Here is the shader code:
Pixel
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struct v2f {
float4 Position : POSITION; // in clip space
float3 rotMatrix1 : TEXCOORD0; // first row of the 3x3 transform from tangent to obj space
float3 rotMatrix2 : TEXCOORD1; // second row of the 3x3 transform from tangent to obj space
float3 rotMatrix3 : TEXCOORD2; // third row of the 3x3 transform from tangent to obj space
float2 bumpCoord0 : TEXCOORD3;
float2 bumpCoord1 : TEXCOORD4;
float2 bumpCoord2 : TEXCOORD5;
float3 eyeVector : TEXCOORD6;
};
float4 main(v2f IN,
uniform sampler2D NormalMap,
uniform samplerCUBE EnvironmentMap,
uniform float4 deepColor,
uniform float4 shallowColor,
uniform float4 reflectionColor,
uniform float reflectionAmount,
uniform float reflectionBlur,
uniform float waterAmount,
uniform float fresnelPower,
uniform float fresnelBias,
uniform float hdrMultiplier
) : COLOR
{
// sum normal maps
// sample from 3 different points so no texture repetition is noticeable
float4 t0 = tex2D(NormalMap, IN.bumpCoord0) * 2.0 - 1.0;
float4 t1 = tex2D(NormalMap, IN.bumpCoord1) * 2.0 - 1.0;
float4 t2 = tex2D(NormalMap, IN.bumpCoord2) * 2.0 - 1.0;
float3 N = t0.xyz + t1.xyz + t2.xyz;
float3x3 m; // tangent to world matrix
m[0] = IN.rotMatrix1;
m[1] = IN.rotMatrix2;
m[2] = IN.rotMatrix3;
N = normalize( mul( N, m ) );
// reflection
float3 E = normalize(IN.eyeVector);
float4 R;
R.xyz = reflect(E, N);
// Ogre conversion for cube map lookup
R.z = -R.z;
R.w = reflectionBlur;
float4 reflection = texCUBEbias(EnvironmentMap, R);
// cheap hdr effect
reflection.rgb *= (reflection.r + reflection.g + reflection.b) * hdrMultiplier;
// fresnel
float facing = 1.0 - max(dot(-E, N), 0);
float fresnel = saturate(fresnelBias + pow(facing, fresnelPower));
float4 waterColor = lerp(shallowColor, deepColor, facing) * waterAmount;
reflection = lerp(waterColor, reflection * reflectionColor, fresnel) * reflectionAmount;
return waterColor + reflection;
}
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/*********************************************************************NVMH3****
Copyright NVIDIA Corporation 2003
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 ocean shader with animated bump map and geometric waves
Based partly on "Effective Water Simulation From Physical Models", GPU Gems
11 Aug 05: heavily modified by Jeff Doyle (nfz) for Ogre
******************************************************************************/
struct a2v {
float4 Position : POSITION; // in object space
float2 TexCoord : TEXCOORD0;
};
struct v2f {
float4 Position : POSITION; // in clip space
float3 rotMatrix1 : TEXCOORD0; // first row of the 3x3 transform from tangent to obj space
float3 rotMatrix2 : TEXCOORD1; // second row of the 3x3 transform from tangent to obj space
float3 rotMatrix3 : TEXCOORD2; // third row of the 3x3 transform from tangent to obj space
float2 bumpCoord0 : TEXCOORD3;
float2 bumpCoord1 : TEXCOORD4;
float2 bumpCoord2 : TEXCOORD5;
float3 eyeVector : TEXCOORD6;
};
// wave functions
struct Wave {
float freq; // 2*PI / wavelength
float amp; // amplitude
float phase; // speed * 2*PI / wavelength
float2 dir;
};
float4 main(a2v IN,
uniform float4x4 WorldViewProj,
uniform float3 eyePosition,
uniform float BumpScale,
uniform float2 textureScale,
uniform float2 bumpSpeed,
uniform float time,
uniform float waveFreq,
uniform float waveAmp
) : POSITION
{
v2f OUT;
#define NWAVES 2
Wave wave[NWAVES] = {
{ 1.0, 1.0, 0.5, float2(-1, 0) },
{ 2.0, 0.5, 1.7, float2(-0.7, 0.7) }
};
wave[0].freq = waveFreq;
wave[0].amp = waveAmp;
wave[1].freq = waveFreq * 3.0;
wave[1].amp = waveAmp * 0.33;
float4 P = IN.Position;
// sum waves
float ddx = 0.0, ddy = 0.0;
float deriv;
float angle;
// wave synthesis using two sine waves at different frequencies and phase shift
for(int i = 0; i<NWAVES; ++i)
{
angle = dot(wave[i].dir, P.xz) * wave[i].freq + time * wave[i].phase;
P.y += wave[i].amp * sin( angle );
// calculate derivate of wave function
deriv = wave[i].freq * wave[i].amp * cos(angle);
ddx -= deriv * wave[i].dir.x;
ddy -= deriv * wave[i].dir.y;
}
// compute the 3x3 tranform from tangent space to object space
// first rows are the tangent and binormal scaled by the bump scale
OUT.rotMatrix1.xyz = BumpScale * normalize(float3(1, ddy, 0)); // Binormal
OUT.rotMatrix2.xyz = BumpScale * normalize(float3(0, ddx, 1)); // Tangent
OUT.rotMatrix3.xyz = normalize(float3(ddx, 1, ddy)); // Normal
OUT.Position = mul(WorldViewProj, P);
// calculate texture coordinates for normal map lookup
OUT.bumpCoord0.xy = IN.TexCoord*textureScale + time * bumpSpeed;
OUT.bumpCoord1.xy = IN.TexCoord*textureScale * 2.0 + time * bumpSpeed * 4.0;
OUT.bumpCoord2.xy = IN.TexCoord*textureScale * 4.0 + time * bumpSpeed * 8.0;
OUT.eyeVector = P.xyz - eyePosition; // eye position in vertex space
return OUT.Position;
}
