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glgsg: Guess max vertex attrib stride if not queryable

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Or should we just assume the most restrictive possibility?
This commit is contained in:
rdb 2023-02-03 15:09:32 +01:00
parent b09a8a84ec
commit 805fa5a36a
1 changed files with 16 additions and 4 deletions
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20
panda/src/glstuff/glGraphicsStateGuardian_src.cxx
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@ -3523,27 +3523,39 @@ reset() {
#endif
#ifndef OPENGLES_1
_max_vertex_attrib_stride = -1;
#ifdef OPENGLES
if (is_at_least_gles_version(3, 1))
#else
if (is_at_least_gl_version(4, 4))
#endif
{
_max_vertex_attrib_stride = -1;
glGetIntegerv(GL_MAX_VERTEX_ATTRIB_STRIDE, &_max_vertex_attrib_stride);
if (_max_vertex_attrib_stride < 0) {
GLCAT.warning()
<< "Failed to query GL_MAX_VERTEX_ATTRIB_STRIDE.\n";
_max_vertex_attrib_stride = INT_MAX;
}
else if (GLCAT.is_debug()) {
GLCAT.debug()
<< "max vertex attrib stride = " << _max_vertex_attrib_stride << "\n";
}
}
else {
_max_vertex_attrib_stride = INT_MAX;
if (_max_vertex_attrib_stride < 0) {
// OpenGL doesn't specify a maximum before version 4.4 / ES 3.1, but
// drivers really do have one. Make an educated guess.
#ifdef OPENGLES
_max_vertex_attrib_stride = (_gl_vendor == "Qualcomm") ? INT_MAX : 2048;
#elif defined(_WIN32)
_max_vertex_attrib_stride = (_gl_vendor == "Intel") ? 4095 : 2048;
#else
_max_vertex_attrib_stride = 2048;
#endif
if (GLCAT.is_debug()) {
GLCAT.debug()
<< "max vertex attrib stride = " << _max_vertex_attrib_stride
<< " (guessed)\n";
}
}
#endif // !OPENGLES_1