不能在OpenGL中获得GLSL着色器

Can't get GLSL Shaders in OpenGL

本文关键字：GLSL OpenGL 不能      更新时间：2023-10-16

我在这台机器上开发opengl已经有一段时间了，突然，GLEW报告我没有让opengl glsl运行所需的扩展，即使它在其他项目中工作。有趣的是，我甚至得到

OpenGL Vendor: NVIDIA Corporation
OpenGL Renderer: GeForce 610M/PCIe/SSE2
OpenGL Version: 3.3.0
OpenGL 2.0 is available!
[FAILED] OpenGL Shading Language is not available...

我使用glsllib 0.9.4来加载扩展，而扩展又使用GLEW。我的代码如下:

bool Jogo::init() {
    if(glfwInit() != GL_TRUE) return false;
    glfwOpenWindowHint(GLFW_FSAA_SAMPLES, 4);
    glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 3);
    glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 3);
    glfwOpenWindowHint(GLFW_WINDOW_NO_RESIZE, GL_TRUE);
    if(glfwOpenWindow(1024, 768, 0, 0, 0, 0, 32, 0, GLFW_WINDOW) != GL_TRUE) return false;
    glewExperimental = true;
    if(initGLExtensions() != true) return false;
    glm::mat4 matrizModel = glm::mat4(1.0f);
    glm::mat4 matrizView = glm::lookAt(glm::vec3(0, 0, 3), glm::vec3(0, 0, 0), glm::vec3(0, 1, 0));
    glm::mat4 matrizProjecao = glm::perspective(45.0f, 9.0f/16.0f, -1.0f, 1.0f);
    m_matrizMVP = matrizProjecao * matrizView * matrizModel;
    m_shader = m_gerenciadorShader.loadfromFile("vshader.glsl", "fshader.glsl");
    char *x = m_shader->getLinkerLog();
    m_shader->setUniformMatrix4fv("mvp", 1, GL_FALSE, &(m_matrizMVP[0][0]));
    m_world = new World();
    glClearColor(0.0f, 0.2f, 0.5f, 0.0f);
    glClearDepth(0.0f);
    return true;
}

glsllib加载扩展的代码如下:

 bool GLSLAPI initGLExtensions(void) {
     if (extensions_init) return true;
     extensions_init = true;
     GLenum err = glewInit();
     if (GLEW_OK != err) {
         cout << "Error:" << glewGetErrorString(err) << endl;
         extensions_init = false;
         return false;
     }
     cout << "OpenGL Vendor: " << (char*) glGetString(GL_VENDOR) << "n";
     cout << "OpenGL Renderer: " << (char*) glGetString(GL_RENDERER) << "n";
     cout << "OpenGL Version: " << (char*) glGetString(GL_VERSION) << "nn";
     checkGLSL();
     return true;
}

CheckGLSL查找glewGetExtension("GL_ARB_fragment_shader")和glewGetExtension("GL_ARB_vertex_shader")以查看是否支持GLSL。

注:如果我删除glewExperimental，代码在glGenVertexArrays上崩溃

不幸的是，GLEW并不能真正与当前的OpenGL开发相匹配，特别是涉及核心上下文或显式版本配置文件时。直到最近我才遇到同样的问题，也是与GLFW有关。忽略设置OpenGL版本窗口提示确实为我解决了这个问题。即禁用或删除这两个调用:

glfwOpenWindowHint(GLFW_OPENGL_VERSION_MAJOR, 3);
glfwOpenWindowHint(GLFW_OPENGL_VERSION_MINOR, 3);
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