From: uis <uis9936@gmail.com>
Date: Wed, 3 Jan 2024 21:01:49 +0000 (+0300)
Subject: Small change to offset mapping
X-Git-Url: https://git.rm.cloudns.org/?a=commitdiff_plain;h=e2693f1d8e780bb99f4b51505a1ced8cebc86cd2;p=xonotic%2Fdarkplaces.git

Small change to offset mapping

Adds few fps. Function seems to be too complex for my understanding.
---

diff --git a/shader_glsl.h b/shader_glsl.h
index f7a4d490..3ce89226 100644
--- a/shader_glsl.h
+++ b/shader_glsl.h
@@ -884,8 +884,7 @@
 "#else\n",
 "	mediump float LODSteps = ceil(GuessLODFactor * OffsetMapping_ScaleSteps.y);\n",
 "#endif\n",
-"	mediump float LODFactor = LODSteps / OffsetMapping_ScaleSteps.y;\n",
-"	mediump vec4 ScaleSteps = vec4(OffsetMapping_ScaleSteps.x, LODSteps, 1.0 / LODSteps, OffsetMapping_ScaleSteps.w * LODFactor);\n",
+"	mediump vec4 ScaleSteps = vec4(OffsetMapping_ScaleSteps.x, LODSteps, vec2(1.0, OffsetMapping_ScaleSteps.w * LODSteps) / vec2(LODSteps, OffsetMapping_ScaleSteps.y));\n",
 "#else\n",
 "	#define ScaleSteps OffsetMapping_ScaleSteps\n",
 "#endif\n",
@@ -911,9 +910,10 @@
 "	//vec2 OffsetVector = vec2(normalize(EyeVectorFogDepth.xy) * ScaleSteps.x * vec2(-1, 1));\n",
 "	vec2 OffsetVector = vec2(normalize(EyeVectorFogDepth.xyz).xy * ScaleSteps.x * vec2(-1, 1));\n",
 "	OffsetVector *= ScaleSteps.z;\n",
+"	vec2 OneMinusBias_OffsetVector = (1.0 - OffsetMapping_Bias) * OffsetVector;\n",
 "	for(i = 0.0; i < ScaleSteps.y; ++i)\n",
-"		TexCoord += OffsetVector * ((1.0 - OffsetMapping_Bias) - dp_textureGrad(Texture_Normal, TexCoord, dPdx, dPdy).a);\n",
-"	return TexCoord;\n",
+"		TexCoord += -dp_textureGrad(Texture_Normal, TexCoord, dPdx, dPdy).a * OffsetVector + OneMinusBias_OffsetVector;\n",
+"	return TexCoord;\n"
 "#endif\n",
 "}\n",
 "#endif // USEOFFSETMAPPING\n",