bool
WebGLContext::InitWebGL2()
{
MOZ_ASSERT(IsWebGL2(), "WebGLContext is not a WebGL 2 context!");
// check OpenGL features
if (!gl->IsSupported(gl::GLFeature::occlusion_query) &&
!gl->IsSupported(gl::GLFeature::occlusion_query_boolean))
{
// On desktop, we fake occlusion_query_boolean with occlusion_query if
// necessary. (See WebGL2ContextQueries.cpp)
GenerateWarning("WebGL 2 unavailable. Requires occlusion queries.");
return false;
}
std::vector<gl::GLFeature> missingList;
for (size_t i = 0; i < ArrayLength(kRequiredFeatures); i++) {
if (!gl->IsSupported(kRequiredFeatures[i]))
missingList.push_back(kRequiredFeatures[i]);
}
if (missingList.size()) {
nsAutoCString exts;
for (auto itr = missingList.begin(); itr != missingList.end(); ++itr) {
exts.AppendLiteral("\n ");
exts.Append(gl::GLContext::GetFeatureName(*itr));
}
GenerateWarning("WebGL 2 unavailable. The following required features are"
" unavailible: %s", exts.BeginReading());
return false;
}
// ok WebGL 2 is compatible, we can enable natively supported extensions.
for (size_t i = 0; i < ArrayLength(kNativelySupportedExtensions); i++) {
EnableExtension(kNativelySupportedExtensions[i]);
MOZ_ASSERT(IsExtensionEnabled(kNativelySupportedExtensions[i]));
}
// we initialise WebGL 2 related stuff.
gl->GetUIntegerv(LOCAL_GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS,
&mGLMaxTransformFeedbackSeparateAttribs);
gl->GetUIntegerv(LOCAL_GL_MAX_UNIFORM_BUFFER_BINDINGS,
&mGLMaxUniformBufferBindings);
mBoundTransformFeedbackBuffers.SetLength(mGLMaxTransformFeedbackSeparateAttribs);
mBoundUniformBuffers.SetLength(mGLMaxUniformBufferBindings);
mDefaultTransformFeedback = new WebGLTransformFeedback(this, 0);
mBoundTransformFeedback = mDefaultTransformFeedback;
mBypassShaderValidation = true;
return true;
}
WebGLExtensionBase*
WebGLContext::EnableSupportedExtension(JSContext* js, WebGLExtensionID ext)
{
if (!IsExtensionEnabled(ext)) {
if (!IsExtensionSupported(js, ext))
return nullptr;
EnableExtension(ext);
}
return mExtensions[ext];
}
WebGLExtensionBase*
WebGLContext::EnableSupportedExtension(dom::CallerType callerType,
WebGLExtensionID ext)
{
if (!IsExtensionEnabled(ext)) {
if (!IsExtensionSupported(callerType, ext))
return nullptr;
EnableExtension(ext);
}
return mExtensions[ext];
}
