我正在尝试用openGL GLFW库在窗口上画一个三角形。下面是我的完整代码
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <iostream>
using namespace std;
static unsigned int compileShader ( unsigned int type, const string& source ){
    unsigned int id = glCreateShader ( type );
    const char* src = source.c_str();
    glShaderSource ( id, 1, &src, nullptr );
    glCompileShader ( id );
    
    int result = 0;
    glGetShaderiv ( id, GL_COMPILE_STATUS, &result );
    if ( result == GL_FALSE ){
        int length = 0;
        glGetShaderiv ( id, GL_INFO_LOG_LENGTH, &length );
        char* message = ( char* ) alloca ( length * sizeof ( char ) );
        glGetShaderInfoLog ( id, length, &length, message );
        cout << "Failed to compile " << ( type == GL_VERTEX_SHADER ? "vertex" : "fragment" ) <<  "shader" << endl;
        cout << message << endl;
        glDeleteShader ( id );
    }
    return id;
}
static int createShader ( const string& vertexShader, const string& fragmentShader ){
    unsigned int program = glCreateProgram();
    unsigned int vs = compileShader ( GL_VERTEX_SHADER, vertexShader );
    unsigned int fs = compileShader ( GL_FRAGMENT_SHADER, fragmentShader );
    
    glAttachShader ( program, vs );
    glAttachShader ( program, fs );
    glLinkProgram ( program );
    glValidateProgram ( program );
    glDeleteShader ( vs );
    glDeleteShader ( fs );
    return program;
}
int main(void)
{
    GLFWwindow* window;  
    /* Initialize the library */
    if (!glfwInit())
        return -1;
    /* Create a windowed mode window and its OpenGL context */
    window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
    if (!window)
    {
        glfwTerminate();
        return -1;
    }
   
    /* Make the window's context current */
    glfwMakeContextCurrent(window);
    if ( glewInit() != GLEW_OK ) 
        cout << "error" << endl;
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR,3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR,3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
    cout << glGetString ( GL_VERSION ) << endl;
    float positions [ 6 ] = {
        -0.5f, -0.5f,
         0.0f,  0.5f,
         0.5f, -0.5f
    };
    unsigned int buffer;
    glGenBuffers ( 1, &buffer );
    glBindBuffer ( GL_ARRAY_BUFFER, buffer );
    glBufferData ( GL_ARRAY_BUFFER, 6 * sizeof ( float ),positions, GL_STATIC_DRAW );
    glEnableVertexAttribArray ( 0 );
    glVertexAttribPointer ( 0, 2, GL_FLOAT, GL_FALSE, sizeof ( float ) * 2, 0 );
    string vertexShader = 
        "#version 320 core\n"
        "\n"
        "layout ( location = 0 ) in vec4 position;"
        "\n"
        "void main(){\n"
            "gl_Position = position;\n"
        "}\n";
    string fragmentShader = 
        "#version 320 core\n"
        "\n"
        "layout ( location = 0 ) out vec4 color;"
        "\n"
        "void main(){\n"
            "color = vec4(1.0,0.0,0.0,1.0);\n"
        "}\n";
    unsigned int shader = createShader(vertexShader, fragmentShader );
    glUseProgram ( shader );
    /* Loop until the user closes the window */
    while (!glfwWindowShouldClose(window))
    {
        /* Render here */
        glClear(GL_COLOR_BUFFER_BIT);
    glDrawArrays ( GL_TRIANGLES, 0, 3 );
        /* Swap front and back buffers */
        glfwSwapBuffers(window);
        /* Poll for and process events */
        glfwPollEvents();
    }
    glfwTerminate();
    return 0;
}这是我得到的输出
3.0 Mesa 18.0.5
Failed to compile vertexshader
0:1(10): error: GLSL 3.20 is not supported. Supported versions are: 1.10, 1.20, 1.30, 1.00 ES, 3.00 ES, 3.10 ES, and 3.20 ES
Failed to compile fragmentshader
0:1(10): error: GLSL 3.20 is not supported. Supported versions are: 1.10, 1.20, 1.30, 1.00 ES, 3.00 ES, 3.10 ES, and 3.20 ES我已经在这个问题上工作了一整天,但没有找到任何解决方案。我对openGL编程完全陌生,这是我的第一次尝试。我使用的是ubuntu 18.04,这是sudo glxinfo | grep "OpenGL"的输出
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) HD Graphics 620 (Kaby Lake GT2) 
OpenGL core profile version string: 4.5 (Core Profile) Mesa 18.0.5
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 18.0.5
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.2 Mesa 18.0.5
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20
OpenGL ES profile extensions:发布于 2019-09-17 11:19:48
我通过在linux上运行以下命令解决了这个问题:
export MESA_GL_VERSION_OVERRIDE=3.3https://stackoverflow.com/questions/52592309
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