From 8a70759e0a2aec24d69a5db8a16322d7f1858a6e Mon Sep 17 00:00:00 2001
From: lachwright <lachlanwright17@gmail.com>
Date: Thu, 12 Dec 2019 01:27:41 +0800
Subject: [PATCH 1/3] Add TC_DASHMODE color shader

---
 src/hardware/hw_md2.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/src/hardware/hw_md2.c b/src/hardware/hw_md2.c
index 9d9171cea..61afee0ab 100644
--- a/src/hardware/hw_md2.c
+++ b/src/hardware/hw_md2.c
@@ -729,6 +729,39 @@ static void HWR_CreateBlendedTexture(GLPatch_t *gpatch, GLPatch_t *blendgpatch,
 			cur++; image++; blendimage++;
 		}
 	}
+	else if (skinnum == TC_DASHMODE)
+	{
+		while (size--)
+		{
+			if (image->s.alpha == 0 && blendimage->s.alpha == 0)
+			{
+				// Don't bother with blending the pixel if the alpha of the blend pixel is 0
+				cur->rgba = image->rgba;
+			}
+			else
+			{
+				UINT8 ialpha = 255 - blendimage->s.alpha, balpha = blendimage->s.alpha;
+				RGBA_t icolor = *image, bcolor;
+
+				if (blendimage->s.alpha)
+				{
+					bcolor.s.blue = 0;
+					bcolor.s.red = 255;
+					bcolor.s.green = (blendimage->s.red + blendimage->s.green + blendimage->s.blue) / 3;
+				}
+				if (image->s.alpha && image->s.red > image->s.green << 1) // this is pretty arbitrary, but it works well for Metal Sonic
+				{
+					icolor.s.red = image->s.blue;
+					icolor.s.blue = image->s.red;
+				}
+				cur->s.red = (ialpha * icolor.s.red + balpha * bcolor.s.red)/255;
+				cur->s.green = (ialpha * icolor.s.green + balpha * bcolor.s.green)/255;
+				cur->s.blue = (ialpha * icolor.s.blue + balpha * bcolor.s.blue)/255;
+				cur->s.alpha = image->s.alpha;
+			}
+			cur++; image++; blendimage++;
+		}
+	}
 	else
 	{
 		while (size--)

From ea129f701c86f87daa7355e6f031d0633951cdfa Mon Sep 17 00:00:00 2001
From: Jaime Passos <lazymyuutsu@gmail.com>
Date: Wed, 11 Dec 2019 22:45:47 -0300
Subject: [PATCH 2/3] Fix Ploadflat closing the game with "Too many flats in
 level" error message

---
 src/p_setup.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/p_setup.c b/src/p_setup.c
index 3c45509ee..8a927d65a 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -672,7 +672,7 @@ INT32 P_AddLevelFlat(const char *flatname, levelflat_t *levelflat)
 //
 INT32 P_AddLevelFlatRuntime(const char *flatname)
 {
-	return Ploadflat(0, flatname);
+	return Ploadflat(levelflats, flatname);
 }
 
 // help function for $$$.sav checking

From 7f092b884b7eb0a89a5b86b2a832a925bab22d80 Mon Sep 17 00:00:00 2001
From: Jaime Passos <lazymyuutsu@gmail.com>
Date: Thu, 12 Dec 2019 22:32:19 -0300
Subject: [PATCH 3/3] Initialise the variable, obviously

---
 src/hardware/hw_md2.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/hardware/hw_md2.c b/src/hardware/hw_md2.c
index 61afee0ab..fea7f50bd 100644
--- a/src/hardware/hw_md2.c
+++ b/src/hardware/hw_md2.c
@@ -743,6 +743,8 @@ static void HWR_CreateBlendedTexture(GLPatch_t *gpatch, GLPatch_t *blendgpatch,
 				UINT8 ialpha = 255 - blendimage->s.alpha, balpha = blendimage->s.alpha;
 				RGBA_t icolor = *image, bcolor;
 
+				memset(&bcolor, 0x00, sizeof(RGBA_t));
+
 				if (blendimage->s.alpha)
 				{
 					bcolor.s.blue = 0;