From 3e6efdb53ec30fe65173c20ddbf97798f41ef7a7 Mon Sep 17 00:00:00 2001
From: Tony Wasserka <NeoBrainX@gmail.com>
Date: Sun, 27 Oct 2013 14:43:29 +0100
Subject: [PATCH] LightingShaderGen: Perform more lighting calculations with
 integers.

---
 Source/Core/VideoCommon/LightingShaderGen.h | 18 +++++++++---------
 Source/Core/VideoCommon/PixelShaderGen.cpp  |  3 +--
 Source/Core/VideoCommon/VertexShaderGen.cpp |  3 +--
 3 files changed, 11 insertions(+), 13 deletions(-)

diff --git a/Source/Core/VideoCommon/LightingShaderGen.h b/Source/Core/VideoCommon/LightingShaderGen.h
index 578a56d42a..87b4e3c14e 100644
--- a/Source/Core/VideoCommon/LightingShaderGen.h
+++ b/Source/Core/VideoCommon/LightingShaderGen.h
@@ -128,15 +128,15 @@ static void GenerateLightingShader(T& object, LightingUidData& uid_data, int com
 		if (color.matsource) // from vertex
 		{
 			if (components & (VB_HAS_COL0 << j))
-				object.Write("mat = %s%d;\n", inColorName, j);
+				object.Write("int4 mat = int4(round(%s%d * 255.0));\n", inColorName, j);
 			else if (components & VB_HAS_COL0)
-				object.Write("mat = %s0;\n", inColorName);
+				object.Write("int4 mat = int4(round(%s0 * 255.0));\n", inColorName);
 			else
-				object.Write("mat = float4(1.0, 1.0, 1.0, 1.0);\n");
+				object.Write("int4 mat = int4(255, 255, 255, 255);\n");
 		}
 		else // from color
 		{
-			object.Write("mat = float4(%s[%d])/255.0;\n", materialsName, j+2);
+			object.Write("int4 mat = %s[%d];\n", materialsName, j+2);
 		}
 
 		uid_data.enablelighting |= xfregs.color[j].enablelighting << j;
@@ -172,14 +172,14 @@ static void GenerateLightingShader(T& object, LightingUidData& uid_data, int com
 			if (alpha.matsource) // from vertex
 			{
 				if (components & (VB_HAS_COL0<<j))
-					object.Write("mat.w = %s%d.w;\n", inColorName, j);
+					object.Write("mat.w = int(round(%s%d.w * 255.0));\n", inColorName, j);
 				else if (components & VB_HAS_COL0)
-					object.Write("mat.w = %s0.w;\n", inColorName);
-				else object.Write("mat.w = 1.0;\n");
+					object.Write("mat.w = int(round(%s0.w * 255.0));\n", inColorName);
+				else object.Write("mat.w = 255;\n");
 			}
 			else // from color
 			{
-				object.Write("mat.w = float(%s[%d].w) / 255.0;\n", materialsName, j+2);
+				object.Write("mat.w = %s[%d].w;\n", materialsName, j+2);
 			}
 		}
 
@@ -255,7 +255,7 @@ static void GenerateLightingShader(T& object, LightingUidData& uid_data, int com
 					GenerateLightShader<T>(object, uid_data, i, lit_index, lightsColName, lightsName, coloralpha);
 			}
 		}
-		object.Write("%s%d = mat * float4(clamp(lacc, 0, 255)) / 255.0;\n", dest, j);
+		object.Write("%s%d = float4(mat * clamp(lacc, 0, 255) / 255) / 255.0;\n", dest, j);
 		object.Write("}\n");
 	}
 }
diff --git a/Source/Core/VideoCommon/PixelShaderGen.cpp b/Source/Core/VideoCommon/PixelShaderGen.cpp
index c08386dd59..6baf6d0907 100644
--- a/Source/Core/VideoCommon/PixelShaderGen.cpp
+++ b/Source/Core/VideoCommon/PixelShaderGen.cpp
@@ -413,8 +413,7 @@ static inline void GeneratePixelShader(T& out, DSTALPHA_MODE dstAlphaMode, API_T
 		out.Write("\tfloat3 _norm0 = normalize(Normal.xyz);\n\n");
 		out.Write("\tfloat3 pos = float3(clipPos.x,clipPos.y,Normal.w);\n");
 
-		out.Write("\tfloat4 mat;\n"
-				"\tint4 lacc;\n"
+		out.Write("\tint4 lacc;\n"
 				"\tfloat3 ldir, h;\n"
 				"\tfloat dist, dist2, attn;\n");
 
diff --git a/Source/Core/VideoCommon/VertexShaderGen.cpp b/Source/Core/VideoCommon/VertexShaderGen.cpp
index 860f5f36a6..448b0deb04 100644
--- a/Source/Core/VideoCommon/VertexShaderGen.cpp
+++ b/Source/Core/VideoCommon/VertexShaderGen.cpp
@@ -218,8 +218,7 @@ static inline void GenerateVertexShader(T& out, u32 components, API_TYPE api_typ
 
 	out.Write("o.pos = float4(dot(" I_PROJECTION"[0], pos), dot(" I_PROJECTION"[1], pos), dot(" I_PROJECTION"[2], pos), dot(" I_PROJECTION"[3], pos));\n");
 
-	out.Write("float4 mat;\n"
-			"int4 lacc;\n"
+	out.Write("int4 lacc;\n"
 			"float3 ldir, h;\n"
 			"float dist, dist2, attn;\n");