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[client] egl: use standard-compliant way of EGL detection

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According to the documentation for eglQueryString:

> EGL_BAD_DISPLAY is generated if display is not an EGL display connection,
> unless display is EGL_NO_DISPLAY and name is EGL_EXTENSIONS.

Therefore, we should check EGL by doing:

    eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS)

Indeed, the old way of eglQueryString(EGL_NO_DISPLAY, EGL_VERSION) works on
libglvnd but not using mesa's libEGL.so directly.

Also added a warning to make it more obvious that EGL is not available.
This commit is contained in:
Quantum
2021-08-15 18:16:09 -04:00
committed by Geoffrey McRae
parent 8a5efef622
commit b7d3bbbd82
1 changed files with 4 additions and 1 deletions
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5
client/renderers/EGL/egl.c
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@@ -201,8 +201,11 @@ static bool egl_create(LG_Renderer ** renderer, const LG_RendererParams params,
bool * needsOpenGL)
{
// check if EGL is even available
if (!eglQueryString(EGL_NO_DISPLAY, EGL_VERSION))
if (!eglQueryString(EGL_NO_DISPLAY, EGL_EXTENSIONS))
{
DEBUG_WARN("EGL is not available");
return false;
}
// create our local storage
struct Inst * this = calloc(1, sizeof(*this));