glGetProgramBinary causing 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。我已经收到了它的长度GL_PROGRAM_BINARY_LENGTH。文档说有两种情况可能会发生GL_INVALID_OPERATION - 链接失败和bufSize小于程序的大小。我读到有些人在链接之前未能给出GL_PROGRAM_BINARY_RETRIEVABLE_HINT时遇到了此错误，这对我来说并非如此。我可以肯定的是，我也验证了该程序...并验证是否支持GL_ARB_get_program_binary。

我们连接了一个glDebugMessageCallbackARB，它提供了一些额外的信息："GL_INVALID_OPERATION错误生成。对象不是程序或着色器对象。通过在错误消息中搜索额外的位，我什么也没找到。

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。视窗 7.

以下是相关代码：

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，我错过了什么吗???

Answer 1

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

glGetProgramBinary 被设置为另一个 gl 函数...