From efa5fe5eb71b132f951d92e738deed62fbd67dc4 Mon Sep 17 00:00:00 2001
From: "XTra.KrazzY" <XTra.KrazzY@gmail.com>
Date: Sat, 14 Feb 2009 09:04:40 +0000
Subject: [PATCH] New compact texture type for OGL/D3D: IA4. Thanks for the
 IA4->IA8 unpacker hyperiris! Too bad that D3D supports IA4 natively while OGL
 is a bit buggy (treats LUM4_ALPHA4 as LUM8_ALPHA8).

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2238 8ced0084-cf51-0410-be5f-012b33b47a6e
---
 .../Core/VideoCommon/Src/TextureDecoder.cpp   | 19 ++++++++++---------
 Source/Core/VideoCommon/Src/TextureDecoder.h  |  1 +
 .../Plugin_VideoDX9/Src/D3DTexture.cpp        |  1 +
 .../Plugin_VideoDX9/Src/TextureCache.cpp      |  3 +++
 4 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/Source/Core/VideoCommon/Src/TextureDecoder.cpp b/Source/Core/VideoCommon/Src/TextureDecoder.cpp
index 9c2daa3f8e..252f1843a1 100644
--- a/Source/Core/VideoCommon/Src/TextureDecoder.cpp
+++ b/Source/Core/VideoCommon/Src/TextureDecoder.cpp
@@ -262,15 +262,15 @@ inline void decodebytesC14X2(u32 *dst, const u16 *src, int tlutaddr, int tlutfmt
     }
 }
 
-//inline void decodebytesIA4(u32 *dst, const u8 *src, int numbytes)
-inline void decodebytesIA4(u32 *dst, const u8 *src)
+//inline void decodebytesIA4(u16 *dst, const u8 *src, int numbytes)
+inline void decodebytesIA4(u16 *dst, const u8 *src)
 {
     for (int x = 0; x < 8; x++)
     {
-        int val = src[x];
-        int a = lut4to8[val>>4];
-        int r = lut4to8[val&15];
-        dst[x] = (a<<24) | (r<<16) | (r<<8) | r;
+		const u8 val = src[x];
+        const u8 a = lut4to8[val>>4];
+        const u8 l = lut4to8[val&0xF];
+        dst[x] = (a<<8) | l;
     }
 }
 
@@ -398,11 +398,12 @@ PC_TexFormat TexDecoder_Decode(u8 *dst, const u8 *src, int width, int height, in
         {
             for (int y = 0; y < height; y += 4)
                 for (int x = 0; x < width; x += 8)
-                    for (int iy = 0; iy < 4; iy++, src += 8)
+					for (int iy = 0; iy < 4; iy++, src += 8) {
                         //decodebytesIA4((u32*)dst+(y+iy)*width+x, src, 8);
-                        decodebytesIA4((u32*)dst+(y+iy)*width+x, src);
+                        decodebytesIA4((u16*)dst+(y+iy)*width+x, src);
+					}
         }
-        return PC_TEX_FMT_BGRA32;
+		return PC_TEX_FMT_IA8;
     case GX_TF_IA8:
         {
 			for (int y = 0; y < height; y += 4)
diff --git a/Source/Core/VideoCommon/Src/TextureDecoder.h b/Source/Core/VideoCommon/Src/TextureDecoder.h
index 87f9cdedb3..ff7a3fe568 100644
--- a/Source/Core/VideoCommon/Src/TextureDecoder.h
+++ b/Source/Core/VideoCommon/Src/TextureDecoder.h
@@ -73,6 +73,7 @@ enum PC_TexFormat
 {
 	PC_TEX_FMT_NONE = 0,
 	PC_TEX_FMT_BGRA32,
+	PC_TEX_FMT_IA4,
 	PC_TEX_FMT_I8,
 	PC_TEX_FMT_IA8,
 	PC_TEX_FMT_RGB565,
diff --git a/Source/Plugins/Plugin_VideoDX9/Src/D3DTexture.cpp b/Source/Plugins/Plugin_VideoDX9/Src/D3DTexture.cpp
index 13851a9896..be63f3cff9 100644
--- a/Source/Plugins/Plugin_VideoDX9/Src/D3DTexture.cpp
+++ b/Source/Plugins/Plugin_VideoDX9/Src/D3DTexture.cpp
@@ -54,6 +54,7 @@ LPDIRECT3DTEXTURE9 CreateTexture2D(const u8* buffer, const int width, const int
 	{
 	case D3DFMT_L8:
 	case D3DFMT_A8:
+	case D3DFMT_A4L4:
 	{
 		const u8 *pIn = buffer;
 		for (int y = 0; y < height; y++)
diff --git a/Source/Plugins/Plugin_VideoDX9/Src/TextureCache.cpp b/Source/Plugins/Plugin_VideoDX9/Src/TextureCache.cpp
index 964f9be933..938b68ec4f 100644
--- a/Source/Plugins/Plugin_VideoDX9/Src/TextureCache.cpp
+++ b/Source/Plugins/Plugin_VideoDX9/Src/TextureCache.cpp
@@ -179,6 +179,9 @@ void TextureCache::Load(int stage, u32 address, int width, int height, int forma
 	case PC_TEX_FMT_RGB565:
 		d3d_fmt = D3DFMT_R5G6B5;
 		break;
+	case PC_TEX_FMT_IA4:
+		d3d_fmt = D3DFMT_A4L4;
+		break;
 	case PC_TEX_FMT_I8:
 		d3d_fmt = D3DFMT_A8P8;
 		break;