NesDefaultVideoFilter.h   |  2 +-
 2 files changed, 33 insertions(+), 19 deletions(-)

diff --git a/Core/NES/NesDefaultVideoFilter.cpp b/Core/NES/NesDefaultVideoFilter.cpp
index 229997986..3924a66ba 100644
--- a/Core/NES/NesDefaultVideoFilter.cpp
+++ b/Core/NES/NesDefaultVideoFilter.cpp
@@ -42,31 +42,45 @@ NesDefaultVideoFilter::NesDefaultVideoFilter(Emulator* emu) : BaseVideoFilter(em
 	InitLookupTable();
 }
 
-void NesDefaultVideoFilter::GenerateFullColorPalette(uint32_t paletteBuffer[512])
+void NesDefaultVideoFilter::GenerateFullColorPalette(uint32_t paletteBuffer[512], PpuModel model)
 {
 	for(int i = 0; i < 64; i++) {
 		for(int j = 1; j < 8; j++) {
 			double redColor = (uint8_t)(paletteBuffer[i] >> 16);
 			double greenColor = (uint8_t)(paletteBuffer[i] >> 8);
 			double blueColor = (uint8_t)paletteBuffer[i];
-			if((i & 0x0F) <= 0x0D) {
-				//Emphasis doesn't affect columns $xE and $xF
-				if(j & 0x01) {
-					//Intensify red
-					greenColor *= 0.84;
-					blueColor *= 0.84;
-				}
-				if(j & 0x02) {
-					//Intensify green
-					redColor *= 0.84;
-					blueColor *= 0.84;
-				}
-				if(j & 0x04) {
-					//Intensify blue
-					redColor *= 0.84;
-					greenColor *= 0.84;
+			if(model == PpuModel::Ppu2C02) {
+				if((i & 0x0F) <= 0x0D) {
+					//Emphasis doesn't affect columns $xE and $xF
+					if(j & 0x01) {
+						//Intensify red
+						greenColor *= 0.84;
+						blueColor *= 0.84;
+					}
+					if(j & 0x02) {
+						//Intensify green
+						redColor *= 0.84;
+						blueColor *= 0.84;
+					}
+					if(j & 0x04) {
+						//Intensify blue
+						redColor *= 0.84;
+						greenColor *= 0.84;
+					}
 				}
 			}
+			else {
+				// RGB PPUs do emphasis in a different way
+				//Intensify red
+				if(j & 0x01)
+					redColor = 0xFF;
+				//Intensify green
+				if(j & 0x02)
+					greenColor = 0xFF;
+				//Intensify blue
+				if(j & 0x04)
+					blueColor = 0xFF;
+			}
 
 			uint8_t r = (uint8_t)(redColor > 255 ? 255 : redColor);
 			uint8_t g = (uint8_t)(greenColor > 255 ? 255 : greenColor);
@@ -98,7 +112,7 @@ void NesDefaultVideoFilter::GetFullPalette(uint32_t palette[512], NesConfig& nes
 			}
 		} else {
 			memcpy(palette, _ppuPaletteArgb[(int)model], sizeof(_ppuPaletteArgb[(int)_ppuModel]));
-			GenerateFullColorPalette(palette);
+			GenerateFullColorPalette(palette, model);
 		}
 	}
 }
diff --git a/Core/NES/NesDefaultVideoFilter.h b/Core/NES/NesDefaultVideoFilter.h
index f5b083e81..36b6074e3 100644
--- a/Core/NES/NesDefaultVideoFilter.h
+++ b/Core/NES/NesDefaultVideoFilter.h
@@ -25,7 +25,7 @@ class NesDefaultVideoFilter : public BaseVideoFilter
 
 	static void ApplyPalBorder(uint16_t* ppuOutputBuffer);
 
-	static void GenerateFullColorPalette(uint32_t paletteBuffer[512]);
+	static void GenerateFullColorPalette(uint32_t paletteBuffer[512], PpuModel model = PpuModel::Ppu2C02);
 	static void GetFullPalette(uint32_t palette[512], NesConfig& nesCfg, PpuModel model);
 
 	static uint32_t GetDefaultPixelBrightness(uint16_t colorIndex, PpuModel model);