From bcda8cccaf51be21ac7ee7bcd2712f5c3474c870 Mon Sep 17 00:00:00 2001
From: Denis Pauk <pauk.denis@gmail.com>
Date: Sat, 22 Jun 2024 23:34:26 +0300
Subject: [PATCH] vid: cache colormap

---
 src/client/vid/header/vid.h |  2 ++
 src/client/vid/image.c      | 51 ++++++++++++++++++++++++++++++++-----
 src/client/vid/vid.c        |  5 ++++
 3 files changed, 51 insertions(+), 7 deletions(-)

diff --git a/src/client/vid/header/vid.h b/src/client/vid/header/vid.h
index a176ae86..d1343b42 100644
--- a/src/client/vid/header/vid.h
+++ b/src/client/vid/header/vid.h
@@ -48,6 +48,8 @@ qboolean VID_HasRenderer(const char *renderer);
 void	VID_Init(void);
 void	VID_Shutdown(void);
 void	VID_CheckChanges(void);
+void	VID_ImageInit(void);
+void	VID_ImageDestroy(void);
 
 void	VID_MenuInit(void);
 void	VID_MenuDraw(void);
diff --git a/src/client/vid/image.c b/src/client/vid/image.c
index 0692520e..e0712a80 100644
--- a/src/client/vid/image.c
+++ b/src/client/vid/image.c
@@ -112,6 +112,10 @@ static unsigned char quitscreenfix[] = {
 	1,40,4,4,40,4,29,28,31,45,47,28,47,47,4,40,28,28
 };
 
+static byte *colormap_cache = NULL;
+static unsigned d_8to24table_cache[256];
+
+
 static void
 fixQuitScreen(byte* px)
 {
@@ -353,13 +357,8 @@ GenerateColormap(const byte *palette, byte *out_colormap)
 	}
 }
 
-/*
-===============
-VID_GetPalette
-===============
-*/
-void
-VID_GetPalette(byte **colormap, unsigned *d_8to24table)
+static void
+LoadPalette(byte **colormap, unsigned *d_8to24table)
 {
 	const char * filename;
 	int bytesPerPixel;
@@ -470,6 +469,44 @@ VID_GetPalette(byte **colormap, unsigned *d_8to24table)
 	}
 }
 
+/*
+===============
+VID_GetPalette
+===============
+*/
+void
+VID_GetPalette(byte **colormap, unsigned *d_8to24table)
+{
+	if (!colormap_cache)
+	{
+		LoadPalette(&colormap_cache, d_8to24table_cache);
+	}
+
+	if (!colormap_cache)
+	{
+		return;
+	}
+
+	*colormap = malloc(256 * 320);
+	memcpy(*colormap, colormap_cache, 256 * 320);
+	memcpy(d_8to24table, d_8to24table_cache, sizeof(d_8to24table_cache));
+}
+
+void
+VID_ImageInit(void)
+{
+	colormap_cache = NULL;
+}
+
+void
+VID_ImageDestroy(void)
+{
+	if (colormap_cache)
+	{
+		free(colormap_cache);
+	}
+}
+
 void
 VID_GetPalette24to8(const byte *d_8to24table, byte** d_16to8table)
 {
diff --git a/src/client/vid/vid.c b/src/client/vid/vid.c
index eec94a38..09705fde 100644
--- a/src/client/vid/vid.c
+++ b/src/client/vid/vid.c
@@ -602,6 +602,8 @@ VID_Init(void)
 		Com_Error(ERR_FATAL, "Couldn't initialize the graphics subsystem!\n");
 	}
 
+	VID_ImageInit();
+
 	// Load the renderer and get things going.
 	VID_CheckChanges();
 }
@@ -613,6 +615,9 @@ void
 VID_Shutdown(void)
 {
 	VID_ShutdownRenderer();
+
+	VID_ImageDestroy();
+
 	GLimp_Shutdown();
 }