void OnRenderImage(RenderTexture source, RenderTexture destination)
{
if (CMainMaterial)
{
// 申请两块降低了分辨率的RT
RenderTexture rt1 = RenderTexture.GetTemporary(source.width >> down_sample_factor, source.height >> down_sample_factor, 0, source.format);
RenderTexture rt2 = RenderTexture.GetTemporary(source.width >> down_sample_factor, source.height >> down_sample_factor, 0, source.format);
Graphics.Blit(source, rt1);
// 使用降低分辨率的rt进行模糊:pass0
CMainMaterial.SetFloat("_BlurFactor", blur_factor);
CMainMaterial.SetVector("_BlurCenter", blur_center);
Graphics.Blit(rt1, rt2, CMainMaterial, 0);
// 使用rt2和原始图像lerp:pass1
CMainMaterial.SetTexture("_BlurTex", rt2);
CMainMaterial.SetFloat("_LerpFactor", lerp_factor);
Graphics.Blit(source, destination, CMainMaterial, 1);
// 释放RT
RenderTexture.ReleaseTemporary(rt1);
RenderTexture.ReleaseTemporary(rt2);
}
else
{
Graphics.Blit(source, destination);
}
}
void OnRenderImage(RenderTexture source, RenderTexture destination)
{
if (CMainMaterial)
{
//申请RenderTexture，RT的分辨率按照downSample降低
RenderTexture rt1 = RenderTexture.GetTemporary(source.width >> downSample, source.height >> downSample, 0, source.format);
RenderTexture rt2 = RenderTexture.GetTemporary(source.width >> downSample, source.height >> downSample, 0, source.format);
//直接将原图拷贝到降分辨率的RT上
Graphics.Blit(source, rt1);
//进行迭代高斯模糊
for (int i = 0; i < iteration; i++)
{
//第一次高斯模糊，设置offsets，竖向模糊
CMainMaterial.SetVector("_offsets", new Vector4(0, BlurRadius, 0, 0));
Graphics.Blit(rt1, rt2, CMainMaterial);
//第二次高斯模糊，设置offsets，横向模糊
CMainMaterial.SetVector("_offsets", new Vector4(BlurRadius, 0, 0, 0));
Graphics.Blit(rt2, rt1, CMainMaterial);
}
//将结果输出
Graphics.Blit(rt1, destination);
//释放申请的两块RenderBuffer内容
RenderTexture.ReleaseTemporary(rt1);
RenderTexture.ReleaseTemporary(rt2);
}
}
void OnRenderImage(RenderTexture source, RenderTexture destination)
{
if (CMainMaterial)
{
CMainMaterial.SetFloat("_BlurFactor", blur_factor);
CMainMaterial.SetVector("_BlurCenter", blur_center);
Graphics.Blit(source, destination, CMainMaterial);
}
else
{
Graphics.Blit(source, destination);
}
}
public float saturation = 1.0f; //饱和度
//覆写OnRenderImage函数
void OnRenderImage(RenderTexture src, RenderTexture dest)
{
//仅仅当有材质的时候才进行后处理，如果_Material为空，不进行后处理
if (CMainMaterial)
{
//通过Material.SetXXX（"name",value）可以设置shader中的参数值
CMainMaterial.SetFloat("_Brightness", brightness);
CMainMaterial.SetFloat("_Saturation", saturation);
CMainMaterial.SetFloat("_Contrast", contrast);
//使用Material处理Texture，dest不一定是屏幕，后处理效果可以叠加的！
Graphics.Blit(src, dest, CMainMaterial);
}
else
{
//直接绘制
Graphics.Blit(src, dest);
}
}