gl_FragDepth计算到摄影机空间

Question

深度碎片着色器是A.frag

#version 430 core
uniform float pointSize;
uniform mat4 projectMatrix;
in vec3 eyeSpacePos;
void main(){    
vec3 normal;
normal.xy = gl_PointCoord.xy * vec2(2.0, -2.0) + vec2(-1.0,1.0);
float mag = dot(normal.xy, normal.xy);
if(mag > 1.0) discard;
normal.z = sqrt(1.0 - mag);
vec4 pixelEyePos = vec4(eyeSpacePos + normal * pointSize, 1.0f);
vec4 pixelClipPos = projectMatrix * pixelEyePos;
float ndcZ = pixelClipPos.z / pixelClipPos.w;
gl_FragDepth = ndcZ;
}

接受深度图着色器为B.frag

void main(){
float pixelDepth = texture(u_DepthTex, Texcoord).r;
gl_FragDepth = outDepth;
}

如何将像素深度转换为B.frag的相机空间？我试了很多次都没有成功。

Answer 1

ndc坐标在[-1.0，1.0]范围内深度必须在dept范围内，默认情况下为[0.0，1.0]：

gl_FragDepth = ndcZ * 0.5 - 0.5;