我目前正在尝试添加阴影与阴影Map到我的3D引擎。
首先，我从光线的Angular 渲染场景，并将深度值保存在纹理中。然后，我使用defeault FBO从纹理中绘制。就像在this教程中一样。问题是，我的屏幕保持白色，无论我移动到哪里。
GL.GetError()输出noError，我在顶点着色器中使用的SSBO具有正确的值。GL.CheckFramebufferStatus()返回FramebufferCompleteExt。
这是我如何创建深度值的FBO：

_depthMapFBO = GL.GenFramebuffer();
_depthMapFBOColorBuffer = BufferObjects.FBO_TextureAttachment(_depthMapFBO, PixelInternalFormat.DepthComponent, PixelFormat.DepthComponent, FramebufferAttachment.DepthAttachment, 1024, 1024);
GL.BindFramebuffer(FramebufferTarget.Framebuffer, _depthMapFBO);
GL.DrawBuffer(DrawBufferMode.None);
GL.ReadBuffer(ReadBufferMode.None);
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public static int FBO_TextureAttachment(int FrameBuffer, PixelInternalFormat PixelInternalFormat, PixelFormat PixelFormat, FramebufferAttachment FramebufferAttachment, int Width, int Height)
{
    // PixelInternalFormat = DepthComponent && PixelFormat = DepthComponent && FramebufferAttachment = DepthAttachment && Width, Height = 1024, 
    GL.BindFramebuffer(FramebufferTarget.Framebuffer, FrameBuffer);
    int _texture = GL.GenTexture();
            
    GL.BindTexture(TextureTarget.Texture2D, _texture);
    GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat, Width, Height, 0, PixelFormat, PixelType.Float, IntPtr.Zero);
    GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.Nearest);
    GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Nearest);
    GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.Repeat);
    GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.Repeat);
    GL.FramebufferTexture2D(FramebufferTarget.Framebuffer, FramebufferAttachment, TextureTarget.Texture2D, _texture, 0);
    return _texture;
}

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在我的渲染函数中，它看起来像这样：

GL.BindFramebuffer(FramebufferTarget.Framebuffer, _depthMapFBO);
GL.Clear(ClearBufferMask.DepthBufferBit);
GL.Viewport(0, 0, 1024, 1024);
_simpleDepthProgram.Use();
float _nearPlane = 1.0f, _farPlane = 100f;
_lightProjection = Matrix4.CreateOrthographicOffCenter(-100.0f, 100.0f, -100.0f, 100.0f, _nearPlane, _farPlane);
_ligthView = Matrix4.LookAt(_allLamps[0].Position, new Vector3(0f), new Vector3(0.0f, 1.0f, 0.0f));
_lightSpaceMatrix = _lightProjection * _ligthView;
GL.UniformMatrix4(21, false, ref _lightSpaceMatrix);
// Copy all SSBO's 
GL.ActiveTexture(TextureUnit.Texture2);
GL.BindTexture(TextureTarget.Texture2D, _depthMapFBOColorBuffer);
Scene();

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以及绘制depthMap的着色器：

#version 450 core
out vec4 FragColor;
uniform sampler2D scene;
uniform sampler2D bloomed;
uniform sampler2D depthMap;
uniform float zNear;
uniform float zFar;
float LinearizeDepth(float depth)
{
    float z = depth * 2.0 - 1.0; // Back to NDC 
    return (2.0 * zNear * zFar) / (zFar + zNear - z * (zFar - zNear));  
}
in vec2 TexCoord;
void main()
{ 
    float depthValue = texture(depthMap, TexCoord).r;
    //float depth = LinearizeDepth(gl_FragCoord.z) / far; // only for perspective 
    FragColor = vec4(vec3(depthValue), 1.0);
}

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