glGetActiveUniform报告统一存在，但glGetUniformLocation返回-1 [英] glGetActiveUniform reports uniform exists, but glGetUniformLocation returns -1

问题描述

我有一个顶点着色器，由于某种原因，我不能得到一个制服的位置。

I have a vertex shader that for some reason I can't get the location of one of the uniforms.

我使用 glGetActiveUniform 以获得所有制服，我的制服是有（ bones [0] ）。

I use glGetActiveUniformto get all the uniforms available, and my uniform is there (bones[0]).

但是，当我调用 glGetUniformLocation（shaderProgram_，bones [0]）; ，它返回-1。

However, when I call glGetUniformLocation(shaderProgram_, "bones[0]");, it returns -1.

我也尝试过 glGetUniformLocation（shaderProgram_，bones）; ，但它也返回-1。

I also tried glGetUniformLocation(shaderProgram_, "bones");, but it also returns -1.

这是着色器：

#version 330 core

uniform mat4 projectionMatrix;
uniform mat4 viewMatrix;
uniform mat4 modelMatrix;
uniform mat4 pvmMatrix;
uniform mat3 normalMatrix;

layout (std140) uniform Bones
{
    mat4 bones[100];
};

layout (location = 0) in vec3 position;
layout (location = 1) in vec4 color;
layout (location = 2) in vec3 normal;
layout (location = 3) in vec2 textureCoordinate;
layout (location = 4) in ivec4 boneIds;
layout (location = 5) in vec4 boneWeights;

out vec4 ourColor;
out vec2 texCoord;
out vec3 normalDirection;

void main()
{
    mat4 bones2[100];
    for(int i=0;i<100;++i)
    {
        bones2[i] = mat4(1.0);
    }

    // Calculate the transformation on the vertex position based on the bone weightings
    mat4 boneTransform = bones2[ boneIds[0] ] * boneWeights[0];
    boneTransform     += bones2[ boneIds[1] ] * boneWeights[1];
    boneTransform     += bones2[ boneIds[2] ] * boneWeights[2];
    boneTransform     += bones2[ boneIds[3] ] * boneWeights[3];

    //mat4 tempM = mat4(1.0);
    //boneTransform = tempM;

    // This is for animating the model
    vec4 tempPosition = boneTransform * vec4(position, 1.0);
    gl_Position = pvmMatrix * tempPosition;

    float sum = boneWeights[0] + boneWeights[1] + boneWeights[2] + boneWeights[3];
    if (sum > 1.01f)
        gl_Position = pvmMatrix * vec4(position, 1.0);
    else if (sum < 0.99f)
        gl_Position = pvmMatrix * vec4(position, 1.0);

    /*
    if (boneIds[0] > 99 || boneIds[0] < 0)
        gl_Position = pvmMatrix * vec4(position, 1.0);
    else if (boneIds[1] > 99 || boneIds[1] < 0)
        gl_Position = pvmMatrix * vec4(position, 1.0);
    else if (boneIds[2] > 99 || boneIds[2] < 0)
        gl_Position = pvmMatrix * vec4(position, 1.0);
    else if (boneIds[3] > 99 || boneIds[3] < 0)
        gl_Position = pvmMatrix * vec4(position, 1.0);
    */
    // Calculate normal
    vec4 normalDirTemp = boneTransform * vec4(normal, 0.0);
    normalDirection = normalize(normalMatrix * normalDirTemp.xyz);

    //gl_Position = vec4(position, 1.0);
    //gl_Position = pvmMatrix * vec4(position, 1.0);
    ourColor = color;
    texCoord = textureCoordinate;

    for(int i=0;i<100;++i)
    {
        if (bones[1] == mat4(0.0))
            ourColor = vec4(0.0, 0.0, 1.0, 1.0);
    }
}

我也尝试使用 mat4的骨骼[100]; 在我的着色器，它给我的统一位置（0），然而，所有的数据 mat4

I also tried using uniform mat4 bones[100]; in my shader, which did give me the uniform location (0), however, all of the data was mat4(0.0), even though I'm pushing data to the uniform.

任何人都有什么想法？

推荐答案

统一块中的制服不具有位置。您可以通过将缓冲区对象绑定到该块的相应绑定索引来设置其值。这是在界面块中穿制服的整个过程。

Uniforms in a uniform block do not have locations. You set their values by binding a buffer object to the appropriate binding index for that block. This is the entire point of putting uniforms in interface blocks.

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