unity amplify shader editor custom expression 自定义贴图 ...

maltadirk · 发表于 2022-10-27 16:35

定义 hlsl 文件

#ifndef GAUSSIAN_BLUR_INCLUDE
#define GAUSSIAN_BLUR_INCLUDE

#define MAX_PARAMS_LENGHT 3

// 0.25, 0.5, 0.25
static const float gaussianCoreParams3[MAX_PARAMS_LENGHT] = {0.5, 0.25, 0};
static const int gaussianCoreParams3_Length = 2;

// 0.06542056, 0.2429907, 0.3831776, 0.2429907, 0.06542056
static const float gaussianCoreParams5[MAX_PARAMS_LENGHT] = {0.3831776, 0.2429907, 0.06542056};
static const int gaussianCoreParams5_Length = 3;

float4 GaussianSampleLine_Common(sampler2D tex, float2 uv, float2 uv_delta,
const float params[MAX_PARAMS_LENGHT], const int params_length)
{
float4 result = (float4)0;
result += tex2D(tex, uv) * params[0];
for (int i=1; i<params_length; i++)
{
      result += tex2D(tex, uv + uv_delta*i) * params;
      result += tex2D(tex, uv - uv_delta*i) * params;
}
return result;
}

float4 GaussianBlur_Common(sampler2D tex, float2 uv, float2 uv_delta,
const float params[MAX_PARAMS_LENGHT], const int params_length)
{
float4 result = (float4)0;
float2 delta_U = float2(uv_delta.x, 0);
float2 delta_V = float2(0, uv_delta.y);
result += GaussianSampleLine_Common(tex, uv, delta_U, params, params_length) * gaussianCoreParams3[0];
for (int i=1; i<gaussianCoreParams3_Length; i++)
{
      result += GaussianSampleLine_Common(tex, uv + delta_V*i, delta_U, params, params_length) * gaussianCoreParams3;
      result += GaussianSampleLine_Common(tex, uv - delta_V*i, delta_U, params, params_length) * gaussianCoreParams3;
}
return result;
}

float4 GaussianSampleLine_3(sampler2D tex, float2 uv, float2 uv_delta)
{
return GaussianSampleLine_Common(tex, uv, uv_delta, gaussianCoreParams3, gaussianCoreParams3_Length);
}

float4 GaussianBlur_3x3(sampler2D tex, float2 uv, float2 uv_delta)
{
return GaussianBlur_Common(tex, uv, uv_delta, gaussianCoreParams3, gaussianCoreParams3_Length);
}

float4 GaussianSampleLine_5(sampler2D tex, float2 uv, float2 uv_delta)
{
return GaussianSampleLine_Common(tex, uv, uv_delta, gaussianCoreParams5, gaussianCoreParams5_Length);
}

float4 GaussianBlur_5x5(sampler2D tex, float2 uv, float2 uv_delta)
{
return GaussianBlur_Common(tex, uv, uv_delta, gaussianCoreParams5, gaussianCoreParams5_Length);
}

#endif配置 ase custom expression 节点

使用 File 模式

引用刚刚的 hlsl 文件

节点改模板函数同名

节点输入输出配置函数输入输出变量一致

关于编译后 GLES android 平台的shader

循环展开了

全局变量高斯模糊变成 12 次立即数，（每行3次，混合3行再3次，3*3+3 = 12）

a 分量计算被编译器优化掉了

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unity amplify shader editor custom expression 自定义贴图 ...

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