Webgl:替代编写gl_FragDepth [英] Webgl: alternative to writing to gl_FragDepth
问题描述
在WebGL中,是否可以写入片段的深度值或以其他方式控制片段的深度值?
In WebGL, is it possible to write to the fragment's depth value or control the fragment's depth value in some other way?
据我所知,webgl 1.x中没有gl_FragDepth,但是我想知道是否还有其他方法(扩展,特定于浏览器的支持等)来实现.
As far as I could find, gl_FragDepth is not present in webgl 1.x, but I am wondering if there is any other way (extensions, browser specific support, etc) to do it.
我要存档的是使光线跟踪的对象与使用常规模型,视图,投影绘制的其他元素一起播放.
What I want to archive is to have a ray traced object play along with other elements drawn using the usual model, view, projection.
推荐答案
有扩展名 EXT_frag_depth
由于它是扩展名,因此可能并非在所有地方都可用,因此您需要检查它是否存在.
Because it's an extension it might not be available everywhere so you need to check it exists.
var isFragDepthAvailable = gl.getExtension("EXT_frag_depth");
如果isFragDepthAvailable
不为假,则可以使用
在着色器中启用它
If isFragDepthAvailable
is not falsey then you can enable it in your shaders with
#extension GL_EXT_frag_depth : enable
否则,您可以在顶点着色器中操纵gl_Position.z
,尽管我怀疑这并不是满足大多数需求的可行解决方案.
Otherwise you can manipulate gl_Position.z
in your vertex shader though I suspect that's not really a viable solution for most needs.
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