unity amplify shader editor custom expression 自定义贴图 ...
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 = {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 = {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, const int params_length)
{
float4 result = (float4)0;
result += tex2D(tex, uv) * params;
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, 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;
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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