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optimize water simulation for PowerVR hardware

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XProger
2019-01-17 22:46:59 +03:00
parent 978f029bec
commit a622aa3ff2
1 changed files with 39 additions and 38 deletions
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77
src/shaders/water_simulate.hlsl
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@@ -1,63 +1,64 @@
#include "common.hlsl"
struct VS_OUTPUT {
float4 pos : POSITION;
float2 texCoord : TEXCOORD0;
float2 maskCoord : TEXCOORD1;
float4 pos : POSITION;
half2 texCoord : TEXCOORD0;
half2 maskCoord : TEXCOORD1;
half2 texCoordL : TEXCOORD2;
half2 texCoordR : TEXCOORD3;
half2 texCoordT : TEXCOORD4;
half2 texCoordB : TEXCOORD5;
half2 noiseCoord : TEXCOORD6;
};
float2 getInvUV(float2 uv, float4 param) {
float2 p = (float2(uv.x, -uv.y) * 0.5 + 0.5) * param.zw;
#ifndef _GAPI_GXM
p.xy += 0.5 * param.xy;
#endif
return p;
}
float2 getUV(float2 uv, float4 param) {
return (uv.xy * 0.5 + 0.5) * param.zw;
}
#ifdef VERTEX
VS_OUTPUT main(VS_INPUT In) {
VS_OUTPUT Out;
float3 coord = In.aCoord.xyz * (1.0 / 32767.0);
float4 uv = float4(coord.x, coord.y, coord.x, -coord.y) * 0.5 + 0.5;
Out.pos = float4(coord.xyz, 1.0);
Out.texCoord = getInvUV(coord.xy, uTexParam);
Out.maskCoord = getUV(coord.xy, uRoomSize);
Out.maskCoord = uv.xy * uRoomSize.zw;
Out.texCoord = uv.zw * uTexParam.zw;
#ifndef _GAPI_GXM
Out.texCoord += 0.5 * uTexParam.xy;
#endif
float3 d = float3(uTexParam.x, uTexParam.y, 0.0);
Out.texCoordL = Out.texCoord - d.xz;
Out.texCoordR = Out.texCoord + d.xz;
Out.texCoordT = Out.texCoord - d.zy;
Out.texCoordB = Out.texCoord + d.zy;
Out.noiseCoord = Out.texCoord + uParam.zw;
return Out;
}
#else // PIXEL
#define WATER_VEL 1.4
#define WATER_VIS 0.995
half4 main(VS_OUTPUT In) : COLOR0 {
float2 uv = In.texCoord.xy;
if (tex2Dlod(sMask, float4(In.maskCoord, 0, 0)).a < 0.5)
return 0.0;
half4 v = tex2D(sNormal, In.texCoord.xy); // height, speed
half2 v = (half2)tex2Dlod(sNormal, float4(uv, 0, 0)).xy; // height, speed
float3 d = float3(float2(uTexParam.x, -uTexParam.y), 0.0);
float4 f = float4(
F2_TEX2D(sNormal, uv + d.xz).x, F2_TEX2D(sNormal, uv + d.zy).x,
F2_TEX2D(sNormal, uv - d.xz).x, F2_TEX2D(sNormal, uv - d.zy).x
);
float average = dot(f, (float4)0.25);
// integrate
const half vel = 1.4;
const half vis = 0.995;
v.y += (half)((average - v.x) * vel);
v.y *= vis;
v.x += v.y + (half)(tex2Dlod(sDiffuse, float4(uv + uParam.zw, 0, 0)).x * 2.0 - 1.0) * 0.00025;
half average = (
tex2D(sNormal, In.texCoordL).x +
tex2D(sNormal, In.texCoordR).x +
tex2D(sNormal, In.texCoordT).x +
tex2D(sNormal, In.texCoordB).x) * 0.25;
return half4(v, 0, 0);
// integrate
v.y += (average - v.x) * WATER_VEL;
v.y *= WATER_VIS;
v.x += v.y;
v.x += tex2D(sDiffuse, In.noiseCoord).x * 0.00025;
v *= tex2D(sMask, In.maskCoord).a;
return v;
}
#endif