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116 lines
3.6 KiB
Text
116 lines
3.6 KiB
Text
// Vertex program for fresnel reflections / refractions
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void main_vp(
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float4 pos : POSITION,
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float4 normal : NORMAL,
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float2 tex : TEXCOORD0,
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out float4 oPos : POSITION,
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out float3 noiseCoord : TEXCOORD0,
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out float4 projectionCoord : TEXCOORD1,
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out float3 oEyeDir : TEXCOORD2,
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out float3 oNormal : TEXCOORD3,
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uniform float4x4 worldViewProjMatrix,
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uniform float3 eyePosition, // object space
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uniform float timeVal,
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uniform float scale, // the amount to scale the noise texture by
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uniform float scroll, // the amount by which to scroll the noise
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uniform float noise // the noise perturb as a factor of the time
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)
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{
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oPos = mul(worldViewProjMatrix, pos);
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// Projective texture coordinates, adjust for mapping
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float4x4 scalemat = float4x4(0.5, 0, 0, 0.5,
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0,-0.5, 0, 0.5,
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0, 0, 0.5, 0.5,
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0, 0, 0, 1);
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projectionCoord = mul(scalemat, oPos);
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// Noise map coords
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noiseCoord.xy = (tex + (timeVal * scroll)) * scale;
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noiseCoord.z = noise * timeVal;
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oEyeDir = normalize(pos.xyz - eyePosition);
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oNormal = normal.rgb;
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}
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// Fragment program for distorting a texture using a 3D noise texture
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void main_fp(
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float3 noiseCoord : TEXCOORD0,
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float4 projectionCoord : TEXCOORD1,
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float3 eyeDir : TEXCOORD2,
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float3 normal : TEXCOORD3,
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out float4 col : COLOR,
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uniform float4 tintColour,
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uniform float noiseScale,
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uniform float fresnelBias,
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uniform float fresnelScale,
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uniform float fresnelPower,
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uniform sampler2D waterTex : register(s0),
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uniform sampler2D noiseMap : register(s1),
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uniform sampler2D reflectMap : register(s2),
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uniform sampler2D refractMap : register(s3)
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)
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{
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// Do the tex projection manually so we can distort _after_
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float2 final = projectionCoord.xy / projectionCoord.w;
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// Noise
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float3 noiseNormal = (tex2D(noiseMap, (noiseCoord.xy / 5)).rgb - 0.5).rbg * noiseScale;
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final += noiseNormal.xz;
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// Fresnel
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//normal = normalize(normal + noiseNormal.xz);
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float fresnel = fresnelBias + fresnelScale * pow(1 + dot(eyeDir, normal), fresnelPower);
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// Reflection / refraction
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float4 reflectionColour = tex2D(reflectMap, final);
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float4 refractionColour = tex2D(refractMap, final) + tintColour;
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// Final colour
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col = lerp(refractionColour, reflectionColour, fresnel) * tex2D(waterTex, noiseNormal) / 3 ;
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}
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// Old version to match ATI PS 1.3 implementation
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void main_vp_old(
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float4 pos : POSITION,
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float4 normal : NORMAL,
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float2 tex : TEXCOORD0,
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out float4 oPos : POSITION,
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out float fresnel : COLOR,
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out float3 noiseCoord : TEXCOORD0,
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out float4 projectionCoord : TEXCOORD1,
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uniform float4x4 worldViewProjMatrix,
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uniform float3 eyePosition, // object space
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uniform float fresnelBias,
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uniform float fresnelScale,
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uniform float fresnelPower,
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uniform float timeVal,
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uniform float scale, // the amount to scale the noise texture by
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uniform float scroll, // the amount by which to scroll the noise
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uniform float noise // the noise perturb as a factor of the time
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)
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{
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oPos = mul(worldViewProjMatrix, pos);
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// Projective texture coordinates, adjust for mapping
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float4x4 scalemat = float4x4(0.5, 0, 0, 0.5,
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0,-0.5, 0, 0.5,
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0, 0, 0.5, 0.5,
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0, 0, 0, 1);
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projectionCoord = mul(scalemat, oPos);
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// Noise map coords
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noiseCoord.xy = (tex + (timeVal * scroll)) * scale;
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noiseCoord.z = noise * timeVal;
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// calc fresnel factor (reflection coefficient)
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float3 eyeDir = normalize(pos.xyz - eyePosition);
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fresnel = fresnelBias + fresnelScale * pow(1 + dot(eyeDir, normal), fresnelPower);
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}
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