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27 lines
941 B
GLSL
27 lines
941 B
GLSL
#include "core.h"
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#include "watersim_common.h"
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SH_BEGIN_PROGRAM
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shInput(float2, UV)
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shSampler2D(heightCurrentSampler)
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shUniform(float4, rippleTextureSize) @shSharedParameter(rippleTextureSize, rippleTextureSize)
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SH_START_PROGRAM
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{
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float2 offset[4] = float2[4] (
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vec2(-1.0, 0.0),
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vec2( 1.0, 0.0),
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vec2( 0.0,-1.0),
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vec2( 0.0, 1.0)
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);
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float fHeightL = DecodeHeightmap(heightCurrentSampler, UV.xy + offset[0]*rippleTextureSize.xy);
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float fHeightR = DecodeHeightmap(heightCurrentSampler, UV.xy + offset[1]*rippleTextureSize.xy);
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float fHeightT = DecodeHeightmap(heightCurrentSampler, UV.xy + offset[2]*rippleTextureSize.xy);
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float fHeightB = DecodeHeightmap(heightCurrentSampler, UV.xy + offset[3]*rippleTextureSize.xy);
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float3 n = float3(fHeightB - fHeightT, fHeightR - fHeightL, 1.0);
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float3 normal = (n + 1.0) * 0.5;
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shOutputColour(0) = float4(normal.rgb, 1.0);
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}
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