如何修正OpenGL中的“错误0:60样本不能是结构或块成员”？

Question

在运行代码时，我得到错误"samplers不能是结构或块成员“。

我发现这是因为我的硬件不允许这样做：

struct Material
{
    sampler2D diffuse;
    sampler2D specular;
    float shininess;
};

我的直接解决方案是将两个sampler2D对象声明为“统一”。

uniform sampler2D Mdiffuse;
uniform sampler2D Mspecular;

然后将使用对象的每一行更改为它们的新名称(而不是material.diffuse和material.specular)。虽然这确实删除了错误，但仍未绘制对象。

这是完整的片段着色器，如果它是必要的(原始的，没有我的改变)。

#version 330 core

#define NUMBER_OF_POINT_LIGHTS 4

struct Material
{
    sampler2D diffuse;
    sampler2D specular;
    float shininess;
};

struct DirLight
{
    vec3 direction;
    
    vec3 ambient;
    vec3 diffuse;
    vec3 specular;
};

struct PointLight
{
    vec3 position;
    
    float constant;
    float linear;
    float quadratic;
    
    vec3 ambient;
    vec3 diffuse;
    vec3 specular;
};

struct SpotLight
{
    vec3 position;
    vec3 direction;
    float cutOff;
    float outerCutOff;
    
    float constant;
    float linear;
    float quadratic;
    
    vec3 ambient;
    vec3 diffuse;
    vec3 specular;
};

in vec3 FragPos;
in vec3 Normal;
in vec2 TexCoords;

out vec4 color;

uniform vec3 viewPos;
uniform DirLight dirLight;
uniform PointLight pointLights[NUMBER_OF_POINT_LIGHTS];
uniform SpotLight spotLight;
uniform Material material;




// Function prototypes
vec3 CalcDirLight( DirLight light, vec3 normal, vec3 viewDir );
vec3 CalcPointLight( PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir );
vec3 CalcSpotLight( SpotLight light, vec3 normal, vec3 fragPos, vec3 viewDir );

void main( )
{
    // Properties
    vec3 norm = normalize( Normal );
    vec3 viewDir = normalize( viewPos - FragPos );
    
    // Directional lighting
    vec3 result = CalcDirLight( dirLight, norm, viewDir );
    
    // Point lights
    for ( int i = 0; i < NUMBER_OF_POINT_LIGHTS; i++ )
    {
        result += CalcPointLight( pointLights[i], norm, FragPos, viewDir );
    }
    
    // Spot light
    result += CalcSpotLight( spotLight, norm, FragPos, viewDir );
    
    
    /*color = vec4( result,texture( material.diffuse, TexCoords).a );
      if(color.a < 0.1)
        discard;*/
}

// Calculates the color when using a directional light.
vec3 CalcDirLight( DirLight light, vec3 normal, vec3 viewDir )
{
    vec3 lightDir = normalize( -light.direction );
    
    // Diffuse shading
    float diff = max( dot( normal, lightDir ), 0.0 );
    
    // Specular shading
    vec3 reflectDir = reflect( -lightDir, normal );
    float spec = pow( max( dot( viewDir, reflectDir ), 0.0 ), material.shininess );
    
    // Combine results
    vec3 ambient = light.ambient * vec3( texture( material.diffuse, TexCoords ).rgb );
    vec3 diffuse = light.diffuse * diff * vec3( texture( material.diffuse, TexCoords ).rgb );
    vec3 specular = light.specular * spec * vec3( texture( material.specular, TexCoords ).rgb );

    
    /*vec4 result= vec4(ambient + diffuse + specular,texture( material.diffuse, TexCoords).a) ;
      if(result.a < 0.1)
        discard;*/
            vec3 result=ambient + diffuse + specular;

    return (result);
}

// Calculates the color when using a point light.
vec3 CalcPointLight( PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir )
{
    vec3 lightDir = normalize( light.position - fragPos );
    
    // Diffuse shading
    float diff = max( dot( normal, lightDir ), 0.0 );
    
    // Specular shading
    vec3 reflectDir = reflect( -lightDir, normal );
    float spec = pow( max( dot( viewDir, reflectDir ), 0.0 ), material.shininess );
    
    // Attenuation
    float distance = length( light.position - fragPos );
    float attenuation = 1.0f / ( light.constant + light.linear * distance + light.quadratic * ( distance * distance ) );
    
    // Combine results
    vec3 ambient = light.ambient * vec3( texture( material.diffuse, TexCoords ).rgb );
    vec3 diffuse = light.diffuse * diff * vec3( texture( material.diffuse, TexCoords ).rgb );
    vec3 specular = light.specular * spec * vec3( texture( material.specular, TexCoords ).rgb );

    
    ambient *= attenuation;
    diffuse *= attenuation;
    specular *= attenuation;

  /* vec4 result= vec4(ambient + diffuse + specular,texture( material.diffuse, TexCoords).a) ;
      if(result.a < 0.1)
        discard;*/
        vec3 result=ambient + diffuse + specular;

    return (result);
    
}

// Calculates the color when using a spot light.
vec3 CalcSpotLight( SpotLight light, vec3 normal, vec3 fragPos, vec3 viewDir )
{
    vec3 lightDir = normalize( light.position - fragPos );
    
    // Diffuse shading
    float diff = max( dot( normal, lightDir ), 0.0 );
    
    // Specular shading
    vec3 reflectDir = reflect( -lightDir, normal );
    float spec = pow( max( dot( viewDir, reflectDir ), 0.0 ), material.shininess );
    
    // Attenuation
    float distance = length( light.position - fragPos );
    float attenuation = 1.0f / ( light.constant + light.linear * distance + light.quadratic * ( distance * distance ) );
    
    // Spotlight intensity
    float theta = dot( lightDir, normalize( -light.direction ) );
    float epsilon = light.cutOff - light.outerCutOff;
    float intensity = clamp( ( theta - light.outerCutOff ) / epsilon, 0.0, 1.0 );
    
    // Combine results
    vec3 ambient = light.ambient * vec3( texture( material.diffuse, TexCoords ).rgb );
    vec3 diffuse = light.diffuse * diff * vec3( texture( material.diffuse, TexCoords ).rgb );
    vec3 specular = light.specular * spec * vec3( texture( material.specular, TexCoords ).rgb );

    
    ambient *= attenuation * intensity;
    diffuse *= attenuation * intensity;
    specular *= attenuation * intensity;

    /*  vec4 result= vec4(ambient + diffuse + specular,texture( material.diffuse, TexCoords).a) ;
      if(result.a < 0.1)
        discard;*/

        vec3 result=ambient + diffuse + specular;

    return (result);
    
}

Answer 1

检查一下，如果你用硬编码的颜色代替纹理的用法( that /MSpecular)，那么就会发现一些东西。如果是这样的话，检查您正在加载和绑定纹理正确之前，您的抽签调用。