Added experimental support for true color correction to mimic the look of the crappy GBA LCD. Thanks to hunterk and Pokefan531 for their work on the libretro shaders this is based on.

Author: profi200

README.md

@@ -79,6 +79,9 @@ Video-related settings.
 `float brightness` - Screen lift
 * Default: `0.0`
 
+`string colorProfile` - Color correction profile. `none`, `gba`, `nds` or `nds_white`.
+* Default: `none`
+
 ### Audio
 Audio settings.
 
@@ -255,8 +258,9 @@ You may use this under the terms of the GNU General Public License GPL v3 or the
 * **MAME**
 * **No-Intro**
 * **Wolfvak, Sono and all the other people in #GodMode9 on freenode/Discord**
-* **endrift, Extrems and all the other people in #mgba on freenode**
+* **endrift, Extrems and all the other people in #mgba on Libera.Chat**
 * **Oleh Prypin (oprypin) for nightly.link**
+* **hunterk and Pokefan531 for their amazing libretro shaders**
 * ...everyone who contributed to **3dbrew.org**
 
-Copyright (C) 2021 derrek, profi200, d0k3
+Copyright (C) 2024 derrek, profi200, d0k3

include/arm11/config.h

@@ -46,6 +46,7 @@ typedef struct
 	float lcdGamma;
 	float contrast;
 	float brightness;
+	u8 colorProfile;    // 0 = none, 1 = GBA, 2 = DS phat, 3 = DS phat white.
 
 	// [audio]
 	u8 audioOut;        // 0 = auto, 1 = speakers, 2 = headphones.

include/arm11/fast_frame_convert.h

@@ -0,0 +1,33 @@
+#pragma once
+
+/*
+ *   This file is part of open_agb_firm
+ *   Copyright (C) 2024 profi200
+ *
+ *   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
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+void convert160pFrameFast(void);
+void convert240pFrameFast(void);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif

include/arm11/gpu_cmd_lists.h

@@ -27,6 +27,8 @@ extern "C"
 #endif
 
 #define GPU_RENDER_BUF_ADDR  (0x18180000)
+#define GPU_TEXTURE_ADDR     (0x18200000)
+#define GPU_TEXTURE2_ADDR    (0x18300000)
 #define GBA_INIT_LIST_SIZE   (1136)
 #define GBA_LIST2_SIZE       (448)
 
@@ -36,7 +38,7 @@ extern u8 gbaGpuList2[GBA_LIST2_SIZE];
 
 
 
-void patchGbaGpuCmdList(u8 scaleType);
+void patchGbaGpuCmdList(const u8 scaleType, const bool useSecondTexture);
 
 #ifdef __cplusplus
 } // extern "C"

libraries/libn3ds

@@ -36,7 +36,8 @@
                         "gbaGamma=2.2\n"          \
                         "lcdGamma=1.54\n"         \
                         "contrast=1.0\n"          \
-                        "brightness=0.0\n\n"      \
+                        "brightness=0.0\n"        \
+                        "colorProfile=none\n\n"   \
                         "[audio]\n"               \
                         "audioOut=0\n"            \
                         "volume=127\n\n"          \
@@ -61,6 +62,7 @@ OafConfig g_oafConfig =
 	1.54f, // lcdGamma
 	1.f,   // contrast
 	0.f,   // brightness
+	0,     // colorProfile
 
 	// [audio]
 	0,     // Automatic audio output.
@@ -154,6 +156,19 @@ static int cfgIniCallback(void* user, const char* section, const char* name, con
 			config->contrast = str2float(value);
 		else if(strcmp(name, "brightness") == 0)
 			config->brightness = str2float(value);
+		else if(strcmp(name, "colorProfile") == 0)
+		{
+			if(strcmp(value, "none") == 0)
+				config->colorProfile = 0;
+			else if(strcmp(value, "gba") == 0)
+				config->colorProfile = 1;
+			else if(strcmp(value, "nds") == 0)
+				config->colorProfile = 2;
+			else if(strcmp(value, "nds_white") == 0)
+				config->colorProfile = 3;
+			//else if(strcmp(value, "custom") == 0) // TODO: Implement user provided profile.
+			//	config->colorProfile = 4;
+		}
 	}
 	else if(strcmp(section, "audio") == 0)
 	{