From 06e741c847a22b0510d83629650954cab0834202 Mon Sep 17 00:00:00 2001
From: divverent <divverent@d7cf8633-e32d-0410-b094-e92efae38249>
Date: Sun, 5 Jun 2011 14:55:41 +0000
Subject: [PATCH] initial attempt do do r_trippy in HLSL

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@11181 d7cf8633-e32d-0410-b094-e92efae38249
---
 shader_hlsl.h | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)

diff --git a/shader_hlsl.h b/shader_hlsl.h
index 5e271ce9..c93d4724 100644
--- a/shader_hlsl.h
+++ b/shader_hlsl.h
@@ -27,6 +27,32 @@
 "#endif\n"
 "#endif\n"
 "\n"
+"#ifdef VERTEX_SHADER\n"
+"#ifdef USETRIPPY\n"
+"// LordHavoc: based on shader code linked at: http://www.youtube.com/watch?v=JpksyojwqzE\n"
+"// tweaked scale\n"
+"float4 TrippyVertex(float4 position)\n"
+"(\n"
+"uniform float ClientTime : register(c2)\n"
+")\n"
+"{\n"
+"	float worldTime = ClientTime;\n"
+"	// tweaked for Quake\n"
+"	worldTime *= 10.0;\n"
+"	position *= 0.125;\n"
+"	//~tweaked for Quake\n"
+"	float distanceSquared = (position.x * position.x + position.z * position.z);\n"
+"	position.y += 5.0*sin(distanceSquared*sin(worldTime/143.0)/1000.0);\n"
+"	float y = position.y;\n"
+"	float x = position.x;\n"
+"	float om = sin(distanceSquared*sin(worldTime/256.0)/5000.0) * sin(worldTime/200.0);\n"
+"	position.y = x*sin(om)+y*cos(om);\n"
+"	position.x = x*cos(om)-y*sin(om);\n"
+"	return position;\n"
+"}\n"
+"#endif\n"
+"#endif\n"
+"\n"
 "#ifdef MODE_DEPTH_OR_SHADOW\n"
 "#ifdef VERTEX_SHADER\n"
 "void main\n"
@@ -38,6 +64,9 @@
 ")\n"
 "{\n"
 "	gl_Position = mul(ModelViewProjectionMatrix, gl_Vertex);\n"
+"#ifdef USETRIPPY\n"
+"	gl_Position = TrippyVertex(gl_Position);\n"
+"#endif\n"
 "	Depth = gl_Position.z;\n"
 "}\n"
 "#endif\n"
@@ -72,6 +101,9 @@
 ")\n"
 "{\n"
 "	gl_Position = mul(ModelViewProjectionMatrix, gl_Vertex);\n"
+"#ifdef USETRIPPY\n"
+"	gl_Position = TrippyVertex(gl_Position);\n"
+"#endif\n"
 "	gl_FrontColor = float4(gl_Position.z, gl_Position.z, gl_Position.z, 1.0);\n"
 "}\n"
 "#endif\n"
@@ -244,6 +276,9 @@
 "	TexCoord2 = gl_MultiTexCoord1.xy;\n"
 "#endif\n"
 "	gl_Position = mul(ModelViewProjectionMatrix, gl_Vertex);\n"
+"#ifdef USETRIPPY\n"
+"	gl_Position = TrippyVertex(gl_Position);\n"
+"#endif\n"
 "}\n"
 "#endif\n"
 "\n"
@@ -348,6 +383,9 @@
 "	TexCoord = mul(TexMatrix, gl_MultiTexCoord0).xy;\n"
 "	gl_Position = mul(ModelViewProjectionMatrix, gl_Vertex);\n"
 "	ModelViewProjectionPosition = gl_Position;\n"
+"#ifdef USETRIPPY\n"
+"	gl_Position = TrippyVertex(gl_Position);\n"
+"#endif\n"
 "}\n"
 "#endif\n"
 "\n"
@@ -415,6 +453,9 @@
 "	EyeVector.z = dot(EyeVectorModelSpace, gl_MultiTexCoord3.xyz);\n"
 "	gl_Position = mul(ModelViewProjectionMatrix, gl_Vertex);\n"
 "	ModelViewProjectionPosition = gl_Position;\n"
+"#ifdef USETRIPPY\n"
+"	gl_Position = TrippyVertex(gl_Position);\n"
+"#endif\n"
 "}\n"
 "#endif\n"
 "\n"
@@ -711,6 +752,9 @@
 "	VectorT = mul(ModelViewMatrix, float4(gl_MultiTexCoord2.xyz, 0)).xyz;\n"
 "	VectorR.xyz = mul(ModelViewMatrix, float4(gl_MultiTexCoord3.xyz, 0)).xyz;\n"
 "	gl_Position = mul(ModelViewProjectionMatrix, gl_Vertex);\n"
+"#ifdef USETRIPPY\n"
+"	gl_Position = TrippyVertex(gl_Position);\n"
+"#endif\n"
 "	VectorR.w = gl_Position.z;\n"
 "}\n"
 "#endif // VERTEX_SHADER\n"
@@ -1053,6 +1097,9 @@
 "#ifdef USEREFLECTION\n"
 "	ModelViewProjectionPosition = gl_Position;\n"
 "#endif\n"
+"#ifdef USETRIPPY\n"
+"	gl_Position = TrippyVertex(gl_Position);\n"
+"#endif\n"
 "}\n"
 "#endif // VERTEX_SHADER\n"
 "\n"
-- 
2.39.2