1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
/*
* $RCSfile$
*
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any
* kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
* EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
* NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
* USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
* ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
* CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
* REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
* INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed, licensed or
* intended for use in the design, construction, operation or
* maintenance of any nuclear facility.
*
* $Revision$
* $Date$
* $State$
*/
/*********************************************************************NVMH3****
Path: NVSDK\Common\media\programs
File: simple.cg
Copyright NVIDIA Corporation 2002
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, THIS SOFTWARE IS PROVIDED
*AS IS* AND NVIDIA AND ITS SUPPLIERS DISCLAIM ALL WARRANTIES, EITHER EXPRESS
OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL NVIDIA OR ITS SUPPLIERS
BE LIABLE FOR ANY SPECIAL, INCIDENTAL, INDIRECT, OR CONSEQUENTIAL DAMAGES
WHATSOEVER (INCLUDING, WITHOUT LIMITATION, DAMAGES FOR LOSS OF BUSINESS PROFITS,
BUSINESS INTERRUPTION, LOSS OF BUSINESS INFORMATION, OR ANY OTHER PECUNIARY LOSS)
ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF NVIDIA HAS
BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Comments:
******************************************************************************/
// Simple vertex shader, derived from NVIDIA's simple.cg sample
// shader, that modulates the lit color with a noise pattern based on
// vertex position.
// define inputs from application
struct appin
{
float4 Position : POSITION;
float4 Normal : NORMAL;
};
// define outputs from vertex shader
struct vertout
{
float4 HPosition : POSITION;
float4 FragPos : TEXCOORD0;
float4 Color0 : COLOR0;
};
vertout main(appin IN,
uniform float4x4 ModelViewProj,
uniform float4x4 ModelViewIT,
uniform float4 LightVec,
uniform float4 LightColor,
uniform float4 DiffuseMaterial,
uniform float4 SpecularMaterial)
{
vertout OUT;
// Assume that the profile is PROFILE_ARBVP1...
// #ifdef PROFILE_ARBVP1
ModelViewProj = glstate.matrix.mvp;
ModelViewIT = glstate.matrix.invtrans.modelview[0];
LightVec = glstate.light[0].position;
LightColor = glstate.light[0].diffuse;
DiffuseMaterial = glstate.material.front.diffuse;
SpecularMaterial = glstate.material.front.specular;
// #endif
// transform vertex position into homogenous clip-space
OUT.HPosition = mul(ModelViewProj, IN.Position);
// Output the post-perspective-divide position as FragPos
float invW = 1.0f / OUT.HPosition.w;
OUT.FragPos = OUT.HPosition * invW;
// transform normal from model-space to view-space
float3 normalVec = normalize(mul(ModelViewIT, IN.Normal).xyz);
// store normalized light vector
float3 lightVec = normalize(LightVec.xyz);
// calculate half angle vector
float3 eyeVec = float3(0.0, 0.0, 1.0);
float3 halfVec = normalize(lightVec + eyeVec);
// calculate diffuse component
float diffuse = dot(normalVec, lightVec);
// calculate specular component
float specular = dot(normalVec, halfVec);
// The lit() function is a handy function in the standard library that
// can be used to accelerate your lighting calculations.
//
// This function return a vector containing these values:
// result.x = 1.0;
// result.y = max(diffuse, 0);
// result.z = if (result.y > 0.0) then pow(specular, 32) else 0.0
// result.w = 1.0;
// Use the lit function to compute lighting vector from diffuse and
// specular values
float4 lighting = lit(diffuse, specular, 32);
// combine diffuse and specular contributions
float3 color0 = (lighting.y * DiffuseMaterial.xyz * LightColor.xyz) +
(lighting.z * SpecularMaterial.xyz);
// Generate a pseudo-random noise pattern
// float3 xyz = clamp((normalVec.xyz + 1.0) * 0.5, 0.0, 1.0);
float3 xyz = clamp((OUT.HPosition.xyz + 1.0) * 0.5, 0.0, 1.0);
xyz = frac(xyz * 262144.0);
float randSeed = frac(3.0 * xyz.x + 5.0 * xyz.y + 7.0 * xyz.z);
float3 altColor;
randSeed = frac(37.0 * randSeed);
altColor.x = randSeed * 0.5 + 0.5;
randSeed = frac(37.0 * randSeed);
altColor.y = randSeed * 0.5 + 0.5;
randSeed = frac(37.0 * randSeed);
altColor.z = randSeed * 0.5 + 0.5;
randSeed = frac(37.0 * randSeed);
float altAlpha = randSeed * 0.5;
// Apply noise and output final vertex color
OUT.Color0.rgb = lerp(color0, altColor, altAlpha);
OUT.Color0.a = 1.0;
return OUT;
}
|
