这个SSDO演示的GLSL版本要求是自我冲突的吗

我试图从这里运行SSDO演示代码，但在花了几个小时寻找解决方案后，遇到了一些问题，这些问题让我更加困惑。尽管如此，现在我几乎可以肯定问题出在GLSL版本上。

注意：

• 演示使用glew和glut
• 我的环境是由Parallels Desktop支持的Windows 10 pro上的Microsoft Visual Studio Community 2019；MacBook Pro 2018

第1阶段

在对代码进行任何修改之前，我收到了一堆错误消息：

ERROR: 0:15: Invalid call of undeclared identifier 'texelFetch2D'
ERROR: 0:16: Invalid call of undeclared identifier 'texelFetch2D'
ERROR: 0:17: Invalid call of undeclared identifier 'texelFetch2D'
ERROR: 0:19: Use of undeclared identifier 'pixelPosition'
ERROR: 0:20: Use of undeclared identifier 'lightVector'
ERROR: 0:21: Use of undeclared identifier 'lightVector'
ERROR: 0:21: Use of undeclared identifier 'lightDistance'
ERROR: 0:23: Use of undeclared identifier 'pixelNormal'
ERROR: 0:24: Use of undeclared identifier 'pixelNormal'
ERROR: 0:24: Use of undeclared identifier 'pixelNormal'
ERROR: 0:25: Use of undeclared identifier 'lightDir'
ERROR: 0:25: Use of undeclared identifier 'pixelNormal'
ERROR: 0:27: Use of undeclared identifier 'cosAlpha'
ERROR: 0:27: Use of undeclared identifier 'pixelReflectance'
ERROR: 0:32: Use of undeclared identifier 'diffuseColor'
ERROR: One or more attached shaders not successfully compiled
...

其他着色器的消息也类似
相应地，上面显示的错误消息与create_direct_light_buffer.frag:有关

varying vec4 position;
varying vec3 normal;
uniform vec4 lightPosition;
uniform vec4 lightColor;
uniform sampler2D positionTexture;
uniform sampler2D normalTexture;
uniform sampler2D reflectanceTexture;

void main()
{   
vec4 pixelPosition = texelFetch2D(positionTexture, ivec2(gl_FragCoord.xy), 0);
vec4 pixelNormal = texelFetch2D(normalTexture, ivec2(gl_FragCoord.xy), 0);
vec4 pixelReflectance = texelFetch2D(reflectanceTexture, ivec2(gl_FragCoord.xy), 0);

vec3 lightVector = lightPosition.xyz - pixelPosition.xyz;       // vector to light source
float lightDistance = length(lightVector);         // distance to light source
vec3 lightDir = lightVector / lightDistance;       // normalized vector to light source
pixelNormal.w = 0.0;
pixelNormal = normalize(pixelNormal);
float cosAlpha = max(0.0, dot(lightDir.xyz, pixelNormal.xyz));

vec4 diffuseColor = vec4(cosAlpha) * pixelReflectance;
// vec4 ambientColor = vec4(0.2, 0.2, 0.2, 1.0);

// diffuseColor += ambientColor;
gl_FragColor = diffuseColor;
gl_FragColor.a = 1.0;
}

显然，我搜索了texelFetch2D，但获得的信息非常有限。然而，根据这些信息，我暂时认为用texelFetch替换它会有所帮助，根据本页，这需要不低于1.30的GLSL版本。

第2阶段

所以我在create_direct_light_buffer.frag的开头添加了#version 130，错误消息变成了：

ERROR: 0:1: '' :  version '130' is not supported
ERROR: One or more attached shaders not successfully compiled
...

然后我采纳了@flyx的建议，在main函数中添加了指定版本的

glutInitContextVersion(3, 2);
glutInitContextProfile(GLUT_CORE_PROFILE);

我开始迷路了。

第3阶段

错误消息变成：

WARNING: Could not find vertex shader attribute 'PRLGLSL_MultiTexCoord5' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'PRLGLSL_MultiTexCoord6' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'PRLGLSL_MultiTexCoord0' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'PRLGLSL_SecondaryColor' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'PRLGLSL_MultiTexCoord4' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'PRLGLSL_MultiTexCoord7' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'PRLGLSL_FogCoord' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'PRLGLSL_MultiTexCoord1' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'PRLGLSL_MultiTexCoord3' to match BindAttributeLocation request.
WARNING: Could not find vertex shader attribute 'PRLGLSL_MultiTexCoord2' to match BindAttributeLocation request.
C
ERROR: 0:2: 'varying' : syntax error: syntax error
ERROR: One or more attached shaders not successfully compiled
...

这些警告似乎与create_direct_light_buffer.frag无关，而且我找不到任何关于它们的问题和解决方案，所以我就放手了
当我试图找出varying错误时，我发现了这篇帖子，声称varying被in或out取代，因为GLSL版本1.30。

这就是标题中的冲突。

我的期望

1. 演示是否正确
2. 如果可以运行该项目，我该怎么办

由于我是OpenGL的新手，如果有人能下载源代码在他/她自己的电脑上试用并告诉我如何计算，我将不胜感激
否则，如果一些经验丰富的专家能就可能出现的问题或如何解决这个问题给我一些一般性的建议，我也会感激不尽。