glsl - glGetProgramBinary 导致 GL_INVALID_OPERATION

Question

我正在尝试从已有效编译和链接的程序中检索二进制文件。我已经通过 GL_PROGRAM_BINARY_LENGTH 收到了它的长度。该文档说有两个实例可能会发生 GL_INVALID_OPERATION - 一个失败的链接和 bufSize 小于程序的大小。我读到有些人在链接之前未能提供 GL_PROGRAM_BINARY_RETRIEVABLE_HINT 时出现此错误，但对我而言并非如此。我还验证了该程序，可以肯定...并验证了 GL_ARB_get_program_binary 受支持。

我们连接了一个 glDebugMessageCallbackARB，它提供了一些额外的信息:“生成了 GL_INVALID_OPERATION 错误。对象不是程序或着色器对象。”通过在错误消息中搜索该额外位，我一无所获。

OGL 版本 4.2，glsl 1.5。这是在带有最新驱动程序的 nVidia GeForce GTX 660 上。 Windows 7。

相关代码如下:

GLuint compileShaderBlock(GLenum type, const char* shaderCode, const int shaderSize) 
{
    GLuint shaderId = 0;

    if (shaderCode != NULL)
    {
        shaderId= glCreateShader(type);
        glShaderSource(shaderId, 1, &shaderCode, &shaderSize);
        glCompileShader(shaderId);
    }

    return shaderId;
};

static GLchar errBuff[4096];
bool validateShader(GLuint shaderID)
{
    GLint compiled;
    glGetShaderiv(shaderID, GL_COMPILE_STATUS, &compiled);

    GLsizei length = 0;

    glGetShaderiv(shaderID, GL_INFO_LOG_LENGTH, &length);

    char* buffer = new char[length];

    if (!compiled && length > 0)
    {
        GLsizei outputlen;    
        glGetShaderInfoLog(shaderID, length, &outputlen, buffer);
        GLsizei size = 0;
        glGetShaderSource(shaderID, 4096, &size, errBuff);
    }

    assert(compiled == GL_TRUE, "Shader compile error: \n%s", buffer);
    delete[] buffer;

    return compiled == GL_TRUE;
}

bool validateLink(GLuint programID)
{
    GLint linkResult = GL_TRUE;
    glGetProgramiv(programID, GL_LINK_STATUS, &linkResult);

    if (linkResult == GL_FALSE)
    {
        GLsizei outputlen, length = 0;
        glGetProgramiv(programID, GL_INFO_LOG_LENGTH, &length);

        char* buffer = new char[length];
        glGetProgramInfoLog(programID, length, &outputlen, buffer);

        assert(linkResult == GL_TRUE, "Program %d link error %s", programID, buffer);
        delete[] buffer;
        return GL_FALSE;
    }

    return GL_TRUE;
}

....

shader->vertexShaderId = compileShaderBlock(GL_VERTEX_SHADER, vsDataString.ToChar(), vsDataString.Length());
shader->fragmentShaderId = compileShaderBlock(GL_FRAGMENT_SHADER, fsDataString.ToChar(), fsDataString.Length());

validateShader(shader->vertexShaderId, "");
validateShader(shader->fragmentShaderId, "");

shader->programId = glCreateProgram();
glAttachShader(shader->programId, shader->vertexShaderId);
glAttachShader(shader->programId, shader->fragmentShaderId);

//Care about outputs
glBindFragDataLocation(shader->programId, 0, "outColor0");
glBindFragDataLocation(shader->programId, 1, "outColor1");
glBindFragDataLocation(shader->programId, 2, "outColor2");
glBindFragDataLocation(shader->programId, 3, "outColor3");

// let it know we plan on retrieving a binary
glProgramParameteri(shader->programId, GL_PROGRAM_BINARY_RETRIEVABLE_HINT, GL_TRUE);

glLinkProgram(shader->programId);

... set attributes and uniforms (removing this doesn't change anything)
... do mock render (removing this doesn't change anything)

validateLink(shader->programId);

glValidateProgram((shader->programID);
GLint validateStatus;
glGetProgramiv((shader->programID, GL_VALIDATE_STATUS, &validateStatus);

glUseProgram(shader->programId);

GLint len = 0;
glGetProgramiv(shader->programId, GL_PROGRAM_BINARY_LENGTH, &len);

if (len > 0)
{
    uint8* binary = new uint8[len];
    GLenum binaryFormat;
    **ERROR** --> glGetProgramBinary(shader->programId, len, NULL, &binaryFormat, binary);
}

我觉得这没有任何意义，是不是我遗漏了什么？？？

Answer 1

所以这是一个非常愚蠢的复制/粘贴错误，但它可能对将来的某人有用的可能性很小...

glGetProgramBinary 被设置为另一个 gl 函数...