1

我正在尝试获取 gl 上下文，绑定 PixelBuffer 在其中绘制东西。我可以验证 glClearColor 之类的调用是否有效，但是我无法生成任何 gl 列表。我没有想法，这是代码：

typedef GLXContext (*glXCreateContextAttribsARBProc)(Display*, GLXFBConfig, GLXContext, Bool, const int*);
typedef Bool (*glXMakeContextCurrentARBProc)(Display*, GLXDrawable, GLXDrawable, GLXContext);
static glXCreateContextAttribsARBProc glXCreateContextAttribsARB = NULL;
static glXMakeContextCurrentARBProc   glXMakeContextCurrentARB   = NULL;

glXCreateContextAttribsARB = (glXCreateContextAttribsARBProc) glXGetProcAddressARB( (const GLubyte *) "glXCreateContextAttribsARB" );
glXMakeContextCurrentARB   = (glXMakeContextCurrentARBProc)   glXGetProcAddressARB( (const GLubyte *) "glXMakeContextCurrent"      );

const char *displayName = NULL;
Display* display = XOpenDisplay( displayName );

static int visualAttribs[] = { None };

int numberOfFramebufferConfigurations = 0;
GLXFBConfig* fbConfigs = glXChooseFBConfig( display, DefaultScreen(display), visualAttribs, &numberOfFramebufferConfigurations );

if (!fbConfigs)
{
    fprintf(stderr, "The OpenGL on this system does not support glXCreateContextAttribsARB or glXMakeContextCurrent.");
    return;
}

int context_attribs[] = {
    GLX_CONTEXT_MAJOR_VERSION_ARB, 4,
    GLX_CONTEXT_MINOR_VERSION_ARB, 2,
    GLX_CONTEXT_FLAGS_ARB, GLX_CONTEXT_DEBUG_BIT_ARB,
    GLX_CONTEXT_PROFILE_MASK_ARB, GLX_CONTEXT_CORE_PROFILE_BIT_ARB,
    None
};

GLXContext openGLContext = glXCreateContextAttribsARB( display, fbConfigs[0], 0, True, context_attribs);


int pbufferAttribs[] = {
    GLX_PBUFFER_WIDTH,  cols,
    GLX_PBUFFER_HEIGHT, rows,
    None
};

GLXPbuffer pbuffer = glXCreatePbuffer( display, fbConfigs[0], pbufferAttribs );

// clean up:
XFree( fbConfigs );
XSync( display, False );

if (glXMakeContextCurrent( display, pbuffer, pbuffer, openGLContext ) )
{

    if (openGLContext)
            fprintf(stdout, "Got context \n");
    GLuint list = glGenLists(1);
    fprintf(stdout, "Got list %d\n", list); // This is always zero.
    glNewList(list, GL_COMPILE);
    glEndList();

    glClearColor(0, 1, 0, 0);
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1 回答 1

3

您正在请求 4.2 核心上下文，因此没有显示列表。自 GL 3.0 起，它们已被弃用。

于 2013-10-03T17:51:08.250 回答