我要评论看到网上有用unity做的桌面小宠物，就自己搜了些资料自己做了一个小demo。
核心功能实现
简单说一下思路，有一个脚本跟一个shader，通过脚本和shader负责将unity运行时的背景调成透明色。这个是通过调颜色来进行了。具体原理也不清楚，查了查资料大概是这样
窗口透明化与无边框
- 通过windows api调用
setwindowlong和dwmextendframeintoclientarea实现透明背景和隐藏边框，需在相机设置中将clear flags设为solid color且透明度为01。 - 注意：背景色需与模型边缘颜色相近以避免毛边（如0x00bgr格式的colorref值）2。
- 通过windows api调用
交互逻辑
- 点击穿透：通过检测鼠标坐标与模型碰撞器实现交互（如点击播放挠痒动画）15。
- 拖拽限制：动态计算模型碰撞器与屏幕边缘距离，使用
mathf.clamp限制移动范围2。
代码部分
shader
shader "custom/maketransparent" {
properties {
_maintex ("base (rgb)", 2d) = "white" {}
_transparentcolorkey ("transparent color key", color) = (0,1,0,1)
_transparencymargin ("transparency margin", float) = 0.01
}
subshader {
pass {
tags { "rendertype"="opaque" }
lod 200
cgprogram
#pragma vertex vertexshaderfunction
#pragma fragment pixelshaderfunction
#include "unitycg.cginc"
struct vertexdata
{
float4 position : position;
float2 uv : texcoord0;
};
struct vertextopixeldata
{
float4 position : sv_position;
float2 uv : texcoord0;
};
vertextopixeldata vertexshaderfunction(vertexdata input)
{
vertextopixeldata output;
output.position = unityobjecttoclippos (input.position);
output.uv = input.uv;
return output;
}
sampler2d _maintex;
float3 _transparentcolorkey;
float _transparencymargin;
float4 pixelshaderfunction(vertextopixeldata input) : sv_target
{
float4 color = tex2d(_maintex, input.uv);
float deltar = abs(color.r - _transparentcolorkey.r);
float deltag = abs(color.g - _transparentcolorkey.g);
float deltab = abs(color.b - _transparentcolorkey.b);
if (deltar < _transparencymargin && deltag < _transparencymargin && deltab < _transparencymargin)
{
return float4(0.0f, 0.0f, 0.0f, 0.0f);
}
return color;
}
endcg
}
}
}
c#
using system;
using system.runtime.interopservices;
using unityengine;
public class transparentwindow : monobehaviour
{
[serializefield] private material m_material;
private struct margins
{
public int cxleftwidth;
public int cxrightwidth;
public int cytopheight;
public int cybottomheight;
}
[dllimport("user32.dll")]
private static extern intptr getactivewindow();
[dllimport("user32.dll")]
private static extern int setwindowlong(intptr hwnd, int nindex, uint dwnewlong);
[dllimport("dwmapi.dll")]
private static extern uint dwmextendframeintoclientarea(intptr hwnd, ref margins margins);
[dllimport("user32.dll", entrypoint = "setwindowpos")]
private static extern int setwindowpos(intptr hwnd, intptr hwndinsertafter, int x, int y, int cx, int cy,
int uflags);
[dllimport("user32.dll")]
static extern bool showwindowasync(intptr hwnd, int ncmdshow);
[dllimport("user32.dll", entrypoint = "setlayeredwindowattributes")]
static extern int setlayeredwindowattributes(intptr hwnd, int crkey, byte balpha, int dwflags);
[dllimport("user32.dll")]
private static extern bool setforegroundwindow(intptr hwnd);
const int gwl_style = -16;
const int gwl_exstyle = -20;
const uint ws_popup = 0x80000000;
const uint ws_visible = 0x10000000;
const uint ws_ex_topmost = 0x00000008;
const uint ws_ex_layered = 0x00080000;
const uint ws_ex_transparent = 0x00000020;
const int swp_framechanged = 0x0020;
const int swp_showwindow = 0x0040;
const int lwa_alpha = 2;
private intptr hwnd_topmost = new intptr(-1);
private intptr _hwnd;
void start()
{
#if !unity_editor
margins margins = new margins() { cxleftwidth = -1 };
_hwnd = getactivewindow();
int fwidth = screen.width;
int fheight = screen.height;
setwindowlong(_hwnd, gwl_style, ws_popup | ws_visible);
//setwindowlong(_hwnd, gwl_exstyle, ws_ex_topmost | ws_ex_layered | ws_ex_transparent);//若想鼠标穿透，则将这个注释恢复即可
dwmextendframeintoclientarea(_hwnd, ref margins);
setwindowpos(_hwnd, hwnd_topmost, 0, 0, fwidth, fheight, swp_framechanged | swp_showwindow);
showwindowasync(_hwnd, 3); //forces window to show in case of unresponsive app // sw_showmaximized(3)
#endif
}
void onrenderimage(rendertexture from, rendertexture to)
{
graphics.blit(from, to, m_material);
}
}
具体步骤
1.新建一个material(材质球),选择刚建立的shader:
2.将刚写的c#脚本挂在摄像机上，摄像机的clear flags模式选择solod color，并将刚建立的材质球挂在脚本上。
3.摄像机的background属性要和材质球的transparent color key属性一致：
4.这里要注意一个点，unity19以上的版本需要设置一个东西。在playersetting中将这个usedxgiflipmodelswapchainford3d11取消勾选。
这样就可以实现窗口透明了，然后在场景里加一个模型跟动作就好啦
总结
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