bool
WebGLProgram::LinkProgram()
{
mContext->InvalidateBufferFetching(); // we do it early in this function
// as some of the validation below changes program state
mLinkLog.Truncate();
mMostRecentLinkInfo = nullptr;
if (!mVertShader || !mVertShader->IsCompiled()) {
mLinkLog.AssignLiteral("Must have a compiled vertex shader attached.");
mContext->GenerateWarning("linkProgram: %s", mLinkLog.BeginReading());
return false;
}
if (!mFragShader || !mFragShader->IsCompiled()) {
mLinkLog.AssignLiteral("Must have an compiled fragment shader attached.");
mContext->GenerateWarning("linkProgram: %s", mLinkLog.BeginReading());
return false;
}
if (!mFragShader->CanLinkTo(mVertShader, &mLinkLog)) {
mContext->GenerateWarning("linkProgram: %s", mLinkLog.BeginReading());
return false;
}
gl::GLContext* gl = mContext->gl;
gl->MakeCurrent();
if (gl->WorkAroundDriverBugs() &&
mContext->mIsMesa)
{
// Bug 777028: Mesa can't handle more than 16 samplers per program,
// counting each array entry.
size_t numSamplerUniforms_upperBound = mVertShader->CalcNumSamplerUniforms() +
mFragShader->CalcNumSamplerUniforms();
if (numSamplerUniforms_upperBound > 16) {
mLinkLog.AssignLiteral("Programs with more than 16 samplers are disallowed on"
" Mesa drivers to avoid crashing.");
mContext->GenerateWarning("linkProgram: %s", mLinkLog.BeginReading());
return false;
}
// Bug 1203135: Mesa crashes internally if we exceed the reported maximum attribute count.
if (mVertShader->NumAttributes() > mContext->MaxVertexAttribs()) {
mLinkLog.AssignLiteral("Number of attributes exceeds Mesa's reported max attribute count.");
mContext->GenerateWarning("linkProgram: %s", mLinkLog.BeginReading());
return false;
}
}
// Bind the attrib locations.
// This can't be done trivially, because we have to deal with mapped attrib names.
for (auto itr = mBoundAttribLocs.begin(); itr != mBoundAttribLocs.end(); ++itr) {
const nsCString& name = itr->first;
GLuint index = itr->second;
mVertShader->BindAttribLocation(mGLName, name, index);
}
if (!mTransformFeedbackVaryings.empty()) {
// Bind the transform feedback varyings.
// This can't be done trivially, because we have to deal with mapped names too.
mVertShader->ApplyTransformFeedbackVaryings(mGLName,
mTransformFeedbackVaryings,
mTransformFeedbackBufferMode,
&mTempMappedVaryings);
}
if (LinkAndUpdate())
return true;
// Failed link.
if (mContext->ShouldGenerateWarnings()) {
// report shader/program infoLogs as warnings.
// note that shader compilation errors can be deferred to linkProgram,
// which is why we can't do anything in compileShader. In practice we could
// report in compileShader the translation errors generated by ANGLE,
// but it seems saner to keep a single way of obtaining shader infologs.
if (!mLinkLog.IsEmpty()) {
mContext->GenerateWarning("linkProgram: Failed to link, leaving the following"
" log:\n%s\n",
mLinkLog.BeginReading());
}
}
return false;
}
void
WebGLProgram::LinkProgram()
{
const char funcName[] = "linkProgram";
if (mNumActiveTFOs) {
mContext->ErrorInvalidOperation("%s: Program is in-use by one or more active"
" transform feedback objects.",
funcName);
return;
}
mContext->MakeContextCurrent();
mContext->InvalidateBufferFetching(); // we do it early in this function
// as some of the validation changes program state
mLinkLog.Truncate();
mMostRecentLinkInfo = nullptr;
if (!ValidateForLink()) {
mContext->GenerateWarning("%s: %s", funcName, mLinkLog.BeginReading());
return;
}
// Bind the attrib locations.
// This can't be done trivially, because we have to deal with mapped attrib names.
for (const auto& pair : mNextLink_BoundAttribLocs) {
const auto& name = pair.first;
const auto& index = pair.second;
mVertShader->BindAttribLocation(mGLName, name, index);
}
// Storage for transform feedback varyings before link.
// (Work around for bug seen on nVidia drivers.)
std::vector<std::string> scopedMappedTFVaryings;
if (mContext->IsWebGL2()) {
mVertShader->MapTransformFeedbackVaryings(mNextLink_TransformFeedbackVaryings,
&scopedMappedTFVaryings);
std::vector<const char*> driverVaryings;
driverVaryings.reserve(scopedMappedTFVaryings.size());
for (const auto& cur : scopedMappedTFVaryings) {
driverVaryings.push_back(cur.c_str());
}
mContext->gl->fTransformFeedbackVaryings(mGLName, driverVaryings.size(),
driverVaryings.data(),
mNextLink_TransformFeedbackBufferMode);
}
LinkAndUpdate();
if (mMostRecentLinkInfo) {
nsCString postLinkLog;
if (ValidateAfterTentativeLink(&postLinkLog))
return;
mMostRecentLinkInfo = nullptr;
mLinkLog = postLinkLog;
}
// Failed link.
if (mContext->ShouldGenerateWarnings()) {
// report shader/program infoLogs as warnings.
// note that shader compilation errors can be deferred to linkProgram,
// which is why we can't do anything in compileShader. In practice we could
// report in compileShader the translation errors generated by ANGLE,
// but it seems saner to keep a single way of obtaining shader infologs.
if (!mLinkLog.IsEmpty()) {
mContext->GenerateWarning("linkProgram: Failed to link, leaving the following"
" log:\n%s\n",
mLinkLog.BeginReading());
}
}
}