Esempio n. 1
0
int _glfwCreateContext(_GLFWwindow* window,
                       const _GLFWwndconfig* wndconfig,
                       const _GLFWfbconfig* fbconfig)
{
    _GLFWfbconfig closest;

    // Choose the best available fbconfig
    {
        unsigned int fbcount;
        _GLFWfbconfig* fbconfigs;
        const _GLFWfbconfig* result;

        fbconfigs = getFBConfigs(window, &fbcount);
        if (!fbconfigs)
            return GL_FALSE;

        result = _glfwChooseFBConfig(fbconfig, fbconfigs, fbcount);
        if (!result)
        {
            _glfwSetError(GLFW_PLATFORM_ERROR,
                          "GLX: No GLXFBConfig matched the criteria");

            free(fbconfigs);
            return GL_FALSE;
        }

        closest = *result;
        free(fbconfigs);
    }

    return createContext(window, wndconfig, closest.platformID);
}
Esempio n. 2
0
int _glfwCreateContext(_GLFWwindow* window,
                       const _GLFWwndconfig* wndconfig,
                       const _GLFWfbconfig* fbconfig)
{
    _GLFWfbconfig closest;

    window->WGL.DC = GetDC(window->Win32.handle);
    if (!window->WGL.DC)
    {
        _glfwSetError(GLFW_PLATFORM_ERROR,
                      "Win32: Failed to retrieve DC for window");
        return GL_FALSE;
    }

    // Choose the best available fbconfig
    {
        unsigned int fbcount;
        _GLFWfbconfig* fbconfigs;
        const _GLFWfbconfig* result;

        fbconfigs = getFBConfigs(window, &fbcount);
        if (!fbconfigs)
            return GL_FALSE;

        result = _glfwChooseFBConfig(fbconfig, fbconfigs, fbcount);
        if (!result)
        {
            _glfwSetError(GLFW_FORMAT_UNAVAILABLE,
                          "Win32/WGL: No pixel format matched the criteria");

            free(fbconfigs);
            return GL_FALSE;
        }

        closest = *result;
        free(fbconfigs);
    }

    return createContext(window, wndconfig, (int) closest.platformID);
}
Esempio n. 3
0
// Return the GLXFBConfig most closely matching the specified hints
//
static GLFWbool chooseGLXFBConfig(const _GLFWfbconfig* desired, GLXFBConfig* result)
{
    GLXFBConfig* nativeConfigs;
    _GLFWfbconfig* usableConfigs;
    const _GLFWfbconfig* closest;
    int i, nativeCount, usableCount;
    const char* vendor;
    GLFWbool trustWindowBit = GLFW_TRUE;

    // HACK: This is a (hopefully temporary) workaround for Chromium
    //       (VirtualBox GL) not setting the window bit on any GLXFBConfigs
    vendor = glXGetClientString(_glfw.x11.display, GLX_VENDOR);
    if (strcmp(vendor, "Chromium") == 0)
        trustWindowBit = GLFW_FALSE;

    nativeConfigs =
        glXGetFBConfigs(_glfw.x11.display, _glfw.x11.screen, &nativeCount);
    if (!nativeCount)
    {
        _glfwInputError(GLFW_API_UNAVAILABLE, "GLX: No GLXFBConfigs returned");
        return GLFW_FALSE;
    }

    usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));
    usableCount = 0;

    for (i = 0;  i < nativeCount;  i++)
    {
        const GLXFBConfig n = nativeConfigs[i];
        _GLFWfbconfig* u = usableConfigs + usableCount;

        // Only consider RGBA GLXFBConfigs
        if (!(getGLXFBConfigAttrib(n, GLX_RENDER_TYPE) & GLX_RGBA_BIT))
            continue;

        // Only consider window GLXFBConfigs
        if (!(getGLXFBConfigAttrib(n, GLX_DRAWABLE_TYPE) & GLX_WINDOW_BIT))
        {
            if (trustWindowBit)
                continue;
        }

        u->redBits = getGLXFBConfigAttrib(n, GLX_RED_SIZE);
        u->greenBits = getGLXFBConfigAttrib(n, GLX_GREEN_SIZE);
        u->blueBits = getGLXFBConfigAttrib(n, GLX_BLUE_SIZE);

        u->alphaBits = getGLXFBConfigAttrib(n, GLX_ALPHA_SIZE);
        u->depthBits = getGLXFBConfigAttrib(n, GLX_DEPTH_SIZE);
        u->stencilBits = getGLXFBConfigAttrib(n, GLX_STENCIL_SIZE);

        u->accumRedBits = getGLXFBConfigAttrib(n, GLX_ACCUM_RED_SIZE);
        u->accumGreenBits = getGLXFBConfigAttrib(n, GLX_ACCUM_GREEN_SIZE);
        u->accumBlueBits = getGLXFBConfigAttrib(n, GLX_ACCUM_BLUE_SIZE);
        u->accumAlphaBits = getGLXFBConfigAttrib(n, GLX_ACCUM_ALPHA_SIZE);

        u->auxBuffers = getGLXFBConfigAttrib(n, GLX_AUX_BUFFERS);

        if (getGLXFBConfigAttrib(n, GLX_STEREO))
            u->stereo = GLFW_TRUE;
        if (getGLXFBConfigAttrib(n, GLX_DOUBLEBUFFER))
            u->doublebuffer = GLFW_TRUE;

        if (_glfw.glx.ARB_multisample)
            u->samples = getGLXFBConfigAttrib(n, GLX_SAMPLES);

        if (_glfw.glx.ARB_framebuffer_sRGB || _glfw.glx.EXT_framebuffer_sRGB)
            u->sRGB = getGLXFBConfigAttrib(n, GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB);

        u->handle = (uintptr_t) n;
        usableCount++;
    }

    closest = _glfwChooseFBConfig(desired, usableConfigs, usableCount);
    if (closest)
        *result = (GLXFBConfig) closest->handle;

    XFree(nativeConfigs);
    free(usableConfigs);

    return closest != NULL;
}
Esempio n. 4
0
// Return a list of available and usable framebuffer configs
//
static GLboolean chooseFBConfigs(const _GLFWctxconfig* ctxconfig,
                                 const _GLFWfbconfig* desired,
                                 EGLConfig* result)
{
    EGLConfig* nativeConfigs;
    _GLFWfbconfig* usableConfigs;
    const _GLFWfbconfig* closest;
    int i, nativeCount, usableCount;

    eglGetConfigs(_glfw.egl.display, NULL, 0, &nativeCount);
    if (!nativeCount)
    {
        _glfwInputError(GLFW_API_UNAVAILABLE, "EGL: No EGLConfigs returned");
        return GL_FALSE;
    }

    nativeConfigs = calloc(nativeCount, sizeof(EGLConfig));
    eglGetConfigs(_glfw.egl.display, nativeConfigs, nativeCount, &nativeCount);

    usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));
    usableCount = 0;

    for (i = 0;  i < nativeCount;  i++)
    {
        const EGLConfig n = nativeConfigs[i];
        _GLFWfbconfig* u = usableConfigs + usableCount;

#if defined(_GLFW_X11)
        if (!getConfigAttrib(n, EGL_NATIVE_VISUAL_ID))
        {
            // Only consider EGLConfigs with associated visuals
            continue;
        }
#endif // _GLFW_X11

        if (!(getConfigAttrib(n, EGL_COLOR_BUFFER_TYPE) & EGL_RGB_BUFFER))
        {
            // Only consider RGB(A) EGLConfigs
            continue;
        }

        if (!(getConfigAttrib(n, EGL_SURFACE_TYPE) & EGL_WINDOW_BIT))
        {
            // Only consider window EGLConfigs
            continue;
        }

        if (ctxconfig->api == GLFW_OPENGL_ES_API)
        {
            if (ctxconfig->major == 1)
            {
                if (!(getConfigAttrib(n, EGL_RENDERABLE_TYPE) & EGL_OPENGL_ES_BIT))
                    continue;
            }
            else
            {
                if (!(getConfigAttrib(n, EGL_RENDERABLE_TYPE) & EGL_OPENGL_ES2_BIT))
                    continue;
            }
        }
        else if (ctxconfig->api == GLFW_OPENGL_API)
        {
            if (!(getConfigAttrib(n, EGL_RENDERABLE_TYPE) & EGL_OPENGL_BIT))
                continue;
        }

        u->redBits = getConfigAttrib(n, EGL_RED_SIZE);
        u->greenBits = getConfigAttrib(n, EGL_GREEN_SIZE);
        u->blueBits = getConfigAttrib(n, EGL_BLUE_SIZE);

        u->alphaBits = getConfigAttrib(n, EGL_ALPHA_SIZE);
        u->depthBits = getConfigAttrib(n, EGL_DEPTH_SIZE);
        u->stencilBits = getConfigAttrib(n, EGL_STENCIL_SIZE);

        u->samples = getConfigAttrib(n, EGL_SAMPLES);
        u->doublebuffer = GL_TRUE;

        u->egl = n;
        usableCount++;
    }

    closest = _glfwChooseFBConfig(desired, usableConfigs, usableCount);
    if (closest)
        *result = closest->egl;

    free(nativeConfigs);
    free(usableConfigs);

    return closest ? GL_TRUE : GL_FALSE;
}
Esempio n. 5
0
// Return a list of available and usable framebuffer configs
//
static GLboolean choosePixelFormat(_GLFWwindow* window,
                                   const _GLFWfbconfig* desired,
                                   int* result)
{
    _GLFWfbconfig* usableConfigs;
    const _GLFWfbconfig* closest;
    int i, nativeCount, usableCount;

    if (window->wgl.ARB_pixel_format)
    {
        nativeCount = getPixelFormatAttrib(window,
                                         1,
                                         WGL_NUMBER_PIXEL_FORMATS_ARB);
    }
    else
    {
        nativeCount = DescribePixelFormat(window->wgl.dc,
                                          1,
                                          sizeof(PIXELFORMATDESCRIPTOR),
                                          NULL);
    }

    if (!nativeCount)
    {
        _glfwInputError(GLFW_API_UNAVAILABLE, "WGL: No pixel formats found");
        return GL_FALSE;
    }

    usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));
    usableCount = 0;

    for (i = 0;  i < nativeCount;  i++)
    {
        const int n = i + 1;
        _GLFWfbconfig* u = usableConfigs + usableCount;

        if (window->wgl.ARB_pixel_format)
        {
            // Get pixel format attributes through WGL_ARB_pixel_format
            if (!getPixelFormatAttrib(window, n, WGL_SUPPORT_OPENGL_ARB) ||
                !getPixelFormatAttrib(window, n, WGL_DRAW_TO_WINDOW_ARB) ||
                !getPixelFormatAttrib(window, n, WGL_DOUBLE_BUFFER_ARB))
            {
                continue;
            }

            if (getPixelFormatAttrib(window, n, WGL_PIXEL_TYPE_ARB) !=
                WGL_TYPE_RGBA_ARB)
            {
                continue;
            }

            if (getPixelFormatAttrib(window, n, WGL_ACCELERATION_ARB) ==
                 WGL_NO_ACCELERATION_ARB)
            {
                continue;
            }

            u->redBits = getPixelFormatAttrib(window, n, WGL_RED_BITS_ARB);
            u->greenBits = getPixelFormatAttrib(window, n, WGL_GREEN_BITS_ARB);
            u->blueBits = getPixelFormatAttrib(window, n, WGL_BLUE_BITS_ARB);
            u->alphaBits = getPixelFormatAttrib(window, n, WGL_ALPHA_BITS_ARB);

            u->depthBits = getPixelFormatAttrib(window, n, WGL_DEPTH_BITS_ARB);
            u->stencilBits = getPixelFormatAttrib(window, n, WGL_STENCIL_BITS_ARB);

            u->accumRedBits = getPixelFormatAttrib(window, n, WGL_ACCUM_RED_BITS_ARB);
            u->accumGreenBits = getPixelFormatAttrib(window, n, WGL_ACCUM_GREEN_BITS_ARB);
            u->accumBlueBits = getPixelFormatAttrib(window, n, WGL_ACCUM_BLUE_BITS_ARB);
            u->accumAlphaBits = getPixelFormatAttrib(window, n, WGL_ACCUM_ALPHA_BITS_ARB);

            u->auxBuffers = getPixelFormatAttrib(window, n, WGL_AUX_BUFFERS_ARB);
            u->stereo = getPixelFormatAttrib(window, n, WGL_STEREO_ARB);

            if (window->wgl.ARB_multisample)
                u->samples = getPixelFormatAttrib(window, n, WGL_SAMPLES_ARB);

            if (window->wgl.ARB_framebuffer_sRGB)
                u->sRGB = getPixelFormatAttrib(window, n, WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB);
        }
        else
        {
            PIXELFORMATDESCRIPTOR pfd;

            // Get pixel format attributes through old-fashioned PFDs

            if (!DescribePixelFormat(window->wgl.dc,
                                     n,
                                     sizeof(PIXELFORMATDESCRIPTOR),
                                     &pfd))
            {
                continue;
            }

            if (!(pfd.dwFlags & PFD_DRAW_TO_WINDOW) ||
                !(pfd.dwFlags & PFD_SUPPORT_OPENGL) ||
                !(pfd.dwFlags & PFD_DOUBLEBUFFER))
            {
                continue;
            }

            if (!(pfd.dwFlags & PFD_GENERIC_ACCELERATED) &&
                (pfd.dwFlags & PFD_GENERIC_FORMAT))
            {
                continue;
            }

            if (pfd.iPixelType != PFD_TYPE_RGBA)
                continue;

            u->redBits = pfd.cRedBits;
            u->greenBits = pfd.cGreenBits;
            u->blueBits = pfd.cBlueBits;
            u->alphaBits = pfd.cAlphaBits;

            u->depthBits = pfd.cDepthBits;
            u->stencilBits = pfd.cStencilBits;

            u->accumRedBits = pfd.cAccumRedBits;
            u->accumGreenBits = pfd.cAccumGreenBits;
            u->accumBlueBits = pfd.cAccumBlueBits;
            u->accumAlphaBits = pfd.cAccumAlphaBits;

            u->auxBuffers = pfd.cAuxBuffers;
            u->stereo = (pfd.dwFlags & PFD_STEREO) ? GL_TRUE : GL_FALSE;
        }

        u->wgl = n;
        usableCount++;
    }

    closest = _glfwChooseFBConfig(desired, usableConfigs, usableCount);
    if (!closest)
    {
        free(usableConfigs);
        return GL_FALSE;
    }

    *result = closest->wgl;
    free(usableConfigs);

    return GL_TRUE;
}
Esempio n. 6
0
// Return a list of available and usable framebuffer configs
//
static int choosePixelFormat(_GLFWwindow* window,
                             const _GLFWctxconfig* ctxconfig,
                             const _GLFWfbconfig* fbconfig)
{
    _GLFWfbconfig* usableConfigs;
    const _GLFWfbconfig* closest;
    int i, pixelFormat, nativeCount, usableCount = 0, attribCount = 0;
    int attribs[40];
    int values[sizeof(attribs) / sizeof(attribs[0])];

    if (_glfw.wgl.ARB_pixel_format)
    {
        const int attrib = WGL_NUMBER_PIXEL_FORMATS_ARB;

        if (!_glfw.wgl.GetPixelFormatAttribivARB(window->context.wgl.dc,
                                                 1, 0, 1, &attrib, &nativeCount))
        {
            _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
                                 "WGL: Failed to retrieve pixel format attribute");
            return 0;
        }

        addAttrib(WGL_SUPPORT_OPENGL_ARB);
        addAttrib(WGL_DRAW_TO_WINDOW_ARB);
        addAttrib(WGL_PIXEL_TYPE_ARB);
        addAttrib(WGL_ACCELERATION_ARB);
        addAttrib(WGL_RED_BITS_ARB);
        addAttrib(WGL_RED_SHIFT_ARB);
        addAttrib(WGL_GREEN_BITS_ARB);
        addAttrib(WGL_GREEN_SHIFT_ARB);
        addAttrib(WGL_BLUE_BITS_ARB);
        addAttrib(WGL_BLUE_SHIFT_ARB);
        addAttrib(WGL_ALPHA_BITS_ARB);
        addAttrib(WGL_ALPHA_SHIFT_ARB);
        addAttrib(WGL_DEPTH_BITS_ARB);
        addAttrib(WGL_STENCIL_BITS_ARB);
        addAttrib(WGL_ACCUM_BITS_ARB);
        addAttrib(WGL_ACCUM_RED_BITS_ARB);
        addAttrib(WGL_ACCUM_GREEN_BITS_ARB);
        addAttrib(WGL_ACCUM_BLUE_BITS_ARB);
        addAttrib(WGL_ACCUM_ALPHA_BITS_ARB);
        addAttrib(WGL_AUX_BUFFERS_ARB);
        addAttrib(WGL_STEREO_ARB);
        addAttrib(WGL_DOUBLE_BUFFER_ARB);

        if (_glfw.wgl.ARB_multisample)
            addAttrib(WGL_SAMPLES_ARB);

        if (ctxconfig->client == GLFW_OPENGL_API)
        {
            if (_glfw.wgl.ARB_framebuffer_sRGB || _glfw.wgl.EXT_framebuffer_sRGB)
                addAttrib(WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB);
        }
        else
        {
            if (_glfw.wgl.EXT_colorspace)
                addAttrib(WGL_COLORSPACE_EXT);
        }
    }
    else
    {
        nativeCount = DescribePixelFormat(window->context.wgl.dc,
                                          1,
                                          sizeof(PIXELFORMATDESCRIPTOR),
                                          NULL);
    }

    usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));

    for (i = 0;  i < nativeCount;  i++)
    {
        _GLFWfbconfig* u = usableConfigs + usableCount;
        pixelFormat = i + 1;

        if (_glfw.wgl.ARB_pixel_format)
        {
            // Get pixel format attributes through "modern" extension

            if (!_glfw.wgl.GetPixelFormatAttribivARB(window->context.wgl.dc,
                                                     pixelFormat, 0,
                                                     attribCount,
                                                     attribs, values))
            {
                _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
                                    "WGL: Failed to retrieve pixel format attributes");

                free(usableConfigs);
                return 0;
            }

            if (!findAttribValue(WGL_SUPPORT_OPENGL_ARB) ||
                !findAttribValue(WGL_DRAW_TO_WINDOW_ARB))
            {
                continue;
            }

            if (findAttribValue(WGL_PIXEL_TYPE_ARB) != WGL_TYPE_RGBA_ARB)
                continue;

            if (findAttribValue(WGL_ACCELERATION_ARB) == WGL_NO_ACCELERATION_ARB)
                continue;

            u->redBits = findAttribValue(WGL_RED_BITS_ARB);
            u->greenBits = findAttribValue(WGL_GREEN_BITS_ARB);
            u->blueBits = findAttribValue(WGL_BLUE_BITS_ARB);
            u->alphaBits = findAttribValue(WGL_ALPHA_BITS_ARB);

            u->depthBits = findAttribValue(WGL_DEPTH_BITS_ARB);
            u->stencilBits = findAttribValue(WGL_STENCIL_BITS_ARB);

            u->accumRedBits = findAttribValue(WGL_ACCUM_RED_BITS_ARB);
            u->accumGreenBits = findAttribValue(WGL_ACCUM_GREEN_BITS_ARB);
            u->accumBlueBits = findAttribValue(WGL_ACCUM_BLUE_BITS_ARB);
            u->accumAlphaBits = findAttribValue(WGL_ACCUM_ALPHA_BITS_ARB);

            u->auxBuffers = findAttribValue(WGL_AUX_BUFFERS_ARB);

            if (findAttribValue(WGL_STEREO_ARB))
                u->stereo = GLFW_TRUE;
            if (findAttribValue(WGL_DOUBLE_BUFFER_ARB))
                u->doublebuffer = GLFW_TRUE;

            if (_glfw.wgl.ARB_multisample)
                u->samples = findAttribValue(WGL_SAMPLES_ARB);

            if (ctxconfig->client == GLFW_OPENGL_API)
            {
                if (_glfw.wgl.ARB_framebuffer_sRGB ||
                    _glfw.wgl.EXT_framebuffer_sRGB)
                {
                    if (findAttribValue(WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB))
                        u->sRGB = GLFW_TRUE;
                }
            }
            else
            {
                if (_glfw.wgl.EXT_colorspace)
                {
                    if (findAttribValue(WGL_COLORSPACE_EXT) == WGL_COLORSPACE_SRGB_EXT)
                        u->sRGB = GLFW_TRUE;
                }
            }
        }
        else
        {
            // Get pixel format attributes through legacy PFDs

            PIXELFORMATDESCRIPTOR pfd;

            if (!DescribePixelFormat(window->context.wgl.dc,
                                     pixelFormat,
                                     sizeof(PIXELFORMATDESCRIPTOR),
                                     &pfd))
            {
                _glfwInputErrorWin32(GLFW_PLATFORM_ERROR,
                                    "WGL: Failed to describe pixel format");

                free(usableConfigs);
                return 0;
            }

            if (!(pfd.dwFlags & PFD_DRAW_TO_WINDOW) ||
                !(pfd.dwFlags & PFD_SUPPORT_OPENGL))
            {
                continue;
            }

            if (!(pfd.dwFlags & PFD_GENERIC_ACCELERATED) &&
                (pfd.dwFlags & PFD_GENERIC_FORMAT))
            {
                continue;
            }

            if (pfd.iPixelType != PFD_TYPE_RGBA)
                continue;

            u->redBits = pfd.cRedBits;
            u->greenBits = pfd.cGreenBits;
            u->blueBits = pfd.cBlueBits;
            u->alphaBits = pfd.cAlphaBits;

            u->depthBits = pfd.cDepthBits;
            u->stencilBits = pfd.cStencilBits;

            u->accumRedBits = pfd.cAccumRedBits;
            u->accumGreenBits = pfd.cAccumGreenBits;
            u->accumBlueBits = pfd.cAccumBlueBits;
            u->accumAlphaBits = pfd.cAccumAlphaBits;

            u->auxBuffers = pfd.cAuxBuffers;

            if (pfd.dwFlags & PFD_STEREO)
                u->stereo = GLFW_TRUE;
            if (pfd.dwFlags & PFD_DOUBLEBUFFER)
                u->doublebuffer = GLFW_TRUE;
        }

        u->handle = pixelFormat;
        usableCount++;
    }

    if (!usableCount)
    {
        _glfwInputError(GLFW_API_UNAVAILABLE,
                        "WGL: The driver does not appear to support OpenGL");

        free(usableConfigs);
        return 0;
    }

    closest = _glfwChooseFBConfig(fbconfig, usableConfigs, usableCount);
    if (!closest)
    {
        _glfwInputError(GLFW_FORMAT_UNAVAILABLE,
                        "WGL: Failed to find a suitable pixel format");

        free(usableConfigs);
        return 0;
    }

    pixelFormat = (int) closest->handle;
    free(usableConfigs);

    return pixelFormat;
}
Esempio n. 7
0
// Return a list of available and usable framebuffer configs
//
static GLFWbool choosePixelFormat(_GLFWwindow* window,
                                  const _GLFWfbconfig* desired,
                                  int* result)
{
    _GLFWfbconfig* usableConfigs;
    const _GLFWfbconfig* closest;
    int i, nativeCount, usableCount;

    if (_glfw.wgl.ARB_pixel_format)
    {
        nativeCount = getPixelFormatAttrib(window,
                                         1,
                                         WGL_NUMBER_PIXEL_FORMATS_ARB);
    }
    else
    {
        nativeCount = DescribePixelFormat(window->context.wgl.dc,
                                          1,
                                          sizeof(PIXELFORMATDESCRIPTOR),
                                          NULL);
    }

    usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));
    usableCount = 0;

    for (i = 0;  i < nativeCount;  i++)
    {
        const int n = i + 1;
        _GLFWfbconfig* u = usableConfigs + usableCount;

        if (_glfw.wgl.ARB_pixel_format)
        {
            // Get pixel format attributes through "modern" extension

            if (!getPixelFormatAttrib(window, n, WGL_SUPPORT_OPENGL_ARB) ||
                !getPixelFormatAttrib(window, n, WGL_DRAW_TO_WINDOW_ARB))
            {
                continue;
            }

            if (getPixelFormatAttrib(window, n, WGL_PIXEL_TYPE_ARB) !=
                WGL_TYPE_RGBA_ARB)
            {
                continue;
            }

            if (getPixelFormatAttrib(window, n, WGL_ACCELERATION_ARB) ==
                 WGL_NO_ACCELERATION_ARB)
            {
                continue;
            }

            u->redBits = getPixelFormatAttrib(window, n, WGL_RED_BITS_ARB);
            u->greenBits = getPixelFormatAttrib(window, n, WGL_GREEN_BITS_ARB);
            u->blueBits = getPixelFormatAttrib(window, n, WGL_BLUE_BITS_ARB);
            u->alphaBits = getPixelFormatAttrib(window, n, WGL_ALPHA_BITS_ARB);

            u->depthBits = getPixelFormatAttrib(window, n, WGL_DEPTH_BITS_ARB);
            u->stencilBits = getPixelFormatAttrib(window, n, WGL_STENCIL_BITS_ARB);

            u->accumRedBits = getPixelFormatAttrib(window, n, WGL_ACCUM_RED_BITS_ARB);
            u->accumGreenBits = getPixelFormatAttrib(window, n, WGL_ACCUM_GREEN_BITS_ARB);
            u->accumBlueBits = getPixelFormatAttrib(window, n, WGL_ACCUM_BLUE_BITS_ARB);
            u->accumAlphaBits = getPixelFormatAttrib(window, n, WGL_ACCUM_ALPHA_BITS_ARB);

            u->auxBuffers = getPixelFormatAttrib(window, n, WGL_AUX_BUFFERS_ARB);

            if (getPixelFormatAttrib(window, n, WGL_STEREO_ARB))
                u->stereo = GLFW_TRUE;
            if (getPixelFormatAttrib(window, n, WGL_DOUBLE_BUFFER_ARB))
                u->doublebuffer = GLFW_TRUE;

            if (_glfw.wgl.ARB_multisample)
                u->samples = getPixelFormatAttrib(window, n, WGL_SAMPLES_ARB);

            if (_glfw.wgl.ARB_framebuffer_sRGB ||
                _glfw.wgl.EXT_framebuffer_sRGB)
            {
                if (getPixelFormatAttrib(window, n, WGL_FRAMEBUFFER_SRGB_CAPABLE_ARB))
                    u->sRGB = GLFW_TRUE;
            }
        }
        else
        {
            PIXELFORMATDESCRIPTOR pfd;

            // Get pixel format attributes through legacy PFDs

            if (!DescribePixelFormat(window->context.wgl.dc,
                                     n,
                                     sizeof(PIXELFORMATDESCRIPTOR),
                                     &pfd))
            {
                continue;
            }

            if (!(pfd.dwFlags & PFD_DRAW_TO_WINDOW) ||
                !(pfd.dwFlags & PFD_SUPPORT_OPENGL))
            {
                continue;
            }

            if (!(pfd.dwFlags & PFD_GENERIC_ACCELERATED) &&
                (pfd.dwFlags & PFD_GENERIC_FORMAT))
            {
                continue;
            }

            if (pfd.iPixelType != PFD_TYPE_RGBA)
                continue;

            u->redBits = pfd.cRedBits;
            u->greenBits = pfd.cGreenBits;
            u->blueBits = pfd.cBlueBits;
            u->alphaBits = pfd.cAlphaBits;

            u->depthBits = pfd.cDepthBits;
            u->stencilBits = pfd.cStencilBits;

            u->accumRedBits = pfd.cAccumRedBits;
            u->accumGreenBits = pfd.cAccumGreenBits;
            u->accumBlueBits = pfd.cAccumBlueBits;
            u->accumAlphaBits = pfd.cAccumAlphaBits;

            u->auxBuffers = pfd.cAuxBuffers;

            if (pfd.dwFlags & PFD_STEREO)
                u->stereo = GLFW_TRUE;
            if (pfd.dwFlags & PFD_DOUBLEBUFFER)
                u->doublebuffer = GLFW_TRUE;
        }

        u->handle = n;
        usableCount++;
    }

    if (!usableCount)
    {
        _glfwInputError(GLFW_API_UNAVAILABLE,
                        "WGL: The driver does not appear to support OpenGL");

        free(usableConfigs);
        return GLFW_FALSE;
    }

    closest = _glfwChooseFBConfig(desired, usableConfigs, usableCount);
    if (!closest)
    {
        _glfwInputError(GLFW_FORMAT_UNAVAILABLE,
                        "WGL: Failed to find a suitable pixel format");

        free(usableConfigs);
        return GLFW_FALSE;
    }

    *result = (int) closest->handle;
    free(usableConfigs);

    return GLFW_TRUE;
}
Esempio n. 8
0
// Return a list of available and usable framebuffer configs
//
static GLFWbool chooseFBConfig(
	const _GLFWfbconfig* desired,
	GLXFBConfig* result,
	GLFWbool findTransparent)
{
    GLXFBConfig* nativeConfigs;
    _GLFWfbconfig* usableConfigs;
    const _GLFWfbconfig* closest;
    int i, nativeCount, usableCount;
    const char* vendor;
    GLFWbool trustWindowBit = GLFW_TRUE;

    if ( !(_glfw.xrender.major || _glfw.xrender.minor) ) {
        findTransparent = GLFW_FALSE;
    }

    // HACK: This is a (hopefully temporary) workaround for Chromium
    //       (VirtualBox GL) not setting the window bit on any GLXFBConfigs
    vendor = glXGetClientString(_glfw.x11.display, GLX_VENDOR);
    if (strcmp(vendor, "Chromium") == 0)
        trustWindowBit = GLFW_FALSE;

    nativeConfigs =
        glXGetFBConfigs(_glfw.x11.display, _glfw.x11.screen, &nativeCount);
    if (!nativeCount)
    {
        _glfwInputError(GLFW_API_UNAVAILABLE, "GLX: No GLXFBConfigs returned");
        return GLFW_FALSE;
    }

    usableConfigs = calloc(nativeCount, sizeof(_GLFWfbconfig));
    usableCount = 0;
    
selectionloop:
    for (i = 0;  i < nativeCount;  i++)
    {
        const GLXFBConfig n = nativeConfigs[i];
        _GLFWfbconfig* u = usableConfigs + usableCount;

        // Only consider RGBA GLXFBConfigs
        if (!(getFBConfigAttrib(n, GLX_RENDER_TYPE) & GLX_RGBA_BIT))
            continue;

        // Only consider window GLXFBConfigs
        if (!(getFBConfigAttrib(n, GLX_DRAWABLE_TYPE) & GLX_WINDOW_BIT))
        {
            if (trustWindowBit)
                continue;
        }

	if( findTransparent ) {
            XVisualInfo *visualinfo;
            XRenderPictFormat *pictFormat;

	    visualinfo = glXGetVisualFromFBConfig(_glfw.x11.display, n);
	    if (!visualinfo)
	        continue;

            pictFormat = XRenderFindVisualFormat(_glfw.x11.display, visualinfo->visual);
            if( !pictFormat ) {
	        XFree( visualinfo );
	        continue;
	    }

            if( !pictFormat->direct.alphaMask ) {
	        XFree( visualinfo );
	        continue;
	    }
	    XFree( visualinfo );
        }

        u->redBits = getFBConfigAttrib(n, GLX_RED_SIZE);
        u->greenBits = getFBConfigAttrib(n, GLX_GREEN_SIZE);
        u->blueBits = getFBConfigAttrib(n, GLX_BLUE_SIZE);

        u->alphaBits = getFBConfigAttrib(n, GLX_ALPHA_SIZE);
        u->depthBits = getFBConfigAttrib(n, GLX_DEPTH_SIZE);
        u->stencilBits = getFBConfigAttrib(n, GLX_STENCIL_SIZE);

        u->accumRedBits = getFBConfigAttrib(n, GLX_ACCUM_RED_SIZE);
        u->accumGreenBits = getFBConfigAttrib(n, GLX_ACCUM_GREEN_SIZE);
        u->accumBlueBits = getFBConfigAttrib(n, GLX_ACCUM_BLUE_SIZE);
        u->accumAlphaBits = getFBConfigAttrib(n, GLX_ACCUM_ALPHA_SIZE);

        u->auxBuffers = getFBConfigAttrib(n, GLX_AUX_BUFFERS);

        if (getFBConfigAttrib(n, GLX_STEREO))
            u->stereo = GLFW_TRUE;
        if (getFBConfigAttrib(n, GLX_DOUBLEBUFFER))
            u->doublebuffer = GLFW_TRUE;

        if (_glfw.glx.ARB_multisample)
            u->samples = getFBConfigAttrib(n, GLX_SAMPLES);

        if (_glfw.glx.ARB_framebuffer_sRGB || _glfw.glx.EXT_framebuffer_sRGB)
            u->sRGB = getFBConfigAttrib(n, GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB);

        u->glx = n;
        usableCount++;
    }
    // reiterate the selection loop without looking for transparency supporting
    // formats if no matchig FB configs for a transparent window were found. 
    if( findTransparent && !usableCount ) {
        findTransparent = GLFW_FALSE;
	goto selectionloop;
    }

    closest = _glfwChooseFBConfig(desired, usableConfigs, usableCount);
    if (closest)
        *result = closest->glx;

    XFree(nativeConfigs);
    free(usableConfigs);

    return closest ? GLFW_TRUE : GLFW_FALSE;
}