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EnvMap.fx @ 1672

Revision 1672, 33.4 KB checked in by szirmay, 18 years ago (diff)

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[1488]	1	//--------------------------------------------------------------------------------------
	2	// File: EnvMap.fx
	3	//
	4	// The effect file for the OptimizedMesh sample.
	5	//
	6	// Copyright (c) Microsoft Corporation. All rights reserved.
	7	//--------------------------------------------------------------------------------------
	8
	9
	10	/// size of the cube map taken from the reference point of the object
	11	#define CUBEMAP_SIZE 128
	12	/// size of the cube map for diffuse/glossy reflections
	13	int LR_CUBEMAP_SIZE;
	14	#define PI 3.14159f
	15
	16
	17	//--------------------------------------------------------------------------------------
	18	// Global variables
	19	//--------------------------------------------------------------------------------------
	20
	21
	22	float4x4 World; ///< World matrix for the current object
	23	float4x4 WorldIT; ///< World matrix IT (inverse transposed) to transform surface normals of the current object
	24	float4x4 WorldView; ///< World * View matrix
	25	//float4x4 WorldViewIT; ///< World * View IT (inverse transposed) to transform surface normals of the current object
	26	float4x4 WorldViewProjection; ///< World * View * Projection matrix
	27
	28	float texel_size; ///< upload this constant every time the viewport changes
	29
	30	float4 eyePos; ///< current eye (camera) position
	31	float4 reference_pos; ///< Reference point for the last cube map generation.
	32
	33	int nFace; ///<
	34	int iShowCubeMap; ///<
	35	float4 objColor;
	36
	37	float intensity, shininess, brightness;
	38
	39
	40	//--------------------------------------------------------------------------------------
	41	// Textures & texture samplers
	42	//--------------------------------------------------------------------------------------
	43
	44
	45	texture EnvironmentMap, SmallEnvironmentMap, PreconvolvedEnvironmentMap, Decoration;
	46
	47	sampler EnvironmentMapSampler = sampler_state
	48	{
	49	/*MinFilter = LINEAR;
	50	MagFilter = LINEAR;
	51	MipFilter = LINEAR;*/
	52	Texture = <EnvironmentMap>;
	53	AddressU = WRAP;
	54	AddressV = WRAP;
	55	};
	56
	57	sampler PreconvolvedEnvironmentMapSampler = sampler_state
	58	{
	59	MinFilter = LINEAR;
	60	MagFilter = LINEAR;
	61	//MipFilter = LINEAR;
	62	Texture = <PreconvolvedEnvironmentMap>;
	63	AddressU = WRAP;
	64	AddressV = WRAP;
	65	};
	66
	67	sampler SmallEnvironmentMapSampler = sampler_state
	68	{
	69	// MinFilter = Point;
	70	// MagFilter = Point;
	71
	72	MinFilter = LINEAR;
	73	MagFilter = LINEAR;
	74
	75	//MipFilter = Point;
	76	Texture = <SmallEnvironmentMap>;
	77	AddressU = WRAP;
	78	AddressV = WRAP;
	79	};
	80
	81	sampler DecorationSampler = sampler_state
	82	{
	83	Texture = <Decoration>;
	84	MinFilter = LINEAR;
	85	MagFilter = LINEAR;
	86	//MipFilter = LINEAR;
	87	AddressU = CLAMP; //WRAP;
	88	AddressV = CLAMP; //WRAP;
	89	};
	90
	91
	92
	93	//--------------------------------------------------------------------------------------
	94	// Shader programs
	95	//--------------------------------------------------------------------------------------
	96
	97
	98
	99	void ReduceTextureVS( float4 position : POSITION,
	100	float4 color0 : COLOR0,
	101	float3 Normal : NORMAL,
	102	float2 Tex : TEXCOORD0,
	103	out float4 hposition : POSITION,
	104	out float4 color : COLOR0,
	105	out float2 oTex : TEXCOORD0,
	106	out float4 pos : TEXCOORD1 )
	107	{
	108	pos = position;
	109	hposition = pos;
	110	color = color0;
	111	oTex = Tex;
	112	}
	113
	114	/**
	115	\brief Downsamples a cube map face.
	116	*/
	117	#define _ReduceTexturePS( M ) \
	118	float4 ReduceTexture##M##PS( float2 Tex : TEXCOORD0, \
	119	float4 pos : TEXCOORD1, \
	120	float4 color0 : COLOR0 ) : COLOR0 \
	121	{ \
	122	/* offset to texel center */ \
	123	pos.xy += float2(1/(float)CUBEMAP_SIZE, -1/(float)CUBEMAP_SIZE); \
	124	/* transform position into texture coord */ \
	125	float2 tpos = pos.xy/2+0.5; /* rescale from -1..1 into range 0..1 */ \
	126	tpos.y = 1-tpos.y; \
	127	\
	128	float2 t; \
	129	float4 color = 0; \
	130	const int RATE = CUBEMAP_SIZE / M; \
	131	\
	132	for (int i = 0; i < RATE; i++) \
	133	for (int j = 0; j < RATE; j++) \
	134	{ \
	135	t.x = tpos.x + i/(float)CUBEMAP_SIZE; \
	136	t.y = tpos.y + j/(float)CUBEMAP_SIZE; \
	137	color += tex2D(DecorationSampler, t) / (RATE * RATE); \
	138	} \
	139	return color; \
	140	} // end of macro definition
	141
	142	_ReduceTexturePS( 2 );
	143	_ReduceTexturePS( 4 );
	144	_ReduceTexturePS( 8 );
	145	_ReduceTexturePS( 16 );
	146
	147
	148
	149	//--------------------------------------------------------------------------------------
	150	// Method #0: CLASSIC (pre-convolved)
	151	//--------------------------------------------------------------------------------------
	152
	153
	154
	155	/// \brief Returns the precalculated contribution of a texel with regard to the specified query direction.
	156	///
	157	/// \param q <b>query direction</b> (i.e. surface normal in diffuse case, ideal reflection direction in specular case).
	158	/// \param L vector pointing to the texel center
	159	float4 GetContr(float3 q, float3 L)
	160	// Lin * a * ( dw )
	161	// -- actually, dw is calculated by the caller --
	162	{
	163	//float shininess = 1;
	164	float fcos = max(dot(L, q), 0);
	165	// diffuse
	166	if (shininess <= 0)
	167	return 0.2 * fcos * texCUBE( SmallEnvironmentMapSampler, L);
	168	else
	169	{
	170	// some ad-hoc formula to avoid darkening
	171	float brightness = (pow(shininess,0.8)*0.2);
	172	return brightness * pow(fcos, shininess) * texCUBE( SmallEnvironmentMapSampler, L);
	173	}
	174	}
	175
	176	/// \brief Input for vertex shader ConvolutionVS().
	177	struct _ConvolutionVS_input {
	178	float4 Position : POSITION;
	179	};
	180
	181	/// \brief Input for pixel shader ::_ConvolutionPS().
	182	struct _ConvolutionVS_output {
	183	float4 hPosition : POSITION;
	184	float3 Position : TEXCOORD0;
	185	};
	186
	187	_ConvolutionVS_output ConvolutionVS(_ConvolutionVS_input IN) {
	188	_ConvolutionVS_output OUT;
	189	OUT.hPosition = IN.Position;
	190
	191	float2 pos = IN.Position.xy; // -1..1
	192
	193	pos.x += 0.5f / LR_CUBEMAP_SIZE;
	194	pos.y -= 0.5f / LR_CUBEMAP_SIZE;
	195
	196	if (nFace == 0) OUT.Position = float3(1, pos.y, -pos.x);
	197	if (nFace == 1) OUT.Position = float3(-1, pos.y, pos.x);
	198	if (nFace == 2) OUT.Position = float3(pos.x, 1, -pos.y);
	199	if (nFace == 3) OUT.Position = float3(pos.x,-1, pos.y);
	200	if (nFace == 4) OUT.Position = float3(pos.xy, 1);
	201	if (nFace == 5) OUT.Position = float3(-pos.x, pos.y,-1);
	202
	203	return OUT;
	204	}
	205
	206	/**
	207	\brief Convolves the values of a cube map of resoultion MxM.
	208
	209	Calculates the diffuse/specular irradiance map of resolution #LR_CUBEMAP_SIZE by summing up the contributions of all cube map texels
	210	with regard to the current query direction.
	211	*/
	212
	213	#define _ConvolutionPS( M ) \
	214	float4 Convolution##M##PS( _ConvolutionVS_output IN ) : COLOR \
	215	{ \
	216	/* input position = query direction for the result */ \
	217	float3 q = normalize( IN.Position ); \
	218	float4 color = 0; \
	219	\
	220	for (int i = 0; i < M; i++) \
	221	for (int j = 0; j < M; j++) \
	222	{ \
	223	float u = (i+0.5) / (float)M; \
	224	float v = (j+0.5) / (float)M; \
	225	float3 pos = float3( 2u-1, 1-2v, 1 ); \
	226	\
	227	float r = length(pos); \
	228	pos /= r; \
	229	\
	230	float4 dcolor = 0; \
	231	float3 L; \
	232	L = float3(pos.z, pos.y, -pos.x); dcolor += GetContr( q, L ); \
	233	L = float3(-pos.z, pos.y, pos.x); dcolor += GetContr( q, L ); \
	234	L = float3(pos.x, pos.z, -pos.y); dcolor += GetContr( q, L ); \
	235	L = float3(pos.x, -pos.z, pos.y); dcolor += GetContr( q, L ); \
	236	L = float3(pos.x, pos.y, pos.z); dcolor += GetContr( q, L ); \
	237	L = float3(-pos.x, pos.y, -pos.z); dcolor += GetContr( q, L ); \
	238	\
	239	float dw = 4 / (rrr); \
	240	color += dcolor * dw; \
	241	} \
	242	\
	243	return color / (M * M); \
	244	} /* end of macro definition */
	245
	246	_ConvolutionPS( 2 );
	247	_ConvolutionPS( 4 );
	248	_ConvolutionPS( 8 );
	249	_ConvolutionPS( 16 );
	250
	251	/// \brief Input for vertex shader EnvMapVS().
	252	struct _EnvMapVS_input
	253	{
	254	float4 Position : POSITION;
	255	float3 Normal : NORMAL;
	256	float2 TexCoord : TEXCOORD0;
	257	};
	258
	259	/// \brief Input for pixel shaders EnvMapDiffuseClassicPS(), ::_EnvMapDiffuseLocalizedPS(), EnvMapDiffuseLocalized5TexPS().
	260	struct _EnvMapVS_output
	261	{
	262	float4 hPosition : POSITION;
	263	float2 TexCoord : TEXCOORD0;
	264	float3 Normal : TEXCOORD1;
	265	float3 View : TEXCOORD2;
	266	float3 Position : TEXCOORD3;
	267	};
	268
	269	_EnvMapVS_output EnvMapVS( _EnvMapVS_input IN )
	270	{
	271	_EnvMapVS_output OUT;
	272
	273	OUT.Position = mul( IN.Position, World ).xyz; // scale & offset
	274	OUT.View = normalize( OUT.Position - eyePos );
	275	//OUT.Normal = IN.Normal;
	276	OUT.Normal = mul( IN.Normal, WorldIT ).xyz; // allow distortion/rotation
	277
	278	OUT.TexCoord = IN.TexCoord;
	279
	280	OUT.hPosition = mul( IN.Position, WorldViewProjection );
	281	return OUT;
	282	}
	283
	284	/// \brief Determines diffuse or specular illumination with a single lookup into #PreconvolvedEnvironmentMap.
	285	/// PreconvolvedEnvironmentMap is bound to EnvMap::pCubeTexturePreConvolved (cube map of resolution #LR_CUBEMAP_SIZE).
	286	float4 EnvMapDiffuseClassicPS( _EnvMapVS_output IN ) : COLOR
	287	{
	288	IN.View = normalize( IN.View );
	289	IN.Normal = normalize( IN.Normal );
	290
	291	float3 R = reflect(IN.View, IN.Normal);
	292
	293	if (shininess <= 0) // diffuse
	294	return intensity * texCUBE(PreconvolvedEnvironmentMapSampler, IN.Normal) *2;
	295	else // specular
	296	return intensity * texCUBE(PreconvolvedEnvironmentMapSampler, R) *2;
	297	}
	298
	299
	300
	301	//--------------------------------------------------------------------------------------
	302	// Method #1-#2: OUR METHOD
	303	//--------------------------------------------------------------------------------------
	304
	305
	306
	307	/// \brief Calculates the contribution of a single texel of #SmallEnvironmentMap to the illumination of the shaded point.
	308	/// To compute reflectivity, precalculated integral values are used.
	309	///
	310	/// \param L vector pointing to the center of the texel under examination. We assume that the largest coordinate component
	311	/// of L is equal to one, i.e. L points to the face of a cube of edge length of 2.
	312	/// \param pos is the position of the shaded point
	313	/// \param N is the surface normal at the shaded point
	314	/// \param V is the viewing direction at the shaded point
	315
	316
	317	float4 GetContr(int M, float3 L, float3 pos, float3 N, float3 V) // Phong-Blinn
	318	// L is strictly non-normalized
	319	{
	320	float l = length(L);
	321	L = normalize(L);
	322
	323	//Lin
	324	float4 Lin = texCUBE(SmallEnvironmentMapSampler, L);
	325
	326	//dw
	327	float dw = 4 / (MMlll + 4/2/3.1416f);
	328
	329	float dws = dw;
	330
	331	//r
	332	float doy = texCUBE(SmallEnvironmentMapSampler, L).a;
	333	float dxy = length(pos - L * doy);
	334
	335	//dws
	336	//dws = (doydoy dw) / (dxydxy(1 - dw/3.1416f) + doydoydw/3.1416f); // localization:
	337	//dws = (doydoy dw) / (dxydxy(1 - dw/2/3.1416f) + doydoydw/2/3.1416f); // localization:
	338
	339	float den = 1 + doydoy / (dxydxy) * ( (23.1416f)(23.1416f) / ((23.1416f-dw)(23.1416f-dw)) - 1 );
	340	dws = 23.1416f (1 - 1/sqrt(den));
	341
	342	float3 LL = L * doy - pos; // L should start from the object (and not from the reference point) !!!
	343	LL = normalize(LL);
	344
	345	float3 H = normalize(L + V); // halfway vector
	346	float3 R = reflect(-V, N); // reflection vector
	347
	348	// from texture
	349
	350	float4 color = 0;
	351
	352	float cos_value;
	353	if (shininess <= 0)
	354	cos_value = dot(N,L); // diffuse
	355	else cos_value = dot(R,L); // specular
	356
	357	float2 tex;
	358	tex.x = (cos_value + 1)/2;
	359	tex.y = dws/2/PI;
	360
	361	// lookup into precalculated reflectivity values
	362	cos_value = tex2D(DecorationSampler, tex).g * 3;
	363	color = Lin * 0.5 * cos_value;
	364
	365	return color;
	366	}
	367
	368	// Method #1
	369
	370	/// \brief Calculates diffuse or specular contributions of all texels in #SmallEnvironmentMap to the current point.
	371	/// For each texel of #SmallEnvironmentMap, function GetContr(int,float3,float3,float3,float3) is called.
	372
	373	#define _EnvMapDiffuseLocalizedPS( M ) \
	374	float4 EnvMapDiffuseLocalized##M##PS( _EnvMapVS_output IN ) : COLOR \
	375	{ \
	376	IN.View = -normalize( IN.View ); \
	377	IN.Normal = normalize( IN.Normal ); \
	378	IN.Position -= reference_pos.xyz; /* relative to the ref.point */ \
	379	\
	380	float3 R = -reflect( IN.View, IN.Normal ); /* reflection direction */ \
	381	\
	382	float4 I = 0; \
	383	\
	384	for (int x = 0; x < M; x++) /* foreach texel */ \
	385	for (int y = 0; y < M; y++) \
	386	{ \
	387	/* compute intensity for 6 texels with equal solid angles */ \
	388	\
	389	float2 tpos = float2( (x+0.5f)/M, (y+0.5f)/M ); /* texture coord (0..1) */ \
	390	\
	391	float2 p = float2(tpos.x, 1-tpos.y); \
	392	p.xy = 2p.xy - 1; / position (-1..1) */ \
	393	\
	394	I += GetContr( M, float3(p.x, p.y, 1), IN.Position, IN.Normal, IN.View ); \
	395	I += GetContr( M, float3(p.x, p.y, -1), IN.Position, IN.Normal, IN.View ); \
	396	I += GetContr( M, float3(p.x, 1, p.y), IN.Position, IN.Normal, IN.View ); \
	397	I += GetContr( M, float3(p.x, -1, p.y), IN.Position, IN.Normal, IN.View ); \
	398	I += GetContr( M, float3(1, p.x, p.y), IN.Position, IN.Normal, IN.View ); \
	399	I += GetContr( M, float3(-1, p.x, p.y), IN.Position, IN.Normal, IN.View ); \
	400	} \
	401	\
	402	return intensity * I; \
	403	} // end of macro definition
	404
	405	_EnvMapDiffuseLocalizedPS( 2 );
	406	_EnvMapDiffuseLocalizedPS( 4 );
	407	_EnvMapDiffuseLocalizedPS( 8 );
	408	_EnvMapDiffuseLocalizedPS( 16 );
	409
	410
	411	// Method #2
	412
	413	/// \brief Calculates diffuse or specular contributions of the 5 "most important" texels of #SmallEnvironmentMap to the current point.
	414	/// For these texels, function GetContr(int,float3,float3,float3,float3) is called.
	415
	416	float4 EnvMapDiffuseLocalized5TexPS( _EnvMapVS_output IN ) : COLOR
	417	{
	418	IN.View = -normalize( IN.View );
	419	IN.Normal = normalize( IN.Normal );
	420	// translate reference point to the origin
	421	IN.Position -= reference_pos.xyz;
	422
	423	float3 R = -reflect( IN.View, IN.Normal ); // reflection direction
	424
	425	float4 I = 0;
	426
	427	float3 q;
	428	if ( shininess <= 0 )
	429	q = IN.Normal; // diffuse
	430	else
	431	q = R;
	432
	433	float rr = max( max(abs(q.x), abs(q.y)), abs(q.z) ); // select the largest component
	434	q /= rr; // scale the largest component to value +/-1
	435
	436	float3 offset1 = float3(1,0,0); // default: largest: z
	437	float3 offset2 = float3(0,1,0); // select: x,y
	438
	439	if (abs(q.x) > abs(q.y) && abs(q.x) > abs(q.z)) { // largest: x
	440	offset1 = float3(0,0,1); // select y,z
	441	}
	442	if (abs(q.y) > abs(q.x) && abs(q.y) > abs(q.z)) { // largest: y
	443	offset2 = float3(0,0,1); // select x,z
	444	}
	445
	446	I += GetContr( LR_CUBEMAP_SIZE, q, IN.Position, IN.Normal, IN.View );
	447	I += GetContr( LR_CUBEMAP_SIZE, q + offset1*(2.0/LR_CUBEMAP_SIZE), IN.Position, IN.Normal, IN.View );
	448	I += GetContr( LR_CUBEMAP_SIZE, q - offset1*(2.0/LR_CUBEMAP_SIZE), IN.Position, IN.Normal, IN.View );
	449	I += GetContr( LR_CUBEMAP_SIZE, q + offset2*(2.0/LR_CUBEMAP_SIZE), IN.Position, IN.Normal, IN.View );
	450	I += GetContr( LR_CUBEMAP_SIZE, q - offset2*(2.0/LR_CUBEMAP_SIZE), IN.Position, IN.Normal, IN.View );
	451
	452	// since only 5 texels are considered, the result gets darker.
	453	// LR_CUBEMAP_SIZE is present to compensate this.
	454	return intensity * I * LR_CUBEMAP_SIZE / 2;
	455	}
	456
[1534]	457	// Method #3
[1488]	458
[1534]	459	/// \brief Calculates diffuse or specular contributions of the 5 "most important" texels of #SmallEnvironmentMap to the current point.
	460	/// For these texels, function GetContr(int,float3,float3,float3,float3) is called.
[1573]	461	float4 GetContibution(float3 L, float3 L1, float3 L2, float3 L3, float3 L4, float3 pos, float3 N, samplerCUBE cubemap)
[1534]	462	{
[1573]	463	float d;
[1574]	464	//d = texCUBE(cubemap, L).a;
	465	d = texCUBE(cubemap, L1).a;
[1534]	466	L1 = d * normalize(L1);
[1574]	467	d = texCUBE(cubemap, L2).a;
[1534]	468	L2 = d * normalize(L2);
[1574]	469	d = texCUBE(cubemap, L3).a;
[1573]	470	L3 = d * normalize(L3);
[1574]	471	d = texCUBE(cubemap, L4).a;
[1573]	472	L4 = d * normalize(L4);
	473
[1534]	474
	475	float3 r1 = normalize(L1 - pos);
	476	float3 r2 = normalize(L2 - pos);
	477	float3 r3 = normalize(L3 - pos);
	478	float3 r4 = normalize(L4 - pos);
[1574]	479	/*
[1534]	480	float tri1 = acos(dot(r1, r2)) * dot(cross(r1, r2), N);
	481	float tri2 = acos(dot(r2, r3)) * dot(cross(r2, r3), N);
	482	float tri3 = acos(dot(r3, r4)) * dot(cross(r3, r4), N);
	483	float tri4 = acos(dot(r4, r1)) * dot(cross(r4, r1), N);
[1574]	484	*/
	485	float3 crossP = cross(r1, r2);
	486	float r = length(crossP);
	487	float dd = dot(r1,r2);
	488	float tri1 = acos(dd) * dot(crossP/r, N);
	489
	490	crossP = cross(r2, r3);
	491	r = length(crossP);
	492	dd = dot(r1,r2);
	493	float tri2 = acos(dd) * dot(crossP/r, N);
	494
	495	crossP = cross(r3, r4);
	496	r = length(crossP);
	497	dd = dot(r1,r2);
	498	float tri3 = acos(dd) * dot(crossP/r, N);
	499
	500	crossP = cross(r4, r1);
	501	r = length(crossP);
	502	dd = dot(r1,r2);
	503	float tri4= acos(dd) * dot(crossP/r, N);
	504
	505
[1534]	506	return max(tri1 + tri2 + tri3 + tri4, 0);
	507	//return tri1 + tri2 + tri3 + tri4;
	508	}
	509
[1573]	510
	511
	512
[1534]	513	float4 EnvMapDiffuseLocalizedNewPS( _EnvMapVS_output IN ) : COLOR
	514	{
	515	float M = 4.0;
	516	IN.View = -normalize( IN.View );
	517	IN.Normal = normalize( IN.Normal );
	518	IN.Position -= reference_pos.xyz;
	519	float3 pos = IN.Position.xyz;
	520
	521	//return reference_pos;
	522	//return texCUBE(SmallEnvironmentMapSampler, pos);
	523
	524	float3 N =IN.Normal;
	525	float3 R = -reflect( IN.View, IN.Normal );
	526
	527	float4 I = 0;
	528	float3 L1, L2, L3, L4, L;
	529	float4 Le;
	530	float width = 1.0 / M;
[1573]	531	float width2 = width * 2;
	532	float d;
[1534]	533
[1672]	534	for (float x = 0; x < M; x++)
	535	for (float y = 0; y < M; y++)
[1534]	536	{
	537	float2 p, tpos;
[1573]	538	tpos.x = x * width;
	539	tpos.y = y * width;
[1534]	540
	541	p = tpos.xy;
	542	p = 2.0 * p - 1.0; //-1..1
	543
[1672]	544	L1 = float3(p.x, p.y, 1);
	545	L2 = float3(p.x + width2, p.y, 1);
	546	L3 = float3(p.x + width2, p.y + width2, 1);
	547	L4 = float3(p.x, p.y + width2, 1);
	548	L = float3(p.x + width, p.y + width, 1);
[1534]	549	Le = float4(texCUBE(SmallEnvironmentMapSampler, L).rgb, 1);
	550
[1573]	551	I += 0.5 * Le * GetContibution( L, L1, L2, L3, L4, pos, N, SmallEnvironmentMapSampler);
[1534]	552
[1573]	553	}
	554
[1672]	555	for (float x = 0; x < M; x++)
	556	for (float y = 0; y < M; y++)
[1534]	557	{
	558	float2 p, tpos;
[1573]	559	tpos.x = x * width; // 0..1
	560	tpos.y = y * width; // 0..1
[1534]	561
	562	p = tpos.xy;
	563	p = 2.0 * p - 1.0; //-1..1
	564
[1672]	565	L4 = float3(p.x, p.y, -1);
	566	L3 = float3(p.x + width2, p.y, -1);
	567	L2 = float3(p.x + width2, p.y + width2, -1);
	568	L1 = float3(p.x, p.y + width2, -1);
	569	L = float3(p.x + width, p.y + width, -1);
[1534]	570	Le = float4(texCUBE(SmallEnvironmentMapSampler, L).rgb, 1);
	571
[1573]	572	I += 0.5 * Le * GetContibution( L, L1, L2, L3, L4, pos, N, SmallEnvironmentMapSampler);
[1534]	573	}
	574
[1672]	575	for (float x = 0; x < M; x++)
	576	for (float y = 0; y < M; y++)
[1534]	577	{
	578	float2 p, tpos;
[1573]	579	tpos.x = x * width; // 0..1
	580	tpos.y = y * width; // 0..1
[1534]	581
	582	p = tpos.xy;
	583	p = 2.0 * p - 1.0; //-1..1
	584
[1672]	585	L4 = float3(p.x, 1, p.y);
	586	L3 = float3(p.x + width2, 1, p.y);
	587	L2 = float3(p.x + width2, 1, p.y + width2);
	588	L1 = float3(p.x, 1, p.y + width2);
	589	L = float3(p.x + width, 1, p.y + width);
[1534]	590	Le = float4(texCUBE(SmallEnvironmentMapSampler, L).rgb, 1);
	591
[1573]	592	I += 0.5 * Le * GetContibution( L, L1, L2, L3, L4, pos, N, SmallEnvironmentMapSampler);
[1534]	593	}
	594
[1672]	595	for (float x = 0; x < M; x++)
	596	for (float y = 0; y < M; y++)
[1534]	597	{
	598	float2 p, tpos;
[1573]	599	tpos.x = x * width; // 0..1
	600	tpos.y = y * width; // 0..1
[1534]	601
	602	p = tpos.xy;
	603	p = 2.0 * p - 1.0; //-1..1
	604
[1672]	605	L1 = float3(p.x, -1, p.y);
	606	L2 = float3(p.x + width2, -1, p.y);
	607	L3 = float3(p.x + width2, -1, p.y + width2);
	608	L4 = float3(p.x, -1, p.y + width2);
	609	L = float3(p.x + width, -1, p.y + width);
[1534]	610	Le = float4(texCUBE(SmallEnvironmentMapSampler, L).rgb, 1);
	611
[1573]	612	I += 0.5 * Le * GetContibution( L, L1, L2, L3, L4, pos, N, SmallEnvironmentMapSampler);
[1534]	613	}
[1573]	614
[1672]	615	for (float x = 0; x < M; x++)
	616	for (float y = 0; y < M; y++)
[1573]	617	{
[1534]	618	float2 p, tpos;
[1573]	619	tpos.x = x * width; // 0..1
	620	tpos.y = y * width; // 0..1
[1534]	621
	622	p = tpos.xy;
	623	p = 2.0 * p - 1.0; //-1..1
	624
[1672]	625	L1 = float3(1, p.x, p.y);
	626	L2 = float3(1, p.x + width2, p.y);
	627	L3 = float3(1, p.x + width2, p.y + width2);
	628	L4 = float3(1, p.x, p.y + width2);
	629	L = float3(1, p.x + width, p.y + width);
[1534]	630	Le = float4(texCUBE(SmallEnvironmentMapSampler, L).rgb, 1);
	631
[1573]	632	I += 0.5 * Le * GetContibution( L, L1, L2, L3, L4, pos, N, SmallEnvironmentMapSampler);
	633	}
[1534]	634
[1672]	635	for (float x = 0; x < M; x++)
	636	for (float y = 0; y < M; y++)
[1534]	637	{
	638	float2 p, tpos;
[1573]	639	tpos.x = x * width; // 0..1
	640	tpos.y = y * width; // 0..1
[1534]	641
	642	p = tpos.xy;
	643	p = 2.0 * p - 1.0; //-1..1
	644
[1672]	645	L4 = float3(-1, p.x, p.y);
	646	L3 = float3(-1, p.x + width2, p.y);
	647	L2 = float3(-1, p.x + width2, p.y + width2);
	648	L1 = float3(-1, p.x, p.y + width2);
	649	L = float3(-1, p.x + width, p.y + width);
[1534]	650	Le = float4(texCUBE(SmallEnvironmentMapSampler, L).rgb, 1);
	651
[1573]	652	I += 0.5 * Le * GetContibution( L, L1, L2, L3, L4, pos, N, SmallEnvironmentMapSampler);
	653	}
[1534]	654	return intensity * I;
	655	}
	656
[1573]	657	float4 P2PContr(float3 N, float3 Nl, float3 pos, float3 L, samplerCUBE cubemap)
	658	{
	659	Nl = normalize(Nl);
	660	L = normalize(L);
	661	float4 Le = float4(texCUBE(cubemap, L).rgb, 1);
	662	float d = texCUBE(cubemap, L).a;
	663	float3 Lpos = L * d;
	664	float3 Ldir = Lpos - pos;
	665	float dist = dot(Ldir, Ldir);
	666	Ldir = normalize(Ldir);
	667
	668	return Le * max(dot(N, Ldir),0) * dot(Nl, -1 * Ldir) / dist;
	669	}
[1534]	670
[1573]	671	float4 EnvMapDiffuseP2PPS( _EnvMapVS_output IN ) : COLOR
	672	{
	673	float M = 4.0;
	674	IN.View = -normalize( IN.View );
	675	IN.Normal = normalize( IN.Normal );
	676	IN.Position -= reference_pos.xyz;
	677	float3 pos = IN.Position.xyz;
	678
	679	//return reference_pos;
	680	//return texCUBE(SmallEnvironmentMapSampler, pos);
	681
	682	float3 N =IN.Normal;
	683
	684	float4 I = 0;
	685	float3 L;
	686	float4 Le;
	687	float width = 1.0 / M;
	688	float d;
	689
	690	for (float x = 0.5; x < M; x++)
	691	for (float y = 0.5; y < M; y++)
	692	{
	693	float2 p, tpos;
	694	tpos.x = x * width;
	695	tpos.y = y * width;
	696
	697	p = tpos.xy;
	698	p = 2.0 * p - 1.0; //-1..1
	699
	700	I += P2PContr(N, float3(0,0,-1), pos, float3(p.x, p.y, 1), SmallEnvironmentMapSampler);
	701	I += P2PContr(N, float3(0,0,1), pos, float3(-p.x, p.y, -1), SmallEnvironmentMapSampler);
	702	I += P2PContr(N, float3(-1,0,0), pos, float3(1, p.y, -p.x), SmallEnvironmentMapSampler);
	703	I += P2PContr(N, float3(1,0,0), pos, float3(-1, p.y, p.x), SmallEnvironmentMapSampler);
	704	I += P2PContr(N, float3(0,-1,0), pos, float3(p.x, 1, -p.y), SmallEnvironmentMapSampler);
	705	I += P2PContr(N, float3(0,1,0), pos, float3(p.x, -1, p.y), SmallEnvironmentMapSampler);
	706	}
	707
	708	return intensity * I;
	709	}
[1672]	710
	711	float4 EnvMapDiffuseAdaptPS( _EnvMapVS_output IN ) : COLOR
	712	{
	713	float M = 4.0;
	714	IN.View = -normalize( IN.View );
	715	IN.Normal = normalize( IN.Normal );
	716	IN.Position -= reference_pos.xyz;
	717	float3 pos = IN.Position.xyz;
	718
	719	//return reference_pos;
	720	//return texCUBE(SmallEnvironmentMapSampler, pos);
	721
	722	float3 N =IN.Normal;
	723	float3 R = -reflect( IN.View, IN.Normal );
	724
	725	float4 I = 0;
	726	float3 L1, L2, L3, L4, L;
	727	float4 Le;
	728	float Ld;
	729	float width = 1.0 / M;
	730	float width2 = width * 2;
	731	float d;
	732
	733	for (float x = 0; x < M; x++)
	734	for (float y = 0; y < M; y++)
	735	{
	736	float2 p, tpos;
	737	tpos.x = x * width;
	738	tpos.y = y * width;
	739
	740	p = tpos.xy;
	741	p = 2.0 * p - 1.0; //-1..1
	742
	743	L = float3(p.x + width, p.y + width, 1);
	744	Ld = texCUBE(SmallEnvironmentMapSampler, L).a;
	745
	746	float dist = length(normalize(L) * Ld - pos);
	747	if(dist < 1.0)
	748	{
	749	L1 = float3(p.x, p.y, 1);
	750	L2 = float3(p.x + width2, p.y, 1);
	751	L3 = float3(p.x + width2, p.y + width2, 1);
	752	L4 = float3(p.x, p.y + width2, 1);
	753	Le = float4(texCUBE(SmallEnvironmentMapSampler, L).rgb, 1);
	754
	755	I += 0.5 * Le * GetContibution( L, L1, L2, L3, L4, pos, N, SmallEnvironmentMapSampler);
	756	}
	757	else
	758	I += P2PContr(N, float3(0,0,-1), pos, L, SmallEnvironmentMapSampler);
	759
	760	}
	761
	762	for (float x = 0; x < M; x++)
	763	for (float y = 0; y < M; y++)
	764	{
	765	float2 p, tpos;
	766	tpos.x = x * width; // 0..1
	767	tpos.y = y * width; // 0..1
	768
	769	p = tpos.xy;
	770	p = 2.0 * p - 1.0; //-1..1
	771
	772	L = float3(p.x + width, p.y + width, -1);
	773	Ld = texCUBE(SmallEnvironmentMapSampler, L).a;
	774
	775	float dist = length(normalize(L) * Ld - pos);
	776	if(dist < 1.0)
	777	{
	778	L4 = float3(p.x, p.y, -1);
	779	L3 = float3(p.x + width2, p.y, -1);
	780	L2 = float3(p.x + width2, p.y + width2, -1);
	781	L1 = float3(p.x, p.y + width2, -1);
	782	Le = float4(texCUBE(SmallEnvironmentMapSampler, L).rgb, 1);
	783
	784	I += 0.5 * Le * GetContibution( L, L1, L2, L3, L4, pos, N, SmallEnvironmentMapSampler);
	785	}
	786	else
	787	I += P2PContr(N, float3(0,0,1), pos, L, SmallEnvironmentMapSampler);
	788	}
	789
	790	for (float x = 0; x < M; x++)
	791	for (float y = 0; y < M; y++)
	792	{
	793	float2 p, tpos;
	794	tpos.x = x * width; // 0..1
	795	tpos.y = y * width; // 0..1
	796
	797	p = tpos.xy;
	798	p = 2.0 * p - 1.0; //-1..1
	799
	800	L = float3(p.x + width, 1, p.y + width);
	801	Ld = texCUBE(SmallEnvironmentMapSampler, L).a;
	802
	803	float dist = length(normalize(L) * Ld - pos);
	804	if(dist < 1.0)
	805	{
	806	L4 = float3(p.x, 1, p.y);
	807	L3 = float3(p.x + width2, 1, p.y);
	808	L2 = float3(p.x + width2, 1, p.y + width2);
	809	L1 = float3(p.x, 1, p.y + width2);
	810	Le = float4(texCUBE(SmallEnvironmentMapSampler, L).rgb, 1);
	811
	812	I += 0.5 * Le * GetContibution( L, L1, L2, L3, L4, pos, N, SmallEnvironmentMapSampler);
	813	}
	814	else
	815	I += P2PContr(N, float3(0,-1,0), pos, L, SmallEnvironmentMapSampler);
	816
	817	}
	818
	819	for (float x = 0; x < M; x++)
	820	for (float y = 0; y < M; y++)
	821	{
	822	float2 p, tpos;
	823	tpos.x = x * width; // 0..1
	824	tpos.y = y * width; // 0..1
	825
	826	p = tpos.xy;
	827	p = 2.0 * p - 1.0; //-1..1
	828
	829	L = float3(p.x + width, -1, p.y + width);
	830	Ld = texCUBE(SmallEnvironmentMapSampler, L).a;
	831
	832	float dist = length(normalize(L) * Ld - pos);
	833	if(dist < 1.0)
	834	{
	835	L1 = float3(p.x, -1, p.y);
	836	L2 = float3(p.x + width2, -1, p.y);
	837	L3 = float3(p.x + width2, -1, p.y + width2);
	838	L4 = float3(p.x, -1, p.y + width2);
	839	Le = float4(texCUBE(SmallEnvironmentMapSampler, L).rgb, 1);
	840
	841	I += 0.5 * Le * GetContibution( L, L1, L2, L3, L4, pos, N, SmallEnvironmentMapSampler);
	842	}
	843	else
	844	I += P2PContr(N, float3(0,1,0), pos, L, SmallEnvironmentMapSampler);
	845
	846	}
	847
	848	for (float x = 0; x < M; x++)
	849	for (float y = 0; y < M; y++)
	850	{
	851	float2 p, tpos;
	852	tpos.x = x * width; // 0..1
	853	tpos.y = y * width; // 0..1
	854
	855	p = tpos.xy;
	856	p = 2.0 * p - 1.0; //-1..1
	857
	858	L = float3(1, p.x + width, p.y + width);
	859	Ld = texCUBE(SmallEnvironmentMapSampler, L).a;
	860	float dist = length(normalize(L) * Ld - pos);
	861	if(dist < 1.0)
	862	{
	863	L1 = float3(1, p.x, p.y);
	864	L2 = float3(1, p.x + width2, p.y);
	865	L3 = float3(1, p.x + width2, p.y + width2);
	866	L4 = float3(1, p.x, p.y + width2);
	867	Le = float4(texCUBE(SmallEnvironmentMapSampler, L).rgb, 1);
	868
	869	I += 0.5 * Le * GetContibution( L, L1, L2, L3, L4, pos, N, SmallEnvironmentMapSampler);
	870	}
	871	else
	872	I += P2PContr(N, float3(-1,0,0), pos, L, SmallEnvironmentMapSampler);
	873
	874	}
	875
	876	for (float x = 0; x < M; x++)
	877	for (float y = 0; y < M; y++)
	878	{
	879	float2 p, tpos;
	880	tpos.x = x * width; // 0..1
	881	tpos.y = y * width; // 0..1
	882
	883	p = tpos.xy;
	884	p = 2.0 * p - 1.0; //-1..1
	885
	886	L = float3(-1, p.x + width, p.y + width);
	887	Ld = texCUBE(SmallEnvironmentMapSampler, L).a;
	888	float dist = length(normalize(L) * Ld - pos);
	889	if(dist < 1.0)
	890	{
	891	L4 = float3(-1, p.x, p.y);
	892	L3 = float3(-1, p.x + width2, p.y);
	893	L2 = float3(-1, p.x + width2, p.y + width2);
	894	L1 = float3(-1, p.x, p.y + width2);
	895	Le = float4(texCUBE(SmallEnvironmentMapSampler, L).rgb, 1);
	896
	897	I += 0.5 * Le * GetContibution( L, L1, L2, L3, L4, pos, N, SmallEnvironmentMapSampler);
	898
	899	}
	900	else
	901	I += P2PContr(N, float3(1,0,0), pos, L, SmallEnvironmentMapSampler);
	902	}
	903	return intensity * I;
	904	}
[1488]	905	//--------------------------------------------------------------------------------------
	906	// Shading the environment
	907	//--------------------------------------------------------------------------------------
	908
	909	/// \brief Input for vertex shader IlluminatedSceneVS().
	910	struct _IlluminatedSceneVS_input {
	911	float4 Position : POSITION;
	912	float3 Normal : NORMAL;
	913	float2 TexCoord : TEXCOORD0;
	914	};
	915
	916	/// \brief Input for pixel shader IlluminatedScenePS().
	917	struct _IlluminatedSceneVS_output {
	918	float4 hPosition : POSITION;
	919	float2 TexCoord : TEXCOORD0;
	920	float3 Position : TEXCOORD1;
	921	};
	922
	923	_IlluminatedSceneVS_output IlluminatedSceneVS( _IlluminatedSceneVS_input IN )
	924	{
	925	_IlluminatedSceneVS_output OUT;
	926	OUT.hPosition = mul( IN.Position, WorldViewProjection );
	927
	928	// texel_size as uniform parameter
	929	OUT.hPosition.x -= texel_size * OUT.hPosition.w;
	930	OUT.hPosition.y += texel_size * OUT.hPosition.w;
	931
	932	if (iShowCubeMap > 0)
	933	{
	934	// if one of the cube maps is displayed on the walls,
	935	// position is simply forwarded
	936	OUT.Position = IN.Position;
	937	}
	938	else
	939	{
	940	// also consider camera orientation
	941	OUT.Position = mul( IN.Position, WorldView );
	942	}
	943
	944	OUT.TexCoord = IN.TexCoord;
	945	return OUT;
	946	}
	947
	948	/// Displays the environment with a simple shading
	949	float4 IlluminatedScenePS( _IlluminatedSceneVS_output IN ) : COLOR0
	950	{
[1573]	951	float3 color = objColor * tex2D(DecorationSampler, IN.TexCoord);
[1574]	952
[1488]	953	if (iShowCubeMap > 0)
	954	{
	955	// if one of the cube maps should be displayed on the walls,
	956	// display it
	957	color = texCUBE(EnvironmentMapSampler, IN.Position) * intensity;
	958	}
	959	else if (brightness>0)
	960	{
	961	// create an exponential falloff for each face of the room
	962	float3 L = float3(2IN.TexCoord.x-1, 2IN.TexCoord.y-1, -1);
	963	L = normalize(L);
	964	float3 N = float3(0,0,1);
	965	color = abs(pow(dot(L,N), 4)) brightness;
	966	}
[1574]	967	else color *= 0.7;
[1573]	968
[1488]	969	float dist = length( IN.Position );
	970	return float4(color, dist);
	971	}
	972
	973
	974
	975
	976	//--------------------------------------------------------------------------------------
	977	// Techniques
	978	//--------------------------------------------------------------------------------------
	979
	980
	981	/// a helpful macro to define techniques with a common vertex program
	982	#define TechniqueUsingCommonVS(name); \
	983	technique name \
	984	{ \
	985	pass p0 \
	986	{ \
	987	VertexShader = compile vs_3_0 EnvMapVS(); \
	988	PixelShader = compile ps_3_0 name##PS(); \
	989	} \
	990	}
	991
	992	TechniqueUsingCommonVS( EnvMapDiffuseClassic );
	993	TechniqueUsingCommonVS( EnvMapDiffuseLocalized5Tex );
	994
	995	//TechniqueUsingCommonVS( EnvMapDiffuseLocalized );
	996	TechniqueUsingCommonVS( EnvMapDiffuseLocalized2 );
	997	TechniqueUsingCommonVS( EnvMapDiffuseLocalized4 );
	998	TechniqueUsingCommonVS( EnvMapDiffuseLocalized8 );
	999	TechniqueUsingCommonVS( EnvMapDiffuseLocalized16 );
	1000
[1534]	1001	TechniqueUsingCommonVS( EnvMapDiffuseLocalizedNew );
[1573]	1002	TechniqueUsingCommonVS( EnvMapDiffuseP2P );
[1672]	1003	TechniqueUsingCommonVS( EnvMapDiffuseAdapt );
[1534]	1004
[1488]	1005	#define ReduceTextureTechnique(M); \
	1006	technique ReduceTexture##M \
	1007	{ \
	1008	pass p0 \
	1009	{ \
	1010	VertexShader = compile vs_3_0 ReduceTextureVS(); \
	1011	PixelShader = compile ps_3_0 ReduceTexture##M##PS(); \
	1012	} \
	1013	}
	1014
	1015	ReduceTextureTechnique( 2 );
	1016	ReduceTextureTechnique( 4 );
	1017	ReduceTextureTechnique( 8 );
	1018	ReduceTextureTechnique( 16 );
	1019
	1020	#define ConvolutionTechnique(M); \
	1021	technique Convolution##M \
	1022	{ \
	1023	pass p0 \
	1024	{ \
	1025	VertexShader = compile vs_3_0 ConvolutionVS(); \
	1026	PixelShader = compile ps_3_0 Convolution##M##PS(); \
	1027	} \
	1028	}
	1029
	1030	ConvolutionTechnique( 2 );
	1031	ConvolutionTechnique( 4 );
	1032	ConvolutionTechnique( 8 );
	1033	ConvolutionTechnique( 16 );
	1034
	1035	/// a helpful macro to define techniques
	1036	/// where the name of EnvMapVS program is <TechniqueName>VS
	1037	/// and the name of PS program is <TechniqueName>PS
	1038	#define Technique(name); \
	1039	technique name \
	1040	{ \
	1041	pass p0 \
	1042	{ \
	1043	VertexShader = compile vs_3_0 name##VS(); \
	1044	PixelShader = compile ps_3_0 name##PS(); \
	1045	} \
	1046	}
	1047
	1048	Technique( IlluminatedScene );
	1049	//Technique( Convolution );
	1050	//Technique( ReduceTexture );

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