Implement blue light filters in rosalina

sysmodules/rosalina/include/menus/screen_filters.h

@@ -0,0 +1,37 @@
+/*
+*   This file is part of Luma3DS
+*   Copyright (C) 2016-2017 Aurora Wright, TuxSH
+*
+*   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/>.
+*
+*   Additional Terms 7.b and 7.c of GPLv3 apply to this file:
+*       * Requiring preservation of specified reasonable legal notices or
+*         author attributions in that material or in the Appropriate Legal
+*         Notices displayed by works containing it.
+*       * Prohibiting misrepresentation of the origin of that material,
+*         or requiring that modified versions of such material be marked in
+*         reasonable ways as different from the original version.
+*/
+
+#pragma once
+
+extern Menu screenFiltersMenu;
+
+void screenFiltersSetDisabled(void);
+void screenFiltersReduceBlueLevel1(void);
+void screenFiltersReduceBlueLevel2(void);
+void screenFiltersReduceBlueLevel3(void);
+void screenFiltersReduceBlueLevel4(void);
+void screenFiltersReduceBlueLevel5(void);
+void screenFiltersSetTemperature(int temperature);

sysmodules/rosalina/source/menus.c

@@ -35,19 +35,21 @@
 #include "menus/debugger.h"
 #include "menus/miscellaneous.h"
 #include "menus/sysconfig.h"
+#include "menus/screen_filters.h"
 #include "ifile.h"
 #include "memory.h"
 #include "fmt.h"
 
 Menu rosalinaMenu = {
     "Rosalina menu",
-    .nbItems = 9,
+    .nbItems = 10,
     {
         { "Process list", METHOD, .method = &RosalinaMenu_ProcessList },
         { "Take screenshot (slow!)", METHOD, .method = &RosalinaMenu_TakeScreenshot },
         { "New 3DS menu...", MENU, .menu = &N3DSMenu },
         { "Debugger options...", MENU, .menu = &debuggerMenu },
         { "System configuration...", MENU, .menu = &sysconfigMenu },
+        { "Screen filters...", MENU, .menu = &screenFiltersMenu },
         { "Miscellaneous options...", MENU, .menu = &miscellaneousMenu },
         { "Power off", METHOD, .method = &RosalinaMenu_PowerOff },
         { "Reboot", METHOD, .method = &RosalinaMenu_Reboot },

sysmodules/rosalina/source/menus/screen_filters.c

@@ -0,0 +1,144 @@
+/*
+*   This file is part of Luma3DS
+*   Copyright (C) 2017-2018 Sono (https://github.com/MarcuzD), panicbit
+*
+*   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/>.
+*
+*   Additional Terms 7.b and 7.c of GPLv3 apply to this file:
+*       * Requiring preservation of specified reasonable legal notices or
+*         author attributions in that material or in the Appropriate Legal
+*         Notices displayed by works containing it.
+*       * Prohibiting misrepresentation of the origin of that material,
+*         or requiring that modified versions of such material be marked in
+*         reasonable ways as different from the original version.
+*/
+
+#include <3ds.h>
+#include "memory.h"
+#include "menu.h"
+#include "menus/screen_filters.h"
+#include "draw.h"
+#include "redshift/redshift.h"
+#include "redshift/colorramp.h"
+
+#define TEMP_DEFAULT NEUTRAL_TEMP
+
+void writeLut(u32* lut)
+{
+    u8 idx = 0;
+    do {
+        u32 pos = idx & 0xFF;
+
+        GPU_FB_TOP_COL_LUT_INDEX = pos;
+        GPU_FB_TOP_COL_LUT_ELEM = *lut;
+        GPU_FB_BOTTOM_COL_LUT_INDEX = pos;
+        GPU_FB_BOTTOM_COL_LUT_ELEM = *lut;
+
+        lut++;
+    } while(++idx);
+}
+
+typedef struct {
+    u8 r;
+    u8 g;
+    u8 b;
+    u8 z;
+} Pixel;
+
+void applyColorSettings(color_setting_t* cs)
+{
+    u16 c[0x600];
+    Pixel px[0x400];
+    u8 i = 0;
+
+    memset(c, 0, 0x600);
+    memset(px, 0, 0x400 * sizeof(Pixel));
+
+    do {
+        *(u32*)&px[i] = i | (i << 8) | (i << 16);
+    } while(++i);
+
+    do {
+        *(c + i + 0x000) = px[i].r | (px[i].r << 8);
+        *(c + i + 0x100) = px[i].g | (px[i].g << 8);
+        *(c + i + 0x200) = px[i].b | (px[i].b << 8);
+    } while(++i);
+
+    colorramp_fill(c + 0x000, c + 0x100, c + 0x200, 0x100, cs);
+
+    do {
+        px[i].r = *(c + i + 0x000) >> 8;
+        px[i].g = *(c + i + 0x100) >> 8;
+        px[i].b = *(c + i + 0x200) >> 8;
+    } while(++i);
+
+    writeLut((u32*)px);
+}
+
+Menu screenFiltersMenu = {
+    "Screen filters menu",
+    .nbItems = 6,
+    {
+        { "Disable", METHOD, .method = &screenFiltersSetDisabled },
+        { "Reduce blue light (level 1)", METHOD, .method = &screenFiltersReduceBlueLevel1 },
+        { "Reduce blue light (level 2)", METHOD, .method = &screenFiltersReduceBlueLevel2 },
+        { "Reduce blue light (level 3)", METHOD, .method = &screenFiltersReduceBlueLevel3 },
+        { "Reduce blue light (level 4)", METHOD, .method = &screenFiltersReduceBlueLevel4 },
+        { "Reduce blue light (level 5)", METHOD, .method = &screenFiltersReduceBlueLevel5 },
+    }
+};
+
+void screenFiltersSetDisabled(void)
+{
+    screenFiltersSetTemperature(TEMP_DEFAULT);
+}
+
+void screenFiltersReduceBlueLevel1(void)
+{
+    screenFiltersSetTemperature(4300);
+}
+
+void screenFiltersReduceBlueLevel2(void)
+{
+    screenFiltersSetTemperature(3200);
+}
+
+void screenFiltersReduceBlueLevel3(void)
+{
+    screenFiltersSetTemperature(2100);
+}
+
+void screenFiltersReduceBlueLevel4(void)
+{
+    screenFiltersSetTemperature(1550);
+}
+
+void screenFiltersReduceBlueLevel5(void)
+{
+    screenFiltersSetTemperature(1000);
+}
+
+void screenFiltersSetTemperature(int temperature)
+{
+    color_setting_t cs;
+    memset(&cs, 0, sizeof(cs));
+
+    cs.temperature = temperature;
+    cs.gamma[0] = 1.0F;
+    cs.gamma[1] = 1.0F;
+    cs.gamma[2] = 1.0F;
+    cs.brightness = 1.0F;
+
+    applyColorSettings(&cs);
+}